C# asp.net 实现导出Excel(不用NOPI！) 直接遍历DataTable

转载自用，此方法比较好用，也不需要引入NOPI的dll和NOPI的帮助方法

原文地址【https://www.cnblogs.com/zhangjd/p/5673950.html】

一、实现DataTable数据导出到本地，需要自己传进去导出的路径。

/// <summary>
/// DataTable导出到Excel
/// </summary>
/// <param name="table">DataTable类型的数据源</param>
/// <param name="file">需要导出的文件路径</param>
public void dataTableToCsv(DataTable table, string file)
{
    string title = "";
    FileStream fs = new FileStream(file, FileMode.OpenOrCreate);
    StreamWriter sw = new StreamWriter(new BufferedStream(fs), System.Text.Encoding.Default);
    for (int i = 0; i < table.Columns.Count; i++)
    {
        title += table.Columns[i].ColumnName + "	"; //栏位：自动跳到下一单元格
    }
    title = title.Substring(0, title.Length - 1) + "
";
    sw.Write(title);
    foreach (DataRow row in table.Rows)
    {
        string line = "";
        for (int i = 0; i < table.Columns.Count; i++)
        {
            line += row[i].ToString().Trim() + "	"; //内容：自动跳到下一单元格
        }
        line = line.Substring(0, line.Length - 1) + "
";
        sw.Write(line);
    }
    sw.Close();
    fs.Close();
}

二、实现DataTable数据导出到本地，路径可以由用户自主选择。

/// <summary>
/// DataTable导出到Excel
/// </summary>
/// <param name="dt">DataTable类型的数据源</param>
/// <param name="FileType">文件类型</param>
/// <param name="FileName">文件名</param>
public void CreateExcel(DataTable dt, string FileType, string FileName)
{
    Response.Clear();
    Response.Charset = "UTF-8";
    Response.Buffer = true;
    Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
    Response.AppendHeader("Content-Disposition", "attachment;filename="" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls"");
    Response.ContentType = FileType;
    string colHeaders = string.Empty;
    string ls_item = string.Empty;
    DataRow[] myRow = dt.Select();
    int i = 0;
    int cl = dt.Columns.Count;
    for (int j = 0; j < dt.Columns.Count; j++)
    {
        ls_item += dt.Columns[j].ColumnName + "	"; //栏位：自动跳到下一单元格
    }
    ls_item = ls_item.Substring(0, ls_item.Length - 1) + "
";
    foreach (DataRow row in myRow)
    {
        for (i = 0; i < cl; i++)
        {
            if (i == (cl - 1))
            {
                ls_item += row[i].ToString() + "
";
            }
            else
            {
                ls_item += row[i].ToString() + "	";
            }
        }
        Response.Output.Write(ls_item);
        ls_item = string.Empty;
    }
    Response.Output.Flush();
    Response.End();
}

三、方法的调用。

第一种方法的调用：

this.dataTableToCsv(dt, @"C:UsersAdminDesktop收听率" + DateTime.Now.ToString("yyyy-MM-dd HHmmss") + ".xls"); //调用函数

 第二种方法的调用：

CreateExcel(dt, "application/ms-excel", "Excel" + DateTime.Now.ToString("yyyy-MM-dd HHmmss") + ".xls");//调用函数

这两种方法都是可以直接调用的，只需要传入需要的参数即可。

如果是通过前台js方式实现，跳转href为实现数据导出的页面地址，我是通过前台跳转到ashx页面实现的

ashx页面内容

public void ProcessRequest(HttpContext context)
        {string message = "";
            string Action = context.Request["Action"];
            switch (Action)
            {case "Excel":
                    DataTable Radio = GetExcleData(context); //获取导出数据源
                    RadioCommon helper = new RadioCommon();
                    helper.ExportExcel(Radio, "application/ms-excel", "Excel" + DateTime.Now.ToString("yyyy-MM-dd HHmmss"));
                    break;
            }
            context.Response.Write(message);
        }

js部分内容

  $("#Excel").bind('click', function () {
                var url = "AjaxHandler/RadioFamilyDayNumber.ashx?Action=Excel";
                window.location.href = url;//导出Excel
            })