如何在Web方法中从服务器下载文件？ [英] How to download file from server in web method ?

问题描述

我不知道如何使用web方法从服务器下载文件。我试过这样的事。 
我将angularJS中的数据和文件名传递给我的web方法，它创建了excel文件并在服务器中上传。完成文件创建并在服务器上传后
我成功调用我的JS函数后将url返回到另一个webform。 
从那里我试图打开新的Web表单，我试图实现下载文件的代码。但是，我的代码将如何知道下载
的生命，因为可能会有多个文件。我如何传递fileName以便我可以识别要下载的文件。 
 
请检查我的代码，让我知道要改变什么以及该怎么做？或任何其他方式来实现这一目标。 
谢谢。

我尝试过：

 [WebMethod] 
公共静态字符串ExportExcel（List< Student> students，string fileName）
 {
 
 ListtoDataTableConverter converter = new ListtoDataTableConverter（）; 
 
 DataTable dt = converter.ToDataTable（学生）; 
 DataSet ds = new DataSet（）; 
 ds.Tables.Add（dt）; 
 
 string FilePath = fileLocation + fileName + DateTime.Now.ToString（yyyyMMddHHmmssfff）+。xlsx; ; 
 
 DataSetToExcel.ExportDataSet（FilePath，ds）; 
 
 HttpContext.Current.Response.ContentType =application / octet-stream; 
 HttpContext.Current.Response.AppendHeader（Content-Disposition，filename =+ Path.GetFileName（FilePath））; 
 
返回JsonConvert.SerializeObject（new {Success = true，redirectUrl = VirtualPathUtility.ToAbsolute（〜/ DownloadExcelForm.aspx）}）; 
 
} 
 
 
 
 Javascript：
 
 $ scope.SendFile = function（filteredItems）{
 var xlFile = $ scope.xlFilename; 
 var students = []; 
 students = filteredItems; 
 
 $ http（{
方法：POST，
 url：ReportStudent.aspx / ExportExcel，
数据：{学生：学生，文件名：xlFile }，
 contentType：application / json，
 dataType：json
}）。then（function（response）{
 var responsedata = JSON.parse（response。 data.d）; 
 window.location.href = responsedata.redirectUrl; 
 
}）; 
 
}; 
 
 Webform Pageload：
 protected void Page_Load（object sender，EventArgs e）
 {
 
 string filepath =; 
 Response.ContentType = ContentType; 
 // Response.AppendHeader（Content-Disposition，attachment; filename =+ Path.GetFileName（FilePath））;如何传递此文件路径???? 
 Response.TransmitFile（FilePath）; 
 Response.Flush（）; 
 System.Threading.Thread.Sleep（1000）; 
 System.Threading.Thread.Sleep（1000）; 
 if（File.Exists（filepath））
 {
 File.Delete（filepath）; 
} 
 //response.writefile(filepath）
 Response.End（）; 
 
} 

解决方案

scope.SendFile = function（filteredItems）{
var xlFile =

scope.xlFilename;
var students = [];
students = filteredItems;

http（{
method：POST，
url：ReportStudent.aspx / ExportExcel，
数据：{学生：学生，文件名：xlFile}，
contentType：application / json，
dataType：json
}）。then（function（response）{
var responsedata = JSON.parse（response.data.d）;
window.location.href = responsedata.redirectUrl;

}）;

};

Webform Pageload：
protected void Page_Load（object sender，EventArgs e）
{

string filepath =;
Response.ContentType = ContentType;
// Response.AppendHeader（Content-Disposition，attachment; filename =+ Path.GetFileName（FilePath））;如何传递此文件路径????
Response.TransmitFile（FilePath）;
Response.Flush（）;
System.Threading.Thread.Sleep（1000）;
System.Threading.Thread.Sleep（1000）;
if（File.Exists（filepath））
{
File.Delete（filepath）;
}
//response.writefile(filepath）
Response.End（）;

}

I do not know how to achieve to download file from server using web method. I tried something like this. 
I passed data and file name from angularJS to my web method, it creates excel file and upload in server. 
after completion of file creation and upload in server i returned url to another webform on success call to my JS function. 
From there I tried to open new web form where i am trying to implement code to download file. But how would my code will know which life to 
download since there could be multiple file presented. how so i pass fileName as well so that i could identified the file to download.

Please check my code and let me know what to change and what to do ? or anyother way to achieve this. 
Thank you.

What I have tried:

[WebMethod]
        public static string ExportExcel(List<Student> students, string fileName)
        {
          
                    ListtoDataTableConverter converter = new ListtoDataTableConverter();

                    DataTable dt = converter.ToDataTable(students);
                    DataSet ds = new DataSet();
                    ds.Tables.Add(dt);

                    string FilePath = fileLocation + fileName + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xlsx"; ;

                    DataSetToExcel.ExportDataSet(FilePath, ds);

                    HttpContext.Current.Response.ContentType = "application/octet-stream";
                    HttpContext.Current.Response.AppendHeader("Content-Disposition", "filename=" + Path.GetFileName(FilePath));
                  
                    return JsonConvert.SerializeObject(new { Success = true, redirectUrl = VirtualPathUtility.ToAbsolute("~/DownloadExcelForm.aspx") });
       
        }
		
		

Javascript:

  $scope.SendFile = function (filteredItems) {
        var xlFile = $scope.xlFilename;
        var students = [];
        students = filteredItems ;
      
        $http({
            method: "POST",
            url: "ReportStudent.aspx/ExportExcel",
            data: { students: students, fileName: xlFile },
            contentType: "application/json",
            dataType: "json"
        }).then(function (response) {
            var responsedata = JSON.parse(response.data.d);
            window.location.href = responsedata.redirectUrl;
          
        });

    };
	
Webform Pageload:
 protected void Page_Load(object sender, EventArgs e)
        {
           
            string filepath = "";
            Response.ContentType = ContentType;
          //  Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(FilePath)); how to pass this file path ????
            Response.TransmitFile(FilePath);
            Response.Flush();
            System.Threading.Thread.Sleep(1000);
                System.Threading.Thread.Sleep(1000);
                if (File.Exists(filepath))
                {
                    File.Delete(filepath);
                }
                //response.writefile(filepath)
                Response.End();
            
        }

解决方案

scope.SendFile = function (filteredItems) { var xlFile =

scope.xlFilename; var students = []; students = filteredItems ;

http({ method: "POST", url: "ReportStudent.aspx/ExportExcel", data: { students: students, fileName: xlFile }, contentType: "application/json", dataType: "json" }).then(function (response) { var responsedata = JSON.parse(response.data.d); window.location.href = responsedata.redirectUrl; }); }; Webform Pageload: protected void Page_Load(object sender, EventArgs e) { string filepath = ""; Response.ContentType = ContentType; // Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(FilePath)); how to pass this file path ???? Response.TransmitFile(FilePath); Response.Flush(); System.Threading.Thread.Sleep(1000); System.Threading.Thread.Sleep(1000); if (File.Exists(filepath)) { File.Delete(filepath); } //response.writefile(filepath) Response.End(); }

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