Question

我有一个BackgroundWorker，在该工作者中我正在从excel文件中读取数据。如果excel文件中存在错误，则工作人员完成，然后显示另一个表单，用户可以在其中输入更正，然后按“确定”，然后从头开始再次运行工作程序。当工作人员成功完成时，应该更新我的Mainwindow上的标签，说它已经加载了excel。但标签不会更新。当我调试它时，我可以看到更新标签运行的代码，但它根本不起作用。请帮助，这让我疯了！

这是我的代码。

    private void worker_ReadFileData(object sender, DoWorkEventArgs e) {

        for (int j = 1; j < rcount + 1; j++) {
            worker.ReportProgress(j);

            // Do work


            if (j == 1) {
                ColumnIndex column = this.ValidateColumnIndexes(tableType);
                if (column != null) {    // If error in file, complete worker
                    fileData.isDataLoaded = false;
                    e.Result = fileData;
                    return;
                }
            }
        }

        fileData.isDataLoaded = true;
        e.Result = fileData;            // Pass the data to the completed method.

    }


    private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
        if (e.Error != null) {
        } else if (e.Cancelled) {
        } else {

            FileData fileData = (FileData) e.Result;

            if (fileData.isDataLoaded == true) {
                testLabel.Content = "It works!";
            } else {
                // Show Dialog where user can input the correction
                ColumnIndexPrompt columnIndexPrompt = new ColumnIndexPrompt(fileData.FilePath, fileData.FileExtension, fileData.TableType, fileData.Column);
                columnIndexPrompt.ShowDialog();
            }
        }
    }

    public void TriggerReadDataFile(string filePath, string fileExt, int tableType) {
        progBar.Value = 0;
        // Read the file data and populate the Registrars list, then show the datagrid
        worker.RunWorkerAsync(new FileData(filePath, fileExt, tableType));
    }

编辑：这是我打开的第二个窗口的代码（在上面的代码中使用.ShowDialog（））

    public ColumnIndexPrompt(string filePath, string fileExt, int tableType, ColumnIndex column) {
        InitializeComponent();

        this.filePath = filePath;
        this.fileExt = fileExt;
        this.tableType = tableType;
        this.column = column;

        lblColumnIndexErrorMsg.Text = column.ErrorMsg;
    }

    private void btnColumnIndexApply_Click(object sender, RoutedEventArgs e) {
        MainWindow originalForm = new MainWindow();
        int correctColumnNumber = int.Parse(txtColumnIndexCorrection.Text);
        column.Index = correctColumnNumber - 1;
        originalForm.UpdateSingleColumnIndex(column);
        originalForm.TriggerReadDataFile(this.filePath, this.fileExt, this.tableType);
        this.Close();
    }

WPF：UI元素未更新

0 个答案: