如何更新我的C#WPF绑定? [英] How to update my C# WPF binding?

问题描述

嗨 我是WPF的新手.
如您在这张图片中看到的:
http://api.ning.com/files/3FX8CRo2Q3IZ ...
我有一个过滤列表框项目的文本框.
这是我的WPF代码:

Hi I am new in WPF.
As you see in this picture:
http://api.ning.com/files/3FX8CRo2Q3IZ...
I have a textbox that filters items of listbox.
This is my WPF code:

<Grid>
    <TextBlock Height="23" HorizontalAlignment="Left" Margin="28,31,0,0" Name="textBlock1" Text="Filter Tags:" VerticalAlignment="Top" />
    <TextBox Text="{Binding Path=FilterText,Mode=TwoWay}"  Height="23" HorizontalAlignment="Left" Margin="91,28,0,0" Name="textBoxFilterTags" VerticalAlignment="Top" Width="120" TextChanged="textBoxFilterTags_TextChanged" />
    <ListBox ItemsSource="{Binding Path=Filter}"  Height="178" HorizontalAlignment="Left" Margin="12,71,0,0" Name="listBoxTags" VerticalAlignment="Top" Width="254">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <CheckBox IsChecked="{Binding Path=Tick,Mode=TwoWay}" Margin="3,1,1,1" />
                    <TextBlock Text="{Binding Path=Name}" Margin="3,1,1,1" />
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</Grid>

我的列表框绑定到一个名为:
的属性

my listbox is binded to a property called:

public ObservableCollection<tagtick> Filter
{
    get
    {
       .... // filtering based on filter text
    }
}

现在，我的问题是，当我输入过滤器文本时，列表框应更新过滤器.我尝试使用UpdateSourceTrigger，但没有成功.有人可以告诉我文本框文本更改时如何触发绑定更新吗?

预先感谢.

Now, my problem is that when I type in the filter text, the listbox should update the filter. I tried using UpdateSourceTrigger but it didnt work. can some one tell me how to trigger the binding update when the text of textbox change?

Thanks in advance.

推荐答案

建议通过代码控制此绑定，原因之一是您的ListBox的DataTemplate已更改为StackPanel的父元素. (内部有两个其他元素)和StackPanel中的TextBlock可能无法直接访问，特别是对于TwoWay绑定，如果不进行代码强制转换的话.我建议您通过代码而不是XAML进行过滤.

It''s advisable to control this binding through code, one reason being that the DataTemplate of your ListBox have changed to a parent element of StackPanel(with two other element inside) and the TextBlock inside the StackPanel may not be directly accessible especially for a TwoWay Binding without doing some casting in code. I suggest that you do your filtering through code and not XAML.

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