From 1c09b2934f041f5d311a96888c6084b92909a057 Mon Sep 17 00:00:00 2001
From: ltx <1006158920@qq.com>
Date: Fri, 31 Jul 2026 15:44:11 +0800
Subject: [PATCH] =?UTF-8?q?update=EF=BC=9A=E4=BD=9C=E4=B8=9A=E5=88=97?=
 =?UTF-8?q?=E8=A1=A8=E5=AF=BC=E5=87=BA=E6=8A=A5=E9=94=99?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 VOL.Core/Utilities/Tool.cs                    | 48 ++++++++++++++++---
 .../Business/HomeWorkController.cs            |  2 +-
 2 files changed, 43 insertions(+), 7 deletions(-)

diff --git a/VOL.Core/Utilities/Tool.cs b/VOL.Core/Utilities/Tool.cs
index 58d3db3..6f733f8 100644
--- a/VOL.Core/Utilities/Tool.cs
+++ b/VOL.Core/Utilities/Tool.cs
@@ -89,7 +89,10 @@ namespace VOL.Core.Utilities
             }
         }
 
-        public static byte[] ExportToExcel<T>(Dictionary<string, List<T>> sheetDataList, List<string> fields)
+        public static byte[] ExportToExcel<T>(
+            Dictionary<string, List<T>> sheetDataList,
+            List<string> fields,
+            bool autoFitColumns = true)
         {
             using (var package = new ExcelPackage(new FileInfo("filename.xlsx")))
             {
@@ -101,7 +104,7 @@ namespace VOL.Core.Utilities
                     var sheetName = sheet.Key;
 
                     var worksheet = package.Workbook.Worksheets.Add(sheetName);
-                    ConfigureWorksheet<T>(worksheet, sheetData, fields);
+                    ConfigureWorksheet(worksheet, sheetData, fields, autoFitColumns);
                 }
 
                 return package.GetAsByteArray();
@@ -301,7 +304,11 @@ namespace VOL.Core.Utilities
         /// <param name="worksheet"></param>
         /// <param name="sheetData"></param>
         /// <param name="fields"></param>
-        private static void ConfigureWorksheet<T>(ExcelWorksheet worksheet, IEnumerable<T> sheetData, List<string> fields)
+        private static void ConfigureWorksheet<T>(
+            ExcelWorksheet worksheet,
+            IEnumerable<T> sheetData,
+            List<string> fields,
+            bool autoFitColumns)
         {
             // 添加表头
             for (int i = 0; i < fields.Count; i++)
@@ -335,8 +342,37 @@ namespace VOL.Core.Utilities
                 }
             }
 
-            // 自动调整列宽
-            worksheet.Cells.AutoFitColumns();
+            if (autoFitColumns)
+            {
+                worksheet.Cells.AutoFitColumns();
+                return;
+            }
+
+            SetColumnWidthsWithoutGdi(worksheet, fields.Count);
+        }
+
+        private static void SetColumnWidthsWithoutGdi(ExcelWorksheet worksheet, int columnCount)
+        {
+            const double minWidth = 10;
+            const double maxWidth = 40;
+
+            for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++)
+            {
+                var maxContentWidth = worksheet.Cells
+                    .Where(cell => cell.Start.Column == columnIndex)
+                    .Select(cell => GetExcelContentWidth(cell.Value))
+                    .DefaultIfEmpty((int)minWidth)
+                    .Max();
+
+                worksheet.Column(columnIndex).Width =
+                    Math.Min(maxWidth, Math.Max(minWidth, maxContentWidth + 2));
+            }
+        }
+
+        private static int GetExcelContentWidth(object value)
+        {
+            var text = value?.ToString() ?? string.Empty;
+            return text.Sum(character => character > 255 ? 2 : 1);
         }
         private static string GetDisplayName<T>(string propertyName)
         {
@@ -749,4 +785,4 @@ namespace VOL.Core.Utilities
             return chineseNumbers[tens] + "十" + (units == 0 ? "" : chineseNumbers[units]);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/VOL.WebApi/Controllers/Business/HomeWorkController.cs b/VOL.WebApi/Controllers/Business/HomeWorkController.cs
index 8275e19..cba9770 100644
--- a/VOL.WebApi/Controllers/Business/HomeWorkController.cs
+++ b/VOL.WebApi/Controllers/Business/HomeWorkController.cs
@@ -77,7 +77,7 @@ namespace VOL.WebApi.Controllers.Business
                 nameof(HomeWorkStudentExportModel.Result)
             };
 
-            var excelBytes = Tool.ExportToExcel(sheets, columns);
+            var excelBytes = Tool.ExportToExcel(sheets, columns, autoFitColumns: false);
             var fileName = $"作业学生明细{DateTime.Now:yyyyMMddHHmmss}.xlsx";
             return File(
                 excelBytes,