Passing a delegate to a function

[Dom]

Let's say I do this:

MyObject o = new MyObject (this, DoWork);

.... where DoThis is a function in the calling class. How do I pick
this up in the constructor, MyObject?

public MyObject (Form OriginatingForm, <???ptrDoWork)
OriginatingForm.Invoke (ptrDoWork)
How do I replace <???>.

Dom

[Nicholas Paldino [.NET/C# MVP]]

Dom,

Well, you have to have a delegate defined. It looks like it has no
parameters, and no return value, so you can define a delegate like so:

public void DoSomething();

Then, your constructor would be defined as:

public MyObject(Form originatingForm, DoSomething doSomething)
{
OriginatingForm.Invoke(doSomething);
}

Although if you know the object is going to be constructed on the UI
thread, then you can just do:

public MyObject(Form originatingForm, DoSomething doSomething)
{
doSomething();
}
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Dom" <do********@gmail.comwrote in message
news:11**********************@o5g2000hsb.googlegro ups.com...

Let's say I do this:

MyObject o = new MyObject (this, DoWork);

... where DoThis is a function in the calling class. How do I pick
this up in the constructor, MyObject?

public MyObject (Form OriginatingForm, <???ptrDoWork)
OriginatingForm.Invoke (ptrDoWork)
How do I replace <???>.

Dom

[sloan]

HEre is a good article.

http://msdn.microsoft.com/msdnmag/issues/04/05/C20/
Nicholas,

Wouldn't it be

delegate void DoSomething();
?

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.comwrote in
message news:24**********************************@microsof t.com...

Dom,

Well, you have to have a delegate defined. It looks like it has no
parameters, and no return value, so you can define a delegate like so:

public void DoSomething();

Then, your constructor would be defined as:

public MyObject(Form originatingForm, DoSomething doSomething)
{
OriginatingForm.Invoke(doSomething);
}

Although if you know the object is going to be constructed on the UI
thread, then you can just do:

public MyObject(Form originatingForm, DoSomething doSomething)
{
doSomething();
}
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Dom" <do********@gmail.comwrote in message
news:11**********************@o5g2000hsb.googlegro ups.com...

Let's say I do this:

MyObject o = new MyObject (this, DoWork);

... where DoThis is a function in the calling class. How do I pick
this up in the constructor, MyObject?

public MyObject (Form OriginatingForm, <???ptrDoWork)
OriginatingForm.Invoke (ptrDoWork)
How do I replace <???>.

Dom

[Nicholas Paldino [.NET/C# MVP]]

Yes, forgot the delegate keyword. Thanks for the catch.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"sloan" <sl***@ipass.netwrote in message
news:OL**************@TK2MSFTNGP06.phx.gbl...

>

HEre is a good article.

http://msdn.microsoft.com/msdnmag/issues/04/05/C20/
Nicholas,

Wouldn't it be

delegate void DoSomething();
?

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.comwrote
in
message news:24**********************************@microsof t.com...

>Dom,

Well, you have to have a delegate defined. It looks like it has no
parameters, and no return value, so you can define a delegate like so:

public void DoSomething();

Then, your constructor would be defined as:

public MyObject(Form originatingForm, DoSomething doSomething)
{
OriginatingForm.Invoke(doSomething);
}

Although if you know the object is going to be constructed on the UI
thread, then you can just do:

public MyObject(Form originatingForm, DoSomething doSomething)
{
doSomething();
}
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Dom" <do********@gmail.comwrote in message
news:11**********************@o5g2000hsb.googlegr oups.com...

Let's say I do this:

MyObject o = new MyObject (this, DoWork);

... where DoThis is a function in the calling class. How do I pick
this up in the constructor, MyObject?

public MyObject (Form OriginatingForm, <???ptrDoWork)
OriginatingForm.Invoke (ptrDoWork)
How do I replace <???>.

Dom

[Jon Skeet [C# MVP]]

Nicholas Paldino [.NET/C# MVP] <mv*@spam.guard.caspershouse.comwrote:

Well, you have to have a delegate defined. It looks like it has no
parameters, and no return value, so you can define a delegate like so:

public void DoSomething();

Correction to typo - to declare the delegate type, you need:

public delegate void DoSomething();

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[james]

MyObject o = new MyObject (this, DoWork);

... where DoThis is a function in the calling class. How do I pick
this up in the constructor, MyObject?

OriginatingForm is redundant because the DoWork stored a reference to
OriginatingForm when it was created. Delegate's have to reference a
class instance when pointing to an instance method. Then you can
call:

((Form)DoWork.Target).Invoke(DoWork);