正确使用进度条

本文关键字： | 更新日期: 2024-10-25 04:54:08

这是我第一次在 C# 中使用进度条。我的代码正在复制一些文件，我想通过进度条显示进度。

我

不喜欢我的代码的一点是，我必须遍历所有文件才能设置最大值......后来我再次经历相同的过程来复制文件。

我只是想不出一种方法来确保酒吧的流畅进步而不这样做。我首先必须知道最大值，对吗？还是有诡计？

代码如下所示：

设置最大值：

private static void setProgressBar(List<Source> sources, List<Destination> destinations)
{
    progress.Value = 0;
    progress.Maximum = 0;
    foreach (var source in sources)
    {
        progress.Maximum += System.IO.Directory.GetDirectories(source.directory, "*",
            SearchOption.AllDirectories).Count() * destinations.Count +
            System.IO.Directory.GetFiles(source.directory, "*.*", SearchOption.AllDirectories).Count() *
            destinations.Count;
    }

复制文件：

public static void CopyData(List<Source> sources, List<Destination> destinations, RichTextBox box, ProgressBar bar)
{
    log = box;
    progress = bar;
    setProgressBar(sources, destinations);
    foreach (var source in sources)
    {
        foreach (var dirPath in System.IO.Directory.GetDirectories(source.directory, "*",
            SearchOption.AllDirectories))
        {
            foreach (var destination in destinations)
            {
                logger(dirPath);
                System.IO.Directory.CreateDirectory(dirPath.Replace(source.directory, destination.directory));
            }
        }
        foreach (var newPath in System.IO.Directory.GetFiles(source.directory, "*.*", SearchOption.AllDirectories))
        {
            foreach (var destination in destinations)
            {
                logger(newPath);
                File.Copy(newPath, newPath.Replace(source.directory, destination.directory), true);
            }
        }
    }
}

递增进度条：
私人静态空隙记录仪（字符串输出） { .log。文本 += "复制： " + 输出 + 系统.环境.新行; .log。选择开始 = 日志。文本长度; .log。ScrollToCaret（）; 进展。增量（1）; }

所以我运行相同的代码两次...我不喜欢这样:)

正确使用进度条

我在这里看到两个错误：您从未在 CopyData 方法中设置进度条的值第二个是：你的 CopyData 方法会导致你的 UI 冻结，直到方法完成（此时进度条将从 0 跳到 100%）。

您可以将 CopyData 方法放在 BackgroundWorker 中并调用 ReportProgress，并在 ReportProgress-event 中设置栏的新值。

下面是如何做到这一点的示例。而不是static void Main(..)调用工作线程，您将从那里开始 CopyData 方法

static void Main(string[] args)
{
    System.ComponentModel.BackgroundWorker worker = new System.ComponentModel.BackgroundWorker();
    worker.ProgressChanged += Worker_ProgressChanged;
    worker.DoWork += Worker_DoWork;
    //Do work
    worker.RunWorkerAsync();
}
private static void Worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    //Get Values
    var source = null;
    var destinations = null;
    //CopyData Method
    setProgressBar(sources, destinations);
    foreach (var source in sources)
    {
        foreach (var dirPath in System.IO.Directory.GetDirectories(source.directory, "*", SearchOption.AllDirectories))
        {
            foreach (var destination in destinations)
            {
                logger(dirPath);
                System.IO.Directory.CreateDirectory(dirPath.Replace(source.directory, destination.directory));
                //Increase Value by 1
                (sender as System.ComponentModel.BackgroundWorker).ReportProgress(1);
            }
        }
        foreach (var newPath in System.IO.Directory.GetFiles(source.directory, "*.*", SearchOption.AllDirectories))
        {
            foreach (var destination in destinations)
            {
                logger(newPath);
                File.Copy(newPath, newPath.Replace(source.directory, destination.directory), true);
                //Increase Value by 1
                (sender as System.ComponentModel.BackgroundWorker).ReportProgress(1);
            }
        }
    }
}
private static void Worker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
{
    if (e.ProgressPercentage == 1)
    {
        //If Value gets higher than Maximum it will cause an Exception
        if (progress.Value < progress.Maximum)
            progress.Value += 1;
    }
}
private static void setProgressBar(List sources, List destinations)
{
    progress.Value = 0;
    progress.Maximum = 0;
    foreach (var source in sources)
    {
        foreach (var dirPath in System.IO.Directory.GetDirectories(source.directory, "*", SearchOption.AllDirectories))
        {
            //Simplified
            progress.Maximum += destinations.Count;
        }
        foreach (var newPath in System.IO.Directory.GetFiles(source.directory, "*.*", SearchOption.AllDirectories))
        {
            //Simplified
            progress.Maximum += destinations.Count;
        }
    }
}