Beispiel #1
0
        private static MethodCallExpression CountDistinctExpression(ParameterExpression sourceParameter, LambdaExpression lambda)
        {
            MethodInfo           selectMetodInfo = OeMethodInfoHelper.GetSelectMethodInfo(lambda.Parameters[0].Type, lambda.ReturnType);
            MethodCallExpression selectCall      = Expression.Call(selectMetodInfo, sourceParameter, lambda);

            MethodInfo           distinctMethodInfo = OeMethodInfoHelper.GetDistinctMethodInfo(lambda.ReturnType);
            MethodCallExpression distinctCall       = Expression.Call(distinctMethodInfo, selectCall);

            MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(lambda.ReturnType);

            return(Expression.Call(countMethodInfo, distinctCall));
        }