This article will explain, How to upload a file from SilverLight client to server location using WCF.
To achieve above task, follow the below steps. I am assuming here, that Reader has a basic concept of
2. Silver Light
3. Cross Domain Issue
4. Hosting of WCF Service
For details on these topics, you could find astronomical number of articles on the Web. To Read articles written by me on above topic please Click Here
Pictorial representation of output
Follow the Steps below
Create and Host the WCF Service.
- Create the Contract. This got only one method, which is taking as input a file to upload.
public interface IService1
void SaveFile(UploadFile UploadFile);
- Create the Data Contract. This is going to contain the information about the uploaded file. You could either put this UploadFile Data Contract in same file with contract or in separate file.
public class UploadFile
public string FileName;
public byte File;
- Implement the Service. We are simply creating instance of FileStream in create mode and writing the stream into that.
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
public class Service1 : IService1
public void SaveFile(UploadFile UploadFile)
FileStream FileStream = new FileStream("E:\\FileUpload\\" + UploadFile.FileName, FileMode.Create);
FileStream.Write(UploadFile.File, 0, UploadFile.File.Length);
- Modify the Web.Config. Binding to be used is basicHttpBinding. I am setting the Buffer size and max Message received size also here.
<binding name="ServicesBinding" maxReceivedMessageSize="2000000" maxBufferSize="2000000">
<readerQuotas maxArrayLength="2000000" maxStringContentLength="2000000"/>
<service name="FileUploadService.Service1" behaviorConfiguration="FileUploadService.Service1Behavior">
<!-- Service Endpoints -->
<endpoint address="" binding="basicHttpBinding" contract="FileUploadService.IService1">
Upon deployment, the following identity element should be removed or replaced to reflect the
identity under which the deployed service runs. If removed, WCF will infer an appropriate identity
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
- Host the service in IIS. Make sure you have put the access policy file at root directory of the server. If you have not done this, you will be getting cross domain error while accessing the service in Silver Light client. After hosting in IIS, browse the service to make sure, service is running and hosted properly.
For details of Cross domain issue read my article http://www.c-sharpcorner.com/UploadFile/dhananjaycoder/wcfandsilverlight04152009051036AM/wcfandsilverlight.aspx
By competing of Step 1, we have successfully created and hosted our service in IIS.
Create the Silver Light Client and consume the service
In belnd , I have just created one button and one text box. On clicking of the Button File Open Dialog Box will get open and user will select the file to uplaod. Text box is used to display the message thet whether file is successfully saved at server or not. If you don’t want to use Blend no issue. Just create a simple Silver Light application and add one button and text box on that.
Generated XAML code is as below.
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" x:Class="FileUpload.MainPage"
Width="Auto" Height="Auto" mc:Ignorable="d">
<Grid x:Name="LayoutRoot" Background="#FF241515" Margin="-0.05,0.044,-14.05,-15.956" RenderTransformOrigin="0.5,0.5" UseLayoutRounding="False" d:LayoutRounding="Auto" Width="420" Height="320">
<Button Margin="10,10,10,10" Background="#FF1688E9" BorderThickness="2,2,2,2" FontSize="18" FontWeight="Bold" Content="Click To Upload the File to Server" Click="Button_Click"/>
<TextBox x:Name="txtFileDisplayName" Margin="32.191,37.471,44.252,41.08" Grid.Row="1" Text="" TextWrapping="Wrap" Foreground="#FFA32929" BorderThickness="3,3,3,3" FontWeight="Bold" FontFamily="Arial Rounded MT Bold" FontSize="18"/>
Add the Service Reference
To add the Service Reference in the Silver Light, right click on the Service and add Service reference.
Write the code behind
public partial class MainPage : UserControl
public OpenFileDialog fileDialog = null;
Service1Client proxy = null;
proxy = new Service1Client();
private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
fileDialog = new OpenFileDialog();
fileDialog.Multiselect = false;
fileDialog.Filter = "All Files|*.*";
bool? retval = fileDialog.ShowDialog();
if (retval != null && retval == true)
Stream strm = fileDialog.File.OpenRead();
byte Buffer = new byte[strm.Length];
strm.Read(Buffer, 0, (int)strm.Length);
UploadFile file = new UploadFile();
file.FileName = fileDialog.File.Name;
file.File = Buffer;
proxy.SaveFileCompleted += new
txtFileDisplayName.Text = " No File Selected ";
void proxy_SaveFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
if (e.Error == null)
txtFileDisplayName.Text = fileDialog.File.Name + "Successfully Saved at ServerLocation";
Explanation of code
- We are here reading the file and converting content of the file in form of stream.
- We are creating instance of FileDialog to show file dialog to user and then select the file to be saved. Multi select is set to false. It means user can not select more than one file at one time.
- We are calling the Save File operation of service asynchronously on the proxy instance. Proxy is instance of the Service class.
- We are creating instance of Data Contract and assigning property values by reading the file name through FileOpenDialog and stream by converted stream
Press F5 to run the application
Thank you very much for reading this article. I hope, it would have helped you out.