/// <summary>Calls each registered authentication module to find the first module that can respond to the authentication request.</summary>
/// <returns>An instance of the <see cref="T:System.Net.Authorization" /> class containing the result of the authorization attempt. If there is no authentication module to respond to the challenge, this method returns null.</returns>
/// <param name="challenge">The challenge returned by the Internet resource. </param>
/// <param name="request">The <see cref="T:System.Net.WebRequest" /> that initiated the authentication challenge. </param>
/// <param name="credentials">The <see cref="T:System.Net.ICredentials" /> associated with this request. </param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="challenge" /> is null.-or- <paramref name="request" /> is null.-or- <paramref name="credentials" /> is null. </exception>
/// <PermissionSet>
/// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="ControlEvidence" />
/// </PermissionSet>
public static Authorization Authenticate(string challenge, WebRequest request, ICredentials credentials)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
if (credentials == null)
{
throw new ArgumentNullException("credentials");
}
if (challenge == null)
{
throw new ArgumentNullException("challenge");
}
return(AuthenticationManager.DoAuthenticate(challenge, request, credentials));
}
