wpf 不包含“GetValue”的定义
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does not contain a definition for 'GetValue'
提问by user2408987
I am getting an error in the following dependency property
我在以下依赖项属性中遇到错误
Error:
错误：
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?)
不包含“GetValue”的定义，并且找不到接受第一个类型参数的扩展方法“GetValue”（您是否缺少 using 指令或程序集引用？）
My DP:
我的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);
}
}
}
}
回答by shreesha
According to msdnGetValue method Returns the current effective value of a dependency property on a dependency object.
根据msdnGetValue 方法返回依赖对象上的依赖属性的当前有效值。
for example if you create a dependency property like this
例如，如果您创建这样的依赖属性
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
您可以使用 GetValue 方法来获取 DependencyObject 的特定实例的值。请参阅以下代码
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 DependencyObjectclass before you can use GetValue method.
所以你的类必须从DependencyObject类继承，然后才能使用 GetValue 方法。
回答by thewhiteambit
Your class must inherit from DependencyObject, just change the class definition:
您的类必须从 DependencyObject 继承，只需更改类定义：
public class RadWindowProperties : DependencyObject
