CallByName in C#????

[Jelle van Baardewijk]

Does anybody know if there's way to do this in C#?

Jelle van Baardewijk

 

[Miha Markic]

Hi,

What?
Calling a method by its name?
Yes, it is possible - see reflection's MethodInfo class.

 

[Lawrence Oluyede]

Does anybody know if there's way to do this in C#?

What is "callbyname" ?

 

[phoenix]

Reflection is one way to do it, but you can also use the VB version by
simply adding a reference to the visual basic namespace.

Yves

 

[Patrick Steele [MVP]]

What is "callbyname" ?

It's from VB6. It allows you to execute methods on an object based on
the "name" of the method. It's basically late-binding, but the method
name may not be known at design-time. The code determines the method to
call and uses the CallByName function to dynamically make the call.

 

[Garrett]

Call by name has to do with the way arguments
are passed, not calling a method by it's name.

See for example:
http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?call-by-name

 

[Jon Skeet [C# MVP]]

Call by name has to do with the way arguments
are passed, not calling a method by it's name.

See for example:
http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?call-by-name

That may be true in Computer Science, but I don't believe it's what was
meant by the OP...

 

[Lawrence Oluyede]

It's from VB6. It allows you to execute methods on an object based on
the "name" of the method. It's basically late-binding, but the method
name may not be known at design-time. The code determines the method to
call and uses the CallByName function to dynamically make the call.

Yeah, thanks, it seems that reflection can handle this sort of things, right?

 

[Patrick Steele [MVP]]

Yeah, thanks, it seems that reflection can handle this sort of things, right?

Yup!

 

[Carsten Posingies]

Yup!

Just for couriousity, could you point me to an example in C#?

 

[Jon Skeet [C# MVP]]

Just for couriousity, could you point me to an example in C#?

Yup:

using System;
using System.Reflection;

class Test
{
string name;

public Test (string name)
{
this.name=name;
}

public void PrintGreeting(string other)
{
Console.WriteLine ("{0} greets {1}", name, other);
}

static void Main()
{
Test t = new Test("Jon");
MethodInfo method = typeof(Test).GetMethod("PrintGreeting");

method.Invoke (t, new object[]{"Carsten"});
}
}

 

[Carsten Posingies]

Just for couriousity, could you point me to an example in C#?
Yup:

MethodInfo method = typeof(Test).GetMethod("PrintGreeting");

method.Invoke (t, new object[]{"Carsten"});

Argh! *blush* Same as one can call a JScript's method from within C#
code when tampering with the script engine.

If there was a way to "compound" GetMethod() and Invoke(), we would have
had something similar to JScript's eval()... If there wasn't the word
"if"... <g>

Thanks!

 

[Jelle van Baardewijk]

Thnx Guys,

This is what I needed:

public static void SetControlProperty(Control control, string propertyName,
object propertyValue)
{
Type myType = control.GetType();
PropertyInfo myInfo = myType.GetProperty(propertyName);
myInfo.SetValue(control, propertyValue, null);
}

Just for couriousity, could you point me to an example in C#?
Yup:

MethodInfo method = typeof(Test).GetMethod("PrintGreeting");

method.Invoke (t, new object[]{"Carsten"});

Argh! *blush* Same as one can call a JScript's method from within C#
code when tampering with the script engine.

If there was a way to "compound" GetMethod() and Invoke(), we would have
had something similar to JScript's eval()... If there wasn't the word
"if"... <g>

Thanks!