Question

我有一个用于viewcontrol的viewmodel，它在viewmodel的数据模板中定义。我想将usercontrol的'GridViewData'属性绑定到viewmodel的'Data'属性。

我还是WPF的新手并且在绑定方面很糟糕，所以请善待：p

XAML：

<Window x:Class="ReportUtility.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:lite="clr-namespace:ReportUtility.Controls.LiteGrid"
    xmlns:vm="clr-namespace:ReportUtility.ViewModels"
    xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
    Title="MainWindow" Height="350" Width="525">

<!--This is the view model I want to bind to variable name is Grid: hosted in the content control below-->
<Window.Resources>
    <DataTemplate DataType="{x:Type vm:LiteGridViewModel}">
        <lite:LiteGrid GridViewData="{Binding ??}"/>
    </DataTemplate>
</Window.Resources>

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="auto"/>
        <RowDefinition Height="50"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition/>
        <ColumnDefinition Width="150"/>
    </Grid.ColumnDefinitions>

    <Button Grid.Row="0" Content="TestButton" HorizontalAlignment="Stretch" Command="{Binding ExecuteQueryCommand}"/>
    <TextBox Grid.Row="1" Text="{Binding Path=SqlCommandText, UpdateSourceTrigger=PropertyChanged}"/>
    <ContentControl Content="{Binding Grid}" Grid.Row="2" Background="Red"/>

    <Border Background="Aqua" Grid.Column="1" Grid.RowSpan="3"/>
    <GridSplitter Grid.Column="0" Width="3" Grid.RowSpan="3"/>
</Grid>

Answer 1

您将绑定到Data

<DataTemplate DataType="{x:Type vm:LiteGridViewModel}">
    <lite:LiteGrid GridViewData="{Binding Data}"/>
</DataTemplate>

在LiteGrid UserControl中执行此绑定甚至更好，而不是依赖于使用该控件设置值的XAML。

<UserControl GridViewData="{Binding Data}">
    ...
</UserControl>

您的绑定始终引用当前对象的DataContext。由于DataTemplate适用于LiteGridViewModel类型，因此DataContext中的DataTemplate始终属于LiteGridViewModel类型。

例如，如果您有类似

的类

public class MyClassA
{
    MyClassB ClassB {get; set;}
}

public class MyClassB 
{
    MyClassC ClassC {get; set;}
}

ViewModel属性MyClassA ClassA（意思是你可以引用ClassA.ClassB.ClassC），你可以做类似的事情

<ContentControl Content="{Binding ClassA}">
    <ContentControl Content="{Binding ClassB}"> <!-- DataContext is MyClassA -->
        <ContentControl Content="{Binding ClassC}"> <!-- DataContext is MyClassB -->
            <!-- DataContext is MyClassC -->
        </ContentControl>
    </ContentControl>
</ContentControl>

绑定多个视图模型

1 个答案: