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  • asp.net中导出Excel通用型

    前端请求:

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

    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;
    }

    后台处理请求:

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

    //这里的useridx  page pagesize bdate edate 导出时的条件
    List<CashDetailsList> stuList = server.CashDetailsList(useridx, page, pagesize, bdate, edate);
    stuList.Export("星探提现明细");

    ///Export这里是导出操作封装的通用类,在做所有导出只要传一个参数就是导出文件的名称就行

    下面就是通用型导出的核心

      首先将List<CashDetailsList>添加一个扩展类型 ,目的是要得到一个stuList.Export(“”“”)

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

    然后再封装一个类,这里存放导出的操作

    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相关操作
    // 依赖项: NPOI(2.3.0) Nuget 添加命令:Install-Package NPOI -Version 2.3.0
    // NPOI(2.3.0)依赖项 SharpZipLib (>= 0.86.0)

    //注意这里的静态类,再调用时需要传一个对象,如果是静态变量,会只执行一次

    ///这步操作目的是,遍历出实体类中的属性和名字,实体类的写法例如:

    [Export("编号")]
    public int rowid { get; set; }
    public int count { get; set; }
    [Export("用户IDX")]
    public long useridx { get; set; }
    [Export("用户名")]
    public string myName { get; set; }
    [Export("支付宝账户")]

    public class ExcelHelper<T> where T : new()
    {
    private static List<ColumnInfo> _columns;  ///将得到的实体类属性和名称存入泛型集合中
    static ExcelHelper()
    {
    _columns = new List<ColumnInfo>();
    foreach (var pro in typeof(T).GetProperties())
    {
    ExportAttribute attribute = (ExportAttribute)pro.GetCustomAttribute(typeof(ExportAttribute)); ///得到实体中的属性
    if (attribute != null)
    {
    _columns.Add(new ColumnInfo() { name = attribute.columnName, property = pro }); ////得到实体中的名称
    }
    }
    }

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

    ////这一步是设置导出的一些属性,字符节,导出文件名称

    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();
    }
    }
    }

    /////////遍历泛型集合得到行和列

    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; } //得到属性名称
    public PropertyInfo property { get; set; } //得到属性
    }

    }

    ////以上就是本人将导出Excel,封装成通用型的一些见解,才疏学浅,还望指教。

      

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  • 原文地址:https://www.cnblogs.com/yjm8023/p/9298051.html
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