提交.Net6版本

Yi.Framework.Net6/Yi.Framework.Common/Helper/ExcelHelper.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using OfficeOpenXml;
+
+namespace Yi.Framework.Common.Helper
+{
+    public class ExcelHelper
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="dataList">数据</param>
+        /// <param name="headers">表头</param>
+        /// <returns></returns>
+        public static string CreateExcelFromList<T>(List<T> dataList, List<string> headers,string evn)
+        {
+            ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
+            string sWebRootFolder = Path.Combine($"{evn}", "wwwroot/Excel");//如果用浏览器url下载的方式  存放excel的文件夹一定要建在网站首页的同级目录下！！！
+            if (!Directory.Exists(sWebRootFolder))
+            {
+                Directory.CreateDirectory(sWebRootFolder);
+            }
+            string sFileName = $@"Excel_{DateTime.Now.ToString("yyyyMMddHHmmss")}.xlsx";
+            var path = Path.Combine(sWebRootFolder, sFileName);
+            FileInfo file = new FileInfo(path);
+            if (file.Exists)
+            {
+                file.Delete();
+                file = new FileInfo(path);
+            }
+            using (ExcelPackage package = new(file))
+            {
+                //创建sheet
+                ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("sheet1");
+                worksheet.Cells.LoadFromCollection(dataList, true);
+                //表头字段
+                for (int i = 0; i < headers.Count; i++)
+                {
+                    worksheet.Cells[1, i + 1].Value = headers[i];
+                }
+                for (int i = 0; i < headers.Count + 1; i++)
+                {//删除不需要的列
+                    string aa = worksheet.Cells[1, i + 1].Value.ToString();
+                    if (aa == "总行数")
+                    {
+                        worksheet.DeleteColumn(i + 1);
+                    }
+                }
+                package.Save();
+            }
+            //return path;//这是返回文件的方式
+            return sFileName;    //如果用浏览器url下载的方式  这里直接返回生成的文件名就可以了
+        }
+    }
+}