如何通过jquery ajax和C#下载文件

我想使用jQuery Ajax web方法下载文件,但它不起作用.

这是我对web方法的jQuery ajax调用：

function GenerateExcel() {
   var ResultTable = jQuery('<div/>').append(jQuery('<table/>').append($('.hdivBox').find('thead').clone()).append($('.bDiv').find('tbody').clone()));
   var list = [$(ResultTable).html()];
   var jsonText = JSON.stringify({ list: list });
   $.ajax({
          type: "POST",url: "GenerateMatrix.aspx/GenerateExcel",data: jsonText,contentType: "application/json; charset=utf-8",dataType: "json",success: function (response) {

          },failure: function (response) {
               alert(response.d);
          }
            });
        }

这是Web方法定义：

[System.Web.Services.WebMethod()]
public static string GenerateExcel(List<string> list)
{
    HttpContext.Current.Response.AppendHeader("content-disposition","attachment;filename=FileEName.xls");
    HttpContext.Current.Response.Charset = "";
    HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
    HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
    HttpContext.Current.Response.Write(list[0]);
    HttpContext.Current.Response.End();
    return "";
}

如何完成它？请帮帮我.
还有一件事：我想在客户端PC上下载它,而不是将其保存在服务器上.

解决方法

好吧,我用iframe完成了它

这是修改后的ajax函数调用

function GenerateExcel() {
            var ResultTable = jQuery('<div/>').append(jQuery('<table/>').append($('.hdivBox').find('thead').clone()).append($('.bDiv').find('tbody').clone()));
            var list = [$(ResultTable).html()];
            var jsonText = JSON.stringify({ list: list });
            $.ajax({
                type: "POST",success: function (response) {
                    if (isNaN(response.d) == false) {
                        $('#iframe').attr('src','GenerateMatrix.aspx?ExcelReportId=' + response.d);
                        $('#iframe').load();
                    }
                    else {
                        alert(response.d);
                    }
                },failure: function (response) {
                    alert(response.d);
                }
            });
        }

这是设计部分

<iframe id="iframe" style="display:none;"></iframe>

在页面加载我的代码看起来像这样

Response.AppendHeader("content-disposition","attachment;filename=FileEName.xls");
 Response.Charset = "";
 Response.Cache.SetCacheability(HttpCacheability.NoCache);
 Response.ContentType = "application/vnd.ms-excel";
 Response.Write(tablehtml);
 Response.End();