支持传入多个类型 Collection<T> 进行导出

src/Magicodes.ExporterAndImporter.Excel/ExcelExporter.cs

@@ -37,7 +37,7 @@ namespace Magicodes.ExporterAndImporter.Excel
     /// </summary>
     public class ExcelExporter : IExcelExporter
     {
-
+        private ExcelPackage _excelPackage;
         /// <summary>
         ///     导出Excel
         /// </summary>
@@ -50,8 +50,42 @@ public async Task<ExportFileInfo> Export<T>(string fileName, ICollection<T> data
             var bytes = await ExportAsByteArray(dataItems);
             return bytes.ToExcelExportFileInfo(fileName);
         }
+        /// <summary>
+        /// append collectioin to context
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="dataItems"></param>
+        /// <returns></returns>
+        public ExcelExporter Append<T>(ICollection<T> dataItems) where T : class
+        {
+
+            var helper = this._excelPackage == null ? new ExportHelper<T>() : new ExportHelper<T>(_excelPackage);
+            var sheetName = helper.ExcelExporterSettings?.Name ?? "导出结果";
+
+            if (this._excelPackage?.Workbook.Worksheets.Any(x => x.Name == sheetName) ?? false)
+            {
+                throw new ArgumentNullException($"已经存在名字为{sheetName }的sheet");
+            }
+            this._excelPackage = helper.Export(dataItems);
 
-
+            return this;
+        }
+
+        /// <summary>
+        /// export excel after append all collectioins
+        /// </summary>
+        /// <param name="fileName"></param>
+        /// <returns></returns>
+        public ExportFileInfo Export(string fileName)
+        {
+            fileName.CheckExcelFileName();
+            if (this._excelPackage == null)
+            {
+                throw new ArgumentNullException("this method can only be called after method Append<T>;");
+            }
+            var bytes = _excelPackage.GetAsByteArray();
+            return bytes.ToExcelExportFileInfo(fileName);
+        }
 
         /// <summary>
         ///     导出Excel

src/Magicodes.ExporterAndImporter.Excel/IExcelExporter.cs

@@ -1,4 +1,5 @@
-using Magicodes.ExporterAndImporter.Core;
+using System.Collections.Generic;
+using Magicodes.ExporterAndImporter.Core;
 using Magicodes.ExporterAndImporter.Core.Filters;
 using Magicodes.ExporterAndImporter.Core.Models;
 using System.Data;
@@ -36,5 +37,24 @@ public interface IExcelExporter : IExporter, IExportFileByTemplate
         /// <param name="maxRowNumberOnASheet">一个Sheet最大允许的行数，设置了之后将输出多个Sheet</param>
         /// <returns>文件二进制数组</returns>
         Task<byte[]> ExportAsByteArray(DataTable dataItems, IExporterHeaderFilter exporterHeaderFilter = null, int maxRowNumberOnASheet = 1000000);
+
+
+        /// <summary>
+        /// append the collection to context
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="dataItems"></param>
+        /// <returns></returns>
+        ExcelExporter Append<T>(ICollection<T> dataItems) where T : class;
+
+
+
+        /// <summary>
+        /// export excel after append all collectioins
+        /// </summary>
+        /// <param name="fileName"></param>
+        /// <returns></returns>
+        ExportFileInfo Export(string fileName);
+
     }
 }

src/Magicodes.ExporterAndImporter.Excel/Utility/ExportHelper.cs

@@ -38,6 +38,23 @@ public ExportHelper()
                 IsDynamicDatableExport = true;
             }
         }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="existExcelPackage"></param>
+
+        public ExportHelper(ExcelPackage existExcelPackage)
+        {
+            if (typeof(DataTable).Equals(typeof(T)))
+            {
+                IsDynamicDatableExport = true;
+            }
+            if (existExcelPackage != null)
+            {
+                this._excelPackage = existExcelPackage;
+            }
+        }
+
 
         /// <summary>
         ///     导出设置

src/Magicodes.ExporterAndImporter.Tests/ExcelExporter_Tests.cs

@@ -292,6 +292,29 @@ public async Task ExportAsByteArray_Test()
             File.Exists(filePath).ShouldBeTrue();
         }
 
+
+        [Fact(DisplayName = "多个sheet导出")]
+        public async Task ExportMutiCollection_Test()
+        {
+            var exporter = new ExcelExporter();
+
+            var filePath = GetTestFilePath($"{nameof(ExportMutiCollection_Test)}.xlsx");
+
+            DeleteFile(filePath);
+
+
+            var list1 = GenFu.GenFu.ListOf<ExportTestDataWithAttrs>();
+
+            var list2 = GenFu.GenFu.ListOf<ExportTestDataWithSplitSheet>(30);
+
+
+            var result = exporter.Append(list1).Append(list2).Export(filePath);
+            result.ShouldNotBeNull();
+
+            File.Exists(filePath).ShouldBeTrue();
+        }
+
+
         [Fact(DisplayName = "通过Dto导出表头")]
         public async Task ExportHeaderAsByteArray_Test()
         {

src/Magicodes.ExporterAndImporter.Tests/Models/Export/ExportTestDataWithSplitSheet.cs

@@ -17,7 +17,7 @@
 
 namespace Magicodes.ExporterAndImporter.Tests.Models.Export
 {
-    [ExcelExporter(Name = "测试", TableStyle = "Light10", AutoFitAllColumn = true, MaxRowNumberOnASheet = 100)]
+    [ExcelExporter(Name = "测试2", TableStyle = "Light10", AutoFitAllColumn = true, MaxRowNumberOnASheet = 100)]
     public class ExportTestDataWithSplitSheet
     {
         [ExporterHeader(DisplayName = "加粗文本", IsBold = true)]