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PONullReferenceException in SharpSvn's SvnClient when the supplied DefaultCredentials returns null
 

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  1. PONullReferenceException in SharpSvn's SvnClient when the supplied DefaultCredentials returns null
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    <p>I'm using SharpSvn in my project to communicate with SVN. For some SVN repostories, I already know the user name and password, while for others, I don't. Thus, I set the <code>SvnClient.Authentication.DefaultCredentials</code> property to an instance of my own implementation of <code>System.Net.ICredentials</code> (pseudo code):</p> <pre><code>public class MyCredentials : ICredentials { public NetworkCredential GetCredential(Uri uri, string authType) { if (AreCredentialsKnown(uri)) return new NetworkCredential("KnownUserName", "KnownPassword"); else return null; } } </code></pre> <p>This works fine for known credentials. However, if the credentials are not known, a <code>NullReferenceException</code> occurs in SharpSvn:</p> <pre><code>Object reference not set to an instance of an object. at System.Net.NetworkCredential.InternalGetUserName() at System.Net.NetworkCredential.get_UserName() at SharpSvn.Implementation.SvnCredentialWrapper.OnUserNamePassword(Object sender, SvnUserNamePasswordEventArgs e) in f:\qqn\sharpsvn-dist-1.6\src\sharpsvn\svnauthentication.h:line 619 </code></pre> <p>This is apparently caused by the fact that I return <code>null</code> from the GetCredential method. However, as is clearly stated by <a href="http://msdn.microsoft.com/en-us/library/system.net.icredentials.aspx" rel="nofollow">the MSDN documentation on the ICredentials interface</a>:</p> <blockquote> <p>The <strong>GetCredential</strong> method returns a NetworkCredential instance that contains the credentials that are associated with the specified URI and authorization scheme. When no credentials are available, the <strong>GetCredential</strong> method returns <strong>null</strong>.</p> </blockquote> <p>Is this a bug in SharpSvn? Otherwise, what am I supposed to return when the credentials are not known?</p> <p><strong>Edit:</strong> I just discovered that I can return <code>new NetworkCredentials()</code> instead of <code>null</code> to indicate to SharpSvn that the credentials are unknown. Still, I think this is a bug in SharpSvn as returning <code>null</code> should work equally well.</p>
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