错误 - 无法在WPF应用程序中找到静态资源

Question

我正在学习WPF并从这个 MSDN教程开始.

我只是按照教程.当我按照教程完成代码并尝试运行时,我在XAML页面中得到一个例外

'为'System.Windows.StaticResourceExtension'提供价值引发了一个异常.行号"27"和行位置"55".".内部异常显示错误是"找不到名为'personItemTemplate'的资源.资源名称区分大小写."

罪魁祸首XAML如下.

<Page x:Class="ExpenseIt.ExpenseItHome"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      mc:Ignorable="d" 
      d:DesignHeight="321" d:DesignWidth="532"
    Title="ExpenseIt - Home">

    <Grid Margin="10,0,10,10">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="230" />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="Auto" />
            <RowDefinition />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Label Grid.Column="1" Style="{StaticResource headerTextStyle}">View Expense Report</Label>
        <!-- Resource List Label-->
        <Border Grid.Column="1" Grid.Row="1" Style="{StaticResource listHeaderStyle}">
            <Label VerticalAlignment="Center" Foreground="White" FontWeight="Bold">Names</Label>
        </Border>
        <!-- Resource List-->
        <ListBox Name="peopleListBox" Grid.Column="1" Grid.Row="2" 
         ItemsSource="{Binding Source={StaticResource ExpenseDataSource}, XPath=Person}"
         ItemTemplate="{StaticResource personItemTemplate}">
        </ListBox>

        <!-- View button -->
        <Button Grid.Column="1" Grid.Row="3" Click="Button_Click" Style="{StaticResource buttonStyle}">View</Button>

        <!-- Set Background Image-->
        <Grid.Background>
            <ImageBrush ImageSource="watermark.png" />
        </Grid.Background>
        <Grid.Resources>

            <!-- Expense Report Data -->
            <XmlDataProvider x:Key="ExpenseDataSource" XPath="Expenses">
                <x:XData>
                    <Expenses xmlns="">
                        <Person Name="TommyVance" Department="Legal">
                            <Expense ExpenseType="Lunch" ExpenseAmount="50" />
                            <Expense ExpenseType="Transportation" ExpenseAmount="50" />
                        </Person>
                        <Person Name="PhilJackson" Department="Marketing">
                            <Expense ExpenseType="Document printing"
      ExpenseAmount="50"/>
                            <Expense ExpenseType="Gift" ExpenseAmount="125" />
                        </Person>
                        <Person Name="PaulBriggs" Department="Engineering">
                            <Expense ExpenseType="Magazine subscription" 
     ExpenseAmount="50"/>
                            <Expense ExpenseType="New machine" ExpenseAmount="600" />
                            <Expense ExpenseType="Software" ExpenseAmount="500" />
                        </Person>
                        <Person Name="AlfredNobel" Department="Finance">
                            <Expense ExpenseType="Dinner" ExpenseAmount="100" />
                        </Person>
                    </Expenses>
                </x:XData>
            </XmlDataProvider>
            <!-- Data Template to mention that Name should be fetched from the XMLDataProvider -->
            <!-- Name item template -->
            <DataTemplate x:Key="personItemTemplate">
                <Label Content="{Binding XPath=@Name}"/>
            </DataTemplate>
        </Grid.Resources>
    </Grid>
</Page>

我在Grid资源中有所需的模板,因此将其添加为静态资源.但是,它抛出了datatemplate不可用的异常.

Answer 1

移动<Grid.Resources> ... </Grid.Resources>到网格定义的顶部,它将起作用.DataTemplate似乎需要在引用之前定义.我将您的示例复制到一个应用程序中并确认将资源部分向上移动解决了问题.

Answer 2

此错误有多种原因。我的问题的解决方案是我未能添加“InitializeComponent();” 在 Application 的构造函数中，因此从未初始化包含 ResourceDictionary 的 Xaml。因此错误“找不到...”我没有提到我是手工编码的。如果您通过 Visual Studio 生成代码，这不是必需的。

Answer 3

我遇到了同样的错误，但上面的答案都不起作用。

我的错误通过更改数据模板上的 XAML 得到解决：

<DataTemplate DataType="local:DtoDmParent" x:Key="dataTemplateDtoDmParent"  >
    <TextBlock Text="test"/>
</DataTemplate>

到

<DataTemplate x:Key="dataTemplateDtoDmParent" DataType="local:DtoDmParent" >
    <TextBlock Text="test"/>
</DataTemplate>

更改数据类型参数位于 x:key 参数之后