我们如何将一个的WindowsIdentity 到的NetworkCredential ？我测试我的WCF服务，以验证匿名来电者将被阻止。要做到这一点，我想做的事情是这样的：

How do we convert a WindowsIdentity to a NetworkCredential? I am testing my WCF service to verify that anonymous callers are blocked. To do this I want to do something like:

myProxy.ClientCredentials.Windows.ClientCredential = foo(WindowsIdentity.GetAnonymous());

其中，富是一个能转换的WindowsIdentity 到的NetworkCredential