方法的后台工作人员报告字符串 [英] Background worker report string from a method
问题描述
我创建了一个复制文件方法,我想将其包裹在后台工作人员周围.我希望复制文件方法将字符串报告给当前文件名所在的UI线程(更改标签).我似乎无法使其正常工作,并且出现了跨线程ui错误.这是我的代码.
I've created a copy file method that i would like to wrap around a background worker. I would like the copy file method to report a string back to the UI thread (change a label) on the current file name its on. I can't seem to get it to work and i'm getting cross thread ui errors. Here is my code.
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;
这部分是用于模拟用户的自定义类
This part is a custom class used to impersonate a user
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;
}
}
报告进度
private void bgwBackup_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
lblBackupStatus.Text = e.UserState.ToString();
}
按钮事件
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... ";
}
有什么建议吗?谢谢!
Any suggestions ? Thanks!
推荐答案
问题来自以下代码行:
lblBackupStatus.Text = e.UserState.ToString();
这是从另一个线程执行的.您需要使用Invoke方法来更新标签:
This is executed from another thread. You need to use the Invoke method to update your label:
this.InvokeEx(c => this.lblBackupStatus.Text = e.UserState.ToString());
以下是我通常用于控件调用的辅助方法:
Here is the helper methods I usually use for control invoke:
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:我已经直接输入了,它可能无法编译(帮助方法除外)
PS: I've typed directly, it may not compile (except the helper methods)
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