Question

我正在尝试创建一个新窗口并在其上显示完成情况。我使用BackgroundWorker报告事件来做到这一点。并且它更新了绑定到ProgressBar和TextBox的窗口的本地属性。

当进度更改

时会触发此操作

    void copyBw_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
    //This is public method of child window which sets progress and text properties
        cpw.ChangeCompletion(e.ProgressPercentage, UserDefinedFileName);
    }

这是我用来设置属性

的方法

public void ChangeCompletion(int Value, string file){
        Completion = Value;
        FileCopiedString += file;
    }

以下是我的XAML

<ProgressBar Name="CopyProgress" Margin="0,41,-2,324" Width="634" Height="5" Maximum="100" Value="{Binding Completion, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}" Grid.ColumnSpan="2"/>
    <Label  Content="Please wait while files are getting copied ... " Margin="10,10,384,334" Grid.ColumnSpan="2"/>
    <RichTextBox Name="CopyFileList" Margin="10,62,10,10" Grid.ColumnSpan="2">
        <FlowDocument>
            <Paragraph>
                <Run Text="{Binding FileCopiedString, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}"/>
            </Paragraph>
        </FlowDocument>
    </RichTextBox>

两个属性的值都会更改，但不会向UI报告。

我检查了很多线程，但无法找到解决方案。对此的任何指示都会非常有用。

更新：当我直接设置ProgressBar的属性时，（没有绑定）然后它就可以了。 CopyProgress.Value = Value;

但这不对，绑定应该发生。现在我已将其缩小到Binding问题，但我不知道错误在哪里。

Answer 1

我刚尝试过。它对我有用。 XAML：

private void testM() throws Exception {

        pooler = DBPool_SF.getInstance();
        dataSource = pooler.getDataSource();
        Connection con = dataSource.getConnection();
        con.setAutoCommit(false);

        PreparedStatement ps,ps1 = null;
        ResultSet rs = null;

        String SEL_QUERY = "select item_id from test";
        String UPDATE_QUERY = "insert into test_t values(?)";

        ps = con.prepareStatement(SEL_QUERY);
        rs = ps.executeQuery();
        ps1 = con.prepareStatement(UPDATE_QUERY );

        while (rs.next()) {

            String id = rs.getString("item_id");
            System.out.println(id);
             ps1.setString(1,id);
             ps1.addBatch();
            }

            ps1.executeBatch();
        con.close();
    }

C＃：

<ProgressBar Name="CopyProgress" Height="15" Maximum="10" Value="{Binding Completion}" Margin="0,26,0,220" />
    <Label  Content="Please wait while files are getting copied ... " Margin="10,10,384,334" Grid.ColumnSpan="2"/>
    <RichTextBox Name="CopyFileList" Margin="12,60,41,12">
        <FlowDocument>
            <Paragraph>
                <Run Text="{Binding FileCopiedString}"/>
            </Paragraph>
        </FlowDocument>
    </RichTextBox>

Answer 2

最后，我已经能够解决它了。我认为它有点矫枉过正但它有效。

我没有关注MVVM。在我创建ViewModel并将其设置为View的默认DataContext之后，它工作正常。当我试图与ViewModel和View混淆时，虽然它应该可以工作，但事实并非如此。

查看：

private void InitializeQueue()
{
    try
    {
        _mq = MessageQueue.GetPrivateQueuesByMachine(_queueServerName).Where(qu => qu.Path == _queueAddress).FirstOrDefault();
        _mq.Formatter = new BinaryMessageFormatter();
        _mq.ReceiveCompleted += MessageReceiveCompleted;

    }
    catch (Exception ex)
    {
        Trace.WriteLine("Failed to initialize Queue!" + Environment.NewLine + " Error:" + Environment.NewLine + ex.Message);
        throw;
    }
}


async void MessageReceiveCompleted(object sender, ReceiveCompletedEventArgs e)
{
    _mq.BeginReceive();
    try
    {    
        await ProcessMessageAsync(e.Message);
    }
    catch (Exception ex)
    {
        Trace.WriteLine("Error occured during report fetching:" + Environment.NewLine + ex.Message);
        throw;
    }
}

视图模型：

enter public partial class Window1 : Window, INotifyPropertyChanged{
public Window1(){   
ProgressBarViewModel pbvm = new ProgressBarViewModel();
    InitializeComponent();
    DataContext = pbvm;
}}

}

更新另一个窗口

2 个答案: