ashx导出dataTable为Excel

一，datatable导出Excel，用户可以选择路径，方法如下：

 /// <summary>
    /// DataTable导出到Excel
    /// </summary>
    /// <param name="dt">DataTable类型的数据源</param>
    /// <param name="FileName">文件名</param>
    /// <param name="httpContext">httpcontext</param>
    public void CreateExcel(DataTable dt, string FileName, HttpContext httpContext)
    {
        httpContext.Response.Clear();
        httpContext.Response.Charset = "UTF-8";
        httpContext.Response.Buffer = true;
        httpContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
        httpContext.Response.AppendHeader("Content-Disposition", "attachment;filename=\"" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls\"");
        httpContext.Response.ContentType = "application/ms-excel";
        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 + "\t"; //栏位：自动跳到下一单元格
        }
        ls_item = ls_item.Substring(0, ls_item.Length - 1) + "\n";
        foreach (DataRow row in myRow)
        {
            for (i = 0; i < cl; i++)
            {
                if (i == (cl - 1))
                {
                    ls_item += row[i].ToString() + "\n";
                }
                else
                {
                    ls_item += row[i].ToString() + "\t";
                }
            }
            httpContext.Response.Output.Write(ls_item);
            ls_item = string.Empty;
        }
        httpContext.Response.Output.Flush();
        httpContext.Response.End();
    }

前端页面调用方法如下：

                <a  href="Import.ashx" >导出Excel</a>

二，datatable导出Excel，保存到服务器上。方法如下：

 /// <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 + "\t"; //栏位：自动跳到下一单元格
        }
        title = title.Substring(0, title.Length - 1) + "\n";
        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() + "\t"; //内容：自动跳到下一单元格
            }
            line = line.Substring(0, line.Length - 1) + "\n";
            sw.Write(line);
        }
        sw.Close();
        fs.Close();
    }

前端调用方法：

                     <a onclick="Import()">导出Excel</a>
     function Import() {
         $.post("Import.ashx", {}, function (data) {
             alert("导出成功");
         });
     }