Chinh sua UI

QuizMaster/.vs/QuizMaster/v17/DocumentLayout.json

@@ -6,29 +6,45 @@
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     },
+    {
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+      "RelativeMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|solutionrelative:form1.designer.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
+    },
     {
       "AbsoluteMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|e:\\quizmaster\\quizmaster\\form2.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
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+      "AbsoluteMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|e:\\quizmaster\\quizmaster\\response\\quiz.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
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+      "RelativeMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|solutionrelative:response\\quiz.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
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+    {
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+    },
+    {
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+      "RelativeMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|solutionrelative:service\\executeexcelservice.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
+    },
+    {
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+    },
+    {
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+      "RelativeMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|solutionrelative:dbhelper.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
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       "AbsoluteMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|e:\\quizmaster\\quizmaster\\service\\datautil.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
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+      "AbsoluteMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|e:\\quizmaster\\quizmaster\\service\\excelvalidator.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
-      "RelativeMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|solutionrelative:form1.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}|Form"
+      "RelativeMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|solutionrelative:service\\excelvalidator.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
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     {
       "AbsoluteMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|e:\\quizmaster\\quizmaster\\form2.designer.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
       "RelativeMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|solutionrelative:form2.designer.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
-    },
-    {
-      "AbsoluteMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|e:\\quizmaster\\quizmaster\\dbhelper.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
-      "RelativeMoniker": "D:0:0:{582DBFA6-720D-44B4-B48C-909F4DD98783}|QuizMaster.csproj|solutionrelative:dbhelper.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
     }
   ],
   "DocumentGroupContainers": [
@@ -48,7 +64,7 @@
               "RelativeDocumentMoniker": "Form1.cs",
               "ToolTip": "E:\\QuizMaster\\QuizMaster\\Form1.cs",
               "RelativeToolTip": "Form1.cs",
-              "ViewState": "AQIAAAYEAAAAAAAAAAAcwBEEAAApAAAA",
+              "ViewState": "AQIAAE8AAAAAAAAAAAAuwGUAAABVAAAA",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-05-26T01:54:54.164Z",
               "IsPinned": true,
@@ -56,28 +72,16 @@
             },
             {
               "$type": "Document",
-              "DocumentIndex": 1,
+              "DocumentIndex": 2,
               "Title": "Form2.cs",
               "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Form2.cs",
               "RelativeDocumentMoniker": "Form2.cs",
               "ToolTip": "E:\\QuizMaster\\QuizMaster\\Form2.cs",
               "RelativeToolTip": "Form2.cs",
-              "ViewState": "AQIAAGMAAAAAAAAAAAAAAGwAAAAxAAAA",
+              "ViewState": "AQIAAF0AAAAAAAAAAAAIwG8AAAAUAAAA",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-10-02T06:28:48.666Z",
-              "IsPinned": true,
+              "IsPinned": true
-              "EditorCaption": ""
-            },
-            {
-              "$type": "Document",
-              "DocumentIndex": 4,
-              "Title": "Form1.cs [Design]",
-              "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Form1.cs",
-              "RelativeDocumentMoniker": "Form1.cs",
-              "ToolTip": "E:\\QuizMaster\\QuizMaster\\Form1.cs [Design]",
-              "RelativeToolTip": "Form1.cs [Design]",
-              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
-              "WhenOpened": "2025-10-08T02:47:37.753Z"
             },
             {
               "$type": "Bookmark",
@@ -95,52 +99,111 @@
               "$type": "Bookmark",
               "Name": "ST:17:0:{e8034f19-ab72-4f06-83fd-f6832b41aa63}"
             },
+            {
+              "$type": "Document",
+              "DocumentIndex": 6,
+              "Title": "Question.cs",
+              "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Response\\Question.cs",
+              "RelativeDocumentMoniker": "Response\\Question.cs",
+              "ToolTip": "E:\\QuizMaster\\QuizMaster\\Response\\Question.cs",
+              "RelativeToolTip": "Response\\Question.cs",
+              "ViewState": "AQIAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-10-14T06:24:38.262Z"
+            },
             {
               "$type": "Document",
               "DocumentIndex": 3,
+              "Title": "Quiz.cs",
+              "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Response\\Quiz.cs",
+              "RelativeDocumentMoniker": "Response\\Quiz.cs",
+              "ToolTip": "E:\\QuizMaster\\QuizMaster\\Response\\Quiz.cs",
+              "RelativeToolTip": "Response\\Quiz.cs",
+              "ViewState": "AQIAAAAAAAAAAAAAAAAAAA0AAAAWAAAA",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-10-13T08:59:40.254Z"
+            },
+            {
+              "$type": "Document",
+              "DocumentIndex": 5,
+              "Title": "ExecuteExcelService.cs",
+              "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Service\\ExecuteExcelService.cs",
+              "RelativeDocumentMoniker": "Service\\ExecuteExcelService.cs",
+              "ToolTip": "E:\\QuizMaster\\QuizMaster\\Service\\ExecuteExcelService.cs",
+              "RelativeToolTip": "Service\\ExecuteExcelService.cs",
+              "ViewState": "AQIAAA8AAAAAAAAAAAAAADAAAAAAAAAA",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-10-13T03:41:10.651Z"
+            },
+            {
+              "$type": "Document",
+              "DocumentIndex": 4,
+              "Title": "QuestionOption.cs",
+              "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Response\\QuestionOption.cs",
+              "RelativeDocumentMoniker": "Response\\QuestionOption.cs",
+              "ToolTip": "E:\\QuizMaster\\QuizMaster\\Response\\QuestionOption.cs",
+              "RelativeToolTip": "Response\\QuestionOption.cs",
+              "ViewState": "AQIAAAAAAAAAAAAAAAAAAAYAAAAWAAAA",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-10-10T06:59:55.277Z"
+            },
+            {
+              "$type": "Document",
+              "DocumentIndex": 9,
+              "Title": "ExcelValidator.cs",
+              "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Service\\ExcelValidator.cs",
+              "RelativeDocumentMoniker": "Service\\ExcelValidator.cs",
+              "ToolTip": "E:\\QuizMaster\\QuizMaster\\Service\\ExcelValidator.cs",
+              "RelativeToolTip": "Service\\ExcelValidator.cs",
+              "ViewState": "AQIAAFcAAAAAAAAAAAAQwEwAAAAJAAAA",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-10-10T03:12:07.301Z"
+            },
+            {
+              "$type": "Document",
+              "DocumentIndex": 8,
               "Title": "DataUtil.cs",
               "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Service\\DataUtil.cs",
               "RelativeDocumentMoniker": "Service\\DataUtil.cs",
               "ToolTip": "E:\\QuizMaster\\QuizMaster\\Service\\DataUtil.cs",
               "RelativeToolTip": "Service\\DataUtil.cs",
-              "ViewState": "AQIAABsBAAAAAAAAAAAwwEABAAAAAAAA",
+              "ViewState": "AQIAAAAAAAAAAAAAAAAAABEAAAAJAAAA",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-05-29T01:45:12.308Z"
             },
             {
               "$type": "Document",
-              "DocumentIndex": 2,
+              "DocumentIndex": 1,
               "Title": "Form1.Designer.cs",
               "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Form1.Designer.cs",
               "RelativeDocumentMoniker": "Form1.Designer.cs",
               "ToolTip": "E:\\QuizMaster\\QuizMaster\\Form1.Designer.cs",
               "RelativeToolTip": "Form1.Designer.cs",
-              "ViewState": "AQIAABoBAAAAAAAAAAAYwCcBAAAwAAAA",
+              "ViewState": "AQIAAE8AAAAAAAAAAAAuwGUAAAAxAAAA",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
-              "WhenOpened": "2025-09-30T04:14:48.709Z",
+              "WhenOpened": "2025-09-30T04:14:48.709Z"
-              "EditorCaption": ""
             },
             {
               "$type": "Document",
-              "DocumentIndex": 5,
+              "DocumentIndex": 10,
               "Title": "Form2.Designer.cs",
               "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\Form2.Designer.cs",
               "RelativeDocumentMoniker": "Form2.Designer.cs",
               "ToolTip": "E:\\QuizMaster\\QuizMaster\\Form2.Designer.cs",
               "RelativeToolTip": "Form2.Designer.cs",
-              "ViewState": "AQIAAAAAAAAAAAAAAAAAACcAAAAbAAAA",
+              "ViewState": "AQIAAAAAAAAAAAAAAAAAADYAAAAgAAAA",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-10-02T06:23:49.946Z"
             },
             {
               "$type": "Document",
-              "DocumentIndex": 6,
+              "DocumentIndex": 7,
               "Title": "DbHelper.cs",
               "DocumentMoniker": "E:\\QuizMaster\\QuizMaster\\DbHelper.cs",
               "RelativeDocumentMoniker": "DbHelper.cs",
               "ToolTip": "E:\\QuizMaster\\QuizMaster\\DbHelper.cs",
               "RelativeToolTip": "DbHelper.cs",
-              "ViewState": "AQIAADAAAAAAAAAAAAAYwBIAAAAPAAAA",
+              "ViewState": "AQIAADYAAAAAAAAAAAAYwBIAAAAPAAAA",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-05-26T01:35:21.294Z"
             }

QuizMaster/Form1.Designer.cs

@@ -98,8 +98,8 @@
             panelcb.BorderStyle = BorderStyle.FixedSingle;
             panelcb.Location = new Point(50, 50);
             panelcb.Name = "panelcb";
-            panelcb.Size = new Size(600, 300);
+            panelcb.Size = new Size(770, 200);
-            panelcb.MaximumSize = new Size(600, 300);
+            panelcb.MaximumSize = new Size(770, 400);
             panelcb.TabIndex = 1;
             panelcb.AutoScroll = true;
             panelcb.AutoSize = true;
@@ -113,8 +113,8 @@
             panelop.Controls.Add(lblNumberOfCopies);
             panelop.Controls.Add(txtNumberOfCopies);
             panelop.Name = "panelop";
-            panelop.Size = new Size(600, 100);
+            panelop.Size = new Size(770, 100);
-            panelop.MaximumSize = new Size(600, 300);
+            panelop.MaximumSize = new Size(770, 300);
             panelop.TabIndex = 2;
             panelop.AutoScroll = true;
             panelop.AutoSize = true;

QuizMaster/Form2.Designer.cs

@@ -35,6 +35,7 @@
             this.txtResult.Location = new System.Drawing.Point(0, 0);
             this.txtResult.Name = "txtResult";
             this.txtResult.Size = new System.Drawing.Size(800, 450);
+            this.txtResult.WordWrap = true;
             this.txtResult.TabIndex = 0;
             //
             //btnExoortWord
@@ -49,8 +50,8 @@
             this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(800, 450);
-            this.Controls.Add(this.txtResult);
             this.Controls.Add(this.btnExportWord);
+            this.Controls.Add(this.txtResult);
             this.Name = "Form2";
             this.Text = "Kết quả Generate";
             this.ResumeLayout(false);

QuizMaster/Form2.cs

@@ -4,7 +4,6 @@ using System.Windows.Forms;
 using Xceed.Words.NET;
 using Xceed.Document.NET; 
 
-
 namespace QuizMaster
 {
     public partial class Form2 : Form
@@ -16,7 +15,7 @@ namespace QuizMaster
         {
             InitializeComponent();
             _content = content;
-            txtResult.Text = content;
+            txtResult.Text = _content.Replace("\n", Environment.NewLine);
         }
 
         private void btnExportWord_Click(object sender, EventArgs e)

QuizMaster/Response/QuestionOption.cs

@@ -6,5 +6,7 @@
         public string Question { get; set; }
         public string Option { get; set; }
         public int IsCorrect { get; set; } // 1 = đúng, 0 = sai
+        public string DoKho { get; set; }
+
     }
 }

QuizMaster/Response/Quiz.cs

@@ -10,6 +10,7 @@ namespace QuizMaster.Response
         public string? B { get; set; }
         public string? C { get; set; }
         public string? D { get; set; }
-        public required string DapAn { get; set; }
+        public required List<string> DapAn { get; set; } = new List<string>();
+        public string DoKho {  get; set; }
     }
 }

QuizMaster/Service/DataUtil.cs

@@ -21,7 +21,7 @@ namespace QuizMaster.Service
 
             // 1. Kiểm tra xem câu hỏi đã tồn tại chưa
             var questionIdCmd = new NpgsqlCommand(@"
-            SELECT id FROM question WHERE content = @content AND category_id = @category_id;
+                SELECT id FROM question WHERE content = @content AND category_id = @category_id;
             ", conn);
 
             questionIdCmd.Parameters.AddWithValue("content", questionContent);
@@ -42,9 +42,9 @@ namespace QuizMaster.Service
             try
             {
                 var cmd = new NpgsqlCommand(@"
-                SELECT name 
+                    SELECT name 
-                FROM category 
+                    FROM category 
-                ORDER BY name;
+                    ORDER BY name;
                 ", conn);
 
                 await using var reader = await cmd.ExecuteReaderAsync();
@@ -75,11 +75,11 @@ namespace QuizMaster.Service
             try
             {
                 var cmd = new NpgsqlCommand(@"
-                SELECT c.name 
+                    SELECT c.name 
-                FROM category c
+                    FROM category c
-                INNER JOIN department d ON c.department_id = d.id
+                    INNER JOIN department d ON c.department_id = d.id
-                WHERE d.name = @departmentName
+                    WHERE d.name = @departmentName
-                ORDER BY c.name;
+                    ORDER BY c.name;
                 ", conn);
 
                 cmd.Parameters.AddWithValue("departmentName", departmentName);
@@ -103,6 +103,48 @@ namespace QuizMaster.Service
             return categories;
         }
 
+        public static async Task<List<CategoryInfo>> GetTotalOptionQuestionsAsync(List<string> lstCategory, string DoKho)
+        {
+            var categories = new List<CategoryInfo>();
+            if (lstCategory == null || lstCategory.Count == 0)
+            {
+                return categories;
+            }
+            string whereCate = string.Join(",", lstCategory.Select(c => $"'{c.Replace("'", "''")}'"));
+            await using var conn = new NpgsqlConnection(DbHelper.connectionString);
+            await conn.OpenAsync();
+
+            try
+            {
+                var cmd = new NpgsqlCommand($@"
+                    SELECT c.name, COUNT(q.id) AS Total
+                    FROM question q
+                    INNER JOIN category c ON q.category_id = c.id
+                    WHERE c.name IN ({whereCate})
+                    AND q.level = '{DoKho}'
+                    GROUP BY c.name
+                    ORDER BY c.name;
+                ", conn);
+
+                await using var reader = await cmd.ExecuteReaderAsync();
+                while (await reader.ReadAsync())
+                {
+                    categories.Add(new CategoryInfo
+                    {
+                        Category = reader.GetString(0),
+                        Total = reader.GetInt32(1)
+                    });
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"Lỗi khi lấy danh sách số câu khó: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                throw;
+            }
+
+            return categories;
+        }
+
         public static async Task<List<CategoryInfo>> GetTotalCategoriesAsync(List<string> lstCategory)
         {
             var categories = new List<CategoryInfo>();
@@ -117,12 +159,12 @@ namespace QuizMaster.Service
             try
             {
                 var cmd = new NpgsqlCommand($@"
-                SELECT c.name, COUNT(q.id) AS Total
+                    SELECT c.name, COUNT(q.id) AS Total
-                FROM question q
+                    FROM question q
-                INNER JOIN category c ON q.category_id = c.id
+                    INNER JOIN category c ON q.category_id = c.id
-                WHERE c.name IN ({whereCate})
+                    WHERE c.name IN ({whereCate})
-                GROUP BY c.name
+                    GROUP BY c.name
-                ORDER BY c.name;
+                    ORDER BY c.name;
                 ", conn);
 
                 await using var reader = await cmd.ExecuteReaderAsync();
@@ -144,7 +186,6 @@ namespace QuizMaster.Service
             return categories;
         }
 
-
         public static async Task<List<QuestionOption>> getAllQA(string Category)
         {
             var questionOption = new List<QuestionOption>();
@@ -154,13 +195,12 @@ namespace QuizMaster.Service
 
             try
             {
-                var cmd = new NpgsqlCommand(@"
+                var cmd = new NpgsqlCommand(@"SELECT q.id, q.content, q.level, o.option_text, o.is_correct
-                SELECT q.id, q.content, o.option_text, o.is_correct
+                    FROM question q
-                FROM question q
+                    INNER JOIN question_option o ON o.question_id = q.id
-                INNER JOIN question_option o ON o.question_id = q.id
+                    INNER JOIN category c ON q.category_id = c.id
-                INNER JOIN category c ON q.category_id = c.id
+                    WHERE c.name = @category
-                WHERE c.name = @category
+                    ORDER BY q.id, o.id
-                ORDER BY q.id, o.id;
                 ", conn);
 
                 cmd.Parameters.AddWithValue("category", Category);
@@ -170,10 +210,11 @@ namespace QuizMaster.Service
                 {
                     questionOption.Add(new QuestionOption
                     {
-                        QuestionId = reader.IsDBNull(0) ? 0 : reader.GetInt32(0),
+                        QuestionId = reader.GetInt32(0),
-                        Question = reader.IsDBNull(1) ? string.Empty : reader.GetString(1),
+                        Question = reader.GetString(1),
-                        Option = reader.IsDBNull(2) ? string.Empty : reader.GetString(2),
+                        DoKho = reader.IsDBNull(2) ? "" : reader.GetString(2),
-                        IsCorrect = reader.IsDBNull(3) ? 0 : reader.GetInt32(3)
+                        Option = reader.IsDBNull(3) ? string.Empty : reader.GetString(3),
+                        IsCorrect = reader.IsDBNull(4) ? 0 : reader.GetInt32(4)
                     });
                 }
             }
@@ -186,37 +227,78 @@ namespace QuizMaster.Service
             return questionOption;
         }
 
+
         public static async Task<bool> InsertQuestionAndOptionsAsync(List<Quiz> questions)
         {
+            if (questions == null || questions.Count == 0)
+                return false;
+
             await using var conn = new NpgsqlConnection(DbHelper.connectionString);
             await conn.OpenAsync();
             await using var transaction = await conn.BeginTransactionAsync();
 
             try
             {
+                // --- 1. Cache categoryId ---
+                var categoryCache = new Dictionary<string, int>();
                 foreach (var q in questions)
                 {
-                    // Lấy category_id
+                    if (!categoryCache.ContainsKey(q.LinhVuc))
-                    var cmdCategory = new NpgsqlCommand("SELECT id FROM category WHERE name = @name", conn, transaction);
+                    {
-                    cmdCategory.Parameters.AddWithValue("name", q.LinhVuc);
+                        var cmdCategory = new NpgsqlCommand(
-                    var categoryIdObj = await cmdCategory.ExecuteScalarAsync();
+                            "SELECT id FROM category WHERE name = @name", conn, transaction);
-                    if (categoryIdObj == null)
+                        cmdCategory.Parameters.AddWithValue("name", q.LinhVuc);
-                        throw new Exception($"Category '{q.LinhVuc}' không tồn tại.");
+                        var categoryIdObj = await cmdCategory.ExecuteScalarAsync();
+                        if (categoryIdObj == null)
+                            throw new Exception($"Category '{q.LinhVuc}' không tồn tại.");
+                        categoryCache[q.LinhVuc] = (int)categoryIdObj;
+                    }
+                }
 
-                    int categoryId = (int)categoryIdObj;
+                // --- 2. Batch insert questions ---
+                var batchQuestions = new NpgsqlBatch(conn, transaction);
+                foreach (var q in questions)
+                {
+                    var cmd = new NpgsqlBatchCommand(@"
+                        INSERT INTO question (content, category_id, level)
+                        VALUES (@content, @categoryId, @level)
+                        RETURNING id;
+                    ");
+                    cmd.Parameters.AddWithValue("content", q.CauHoi);
+                    cmd.Parameters.AddWithValue("categoryId", categoryCache[q.LinhVuc]);
+                    cmd.Parameters.AddWithValue("level", q.DoKho);
+                    batchQuestions.BatchCommands.Add(cmd);
+                }
 
-                    // Insert Question
+                // --- 3. Execute batch question và lấy questionId ---
-                    var cmdQuestion = new NpgsqlCommand(@"
+                var questionIds = new List<int>();
-                    INSERT INTO question (content, category_id)
+                await using (var reader = await batchQuestions.ExecuteReaderAsync())
-                    VALUES (@content, @categoryId)
+                {
-                    RETURNING id;
+                    foreach (var _ in questions)
-                    ", conn, transaction);
+                    {
-                    cmdQuestion.Parameters.AddWithValue("content", q.CauHoi);
+                        if (!await reader.ReadAsync())
-                    cmdQuestion.Parameters.AddWithValue("categoryId", categoryId);
+                            throw new Exception("Không lấy đủ questionId từ batch.");
+                        questionIds.Add(reader.GetInt32(0));
+
+                        // Chuyển sang result set tiếp theo (mỗi INSERT RETURNING tạo 1 result set)
+                        await reader.NextResultAsync();
+                    }
+                }
+
+                // --- 4. Batch insert options ---
+                var batchOptions = new NpgsqlBatch(conn, transaction);
+                for (int i = 0; i < questions.Count; i++)
+                {
+                    var q = questions[i];
+                    var qid = questionIds[i];
+
+                    if (q.DapAn == null || q.DapAn.Count == 0 || q.DapAn.Any(a => !"ABCD".Contains(a)))
+                    {
+                        var dapAnStr = q.DapAn != null ? string.Join(",", q.DapAn) : "(null)";
+                        throw new Exception($"Câu hỏi '{q.CauHoi}' có đáp án không hợp lệ: {dapAnStr}");
+                    }
 
-                    int questionId = (int)await cmdQuestion.ExecuteScalarAsync();
 
-                    // Insert QuestionOption
                     var options = new Dictionary<string, string?>
                     {
                         { "A", q.A },
@@ -227,19 +309,20 @@ namespace QuizMaster.Service
 
                     foreach (var opt in options)
                     {
-                        var cmdOption = new NpgsqlCommand(@"
+                        var cmdOption = new NpgsqlBatchCommand(@"
-                        INSERT INTO question_option (question_id, option_text, is_correct)
+                            INSERT INTO question_option (question_id, option_text, is_correct)
-                        VALUES (@questionId, @optionText, @isCorrect);
+                            VALUES (@questionId, @optionText, @isCorrect);
-                        ", conn, transaction);
+                        ");
-
+                        cmdOption.Parameters.AddWithValue("questionId", qid);
-                        cmdOption.Parameters.AddWithValue("questionId", questionId);
                         cmdOption.Parameters.AddWithValue("optionText", opt.Value ?? (object)DBNull.Value);
-                        cmdOption.Parameters.AddWithValue("isCorrect", opt.Key == q.DapAn ? 1 : 0);
+                        cmdOption.Parameters.AddWithValue("isCorrect", q.DapAn.Contains(opt.Key) ? 1 : 0);
-
+                        batchOptions.BatchCommands.Add(cmdOption);
-                        await cmdOption.ExecuteNonQueryAsync();
                     }
                 }
 
+                // --- 5. Execute batch options ---
+                await batchOptions.ExecuteNonQueryAsync();
+
                 await transaction.CommitAsync();
                 return true;
             }
@@ -250,6 +333,7 @@ namespace QuizMaster.Service
             }
         }
 
+
         public static async Task<int> GetTotalQuestionCount()
         {
             string query = "SELECT COUNT(*) FROM Question";
@@ -267,26 +351,6 @@ namespace QuizMaster.Service
             return Convert.ToInt32(result);
         }
 
-        //public static async Task<List<Question>> GetRandomQuestions(int requestedCount)
-        //{
-        //    int totalCount = await GetTotalQuestionCount();
-
-        //    if (requestedCount <= 0)
-        //    {
-        //        MessageBox.Show("Vui lòng nhập số lượng lớn hơn 0.", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Warning);
-        //        return new List<Question>();
-        //    }
-
-        //    if (requestedCount > totalCount)
-        //    {
-        //        MessageBox.Show($"Chỉ có {totalCount} câu hỏi trong cơ sở dữ liệu.", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Warning);
-        //        return new List<Question>();
-        //    }
-
-        //    string query = $"SELECT * FROM Question ORDER BY RANDOM() LIMIT {requestedCount}";
-        //    return await DbHelper.ExecuteSelectQuery<Question>(query);
-        //}
-
         public static async Task<List<string>> GetDepartmentsAsync()
         {
             List<string> deplist = new List<string>();
@@ -316,5 +380,6 @@ namespace QuizMaster.Service
             return deplist;
         }
 
+        
     }
 }

QuizMaster/Service/ExcelValidator.cs

@@ -2,8 +2,10 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using OfficeOpenXml;
+using Xceed.Document.NET;
 
 namespace QuizMaster.Service
 {
@@ -11,7 +13,7 @@ namespace QuizMaster.Service
     {
         private static readonly List<string> ExpectedHeaders = new()
     {
-        "Lĩnh vực", "Câu hỏi", "A", "B", "C", "D", "Đáp án"
+        "Lĩnh vực", "Câu hỏi", "A", "B", "C", "D", "Đáp án", "Độ khó"
     };
 
         public sealed class RowData
@@ -23,11 +25,14 @@ namespace QuizMaster.Service
             public string B { get; init; } = string.Empty;
             public string C { get; init; } = string.Empty;
             public string D { get; init; } = string.Empty;
-            public string Answer { get; init; } = string.Empty;
+            public List<string> Answers { get; init; } = new List<string>();
+            public string Level  { get; init; } = string.Empty;
+
+
         }
 
 
-        public static List<string> ValidateHeaders(OfficeOpenXml.ExcelWorksheet worksheet)
+    public static List<string> ValidateHeaders(OfficeOpenXml.ExcelWorksheet worksheet)
         {
             var errors = new List<string>();
             for (int i = 0; i < ExpectedHeaders.Count; i++)
@@ -50,6 +55,9 @@ namespace QuizMaster.Service
             if (string.IsNullOrWhiteSpace(data.Question))
                 errors.Add($"Dòng {data.Row}: 'Câu hỏi' không được trống");
 
+            if (string.IsNullOrWhiteSpace(data.Level))
+                errors.Add($"Dòng {data.Row}: 'Độ khó' không được trống");
+
             return errors;
         }
 
@@ -71,31 +79,40 @@ namespace QuizMaster.Service
         public static List<string> ValidateRowAnswer(RowData data)
         {
             var errors = new List<string>();
-            if (string.IsNullOrWhiteSpace(data.Answer))
+
+            if (data.Answers == null || data.Answers.Count == 0)
             {
                 errors.Add($"Dòng {data.Row}: 'Đáp án' không được trống");
                 return errors;
             }
 
-            var valid = new[] { "A", "B", "C", "D" };
+            var validOptions = new HashSet<string> { "A", "B", "C", "D" };
-            if (!valid.Contains(data.Answer))
-            {
-                errors.Add($"Dòng {data.Row}: 'Đáp án' phải là A, B, C hoặc D (hiện tại là '{data.Answer}')");
-                return errors;
-            }
 
-            bool answerPointsToEmpty = (data.Answer == "A" && string.IsNullOrWhiteSpace(data.A)) ||
+            foreach (var ans in data.Answers)
-                                       (data.Answer == "B" && string.IsNullOrWhiteSpace(data.B)) ||
-                                       (data.Answer == "C" && string.IsNullOrWhiteSpace(data.C)) ||
-                                       (data.Answer == "D" && string.IsNullOrWhiteSpace(data.D));
-            if (answerPointsToEmpty)
             {
-                errors.Add($"Dòng {data.Row}: 'Đáp án' {data.Answer} không hợp lệ vì phương án {data.Answer} đang trống");
+                if (!validOptions.Contains(ans))
+                {
+                    errors.Add($"Dòng {data.Row}: 'Đáp án' phải là A, B, C hoặc D (phát hiện '{ans}')");
+                    continue;
+                }
+
+                bool isEmptyOption =
+                    (ans == "A" && string.IsNullOrWhiteSpace(data.A)) ||
+                    (ans == "B" && string.IsNullOrWhiteSpace(data.B)) ||
+                    (ans == "C" && string.IsNullOrWhiteSpace(data.C)) ||
+                    (ans == "D" && string.IsNullOrWhiteSpace(data.D));
+
+                if (isEmptyOption)
+                {
+                    errors.Add($"Dòng {data.Row}: 'Đáp án' {ans} không hợp lệ vì phương án {ans} đang trống");
+                }
             }
 
             return errors;
         }
 
+        //________________________________________________________________________________________________
+
         public static List<string> ValidateRowDuplicate(RowData data, Dictionary<string, int> questionOptionDict)
         {
             var errors = new List<string>();
@@ -134,6 +151,12 @@ namespace QuizMaster.Service
                 var firstCell = worksheet.Cells[row, 1];
                 if (string.IsNullOrWhiteSpace(firstCell.Text)) break; // Dòng trống → kết thúc
 
+                var answerText = worksheet.Cells[row, 7].Text.Trim().ToUpper();
+                var answers = Regex.Matches(answerText.ToUpper(), "[ABCD]")
+                   .Select(m => m.Value.Trim())
+                   .Distinct()
+                   .ToList();
+
                 var data = new RowData
                 {
                     Row = row,
@@ -143,7 +166,8 @@ namespace QuizMaster.Service
                     B = worksheet.Cells[row, 4].Text.Trim(),
                     C = worksheet.Cells[row, 5].Text.Trim(),
                     D = worksheet.Cells[row, 6].Text.Trim(),
-                    Answer = worksheet.Cells[row, 7].Text.Trim().ToUpper()
+                    Answers = answers,
+                    Level = worksheet.Cells[row, 8].Text.Trim()
                 };
 
                 errors.AddRange(ValidateRowRequired(data));

QuizMaster/Service/ExecuteExcelService.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using OfficeOpenXml;
 using QuizMaster.Response;
@@ -21,6 +22,8 @@ namespace QuizMaster.Service
 
                 for (int row = 2; row <= rowCount; row++) // Bắt đầu từ dòng 2, bỏ dòng tiêu đề
                 {
+                    var answerText = worksheet.Cells[row, 7].Text.Trim().ToUpper();
+
                     var ch = new Quiz
                     {
                         LinhVuc = worksheet.Cells[row, 1].Text,
@@ -29,13 +32,16 @@ namespace QuizMaster.Service
                         B = worksheet.Cells[row, 4].Text,
                         C = worksheet.Cells[row, 5].Text,
                         D = worksheet.Cells[row, 6].Text,
-                        DapAn = worksheet.Cells[row, 7].Text
-                    };
 
+                        DapAn = Regex.Matches(answerText.ToUpper(), "[ABCD]")
+                            .Select(m => m.Value.Trim())
+                            .Distinct()
+                            .ToList(),
+                        DoKho = worksheet.Cells[row, 8].Text
+                    };
                     result.Add(ch);
                 }
             }
-
             return result;
         }
     }