Cannot convert lambda expression of type System.delegate becauseit is not a delegate type

[Satish]

When i compile this function I get the error Cannot convert lambda
expression of type System.delegate because it is not a delegate type.

private void SetStatus(strin g status)
{
if (this.InvokeReq uired)
{
this.Invoke( status =SetStatus(stat us));
}
else
{
toolStripStatus Label1.Text = status;
}
}

Is it not possible to use the lambda expression in this case? Do I have
to declare a delegate and use it like the old way?

[Martin Honnen]

Re: Cannot convert lambda expression of type System.delegate becauseit is not a delegate type

Satish wrote:

>
When i compile this function I get the error Cannot convert lambda
expression of type System.delegate because it is not a delegate type.
>
private void SetStatus(strin g status)
{
if (this.InvokeReq uired)
{
this.Invoke( status =SetStatus(stat us));

What type is 'this'? How does the signature of 'Invoke' look?

--

Martin Honnen --- MVP XML

http://JavaScript.FAQTs.com/

[Satish]

Re: Cannot convert lambda expression of type System.delegate becauseit is not a delegate type

The code is on a windows Form so this is System.Windows. Form. My
intention is to update the status bar on the Form from a background thread.

Martin Honnen wrote:

Satish wrote:

> When i compile this function I get the error Cannot convert
>lambda expression of type System.delegate because it is not a delegate
>type.
>>
>private void SetStatus(strin g status)
>{
> if (this.InvokeReq uired)
> {
> this.Invoke( status =SetStatus(stat us));

>
What type is 'this'? How does the signature of 'Invoke' look?
>

[Marc Gravell]

Re: Cannot convert lambda expression of type System.delegate becauseit is not a delegate type

First - both lambdas and anonymous method must be typed; in this case,
MethodInvoker or Action is the easiest...

You'd probably find that this works:

this.Invoke((Ac tion) (() =SetStatus(stat us)));

But to be honest, it is just as easy to use anon-methods here:

this.Invoke((Ac tion) delegate {SetStatus(stat us);});

[Marc Gravell]

Re: Cannot convert lambda expression of type System.delegate becauseit is not a delegate type

And a third syntax:

this.Invoke((Ac tion<string>)Se tStatus, status);

i.e.
treat SetStatus as a void method that accepts a string, and invoke it,
passing /status/ as the arg.

Marc

[Satish]

Re: Cannot convert lambda expression of type System.delegate becauseit is not a delegate type

Thanks it worked!!

Marc Gravell wrote:

And a third syntax:
>
this.Invoke((Ac tion<string>)Se tStatus, status);
>
i.e.
treat SetStatus as a void method that accepts a string, and invoke it,
passing /status/ as the arg.
>
Marc