WPF 依赖属性返回值

发布于 2024-07-27 12:36:14 字数 362 浏览 3 评论 0原文

我对 WPF 还很陌生。

假设我定义了一个 int 依赖属性。 DP 的目的是返回值+1（参见代码）。在 .Net 2.0 中，我会这样写：

private int _myValue = 0;
    public int MyValue
    {
        get { return _myValue + 1; }
        set { _myValue = value; }
    }

How would you suggest a DP that Achieves like behavior?

提供的强制仅适用于 Set 操作。我想修改获取结果。

原文

I'm fairly new to WPF.

Suppose I defined an int dependency property. The purpose of the DP is to return the value+1 (see code).
In .Net 2.0 I would have written:

private int _myValue = 0;
    public int MyValue
    {
        get { return _myValue + 1; }
        set { _myValue = value; }
    }

How would you declare a DP that achieves similar behavior?

The Coercion that was offered works only for the Set operation. I would like to modify the Get result.

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恰似旧人归 2024-08-03 12:36:14

您可以像这样间接实现它：

public static readonly DependencyProperty ValueProperty =
    DependencyProperty.Register("Value", typeof(int), typeof(OwnerClass),
        new FrameworkPropertyMetadata(0, null, new CoerceValueCallback(CoerceValue)));

public int Value
{
    get { return (int)GetValue(ValueProperty); }
    set { SetValue(ValueProperty, value); }
}

private static object CoerceValue(DependencyObject d, object value)
{
    return (int) value + 1;
}

检查此链接有关强制的解释。

You would achieve it indirectly like this:

public static readonly DependencyProperty ValueProperty =
    DependencyProperty.Register("Value", typeof(int), typeof(OwnerClass),
        new FrameworkPropertyMetadata(0, null, new CoerceValueCallback(CoerceValue)));

public int Value
{
    get { return (int)GetValue(ValueProperty); }
    set { SetValue(ValueProperty, value); }
}

private static object CoerceValue(DependencyObject d, object value)
{
    return (int) value + 1;
}

Check this link for an explanation about coercion.

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