ICallbackEventHandler

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SalamElias - 04 Apr 2006 15:12 GMT

I am implementing the ICallbackEventHandler interface, and one of its members
methods in a server control as follows :
public void RaiseCallbackEvent(string eventArgument)
    {
        if (eventArgument != "")
        {

            result += tmp1.ToString() + "), new Array(" + tmp2.ToString() + "));";
            return result;
        }
        else
        {
            return "showQueryDiv" + JS_suffixe + "('" + eventArgument + "', new
Array(), new Array());";
        }
        //throw new Exception("The method or operation is not implemented.");
    }

Yhe other method which I dont use as follows
public string GetCallbackResult()
{ }

When I compile I get the following erros

"Since 'contact_project.RaiseCallbackEvent(string)' returns void, a return
keyword must not be followed by an object expression"
and the second error
"contact_project.GetCallbackResult()': not all code paths return a value'

Thanks for your help

Reply to this Message

SalamElias - 04 Apr 2006 15:28 GMT

I forgot to say that initially, I wanted my my raise event to return a
string, when I do
public string RaiseCallbackEvent(string eventArgument)
{}
then compile, I get the following error

'contact_project' does not implement interface member
'System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent(string)'.
'add_contact_project.RaiseCallbackEvent(string)' is either static, not
public, or has the wrong return type.

Thanks again

> I am implementing the ICallbackEventHandler interface, and one of its members
> methods in a server control as follows :
[quoted text clipped - 26 lines]
>
> Thanks for your help

Reply to this Message

Steven Cheng[MSFT] - 05 Apr 2006 07:25 GMT

Hi Salam,

Thank you for posting.

Regarding on the ASP.NET 2.0 script call back issue, based on my research,
it seems a document issue. As for the ICallBackEventHandler interface, it
contains two member functions we need to implement:

#ICallbackEventHandler Methods
http://msdn2.microsoft.com/en-us/library/dcc3kkye.aspx

The "RaiseCallbackEvent" function does not have return value, so we can not
return any data in this function. If we need to return data to client-side,
we need to use the "GetCallbackResult" function. e.g:

_cbResult is a page member variable
=====================================
#region ICallbackEventHandler Members

public string GetCallbackResult()
{
return _cbResult;

}

public void RaiseCallbackEvent(string eventArgument)
{
_cbResult = eventArgument + "__" + DateTime.Now.ToLongTimeString();

}

#endregion
==============================

Hope this helps. And sorry for the inconvenience the document problem
brings you.

Regards,

Steven Cheng
Microsoft Online Community Support

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ICallbackEventHandler

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