public static MethodCallExpression WrapInAverageSum(this MethodCallExpression node, MethodCallExpression wrap)
{
Check.NotNull(node, nameof(node));
Check.NotNull(wrap, nameof(wrap));
Type selectorType = wrap.GetSelectorType();
Type queryableType = typeof(IQueryable <>).MakeGenericType(selectorType);
MethodInfo numberMethod = typeof(Queryable).GetMethod(wrap.Method.Name, new [] { queryableType });
return(Expression.Call(numberMethod, node));
}
public static MethodCallExpression WrapInSelect(this MethodCallExpression node, MethodCallExpression selectorNode)
{
Check.NotNull(node, nameof(node));
Type selectorType = selectorNode.GetSelectorType();
Type[] genericArgumentTypes = node.Method
.GetGenericArguments()
.Append(selectorType)
.ToArray();
return(Expression.Call(typeof(Queryable), nameof(Queryable.Select), genericArgumentTypes, node, selectorNode.Arguments[1]));
}
