Question

我正在努力通过WebAPI使用.Net Framework 4.0

下载PDF文件

当调用rest服务器时，它会在request.GetResponse（）上抛出500错误，我无法理解为什么。我看过其他各种例子，我已经遵循了，但我仍然遇到同样的问题。有人可以帮忙吗？

以下代码是我的RestFul服务中的内容：

          [HttpPost]
    public HttpResponseMessage GetPdfRecordData()
    {

        HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
        var stream = new FileStream(pdfDoc, FileMode.Open);
        stream.Position = 0;
        result.Content = new StreamContent(stream);
        result.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment") { FileName = "pdf" };
        result.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
        result.Content.Headers.ContentDisposition.FileName = "pdf";
        return result;
    }

以下代码是从Winforms调用它的地方：

             private void GetPDF()
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URI);
        request.ContentType = "application/pdf";
        request.Method = "POST";

       HttpWebResponse response =(HttpWebResponse)request.GetResponse();

       byte[] bytes = null;
       using (Stream stream = response.GetResponseStream())
       using (MemoryStream ms = new MemoryStream())
       {
           int count = 0;
           do
           {
               byte[] buf = new byte[1024];
               count = stream.Read(buf, 0, 1024);
               ms.Write(buf, 0, count);
           } while (stream.CanRead && count > 0);
           ms.Position = 0;
           bytes = ms.ToArray();
       }

       var filename = "pdf" + ".pdf";

       HttpContext.Current.Response.ContentType = "application/pdf";
       HttpContext.Current.Response.Headers.Add("Content-Disposition", "attachment; filename=\"" + filename + "\"");
       HttpContext.Current.Response.BinaryWrite(bytes);

Full StackTrace：

at System.Net.HttpWebRequest.GetResponse（） at WindowsFormsApplication1.Form1.GetPDF（）在C：\ Users \ Andrew \ documents \ visual studio 2010 \ Projects \ WindowsFormsApplication1 \ WindowsFormsApplication1 \ Form1.cs：line 216 at WindowsFormsApplication1.Form1.btnPDF_Click（Object sender，EventArgs e）位于C：\ Users \ Andrew \ documents \ visual studio 2010 \ Projects \ WindowsFormsApplication1 \ WindowsFormsApplication1 \ Form1.cs：第265行在System.Windows.Forms.Control.OnClick（EventArgs e）在System.Windows.Forms.Button.OnClick（EventArgs e）在System.Windows.Forms.Button.OnMouseUp（MouseEventArgs mevent）在System.Windows.Forms.Control.WmMouseUp（消息＆amp; m，MouseButtons按钮，Int32点击）在System.Windows.Forms.Control.WndProc（消息＆amp; m）在System.Windows.Forms.ButtonBase.WndProc（消息＆amp; m）在System.Windows.Forms.Button.WndProc（消息＆amp; m）在System.Windows.Forms.Control.ControlNativeWindow.OnMessage（Message＆amp; m）在System.Windows.Forms.Control.ControlNativeWindow.WndProc（Message＆amp; m）在System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd，Int32 msg，IntPtr wparam，IntPtr lparam）在System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW（MSG＆amp; msg）在System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop（IntPtr dwComponentID，Int32 reason，Int32 pvLoopData）在System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner（Int32 reason，ApplicationContext context）在System.Windows.Forms.Application.ThreadContext.RunMessageLoop（Int32 reason，ApplicationContext context）在System.Windows.Forms.Application.Run（Form mainForm） at WindowsFormsApplication1.Program.Main（）在C：\ Users \ Andrew \ documents \ visual studio 2010 \ Projects \ WindowsFormsApplication1 \ WindowsFormsApplication1 \ Program.cs：第18行在System.AppDomain._nExecuteAssembly（RuntimeAssembly程序集，String [] args）在System.AppDomain.ExecuteAssembly（String assemblyFile，Evidence assemblySecurity，String [] args）在Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly（）在System.Threading.ThreadHelper.ThreadStart_Context（对象状态） at System.Threading.ExecutionContext.RunInternal（ExecutionContext executionContext，ContextCallback callback，Object state，Boolean preserveSyncCtx） at System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback callback，Object state，Boolean preserveSyncCtx）在System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback回调，对象状态）在System.Threading.ThreadHelper.ThreadStart（）

远程服务器返回500内部服务器错误Asp.Net Web API

0 个答案: