public void ProviderFiltering()
{
var settings = @"<Config>
<configProtectedData>
<providers>
<add name='ClearingProvider' type='System.Configuration.RsaProtectedConfigurationProvider, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' keyContainerName='SampleKeys' useMachineContainer='true' />
<clear/>
<add name='RsaProvider' type='System.Configuration.RsaProtectedConfigurationProvider, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' keyContainerName='SampleKeys' useMachineContainer='true' />
<add name='MissedProvider' type='System.Configuration.DpapiProtectedConfigurationProvider, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' />
<add name='DpapiProvider' type='System.Configuration.DpapiProtectedConfigurationProvider, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' />
</providers>
</configProtectedData>
</Config>".ToXmlSettings().ToAppSettings();
var names = new List<string>();
var providers = new ProviderLoader()
.SubscribeLoading((s, e) =>
{
names.Add(e.Name);
if (e.Name == "MissedProvider")
e.Canceled = true;
})
.LoadAppSettings(settings)
.Providers;
CollectionAssert.AreEqual(new string[] { "ClearingProvider", "RsaProvider", "MissedProvider", "DpapiProvider" }, names);
Assert.IsNull(providers.Get("MissedProvider"));
Assert.IsNull(providers.Get("ClearingProvider"));
Assert.IsNotNull(providers.Get("RsaProvider"));
Assert.IsNotNull(providers.Get("DpapiProvider"));
}