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有人可以解释为什么在使用以下代码实现的 WPF 扩展控件“BusyIndi​​cator”中未使用在 CodeBehind 中分配的 ViewModel:

视图模型实现:

public partial class App : Application {

        private void OnStartup(object sender, StartupEventArgs seArgs) {
            MainWindowView mwv = new MainWindowView();
            mwv.DataContext = new DataSetViewModel(new DataSetModel());
            mwv.Show();

        }

    }

XAML:

<kit:BusyIndicator IsBusy="True" DisplayAfter="0" >

            <kit:BusyIndicator.BusyContentTemplate>
                    <DataTemplate>
                        <StackPanel Margin="4">
                            <TextBlock Text="{Binding Path=WaitProgressUploadTitle}" FontWeight="Bold" HorizontalAlignment="Center"/>
                            <StackPanel Margin="4">
                                <TextBlock Text="{Binding Path=WaitProgressUploadContent}" />
                                <ProgressBar Value="40" Height="15"/>
                            </StackPanel>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition/>
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <Button Grid.Column="0" Content="Pause" HorizontalAlignment="Right" Margin="0 0 2 0"/>
                                <Button Grid.Column="1" Content="Cancel" HorizontalAlignment="Left" Margin="2 0 0 0"/>
                            </Grid>
                        </StackPanel>
                    </DataTemplate>
                </kit:BusyIndicator.BusyContentTemplate>
                <kit:BusyIndicator.OverlayStyle>
                    <Style TargetType="Rectangle">
                        <Setter Property="Fill" Value="#ffffeeee"/>
                    </Style>
                </kit:BusyIndicator.OverlayStyle>
                <kit:BusyIndicator.ProgressBarStyle>
                    <Style TargetType="ProgressBar">
                        <Setter Property="Visibility" Value="Collapsed"/>
                    </Style>
                </kit:BusyIndicator.ProgressBarStyle>

                <StackPanel>
                    <kitdg:DataGridControl Name="DataPreview" ItemsSource="{Binding Path=dvLbSelection}" Visibility="{Binding Path=FileOpenBad,Converter={StaticResource errorVisibility}}" ReadOnly="True"  />
                    <TextBlock Text="{Binding Path=FileOpenText}" Margin="0,100,0,0" HorizontalAlignment="Center" MaxWidth="675" TextAlignment="Center" FontSize="20" Visibility="{Binding Path=FileOpenGood,Converter={StaticResource errorVisibility}}" />
                </StackPanel>

            </kit:BusyIndicator>

在 VS2010 的输出窗口中显示以下内容:

System.Windows.Data 错误:40:BindingExpression 路径错误:在“对象”“字符串”(HashCode=-1880398257)上找不到“WaitProgressUploadTitle”属性。绑定表达式:路径=WaitProgressUploadTitle;DataItem='String' (HashCode=-1880398257); 目标元素是'TextBlock'(名称='');目标属性是“文本”(类型“字符串”) System.Windows.Data 错误:40:BindingExpression 路径错误:在“对象”“字符串”(HashCode=-1880398257)上找不到“WaitProgressUploadContent”属性。BindingExpression:Path=WaitProgressUploadContent; DataItem='String' (HashCode=-1880398257); 目标元素是'TextBlock'(名称='');目标属性是“文本”(类型“字符串”) System.Windows.Data 错误:40:BindingExpression 路径错误:在“对象”“DataSetViewModel”(HashCode=3476046)上找不到“connectionStringValidity”属性。绑定表达式:路径=连接字符串有效性;DataItem='DataSetViewModel' (HashCode=3476046); 目标元素是“图像”(名称=“errorInvalidSQLConnection”);目标属性是“工具提示”(类型“对象”)

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1 回答 1

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你没有设置DataContext你的BusyIndicator控制。您将其设置在MainWindowView对象上。您可以做的是在MainWindowView内部命名并设置控件的名称(显然替换为DataContext您在内部为窗口提供的任何名称):BusyIndicatorNameOfMainWindowView

<kit:BusyIndicator DataContext="{Binding DataContext, ElementName=NameOfMainWindowView}"
IsBusy="True" DisplayAfter="0" >
于 2013-02-16T01:32:37.133 回答