settfsimage.cs

Microsoft.TeamFoundation.Client.TeamFoundationServer teamFoundationServer = new Microsoft.TeamFoundation.Client.TeamFoundationServer("http://UrlToTFS");
               
    FilteredIdentityService service = teamFoundationServer.GetService<FilteredIdentityService>(); ;
    IIdentityManagementService2 service2 = teamFoundationServer.GetService<IIdentityManagementService2>();
        
    foreach (var identity in service.SearchForUsers(""))
    {
        var user = UserPrincipal.FindByIdentity(new PrincipalContext(ContextType.Domain), identity.UniqueName);
        if (user == null) continue;
        var de = new System.DirectoryServices.DirectoryEntry("LDAP://" + user.DistinguishedName);
        var thumbNail = de.Properties["thumbnailPhoto"].Value as byte[];
                    
        identity.SetProperty("Microsoft.TeamFoundation.Identity.Image.Data", thumbNail);
        identity.SetProperty("Microsoft.TeamFoundation.Identity.Image.Type", "image/bmp");
        identity.SetProperty("Microsoft.TeamFoundation.Identity.Image.Id", Guid.NewGuid().ToByteArray());
        identity.SetProperty("Microsoft.TeamFoundation.Identity.CandidateImage.Data", null);
        identity.SetProperty("Microsoft.TeamFoundation.Identity.CandidateImage.UploadDate", null);
    
        service2.UpdateExtendedProperties(identity); 
    }