diff options
Diffstat (limited to 'src/DotNetOpenAuth.Core/Messaging/ErrorUtilities.cs')
| -rw-r--r-- | src/DotNetOpenAuth.Core/Messaging/ErrorUtilities.cs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.Core/Messaging/ErrorUtilities.cs b/src/DotNetOpenAuth.Core/Messaging/ErrorUtilities.cs index c6a652b..129a03d 100644 --- a/src/DotNetOpenAuth.Core/Messaging/ErrorUtilities.cs +++ b/src/DotNetOpenAuth.Core/Messaging/ErrorUtilities.cs @@ -6,6 +6,7 @@ namespace DotNetOpenAuth.Messaging { using System; + using System.Collections.Generic; using System.Diagnostics; using System.Diagnostics.Contracts; using System.Globalization; @@ -361,5 +362,24 @@ namespace DotNetOpenAuth.Messaging { Contract.Ensures(HttpContext.Current.Request != null); ErrorUtilities.VerifyOperation(HttpContext.Current != null && HttpContext.Current.Request != null, MessagingStrings.HttpContextRequired); } + + /// <summary> + /// Obtains a value from the dictionary if possible, or throws a <see cref="ProtocolException"/> if it's missing. + /// </summary> + /// <typeparam name="TKey">The type of key in the dictionary.</typeparam> + /// <typeparam name="TValue">The type of value in the dictionary.</typeparam> + /// <param name="dictionary">The dictionary.</param> + /// <param name="key">The key to use to look up the value.</param> + /// <param name="message">The message to claim is invalid if the key cannot be found.</param> + /// <returns>The value for the given key.</returns> + [Pure] + internal static TValue GetValueOrThrow<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key, IMessage message) { + Requires.NotNull(dictionary, "dictionary"); + Requires.NotNull(message, "message"); + + TValue value; + VerifyProtocol(dictionary.TryGetValue(key, out value), MessagingStrings.ExpectedParameterWasMissing, key, message.GetType().Name); + return value; + } } } |