bool ICollection <TKey> .Remove(TKey item)
 {
     ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_KeyCollectionSet);
     return(false);
 }
 void ICollection <TKey> .Clear()
 {
     ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_KeyCollectionSet);
 }
 bool ICollection <TValue> .Remove(TValue item)
 {
     ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ValueCollectionSet);
     return(false);
 }
 void ICollection <TKey> .Add(TKey item)
 {
     ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_KeyCollectionSet);
 }
 void ICollection <TValue> .Clear()
 {
     ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ValueCollectionSet);
 }