Is there any predefined delegate with no argument?

  • Thread starter Thread starter Dancefire
  • Start date Start date
D

Dancefire

Hi,

I am looking for a predefined delegate which in form:

delegate void NoArgument();

It's quite useful than other delegate with argument, I found
MethodInvoker in WinForms, which defined in such form, but I don't
want to add WinForm reference all the time, since my code nothing
relative the WinForm.

The reason why I use no argument delegate is quite often is that it's
quite easy to access local variable if I use anonymous methods, which
may decrease the prerequest of declare a delegate with some argument
to pass in.

For example, when I try to access WinForm in thread safe way, I
defined a static function DoThreadSafe():

private static void DoThreadSafe(Control control,
MethodInvoker function)
{
if (function != null)
{
if (control.InvokeRequired)
{
control.Invoke(function);
}
else
{
function();
}
}
}

When I use it, I do not need any parameter to pass to the "function",
such as:

value = 123;
DoThreadSafe(progressBar1, delegate
{
progressBar1.Value = value;
});

It is really easy to access the variable which is accessible in
current scope. I found many such cases which treat the delegate just a
block of code to execute without any need of argument.

I think that it's better to treat void delegate with no argument as a
special, and predefined in dotnet framework, and may be more
convinient to declare and call in the future version of C#. Is there
any existing delegate in .net framework?

Regards,
 
Dancefire said:
I am looking for a predefined delegate which in form:

delegate void NoArgument();

It's quite useful than other delegate with argument, I found
MethodInvoker in WinForms, which defined in such form, but I don't
want to add WinForm reference all the time, since my code nothing
relative the WinForm.
Click to expand...

One alternative prior to .NET 3.5 is ThreadStart. However, using that
has an implication to the reader which isn't valid unless you really
are starting a thread.

In .NET 3.5 there's the Action delegate, which has overloads by type
parameters:

void Action()
void Action<T>(T arg0)
void Action<T1,T2>(T1 arg0, T2 arg1)
etc

(In .NET 2.0 just the single-argument version is present.)
 
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