为什么数据未绑定到我的 WPF 应用程序中的标签

Question

I am doing a simple DataBinding application in WPF . In this app whatever I type in a TextBox named txtName , should appear in the Label . For this purpose I used binding in WPF , but its not getting bound.

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="315*" />
        <ColumnDefinition Width="188*" />
    </Grid.ColumnDefinitions>

    <TextBox Height="23" HorizontalAlignment="Left"
             Margin="79,12,0,0" Name="txtName"
             VerticalAlignment="Top" Width="120" />
    <Label Height="28" HorizontalAlignment="Left"
             Margin="22,12,0,0" Name="label1"
             VerticalAlignment="Top" Width="42"
             Content="Name"/>
    <TextBox Height="23" HorizontalAlignment="Left"
             Margin="79,56,0,0" Name="txtSirName"
             VerticalAlignment="Top" Width="120" />
    <Label Content="SirName" Height="28"
           HorizontalAlignment="Left" Margin="12,56,0,0"
           Name="label2" VerticalAlignment="Top" Width="52" />
    
    <!-- Following is the label which I bound -->

    <Label Content="{Binding ElementName=txtName,Path=text}"
           Height="28" HorizontalAlignment="Left" Margin="47,112,0,0"
           Name="label3" VerticalAlignment="Top" Width="171" />
</Grid>

I am new to WPF . Please guide me.

Answer 1

Pretty sure XAML is case sensitive. Your binding path is text when it should be Text .

Answer 2

TextBox has property Text, not text. Small mistake :)

 <Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="315*"/>
        <ColumnDefinition Width="188*"/>
    </Grid.ColumnDefinitions>
    <TextBox Height="23" HorizontalAlignment="Left"
             Margin="79,12,0,0" Name="txtName"
             VerticalAlignment="Top" Width="120"/>
    <Label Height="28" HorizontalAlignment="Left"
           Margin="22,12,0,0" Name="label1" VerticalAlignment="Top"
           Width="42" Content="Name"/>
    <TextBox Height="23" HorizontalAlignment="Left"
             Margin="79,56,0,0" Name="txtSirName"
             VerticalAlignment="Top" Width="120" />
    <Label Content="SirName" Height="28" HorizontalAlignment="Left"
           Margin="12,56,0,0" Name="label2" VerticalAlignment="Top"
           Width="52" />
    <Label Content="{Binding ElementName=txtName,Path=Text}"
           Height="28" HorizontalAlignment="Left" Margin="47,112,0,0"
           Name="label3" VerticalAlignment="Top" Width="171" />
</Grid>

Answer 3

Path= *T *ext

It's a typo problem.

Answer 4

尝试这个

<Label Content="{Binding Source={x:Reference txtName}, Path=text}" Height="28" HorizontalAlignment="Left" Margin="47,112,0,0" Name="label3" VerticalAlignment="Top" Width="171" />