在TextBlock的绑定不工作WPF [英] Binding in TextBlock doesn't work in WPF

问题描述

我要改变我的类TextBlock的动态文本。我做了所有的事情，但它不正常工作。
XAML的代码：

i want to change dynamically text of a TextBlock in my Class. i did all thing but it doesnt work properly. XAML-Code:

<TextBlock Name="Footer_text"  Text=""/>

在C＃中：

       string footerMainMenuText = "Setting";
       Binding  set = new Binding("");
       set.Mode = BindingMode.OneWay;
       set.Source = footerMainMenuText;
       Footer_text.DataContext = footerMainMenuText;
       Footer_text.SetBinding(TextBlock.TextProperty, set);

我检查最后一行，并Footer_text.Text是否设置正确。（Footer_text.Text =设置），但TextBlock的在我的应用程序犯规秀设置。这里有什么问题吗？谢谢

i checked last line, and the Footer_text.Text is set correctly.( Footer_text.Text="Setting"), but TextBlock in my application doesnt show "Setting". what is the problem here? thanks

推荐答案

如果你要绑定 - 为什么不只是做在XAML中呢？看你的代码，这是一种毫无意义的 - 你可能也只是去

If you are binding - why not just do it in XAML instead? Looking at your code it's kind of pointless - you might as well just go

Footer_text.Text = "Setting";

您最好应做到在XAML，或至少提供的东西为它绑定到

You should ideally do it in XAML or at least provide something for it to bind to

<TextBlock Text="{Binding SomeProperty}" />

我不知道为什么你会在它自己的绑定'字符串'到什么...你有哪些需要绑定到文本属性的对象？

I'm not sure why you would bind a 'string' on it's own to anything...do you have an object which you need to bind to the text property?

同时使用

Binding("")

这是什么呢？一个空白的路径？不知道是什么的约束性目标会在那里......你试过

What does that do? A blank path? Not sure what the binding target would be there... have you tried

Binding()

而不是

编辑：

此外，为什么你的绑定更新不及时的控制的原因，可能是因为你还没有绑定到哪个实现INotifyPropertyChanged或类似的接口的对象。这些控件需要知道什么时候改变过，所以我会想象，结合串不给TextBlock的正确通知时，它改变了

Also the reason why your binding is not updating the control, is probably because you haven't bound to an object which implements INotifyPropertyChanged or a similar interface. The controls need to know when values have changed, so I'd imagine that binding to 'string' isn't giving the TextBlock the proper notification when it changes

编辑2

下面是结合工作的一个简单的例子：

Here is a quick example of binding working:

我的窗口类Window.cs：

My window class Window.cs:

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel>
        <TextBlock x:Name="txtName" Text="{Binding Name}"></TextBlock>
            <Button Click="Button_Click">Click me 1</Button>
            <Button Click="Button_Click_1">Click me 2</Button>
        </StackPanel>
    </Grid>
</Window>

在Window.xaml.cs后面的代码

The code behind in Window.xaml.cs

public partial class MainWindow : Window
{
    SomeObjectClass obj = new SomeObjectClass();
    public MainWindow()
    {
        InitializeComponent();

        txtName.DataContext = obj;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        obj.Name = "Hello World";
    }

    private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        obj.Name = "Goobye World";
    }
}

对象绑定到（与INotifyPropertyChanged的）

The object to bind to (with INotifyPropertyChanged)

class SomeObjectClass : INotifyPropertyChanged
{
    private string _name = "hello";
    public string Name
    {
        get
        {
            return _name;
        }
        set
        {
            _name = value;
            OnPropertyChanged("Name");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(string PropertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
    }
}

点击按钮改变SomeObject.Name，但它更新文本框。

Clicking the buttons changes SomeObject.Name, but it updates the textbox.

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