Casting RadioButtonList

[sck10]

Hello,

I am converting some code from VB to C# and ran into a conversion error:

Cannot implicitly convert type 'object' to
'System.Web.UI.WebControls.RadioButtonList'. An explicit conversion exists
(are you missing a cast?)

Any help with this would be appreciated...

sck10



VB
======
Protected Sub rblApprovalStatus_DataBinding(ByVal sender As Object, ByVal e
As EventArgs)
Dim rlist As RadioButtonList = sender
End Sub


C#
=======
protected void rblApprovalStatus_DataBinding(object sender, EventArgs e)
{
RadioButtonList rlist = sender;
}

Error Statement

 

[Guest]

In c# you need to explicity cast from type to another. Try this:

protected void rblApprovalStatus_DataBinding(object sender, EventArgs e)
{
RadioButtonList rlist = (RadioButtonList) sender;
}

Jason Vermillion

 

[Steven Cheng[MSFT]]

Hi Steve,

As Jason has mentioned, in C# it always force you to use explicit object
cast and won't let VB style late bind code. For you scenario, you need to
explicitly cast the "sender" to the RadioButtonList control instance.

In addition to the following style cast:

RadioButtonList rlist = (RadioButtonList) sender;

you can also use the "as" keyword to do type casting in C# which can avoid
invalid cast exception when the type mismatches. e.g.

RadioButtonList list = sender as RadioButtonList;

if(list != null)
{
//do .....
}


Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.

 

[sck10]

Thanks Jason,

sck10

In c# you need to explicity cast from type to another. Try this:

protected void rblApprovalStatus_DataBinding(object sender, EventArgs
e)
{
RadioButtonList rlist = (RadioButtonList) sender;
}

Jason Vermillion

 

[sck10]

Thanks for the further explanation Steven,

sck10