Cannot use DialogResult

Question

I tried to use DialogResult to check an Messagebox's YesNoCancel. I'm using the following code which I don't see any problem with:

DialogResult dlgResult = MessageBox.Show(
   "Save changes before closing?", 
   "Warning", 
   MessageBoxButton.YesNoCancel, 
   MessageBoxImage.Question);

But Visual Studio throws me error saying

'System.Windows.Window.DialogResult' is a 'property' but is used like a 'type'

Answer 1

There is a confliction here between the DialogResult Enumeration and the Window.DialogResult Property.

To solve this problem, you can use the fully qualified name of the enumuration. As the following:

System.Windows.Forms.DialogResult dlgResult = ...

However, since you are using WPF, use MessageBoxResult Enumeration to get the result of the message:

MessageBoxResult result = 
    MessageBox.Show("Would you like to see the simple version?", 
    "MessageBox Example", MessageBoxButton.OKCancel);

Answer 2

The problem is DialogResult is also a property of the form and the compiler thinks you are refering to this property.

You have several choices here:

• Use the fully qualified name of the type System.Windows.Forms.DialogResult
• Use var to let the compiler figure out the type and get rid of the name collision

Answer 3

DialogResult is not a type, its a property, you want the type MessageBoxResult

I can see from the question you are not using winforms. So the code would read,

MessageBoxResult result = MessageBox.Show(
    "Save changes before closing?",
    "Warning",     
    MessageBoxButton.YesNoCancel,
    MessageBoxImage.Question);

Answer 4

Try to declare dlgResult as var. Then it should work

    var dlgResult = 
        MessageBox.Show("Save changes before closing?", 
            "Warning", MessageBoxButton.YesNoCancel, MessageBoxImage.Question);

Also MessageBox.Show under WPF does return MessageBoxResult and not DialogResult. DialogResult is used in WindowsForms.