方法的后台工作人員報告字符串

Question

我創建了一個復制文件方法，我想將其包裹在后台工作人員周圍。 我希望復制文件方法將字符串報告給當前文件名所在的UI線程（更改標簽）。 我似乎無法使其正常工作，並且出現了跨線程ui錯誤。 這是我的代碼。

做工作

      //Textbox Array Values
        // 0 = computername
        // 1 = username
        // 2 = password
        string[] tbvalues = (string[])e.Argument;


        string computer = tbvalues[0];
        string user = tbvalues[1];
        string pass = tbvalues[2];

        string userfavorites = @"\\" + computer + @"\C$\Users\" + user + @"\Favorites";

        string hdrivepath = @"\\dist-win-file-3\homes\" + user + @"\Favorites";

        string SourcePath = userfavorites;
        string DestinationPath = hdrivepath;

這部分是用於模擬用戶的自定義類

        using ( new Impersonator( user, "Domain.org", pass ) )
        {
            DirectoryInfo sp = new DirectoryInfo(SourcePath);
            DirectoryInfo dp = new DirectoryInfo(DestinationPath);

            CopyAll(sp, dp, bgwBackup, e);



        }
}

方法

   public void CopyAll(DirectoryInfo source, DirectoryInfo target, BackgroundWorker worker, DoWorkEventArgs e)
    {


        // Check if the target directory exists, if not, create it.
        if (Directory.Exists(target.FullName) == false)
        {
            Directory.CreateDirectory(target.FullName);
        }

        // Copy each file into it’s new directory.
        foreach (FileInfo fi in source.GetFiles())
        {

            //THIS IS THE STRING I WOULD LIKE TO RELAY TO THE BACKGROUND WORKER REPORT PROGRESS
            string currentfile = "Copying " + target.FullName.ToString() + fi.Name.ToString();                

            fi.CopyTo(Path.Combine(target.ToString(), fi.Name), true);

            worker.ReportProgress(0, currentfile);


        }

        // Copy each subdirectory using recursion.
        foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
        {
            DirectoryInfo nextTargetSubDir =
                target.CreateSubdirectory(diSourceSubDir.Name);
            CopyAll(diSourceSubDir, nextTargetSubDir, bgwBackup, e);
        }
    }

    private void cboBackuppwdshow_CheckedChanged(object sender, EventArgs e)
    {
        if (cboBackuppwdshow.Checked == true)
        {
            txtBackuppwd.UseSystemPasswordChar = false;
        }

        else
        {
            txtBackuppwd.UseSystemPasswordChar = true;
        }
    }

報告進度

 private void bgwBackup_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        lblBackupStatus.Text = e.UserState.ToString();
    }

按鈕事件

 private void btnBackupqueue_Click(object sender, EventArgs e)
    {
        // Kickoff the worker thread to begin it's DoWork function.

        string[] tbvalues = {ddlBackupselectcomp.Text, ddlBackupselectuser.Text, txtBackuppwd.Text};


        backupWorker.RunWorkerAsync(tbvalues);
        lblBackupStatus.Text = "Backup process started please wait... ";
    }

有什么建議么 ？ 謝謝！

Answer 1

問題來自以下代碼行：

lblBackupStatus.Text = e.UserState.ToString();

這是從另一個線程執行的。 您需要使用Invoke方法來更新標簽：

this.InvokeEx(c => this.lblBackupStatus.Text = e.UserState.ToString());

這是我通常用於控件調用的輔助方法：

public static class ControlExtensions
{
    public static TResult InvokeEx<TControl, TResult>(this TControl control,
                                                Func<TControl, TResult> func) where TControl : Control
    {
        return control.InvokeRequired
                ? (TResult)control.Invoke(func, control)
                : func(control);
    }

    public static void InvokeEx<TControl>(this TControl control,
                                            Action<TControl> func) where TControl : Control
    {
        control.InvokeEx(c => { func(c); return c; });
    }

    public static void InvokeEx<TControl>(this TControl control, Action action)
        where TControl : Control
    {
        control.InvokeEx(c => action());
    }
}

PS：我直接輸入了，可能無法編譯（助手方法除外）