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Jon Cage
Jon Cage

Reputation: 37500

Why does DialogResult::Yes require a ::?

Why does this work:

using namespace System;
using namespace System::Windows::Forms;
...
if( MessageBox::Show("Really do it?", "Are you sure?", System::Windows::Forms::MessageBoxButtons::YesNo) == System::Windows::Forms::DialogResult::Yes )
{
    Console::WriteLine("Do it!");
}

..when this fails:

using namespace System;
using namespace System::Windows::Forms;
...
if( MessageBox::Show("Really do it?", "Are you sure?", System::Windows::Forms::MessageBoxButtons::YesNo) == DialogResult::Yes )
{
    Console::WriteLine("Do it!");
}

...with the following error:

error C2039: 'Yes' : is not a member of 'System::Windows::Forms::Form::DialogResult'

I'm assuming Visual Studio is picking up DialogResult but I can't see where it's finding it?

Upvotes: 3

Views: 3077

Answers (2)

Niko
Niko

Reputation: 26730

System::Windows::Forms::Form has a property also called DialogResult (being of type System::Windows::Forms::DialogResult), hence the error.

http://msdn.microsoft.com/library/system.windows.forms.form.dialogresult.aspx

http://msdn.microsoft.com/library/system.windows.forms.dialogresult.aspx

Upvotes: 3

Jeff Watkins
Jeff Watkins

Reputation: 6359

It's a naming collision, Form.DialogResult is a property of Form. See here. I assume your code is part of a Form and thus that takes precedence.

Upvotes: 3

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