停止应用程序由于代码form_load而不显示

本文关键字：form load 显示 代码 应用程序 于代码 | 更新日期: 2023-09-27 18:33:41

如何阻止我的应用程序在form_load代码完成之前不显示？

public partial class updater : Form
{
    public updater()
    {           
        InitializeComponent();
        timer1.Interval = (10000) * (1);
        progressBar1.Value = 0;
        progressBar1.Maximum = 100;
        progressBar1.Update();
        timer1.Start();
    }
    private void updater_Load(object sender, EventArgs e)
    {          
        WebClient webClient = new WebClient();
        webClient.DownloadProgressChanged += webClient_DownloadProgressChanged;
        webClient.DownloadFile("http://download827.mediafire.com/jl9c098fnedg/ncqun56uddq0y1d/Stephen+Swartz+-+Survivor+%28Feat+Chloe+Angelides%29.wav", Application.StartupPath + "''Stephen Swartz - Survivor (Feat Chloe Angelides).wav");
        // System.Diagnostics.Process.Start("''Test.exe");
        this.Close();   
    }
    void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
        progressBar1.Update();
    }
}

停止应用程序由于代码form_load而不显示

如果使用DownloadFileAsync它不会阻塞UI线程，并允许Form加载并在Progressbar中显示进度，然后您可以使用DownloadFileCompleted事件关闭Form

例：

    public Form1()
    {
        InitializeComponent();
        progressBar1.Value = 0;
        progressBar1.Maximum = 100;
        progressBar1.Update();
    }
    private void updater_Load(object sender, EventArgs e)
    {
        WebClient webClient = new WebClient();
        webClient.DownloadProgressChanged += webClient_DownloadProgressChanged;
        webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(webClient_DownloadFileCompleted);
        webClient.DownloadFileAsync(new Uri("http://download827.mediafire.com/jl9c098fnedg/ncqun56uddq0y1d/Stephen+Swartz+-+Survivor+%28Feat+Chloe+Angelides%29.wav"), Application.StartupPath + "''Stephen Swartz - Survivor (Feat Chloe Angelides).wav");
    }
    private void webClient_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
    {
        Close();
    }
    private void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
        progressBar1.Update();
    }

一种方法是从加载显示事件中移动代码。因此，代码将在显示表单后开始运行。

另一个是创建一个线程，您将在其中下载文件。为此，您可以使用 BackgroundWorker

private void updater_Load(object sender, EventArgs e)
{     
    BackgroundWorker worker = new BackgroundWorker();
    worker.DoWork += (s, eArgs) =>
        {
            WebClient webClient = new WebClient();
            webClient.DownloadFile("someUrl", "somePath");
        };
    worker.RunWorkerAsync();
}

在这种情况下，女巫也存在更适合webClient.DownloadFileAsync方法。您可以在sa_ddam213答案中找到描述。

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