我有一个列表视图，其中包含列表的itemsource。当我尝试执行以下代码时，调用类未处理InvocationException。如果需要更多代码，我可以添加所请求的内容。
我的目标是能够更新列表视图中的进度条。从按钮单击事件调用worker1.RunWorkerAsync（）。
XAML：
<Window x:Class="CS3000Config2.Dialogs.Clone"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Clone Scanner Configuration" Height="768" Width="1024" FontSize="16" WindowStyle="ToolWindow" WindowStartupLocation="CenterScreen" ResizeMode="NoResize" Loaded="Window_Loaded">
<Window.Background>
<LinearGradientBrush EndPoint=".5,1" StartPoint=".5,0">
<GradientStop Color="#b8e1fc" Offset="0" />
<GradientStop Color="#a9d2f3" Offset="0.10" />
<GradientStop Color="#90bae4" Offset="0.25" />
<GradientStop Color="#90bcea" Offset="0.37" />
<GradientStop Color="#90bff0" Offset=".50" />
<GradientStop Color="#6ba8e5" Offset=".51" />
<GradientStop Color="#a2daf5" Offset=".83" />
<GradientStop Color="#bdf3fd" Offset="1" />
</LinearGradientBrush>
</Window.Background>
<DockPanel>
<Grid>
<DockPanel Height="650" Margin="50,40,50,0" Width="800" VerticalAlignment="Top" Background="White">
<Grid>
<ToolBar Height="46" Margin="0,6,-11,0" Name="toolBar1" VerticalAlignment="Top" ToolBarTray.IsLocked="True" BorderBrush="Black" BorderThickness=".5" Loaded="toolBar1_Loaded">
<Button ToolBar.OverflowMode="AsNeeded" Click="Button_Click">
<StackPanel Orientation="Horizontal" VerticalAlignment="Center" >
<StackPanel.Resources>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="Margin" Value="10,0,0,0"/>
</Style>
</StackPanel.Resources>
<Image Source="/CS3000Config2;component/Resources/dsave.png" />
<TextBlock VerticalAlignment="Center" FontSize="16" Margin="5,0,0,0">Load To Selected Scanners</TextBlock>
</StackPanel>
</Button>
<Separator />
<Button ToolBar.OverflowMode="Never">
<StackPanel Orientation="Horizontal" VerticalAlignment="Center" >
<StackPanel.Resources>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="Margin" Value="10,0,0,0"/>
</Style>
</StackPanel.Resources>
<Image Source="/CS3000Config2;component/Resources/document-save-all2.png" />
<TextBlock VerticalAlignment="Center" FontSize="16" Margin="5,0,0,0"> Load To All Scanners</TextBlock>
</StackPanel>
</Button>
<Separator />
<Button ToolBar.OverflowMode="Never" Click="Button_Click_1">
<StackPanel Orientation="Horizontal" VerticalAlignment="Center" >
<StackPanel.Resources>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="Margin" Value="10,0,0,0"/>
</Style>
</StackPanel.Resources>
<Image Source="/CS3000Config2;component/Resources/refresh.gif" />
<TextBlock VerticalAlignment="Center" FontSize="16" Margin="5,0,0,0"> Refresh Scanner List</TextBlock>
</StackPanel>
</Button>
</ToolBar>
<ScrollViewer Margin="6.5,58,6,6" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" >
<Grid>
<ListView Margin="0,5" Name="listView1" SelectionMode="Multiple" HorizontalContentAlignment="Center">
<ListView.View >
<GridView >
<GridViewColumn Width="50" Header="">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Image Source="/CS3000Config2;component/Resources/cs3000-small.png" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="100" Header="Drive Letter" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="5,0,0,0" HorizontalAlignment="Center" Text="{Binding Path=Drive}" TextAlignment="Center" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="200" Header="Model" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="5,0,0,0" HorizontalAlignment="Center" Text="{Binding Path=Model}" TextAlignment="Center" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="200" Header="Serial Number" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="5,0,0,0" HorizontalAlignment="Center" Text="{Binding Path=Serial}" TextAlignment="Center" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="225" Header="" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<ProgressBar BorderBrush="Black" BorderThickness=".5" Width="200" Height="20" HorizontalAlignment="Center" Visibility="{Binding Path=isVisible}" Minimum="0" Value="{Binding Path=progress}" Maximum="{Binding Path=maxProgress}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</Grid>
</ScrollViewer>
</Grid>
</DockPanel>
</Grid>
</DockPanel>
C＃代码：
private void worker1_DoWork(object sender, DoWorkEventArgs e)
{
Config tmpConfig = config;
Config tmpConfig2 = new Config();
Dispatcher.Invoke((Action)(() =>
{
foreach (Scanner s in listView1.SelectedItems)
{
Int32 index = listView1.SelectedIndex;
tmpConfig2.LoadConfig(s.Drive + "\\Parameters\\Config.ini");
tmpConfig2.LoadSysInfo(s.Drive + "\\Parameters\\SYSINFO.TXT");
if (tmpConfig2.Model == "CS3070")
{
tmpConfig.BtName = tmpConfig2.BtName;
tmpConfig.BtPIN = tmpConfig2.BtPIN;
}
tmpConfig.WriteConfig(s.Drive + "\\Parameters\\Config.ini", tmpConfig);
String[] lines = File.ReadAllLines(s.Drive + "\\Parameters\\Config.ini");
s.maxProgress = lines.Length;
s.isVisible = Visibility.Visible;
for (int i = 0; i != lines.Length; i++)
{
items[index] = new Scanner() { Drive = s.Drive, Model = s.Model, isVisible = Visibility.Visible, progress = i + 1, maxProgress = lines.Length, Serial = s.Serial };
System.Threading.Thread.Sleep(10);
listView1.ItemsSource = null;
System.Threading.Thread.Sleep(10);
listView1.ItemsSource = items;
}
}
}));
}
答案 0 :(得分：0)
你当然可以这样做，而MVVM在这里是一个不相关的主题。通常，当您收到调用异常时，包装了原始异常（和关联调用堆栈），您应该查看内部异常。
如果您（或其他人）不熟悉......
在异常弹出窗口的“操作”标题下方，点击“Veiw Detail ...”链接
这将弹出“查看详细信息”对话框。
选择'InnerException'节点，并打开其详细信息（以相同的方式）。
继续向下钻取InnerExceptions，直到找到原始异常。
问题可能就像'对象引用未设置为对象的实例'一样简单。 但是你的基本策略很好并且可行。 希望这有帮助！