Question

我有一个usercontrol，我想在列表框中用作DataTemplate。

这有效：

<ListBox>
    <ListBox.ItemTemplate>
        <DataTemplate>
<Grid x:Name="Grid" Height="100" Width="880" Background="LightGray">
    <Grid.RowDefinitions>
        <RowDefinition Height="24"/>
        <RowDefinition Height="24"/>
        <RowDefinition Height="24"/>
        <RowDefinition Height="24"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="190" />
        <ColumnDefinition Width="100" />
        <ColumnDefinition Width="100" />
        <ColumnDefinition Width="100" />
        <ColumnDefinition Width="190" />
        <ColumnDefinition Width="200" />
    </Grid.ColumnDefinitions>
    <Label Grid.Column="0" Grid.Row="0">Client</Label>
    <Label Grid.Column="0" Grid.Row="2">Contact</Label>
    <Label Grid.Column="1" Grid.Row="0">Date Presentation</Label>
    <Label Grid.Column="2" Grid.Row="0">Action</Label>
    <Label Grid.Column="3" Grid.Row="0">Date Interview</Label>
    <Label Grid.Column="3" Grid.Row="2">Time Interview</Label>
    <Label Grid.Column="4" Grid.Row="0">Remarks</Label>
    <Label Grid.Column="5" Margin="0,0,2,0">managed by</Label>
    <ComboBox Grid.Column="0" Grid.Row="1" Margin="2" Text="{Binding Path=Customer}">
        <!--Template-->
    </ComboBox>
    <TextBox Grid.Column="0" Grid.Row="3" Margin="2" Text="{Binding Path=Contact}"></TextBox>
    <TextBox Grid.Column="1" Grid.Row="1" Margin="2" Text="{Binding Path=PresentationDate}"></TextBox>
    <ComboBox Grid.Column="2" Grid.Row="1" Margin="2" Text="{Binding Path=Action}">
        <!--Template-->
    </ComboBox>
    <TextBox Grid.Column="3" Grid.Row="1" Margin="2" Text="{Binding Path=InterviewDate}"></TextBox>
    <TextBox Grid.Column="3" Grid.Row="3" Margin="2" Text="{Binding Path=InterviewTime}"></TextBox>
    <TextBox Grid.Column="4" Grid.Row="1" Grid.RowSpan="3" Margin="2" Text="{Binding Path=Remarks}"></TextBox>
    <StackPanel Orientation="Horizontal" Grid.Column="5" Grid.Row="1" >
        <ComboBox Width="124" Text="{Binding Path=Manager}" Margin="2"></ComboBox>
        <Button Width="60" Height="20" Margin="4,0,0,0" >Mail</Button>
    </StackPanel>
    <CheckBox Grid.Column="5" Grid.Row="3" Margin="2,2,4,2">Rejection communicated</CheckBox>
   </Grid>
       </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

如果我在<DataTemplate＆gt;之间输入完全相同的代码标记：

<UserControl x:Class="CandiMan.View.CandidatePresentationControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:cm="clr-namespace:CandiMan;assembly=CandiMan"  
    xmlns:vw="clr-namespace:CandiMan.View;assembly=CandiMan"
    xmlns:vm="clr-namespace:CandiMan.ViewModel;assembly=CandiMan"             
    Height="100" Width="880" BorderBrush="Black" BorderThickness="1">

    <Grid x:Name="Grid" Height="100" Width="880" Background="LightGray">
        <Grid.RowDefinitions>
            <RowDefinition Height="24"/>
            <RowDefinition Height="24"/>
            <RowDefinition Height="24"/>
            <RowDefinition Height="24"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="190" />
            <ColumnDefinition Width="100" />
            <ColumnDefinition Width="100" />
            <ColumnDefinition Width="100" />
            <ColumnDefinition Width="190" />
            <ColumnDefinition Width="200" />
        </Grid.ColumnDefinitions>
        <Label Grid.Column="0" Grid.Row="0">Client</Label>
        <Label Grid.Column="0" Grid.Row="2">Contact</Label>
        <Label Grid.Column="1" Grid.Row="0">Date Presentation</Label>
        <Label Grid.Column="2" Grid.Row="0">Action</Label>
        <Label Grid.Column="3" Grid.Row="0">Date Interview</Label>
        <Label Grid.Column="3" Grid.Row="2">Time Interview</Label>
        <Label Grid.Column="4" Grid.Row="0">Remarks</Label>
        <Label Grid.Column="5" Margin="0,0,2,0">managed by</Label>
        <ComboBox Grid.Column="0" Grid.Row="1" Margin="2" Text="{Binding Path=Customer}">
            <!--Template-->
        </ComboBox>
        <TextBox Grid.Column="0" Grid.Row="3" Margin="2" Text="{Binding Path=Contact}"></TextBox>
        <TextBox Grid.Column="1" Grid.Row="1" Margin="2" Text="{Binding Path=PresentationDate}"></TextBox>
        <ComboBox Grid.Column="2" Grid.Row="1" Margin="2" Text="{Binding Path=Action}">
            <!--Template-->
        </ComboBox>
        <TextBox Grid.Column="3" Grid.Row="1" Margin="2" Text="{Binding Path=InterviewDate}"></TextBox>
        <TextBox Grid.Column="3" Grid.Row="3" Margin="2" Text="{Binding Path=InterviewTime}"></TextBox>
        <TextBox Grid.Column="4" Grid.Row="1" Grid.RowSpan="3" Margin="2" Text="{Binding Path=Remarks}"></TextBox>
        <StackPanel Orientation="Horizontal" Grid.Column="5" Grid.Row="1" >
            <ComboBox Width="124" Text="{Binding Path=Manager}" Margin="2"></ComboBox>
            <Button Width="60" Height="20" Margin="4,0,0,0" >Mail</Button>
        </StackPanel>
        <CheckBox Grid.Column="5" Grid.Row="3" Margin="2,2,4,2">Rejection communicated</CheckBox>
       </Grid>

</UserControl>

到名为CandidatePresentationControl的用户控件中，并像

一样

<ListBox>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Grid>
                <vw:CandidatePresentationControl/>
            </Grid>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

它不会被渲染。没有错误，只是一个空的列表框。有人能帮助我吗？

谢谢！

编辑：我忘记了一些事情，不管它是否重要：我正在做的所有事情都是用户控制。

Answer 1

引用的UserControl在另一个UserControl中并不重要。请尝试以下步骤以更好地调试您的XAML代码：http://beacosta.com/blog/?p=52

由于您已在XAML中硬连接数据，因此解释空ListBox的唯一方法是，父UserControl无法找到您的UserControl，imo。

Answer 2

<ListBox>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Grid>
                <vw:CandidatePresentationControl DataContext="{Binding}"/>
            </Grid>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

你必须以这种方式编写以绑定datacontext，我建议你看一下MVVM，它会让你知道如何更好地做到这一点。

用作DataTemplate时用户控件不呈现？

2 个答案: