asp.net中導出Excel通用型

前端請求:javascript

<a class="btn btn-default ml-50" href="javascript:Out_Excel();">導出Excel</a>  前端

function Out_Excel() {
var bdate = $("#tisStartTime").val();
var edate = $("#titsEndTime").val();
var useridx = $("#useridx").val();
window.location.href = "/ActivityManagement/ExportExcel?bdate=" + bdate + "&edate=" + edate + "&useridx=" + useridx;
}java

 

後臺處理請求:app

int pagesize = int.MaxValue;
if (bdate == null || edate == null)
{
bdate = DateTime.Today.AddDays(-30);
edate = DateTime.Today.AddDays(1);
}this

//這裏的useridx  page pagesize bdate edate 導出時的條件
List<CashDetailsList> stuList = server.CashDetailsList(useridx, page, pagesize, bdate, edate);
stuList.Export("星探提現明細");spa

///Export這裏是導出操做封裝的通用類,在作全部導出只要傳一個參數就是導出文件的名稱就行excel

 

下面就是通用型導出的核心server

  首先將List<CashDetailsList>添加一個擴展類型 ,目的是要獲得一個stuList.Export(「」「」)對象

public static void Export<T>(this IEnumerable<T> list, string fileName) where T : new()
{
ExcelHelper<T>.Export(list, fileName);
}ip

 

而後再封裝一個類,這裏存放導出的操做

using MaoLiao.Infrastructure.Attributes;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace MaoLiao.Common
{
// Excel相關操做
// 依賴項: NPOI(2.3.0) Nuget 添加命令:Install-Package NPOI -Version 2.3.0
// NPOI(2.3.0)依賴項 SharpZipLib (>= 0.86.0)

 

//注意這裏的靜態類,再調用時須要傳一個對象,若是是靜態變量,會只執行一次

///這步操做目的是,遍歷出實體類中的屬性和名字,實體類的寫法例如:

[Export("編號")]
public int rowid { get; set; }
public int count { get; set; }
[Export("用戶IDX")]
public long useridx { get; set; }
[Export("用戶名")]
public string myName { get; set; }
[Export("支付寶帳戶")]

 

public class ExcelHelper<T> where T : new()
{
private static List<ColumnInfo> _columns;  ///將獲得的實體類屬性和名稱存入泛型集合中
static ExcelHelper()
{
_columns = new List<ColumnInfo>();
foreach (var pro in typeof(T).GetProperties())
{
ExportAttribute attribute = (ExportAttribute)pro.GetCustomAttribute(typeof(ExportAttribute)); ///獲得實體中的屬性
if (attribute != null)
{
_columns.Add(new ColumnInfo() { name = attribute.columnName, property = pro }); ////獲得實體中的名稱
}
}
}

//////////////////////////////////////////////////////////////////

 

 

////這一步是設置導出的一些屬性,字符節,導出文件名稱

public static void Export(IEnumerable<T> list, string fileName)
{
HttpContext curContext = HttpContext.Current;
if (curContext != null)
{
if (!fileName.EndsWith(".xls") && !fileName.EndsWith(".xlsx"))
{
fileName += ".xls";
}
using (MemoryStream stream = IEnumerableToStream(list))
{
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = Encoding.UTF8;
curContext.Response.Charset = "UTF-8";
curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);
curContext.Response.BinaryWrite(stream.ToArray());
curContext.Response.End();
}
}
}

 

 

 

/////////遍歷泛型集合獲得行和列

private static MemoryStream IEnumerableToStream(IEnumerable<T> list)
{
HSSFWorkbook book = new HSSFWorkbook();
ISheet sheet1 = book.CreateSheet("Sheet1");

//列
IRow titles = sheet1.CreateRow(0);
int col = 0;
foreach (var c in _columns)
{
titles.CreateCell(col++).SetCellValue(c.name);
}

//行
int row = 1;
foreach (var entity in list)
{
col = 0;
IRow _row = sheet1.CreateRow(row++);
foreach (var c in _columns)
{
object value = c.property.GetValue(entity);
string cellValue = value == null ? string.Empty : value.ToString();
_row.CreateCell(col++).SetCellValue(cellValue);
}
}
using (MemoryStream stream = new MemoryStream())
{
book.Write(stream);
return stream;
}
}
}

public class ColumnInfo
{
public string name { get; set; } //獲得屬性名稱
public PropertyInfo property { get; set; } //獲得屬性
}

}

 

 

////以上就是本人將導出Excel,封裝成通用型的一些看法,才疏學淺,還望指教。

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