我创建了以下数据模板：
<DataTemplate x:Key="StudentDataTemplate" DataType="local:IMDataSet+StudentRow" >
<DataTemplate.Resources>
<local:PhoneNumberConverter x:Key="phoneNumConv"/>
<local:SSIDConverter x:Key="SSIDNum"/>
<local:GenderConverter x:Key="genderConverter"/>
<local:DateToAgeConverter x:Key="dateToAgeConverter"/>
<local:ShamsiConverter x:Key="shamsiConverter"/>
</DataTemplate.Resources>
<Grid Name="grdContainer" HorizontalAlignment="Right" MaxWidth="800" MinWidth="250" >
<Grid.RowDefinitions>
<RowDefinition Height="45"/>
<RowDefinition Height="70"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="110"/>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<!--Drop Shadow-->
<Border x:Name="BrdShadow" BorderBrush="#FFC1C1C1" BorderThickness="1" Margin="0" CornerRadius="4" Grid.ColumnSpan="2" Grid.RowSpan="2">
<Border.Effect>
<DropShadowEffect BlurRadius="18" Direction="0" ShadowDepth="0"/>
</Border.Effect>
</Border>
<Border x:Name="BrdFrame" BorderBrush="#FFC1C1C1" BorderThickness="1" Margin="0" CornerRadius="4" Grid.ColumnSpan="2" Grid.RowSpan="3">
<Border.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="WhiteSmoke"/>
<GradientStop Color="#FFF8F8F8" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Margin="10" x:Name="BrdImageFrame" Child="{StaticResource StudentPic}" BorderThickness="0.5" BorderBrush="white" CornerRadius="0,0,2,2" Grid.RowSpan="2" Background="White">
<Border.Effect>
<DropShadowEffect BlurRadius="5" Direction="0" ShadowDepth="0"/>
</Border.Effect>
</Border>
<StackPanel Margin="1" Grid.Column="1" Grid.RowSpan="2">
<StackPanel Orientation="Horizontal" Margin="0,0,5,0">
<TextBlock Name="BlkGender" TextWrapping="Wrap" FontSize="20" FontFamily="/IM;component/Fonts/#Titr" Foreground="{DynamicResource HalfImportanceText}" Text="{Binding Path=Gender, Converter={StaticResource genderConverter}}" VerticalAlignment="Center" Margin="0,0,7,-5" />
<TextBlock x:Name="BlkFullName" TextWrapping="Wrap" FontSize="26.667" FontFamily="/IM;component/Fonts/#Titr" Foreground="{DynamicResource HighImportanceText}" VerticalAlignment="Center" >
<TextBlock.Text>
<MultiBinding StringFormat="{}{0} {1}">
<Binding Path="Name"/>
<Binding Path="Family"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
<TextBlock Name="blkAge" Text="{Binding Path=BornDate, Converter={StaticResource dateToAgeConverter }, StringFormat={} - {0} ساله}" TextWrapping="Wrap" FontSize="20" FontFamily="/IM;component/Fonts/#Mitra" Foreground="{DynamicResource HalfImportanceText}" ToolTip="{Binding Path=BornDate, Converter={StaticResource shamsiConverter}}" VerticalAlignment="Center" TextAlignment="Center" Margin="0,9,0,0" />
</StackPanel>
<TextBlock Name="blkFather" TextWrapping="Wrap" FontSize="20" Foreground="{DynamicResource HalfImportanceText}" Margin="20,2,0,0" FontFamily="/IM;component/Fonts/#Mitra" Text="{Binding Path=FatherName, StringFormat=فرزند: {0}}" />
<TextBlock Name="blkDefContact" TextWrapping="Wrap" FontSize="20" Foreground="{DynamicResource HalfImportanceText}" Margin="20,2,0,0" FontFamily="/IM;component/Fonts/#Mitra" Text="{Binding Path=DefaultContact, Converter={StaticResource phoneNumConv}}" FlowDirection="LeftToRight" HorizontalAlignment="Left" />
</StackPanel>
<Expander x:Name="expander" IsExpanded="True" Margin="0" VerticalAlignment="Top" d:LayoutOverrides="Width" Grid.Row="2" Grid.ColumnSpan="2" Style="{DynamicResource ExpanderStyle1}" ExpandDirection="Down" >
<StackPanel Margin="10,10,10,15" x:Name="stkFinName">
<TextBlock x:Name="FinName" TextWrapping="Wrap" FontSize="20" FontFamily="Calibri" FontWeight="Bold" Foreground="{DynamicResource HalfImportanceText}" >
<TextBlock.Text>
<MultiBinding StringFormat="{}{0} {1}">
<Binding Path="EnglishName"/>
<Binding Path="EnglishFamily"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
<StackPanel Orientation="Horizontal" Margin="8,5,5,0">
<TextBlock x:Name="blkBornLoc" TextWrapping="Wrap" FontSize="20" FontFamily="/IM;component/Fonts/#Mitra" Foreground="{DynamicResource HalfImportanceText}" Text="{Binding Path=BornLocation, StringFormat=تولد: {0}}" Margin="0,0,5,0" />
<TextBlock x:Name="blkSSID" TextWrapping="Wrap" FontSize="20" FontFamily="/IM;component/Fonts/#Mitra" Foreground="{DynamicResource HalfImportanceText}" Text="{Binding Path=SSID, Converter={StaticResource SSIDNum}}" Margin="5,0,0,0" FlowDirection="LeftToRight" HorizontalAlignment="Left" />
</StackPanel>
<TextBlock x:Name="blkLicense" TextWrapping="Wrap" FontSize="20" FontFamily="/IM;component/Fonts/#Mitra" Foreground="{DynamicResource HalfImportanceText}" Text="{Binding License}" Margin="10,0,10,0" />
<TextBlock x:Name="blkAddress" TextWrapping="Wrap" MaxWidth="250" HorizontalAlignment="Left" FontSize="20" FontFamily="/IM;component/Fonts/#Mitra" Foreground="{DynamicResource HalfImportanceText}" Text="{Binding Address}" Margin="10,5,10,0" />
</StackPanel>
</Expander>
</Grid>
</DataTemplate>
当我从中创建一个实例时，没有问题，但是当我想创建多个实例时（例如在 listBox 中将其用作 itemTemplate），它会引发以下异常
设置属性“System.Windows.Controls.Decorator.Child”引发异常。InnerException：指定元素已经是另一个元素的逻辑子元素。先断开它。