WPF 利用元素绑定实现在一个窗口更新另一个窗口中Label的Content

柔情只为你懂 2022-05-25 09:40 172阅读 0赞

首先创建一个数据类，我在里面放了一个string类型的counter

public class Data: INotifyPropertyChanged
        {
            public event PropertyChangedEventHandler PropertyChanged;
    
            private string counter;
            public string Counter
            {
                get { return counter; }
                set
                {
                    //值改变
                    if (counter != value)
                    {
                        counter = value;
                        //触发改变事件
                        if (PropertyChanged != null)
                        {
                            //通知前台UI更新
                            PropertyChanged(this,new PropertyChangedEventArgs("Counter"));
                        }
                    }
    
                }
            }
        }

然后在前台绑定,我把Label的Content和counter绑定，这样当counter的值有所变化是，label.Content也会跟着一起变

<Window.Resources>
            <local:Data x:Key="LabelData"/>
        </Window.Resources>
        <Grid DataContext="{StaticResource ResourceKey=LabelData}">
            <Label x:Name="label" Content="{Binding Path=Counter}" HorizontalAlignment="Left"  Margin="150,20,30,40" VerticalAlignment="Center"/>
            <Label x:Name="label1" Content="Counter:" HorizontalAlignment="Left" Margin="50,20,30,40" VerticalAlignment="Center"/>
        </Grid>

![70][]

点击Main Window的Start按钮后，后台的countr就开始自增，Timer的Counter的值也会随着counter的改变而改变。

Demo:

[WPFElementBindingDemo ][WPFElementBindingDemo]

[70]: /images/20220525/6e2119fa482f4026a144ac9b27d11e1a.png
[WPFElementBindingDemo]: https://download.csdn.net/download/hk_jy/10409164