Question

我在“大”文件（大约4Mb）上做了一些操作

我这样做： 1.从目录中获取所有文件并将它们放在IList中MyInfoClass具有以下属性：name，extension，fullPath，creationDate，contentPart 2.我做一个Linq查询只获得一些扩展类型。 3.我循环查询Linq查询结果，每次打开文件，执行一些操作（获取值）并将结果放入MyFileIno.ContentPart。

仅供参考：30个文件，这是14秒的操作

这是工作。

问题是，当我从UI运行我的库时，当我单击按钮时，窗口在操作期间冻结。我想：

不冻结表单的解决方案
查看进度操作

你能给我解决这类问题的最佳做法吗？

谢谢，

代码

public class FileManager 
{
    public string CurrentFileName { get; set; }
    public void Validation(string path)
    {
        IList<InfoFile> listFile = GetListFile(path);
        foreach (InfoFile item in listFile)
        {
            CurrentFileName = item.Name;
            .....
        }
    }
}


private void button1_Click(object sender, EventArgs e)
{
    var worker = new BackgroundWorker();
    worker.DoWork += (s, args) =>
    {
        int percentProgress = 6;
        FileManager fileManager = new FileManager();
        fileManager.Validation(@"C:.....");
        ((BackgroundWorker)s).ReportProgress(percentProgress, fileManager.CurrentFileName);
    };

    worker.ProgressChanged += (s, args) =>
    {
        var currentFilename = (string)args.UserState;
        label1.Text = currentFilename;
        progressBar1.Value = args.ProgressPercentage;
    };

    worker.RunWorkerCompleted += (s, args) =>
    {
        progressBar1.Value = 0;
    };
    worker.RunWorkerAsync();
}

Answer 1

应用程序冻结，因为您正在主线程中执行文件解析。您可以使用BackgroundWorker在新线程上执行操作。这里有一些伪代码可以帮助您入门：

private void button1_Click(object sender, EventArgs e)
{
    var worker = new BackgroundWorker();
    worker.DoWork += (s, args) =>
    {
        // Here you perform the operation and report progress:
        int percentProgress = ...
        string currentFilename = ...
        ((BackgroundWorker)s).ReportProgress(percentProgress, currentFilename);
        // Remark: Don't modify the GUI here because this runs on a different thread
    };
    worker.ProgressChanged += (s, args) =>
    {
        var currentFilename = (string)args.UserState;
        // TODO: show the current filename somewhere on the UI and update progress
        progressBar1.Value = args.ProgressPercentage;
    };
    worker.RunWorkerCompleted += (s, args) =>
    {
        // Remark: This runs when the DoWork method completes or throws an exception
        // If args.Error != null report to user that something went wrong
        progressBar1.Value = 0;
    };
    worker.RunWorkerAsync();
}

Winforms：避免冻结应用程序

1 个答案: