How to: Add Blocked File Types

Applies to: SharePoint Foundation 2010

This programming task shows how to create a simple console application to modify administrative property settings in a SharePoint Web application. The example uses the SPWebApplication.BlockedFileExtensions property to modify the list of blocked file types for a specified Web application.


Changes that you make to administrative settings will be disseminated asynchronously across the server farm and may require a few minutes to take effect.

To create a console application that adds blocked file types

  1. On the File menu in Visual Studio 2005, point to New and then click Project.

  2. In the New Project dialog box, select a language, and then select Visual C# in the Project Types box.

  3. In the Templates box, select Console Application.

  4. In the Location box, type the path to where to create the application, and then click OK.

  5. In Solution Explorer, right-click the References node, and then click Add Reference on the shortcut menu.

  6. On the .NET tab of the Add Reference dialog box, select Windows SharePoint Services in the list of components, and then click OK.

  7. In the .vb or .cs file, add directives to import the System.Collections.ObjectModel and Microsoft.SharePoint.Administration namespaces, as follows.

    Imports System.Collections.ObjectModel
    Imports Microsoft.SharePoint.Administration
    using System.Collections.ObjectModel;
    using Microsoft.SharePoint.Administration;
  8. Add the following code to the Main method in the .vb or .cs file.

    Dim webAppUrl As String = Console.ReadLine()
    Dim myBlockFileType As String = Console.ReadLine()
    Dim myUri As New Uri(webAppUrl)
    Dim myWebApp As SPWebApplication = SPWebApplication.Lookup(myUri)
    Dim blockFileTypes As Collection (Of String ) = myWebApp.BlockedFileExtensions
    string webAppUrl = Console.ReadLine();
    string myBlockFileType = Console.ReadLine();
    Uri myUri = new Uri(webAppUrl);
    SPWebApplication myWebApp = SPWebApplication.Lookup(myUri);
    Collection<string> blockFileTypes = myWebApp.BlockedFileExtensions;

    To remove a file extension, use the Remove method instead, and update the Web application as in the example.

  9. On the Debug menu, click Start, or press F5 to run the code.

See Also