无法识别 WPF 依赖属性
我正在尝试克服不允许我绑定到常规 clr 属性的限制。
我使用的解决方案使用自定义依赖项属性,这些属性又会更改 clr 属性。
这是代码,
class BindableTextBox : TextBox
{
public static readonly DependencyProperty BoundSelectionStartProperty = DependencyProperty.Register("BoundSelctionStart", typeof(int), typeof(BindableTextBox),
new PropertyMetadata(new PropertyChangedCallback(BindableTextBox.onBoundSelectionStartChanged)));
private static void onBoundSelectionStartChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((TextBox)d).SelectionStart = (int)e.NewValue;
}
private static readonly DependencyProperty BoundSelectionLenghtProperty = DependencyProperty.Register("BoundSelectionLenght", typeof(int), typeof(BindableTextBox),
new PropertyMetadata(new PropertyChangedCallback(BindableTextBox.onBoundSelectionLenghtChanged)));
private static void onBoundSelectionLenghtChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((TextBox)d).SelectionLength = (int)e.NewValue;
}
public int BoundSelectionStart
{
get { return (int)GetValue(BoundSelectionStartProperty); }
set { SetValue(BoundSelectionStartProperty, value); }
}
public int BoundSelectionLenght
{
get { return (int)GetValue(BoundSelectionLenghtProperty); }
set { SetValue(BoundSelectionLenghtProperty, value); }
}
}
但是当我尝试将某些内容绑定到 BoundSelectionStart 时,它说我只能绑定到 DP。
<bindable:BindableTextBox Text="{Binding Name}" BoundSelectionStart="{Binding ElementName=slider1, Path=Value}" />
问题是什么?
I'm trying to overcome a limitation that doesn't allow me to bind to regular clr properties.
The solution I use uses custom dependency properties that in turn changes clr properties.
Here is the code
class BindableTextBox : TextBox
{
public static readonly DependencyProperty BoundSelectionStartProperty = DependencyProperty.Register("BoundSelctionStart", typeof(int), typeof(BindableTextBox),
new PropertyMetadata(new PropertyChangedCallback(BindableTextBox.onBoundSelectionStartChanged)));
private static void onBoundSelectionStartChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((TextBox)d).SelectionStart = (int)e.NewValue;
}
private static readonly DependencyProperty BoundSelectionLenghtProperty = DependencyProperty.Register("BoundSelectionLenght", typeof(int), typeof(BindableTextBox),
new PropertyMetadata(new PropertyChangedCallback(BindableTextBox.onBoundSelectionLenghtChanged)));
private static void onBoundSelectionLenghtChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((TextBox)d).SelectionLength = (int)e.NewValue;
}
public int BoundSelectionStart
{
get { return (int)GetValue(BoundSelectionStartProperty); }
set { SetValue(BoundSelectionStartProperty, value); }
}
public int BoundSelectionLenght
{
get { return (int)GetValue(BoundSelectionLenghtProperty); }
set { SetValue(BoundSelectionLenghtProperty, value); }
}
}
But when I try to bound something to BoundSelectionStart it says it says that I can only bind to DP.
<bindable:BindableTextBox Text="{Binding Name}" BoundSelectionStart="{Binding ElementName=slider1, Path=Value}" />
What is the problem?
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您在该行中有一个拼写错误:
第一个参数应该是“BoundSelectionStart”(Selection 中的 2x e),而不是“BoundSelctionStart”。
You have a typo in the line:
The first parameter should be "BoundSelectionStart" (2x e in Selection), not "BoundSelctionStart".