ASP. NET uploads files using Web Service

We know that Silverlight 2 provides a wide range of network communication APIs, including support for SOAP services, REST services, HTTP-based communication, and Socket communication. This article uses several examples to demonstrate how to upload files and send emails in Silverlight 2.

ASP. NET uploads files using Web Service

I will use an example to demonstrate how to use Web Service to upload files. First, I will create a Silverlight project and add an ASP. NET Web Service file to the Web test project. Now we can implement the relevant WebMethod. In this method, we will receive two parameters: byte array and file extension, and create a file on the server, as shown in the following code:

 
 

  
  
C#   
  
  
[WebMethod]   
  
  
public int UploadFile(byte[] FileByte, String FileExtention)   
  
  
{   
  
  
FileStream stream = new FileStream(String.Format(@"D:\example.{0}", 
FileExtention),FileMode.CreateNew);   
  
  
stream.Write(FileByte, 0, FileByte.Length);   
  
  
stream.Close();   
  
  
return FileByte.Length;   
  
  
}  
 
 

Add a simple interface for users to select a local file. We will click the button to call Web Service in the event, as shown in the following code:
XAML

 
 

  
  
<Canvas Background="#FF333333">   
  
  
<TextBox x:Name="txtFile"></TextBox>   
  
  
<Button x:Name="btnUpload" Click="OnUploadClick"></Button>   
  
  
<TextBlock x:Name="tblStatus"></TextBlock>   
  
  
</Canvas>  
 
 

ASP.. NET calls Web Service to upload files. The OpenFileDialog object pop-up window is used to select files. This object returns the selected files as Stream, the following code converts Stream into a byte and passes it to Web Service:

 
 

  
  
VoidOnUploadClick (objectsender, RoutedEventArgse)
  
  
{
  
  
OpenFileDialogopenFile=NewOpenFileDialog();
  
  
 
  
  
If (openFile. ShowDialog () = DialogResult. OK)
  
  
{
  
  
StringfileName=OpenFile. SelectedFile. Name;
  
  
 
  
  
FileServiceSoapClientclient=NewFileServiceSoapClient();
  
  
Client. UploadFileCompleted + = newEventHandler<UploadFileCompletedEventArgs>
(OnUploadFileCompleted );
  
  
 
  
  
Streamstream= (Stream) openFile. SelectedFile. OpenRead ();
  
  
Stream. Position=0;
  
  
Byte []Buffer=Newbyte[Stream. Length + 1];
  
  
Stream. Read (buffer, 0, buffer. Length );
  
  
StringfileExtention=FileName. Substring (fileName. IndexOf ('.') + 1 );
  
  
 
  
  
Client. UploadFileAsync (buffer, fileExtention );
  
  
}
  
  
}
  
  
 
  
  
VoidOnUploadFileCompleted (objectsender, UploadFileCompletedEventArgse)
  
  
{
  
  
If (E. Error= Null)
  
  
{
  
  
TblStatus. Text="File Uploaded! ";
  
  
}
  
  
}
 
 

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