WPF 绑定不起作用
我很确定我正在做一些严重错误的事情,但无法弄清楚。
我围绕一个类创建了一个简单的包装器,并添加了一个依赖属性,以便我可以绑定到它。然而,绑定没有给出错误,但什么也不做。
为了简化事情,我将类更改为 TextBox,并得到了相同的结果。
public class TextEditor : TextBox
{
#region Public Properties
#region EditorText
/// <summary>
/// Gets or sets the text of the editor
/// </summary>
public string EditorText
{
get
{
return (string)GetValue(EditorTextProperty);
}
set
{
//if (ValidateEditorText(value) == false) return;
if (EditorText != value)
{
SetValue(EditorTextProperty, value);
base.Text = value;
//if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("EditorText"));
}
}
}
public static readonly DependencyProperty EditorTextProperty =
DependencyProperty.Register("EditorText", typeof(string), typeof(TextEditor));
#endregion
#endregion
#region Constructors
public TextEditor()
{
//Attach to the text changed event
//TextChanged += new EventHandler(TextEditor_TextChanged);
}
#endregion
#region Event Handlers
private void TextEditor_TextChanged(object sender, EventArgs e)
{
EditorText = base.Text;
}
#endregion
}
当我运行以下 XAML 时,第一个给出结果,但第二个 (EditorText) 甚至没有命中 EditorText 属性。
<local:TextEditor IsReadOnly="True" Text="{Binding Path=RuleValue, Mode=TwoWay}" WordWrap="True" />
<local:TextEditor IsReadOnly="True" EditorText="{Binding Path=RuleValue, Mode=TwoWay}" WordWrap="True" />
I am pretty sure I am doing something dreadfully wrong, but can't figure it out.
I created a simple wrapper around a class and added a dependency property so I could bind to it. However, the binding gives no errors, but does nothing.
In order to simplify things I changed the class to TextBox, and got the same results.
public class TextEditor : TextBox
{
#region Public Properties
#region EditorText
/// <summary>
/// Gets or sets the text of the editor
/// </summary>
public string EditorText
{
get
{
return (string)GetValue(EditorTextProperty);
}
set
{
//if (ValidateEditorText(value) == false) return;
if (EditorText != value)
{
SetValue(EditorTextProperty, value);
base.Text = value;
//if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("EditorText"));
}
}
}
public static readonly DependencyProperty EditorTextProperty =
DependencyProperty.Register("EditorText", typeof(string), typeof(TextEditor));
#endregion
#endregion
#region Constructors
public TextEditor()
{
//Attach to the text changed event
//TextChanged += new EventHandler(TextEditor_TextChanged);
}
#endregion
#region Event Handlers
private void TextEditor_TextChanged(object sender, EventArgs e)
{
EditorText = base.Text;
}
#endregion
}
When I run the following XAML the first gives results, but the second one (EditorText) doesn't even hit the EditorText property.
<local:TextEditor IsReadOnly="True" Text="{Binding Path=RuleValue, Mode=TwoWay}" WordWrap="True" />
<local:TextEditor IsReadOnly="True" EditorText="{Binding Path=RuleValue, Mode=TwoWay}" WordWrap="True" />
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您正在 CLR 属性中做额外的工作。无法保证 WPF 将使用您的 CLR 属性,因此您不应该这样做。相反,在 DP 上使用元数据可以达到相同的效果。
You're doing extra work in your CLR property. There is no guarantee that your CLR property will be used by WPF so you shouldn't be doing this. Instead, use metadata on your DP to achieve the same effect.