Why am getting a CS0103 error on GetValue/SetValue, but in another class it doesn't raise that error?

Question

I'm trying to define a DependencyProperty in a viewmodel class. Here's what I've got:

public static readonly DependencyProperty SolutionIDProperty = DependencyProperty.Register("SolutionID", typeof(long), typeof(SolutionViewModel));
public long SolutionID
{
get { return (long)GetValue(SolutionIDProperty); }
set { SetValue(SolutionIDProperty, value); }
}

Both the GetValue() and SetValue() calls raise a CS0103 error. I'm including the System.Windows assembly and put a using statement at the top of the viewmodel class. GetValue() and SetValue() both are defined in DependencyObject class, which is in System.Windows. Like I said I've got the assembly referenced and included in the viewmodel's class at the top of the class.

What really confuses me is that a colleague of my is using the DependencyProperty in nearly the same way, and it works perfectly for him. Here's what he's got:

public static readonly DependencyProperty ButtonIndexProperty = DependencyProperty.Register("ButtonIndex", typeof(int), typeof(CoreButtonList));

public int ButtonIndex
{ get
{ return (int)GetValue(ButtonIndexProperty);
}
set
{ SetValue(ButtonIndexProperty, value);
}
}

His project includes the System.Windows assembly in the references, like mine does. And he's got a using statement at the code of the file, like mine done.

The only differences I can see are these:

1. The variable names are different. Mine is SolutionID and his is ButtonIndex.
2. I'm working with a C# long, he's working with a C# int.
3. I'm trying to define a DependencyProperty in a ViewModel class. He defined a DependencyProperty in the code behind of a user control.

Other than those three differences, everything else is the same. I find it incredibly hard to believe that the problem is either #1 or #2, above. Could #3 be what's causing me to get a CS0103 error when I tried to build my solution? If so, how? Or is there something else going on?

Answer 1

Probably your class (model) is not inherited from DependencyObject, in contrast with the class where these functions work.

Check some recommendations too:

• https://social.msdn.microsoft.com/Forums/vstudio/en-US/dd77102a-75e0-473c-b1e3-144a0847f4cc
• https://www.bing.com/search?q=viewmodel+dependencyobject

Answer 2

I modify your SoultionID like :

public static long GetSolutionID(DependencyObject obj)  
        {  
            return (long)obj.GetValue(SolutionIDProperty);  
        }  
  
        public static void SetSolutionID(DependencyObject obj, long value)  
        {  
            obj.SetValue(SolutionIDProperty, value);  
        }  
  
        public static readonly DependencyProperty SolutionIDProperty = DependencyProperty.Register("SolutionID", typeof(long), typeof(SolutionViewModel));  

And use it in xaml like:

      <TextBlock Width="420" Height="150" TextWrapping="Wrap" Background="Azure"  local:SolutionViewModel.SolutionID="5" ></TextBlock>  

It runs no error.

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