CODEWITHSUNDEEP
c#wpfc#-4.0wpf-controlsdependency-properties
user2408987
user2408987

Reputation: 101

does not contain a definition for 'GetValue'

I am getting an error in the following dependency property

Error:

Does not contain a definition for 'GetValue' and no extension method 'GetValue' accepting a first argument of type could be found (are you missing a using directive or an assembly reference?)

My DP:

using System;
using System.Linq;
using System.Windows;

namespace NameSpace
{
   public class RadWindowProperties
    {
       public static readonly DependencyProperty ScreenSubtitleProperty = DependencyProperty.Register("ScreenSubtitle", typeof(string), typeof(RadWindowProperties), new PropertyMetadata(String.Empty));

       public string ScreenSubtitle
       {
           get
           {
               return (string)this.GetValue(ScreenSubtitleProperty);
           }
           set
           {
               this.SetValue(ScreenSubtitleProperty, value);
           }
       }
    }
}

Upvotes: 0

Views: 8097

Answers (2)

thewhiteambit
thewhiteambit

Reputation: 1436

Your class must inherit from DependencyObject, just change the class definition:

public class RadWindowProperties : DependencyObject

Upvotes: 3

shreesha
shreesha

Reputation: 1881

According to msdn GetValue method Returns the current effective value of a dependency property on a dependency object.

for example if you create a dependency property like this

public static readonly DependencyProperty BoundPasswordProperty =
                DependencyProperty.RegisterAttached("BoundPassword", typeof(string), typeof(PasswordBoxAssistant), new PropertyMetadata(string.Empty, OnBoundPasswordChanged));

You can use GetValue method to get the value of particular instance of DependencyObject.see the below code

    private static void OnBoundPasswordChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
                {
                    PasswordBox box = d as PasswordBox;
                    string strValue=GetBoundPassword(d);
    }

public static string GetBoundPassword(DependencyObject dp)
            {
                return (string)dp.GetValue(BoundPasswordProperty);
            }

so your class must inherit from DependencyObject class before you can use GetValue method.

Upvotes: 2

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