Silverlight文件上载控件无法在托管应用程序上运行。 [英] Silverlight file Upload control not working over hosted application.

问题描述

我在asp.net应用程序中使用银光文件上传控件。它的结构类似如下所示，现在调试localhost：55000 / FileUpload.ashx上传（最终在同一台机器上复制）文件正常，但是当我使用托管应用程序的/FileUpload.ashx时，是不做任何事情，实际上永远不会调用FileUpload.ashx。

I'm Using a silver-light file upload control in asp.net application. Its of similar structure as written below, now While debugging localhost:55000/FileUpload.ashx uploads (eventualy copy on same machine) the file properly, but when i use /FileUpload.ashx of an hosted application, is doesn't do any thing, infact FileUpload.ashx is never called.

public const int CHUNK_SIZE = 4096; 
public const string UPLOAD_URI = "http://localhost:55000/FileUpload.ashx?filename={0}&append={1}"; 
private Stream _data; 
private string _fileName; 
private long
_bytesTotal; 
private long _bytesUploaded;   
private void UploadFileChunk() 
{
    string uploadUri = ""; // Format the upload URI according to wether the it's the first chunk of the file
    if (_bytesUploaded == 0)
    {
        uploadUri = String.Format(UPLOAD_URI,_fileName,0); // Dont't append
    }
    else if (_bytesUploaded < _bytesTotal)
    {
        uploadUri = String.Format(UPLOAD_URI, _fileName, 1); // append
    }
    else
    {
        return;  // Upload finished
    }

    byte[] fileContent = new byte[CHUNK_SIZE];
    _data.Read(fileContent, 0, CHUNK_SIZE);

    WebClient wc = new WebClient();
    wc.OpenWriteCompleted += new OpenWriteCompletedEventHandler(wc_OpenWriteCompleted);
    Uri u = new Uri(uploadUri);
    wc.OpenWriteAsync(u, null, fileContent);
    _bytesUploaded += fileContent.Length; 
}   

void wc_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e) 
{
    if (e.Error == null)
    {   
        object[] objArr = e.UserState as object[];
        byte[] fileContent = objArr[0] as byte[];
        int bytesRead = Convert.ToInt32(objArr[1]);
        Stream outputStream = e.Result;
        outputStream.Write(fileContent, 0, bytesRead);
        outputStream.Close();
        if (_bytesUploaded < _bytesTotal)
        {
            UploadFileChunk();
        }
        else
        {
            // Upload complete
        }
    } 
}

推荐答案

您必须按照 Silverlight提升的权限
$ b所述提供高级权限$ b [ ^ ]。完全信任权限是您应该瞄准的目标..

You have to give elevated permissions as described at Silverlight Elevated Permissions
[^]. Full Trust permissions are what you should aim for..

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