public static TValue GetOrException <TKey, TValue> (this IDictionary <TKey, TValue> @this, TKey key, Type exceptionType = null)
{
TValue value;
if (@this.TryGetValue(key, out value))
{
return(value);
}
else
{
throw ExceptionExts.Create(exceptionType ?? typeof(KeyNotFoundException), ErrorKeyNotFound.Fmt(key));
}
}
public static TValue GetOrException <TKey, TValue, TException> (this IDictionary <TKey, TValue> @this, TKey key)
where TException : Exception
{
TValue value;
if (@this.TryGetValue(key, out value))
{
return(value);
}
else
{
throw ExceptionExts.Create <TException>(ErrorKeyNotFound.Fmt(key));
}
}
public static T FirstOrException <T> (this IEnumerable <T> @this, Func <T, bool> predicate, Type exceptionType = null)
{
Contract.Requires <ArgumentNullException>(@this != null, "this");
Contract.Requires <ArgumentNullException>(predicate != null, "predicate");
Contract.Requires <ArgumentException>(exceptionType == null || exceptionType.Is <Exception>(), "exceptionType");
foreach (T item in @this)
{
if (predicate(item))
{
return(item);
}
}
throw ExceptionExts.Create(exceptionType ?? typeof(InvalidOperationException),
"Sequence of '{0}' contains no matching element.".Fmt(typeof(T).GetMediumName()));
}
