自定义控件不在PropertyChanged上更新 [英] Custom control not updating upon PropertyChanged

问题描述

我正在尝试自定义控件，其标题为其标题，其文本框为其InputText。控件绑定很好，但我似乎无法让它更新PropertyChanged事件。以下是我上课的方式：

  public   static   readonly  DependencyProperty HeaderProperty = DependencyProperty.Register（ < span class =code-string>标题， typeof （ string ），< span class =code-keyword> typeof （CustomControl）， new  PropertyMetadata（ null  ））; 
  public   static   readonly  DependencyProperty InputTextProperty = DependencyProperty.Register（  InputText， typeof （ string ）， typeof （CustomControl），新 FrameWorkPropertyMetadata（ null ）{BindsTwoWayByDefault =  true }）; 
 
  public   string 标题
 {
  get  { return （ string ）GetValue（HeaderProperty） ; } 
  set  {SetValue（HeaderProperty， value ;} 
} 
 
 
  public   string  InputText 
 {
 < span class =code-keyword> get  { return （ string ）GetValue（InputTextProperty） ）;} 
  set  {SetValue（InputTextProperty， value ;} 
} 

这里是ControlTemplate：

 <   StackPanel    方向  = 水平 >  
 <   TextBlock    文字  =  {Binding Header，RelativeSource = {RelativeSource TemplatedParent}}   保证金  =  0,0,10,0  /  >  
 <   TextBox    文本  =  {Binding InputText，RelativeSource = {RelativeSource TemplatedParent}}    MinWidth   =  150  /  >  
 <   / StackPanel  >  

我对控件的调用如下：

 <   local：CustomControl    标题  =  HeaderText     InputText   =   {Binding   InputString，    UpdateSourceTrigger   =   PropertyChanged /   >  

我错过了什么？

解方案

什么是你的DataContext在这里？只为DataContext对象中存在的属性实现INotifyPropertyChanged事件。

在TextBox Binding中，将UpdateSourceTrigger设置为PropertyChanged。代码如下：

 <  文本框    text   =  {Binding InputText，UpdateSourceTrigger = PropertyChanged，RelativeSource = {RelativeSource TemplatedParent}}    minwidth   =  150    /  >  

I'm trying out custom control that has a label for its header and a textbox for its InputText. The control binds fine but I can't seem toe get it to update on PropertyChanged event. Here is how I did the class:

public static readonly DependencyProperty HeaderProperty = DependencyProperty.Register("Header",typeof(string), typeof(CustomControl), new PropertyMetadata(null));
public static readonly DependencyProperty InputTextProperty = DependencyProperty.Register("InputText",typeof(string), typeof(CustomControl), new FrameWorkPropertyMetadata(null) {BindsTwoWayByDefault = true} );

public string Header
{
   get { return (string)GetValue(HeaderProperty); }
   set { SetValue(HeaderProperty,value; }
}


public string InputText
{
   get { return (string)GetValue(InputTextProperty); }
   set { SetValue(InputTextProperty,value; }
}

and here is the ControlTemplate:

<StackPanel Orientation="Horizontal">
   <TextBlock Text="{Binding Header, RelativeSource={RelativeSource TemplatedParent}}" Margin="0,0,10,0"/>
   <TextBox Text="{Binding InputText, RelativeSource={RelativeSource TemplatedParent}}" MinWidth="150"/>
</StackPanel>

my call for the control looks like this:

<local:CustomControl Header="HeaderText" InputText={Binding InputString, UpdateSourceTrigger=PropertyChanged/>

What did I miss?

解决方案

What is your DataContext here? just implement INotifyPropertyChanged event for your properties present in the DataContext object.

In TextBox Binding, set UpdateSourceTrigger to PropertyChanged. The code becomes like this:

<textbox text="{Binding InputText, UpdateSourceTrigger=PropertyChanged, RelativeSource={RelativeSource TemplatedParent}}" minwidth="150" />

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