Get MethodInfo of String.TrimStart with reflection?

Question

I gonna get MethodInfo of String.TrimStart()
The following code returns null.

typeof(string).GetMethod("TrimStart", new Type[ ] {});

and the following code returns {System.String TrimStart(Char[])}

typeof(string).GetMethod("TrimStart", BindingFlags.Public | BindingFlags.Instance);

I wanna get {System.String TrimStart()} exactly ?

`TrimStart(Char[])` is the only available method. http://msdn.microsoft.com/en-us/library/system.string.trimstart — leppie, Dec 17 '14 at 07:39
Didn't you ask something similar before or do I have a deja vu? — Dion V., Dec 17 '14 at 07:41
Another question: Why would you want to invoke a known method. — leppie, Dec 17 '14 at 07:44
I wanna create an entity framework expression, so I need to use reflection to get TrimStart — Mohammad Dayyan, Dec 17 '14 at 07:45

score 3 · Accepted Answer · edited Dec 17 '14 at 08:04

3

There is no String.TrimStart() method.

There is only String.TrimStart(params Char[] source) overload. You can invoke it without any paramteres thanks to params keyword.

In other words: String.TrimStart() "invokes" String.TrimStart(new char[0]).

edited Dec 17 '14 at 08:04

Marc Selis

answered Dec 17 '14 at 07:41

Could you please post ot link to how call `TrimStart` with expression? – Mohammad Dayyan Dec 17 '14 at 07:57
2

Here is link: http://msdn.microsoft.com/en-us/library/dd323922(v=vs.110).aspx First arg is `MethodInfo`. Collection of `Expression` in the second argument should hold one item - expression, that after compile returns `char[]`. It could be `Expression.Constant(new char[0])`. – Dec 17 '14 at 08:08

1 Answers1