using System.Collections.Generic; using System.Diagnostics.CodeAnalysis; namespace System.Collections { internal static class ThrowHelper { [DoesNotReturn] internal static void ThrowKeyNotFound<TKey>(TKey key) { throw new KeyNotFoundException(System.SR.Format(System.SR.Arg_KeyNotFoundWithKey, key)); } [DoesNotReturn] internal static void ThrowDuplicateKey<TKey>(TKey key) { throw new ArgumentException(System.SR.Format(System.SR.Argument_AddingDuplicate, key), "key"); } [DoesNotReturn] internal static void ThrowConcurrentOperation() { throw new InvalidOperationException(System.SR.InvalidOperation_ConcurrentOperationsNotSupported); } [DoesNotReturn] internal static void ThrowIndexArgumentOutOfRange() { throw new ArgumentOutOfRangeException("index"); } [DoesNotReturn] internal static void ThrowVersionCheckFailed() { throw new InvalidOperationException(System.SR.InvalidOperation_EnumFailedVersion); } } }