Question

快乐星期五！我正在构建一个多WinForm应用程序，并且遇到了一些麻烦。

我有一个始终保持打开状态的主WinForm。它每分钟都会访问一个数据库，寻找变化，如果有变化，它将打开第二个WinForm（这看起来像是一种愚蠢的做事方式，但出于我的目的，这是最好的方法）。

将以下代码粘贴到我的Form1.cs中并不能解决问题：

Application.Run(new Form2());

你们能指出我正确的方向吗？我不知道在哪里转。

Answer 1

Form2 form2 = new Form2();
form2.Show();

并且为了防止打开大量表格，可能：

Form2 form2 = new Form2();
form2.ShowDialog();

@comment：

BackgroundWorker用于保持您的当前 UI线程响应。它的设计并不是为了保持多种形式的快节奏。请考虑在Background thread内将密集型代码作为ThreadPool运行。

Answer 2

如果您希望启动一个漫长的过程并向用户显示进度，例如就像您有进度条或类似的东西一样，您应该使用BackgroundWorker来完成这项工作。这是一个简单的例子：

public partial class ProgressForm : Form {
    // Assuming you have put all required controls on design...

    // Allowing some properties to be exposed for progress update...
    public properties MaximumProgress { 
        set {
            progressBar1.Maximum = value;
        }
    public properties OverallProgress { 
        set {
            progressBar1.Value = value;
        }
}

public partial class MainForm : Form {
    private BackgroundWorker backgroundWorker1;
    private ProgressForm _pf;

    public MainForm() {
        InitializeComponent();

        backgroundWorker1 = new BackgroundWorker();
        backgroundWorker1.WorkerReportsProgress = true;
        backgroundWorker1.DoWork += backgroundWorker1_DoWork;
        backgroundWorker1.ProgressChanged += backgroundWorker1_ProgressChanged;
        backgroundWorker1.RunWorkerCompleted += backgroundWorker1_RunWorkerCompleted;
    }

    // Assuming process starts on Button click.
    private void button1_Click(object sender, EventArgs e) {
        _pf = new ProgressForm();
        _pf.MaximumProgress = number-of-elements-to-treat-returned-by-prevision-or-whatever-else;

        // Launching the background workder thread.
        backgroundWorker1.RunWorkerAsync(); // Triggering the DoWork event.

        // Then showing the progress form.
        _pf.ShowDialog();
    }

    private void backgroundWorker1_DoWork(object sender, EventArgs e) {
        LaunchProcess();
    }

    private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) {
        _pf.OverallProgress = e.ProgressPercentage;
    }

    private void backgroundWorker1_RunWorkerCompleted(object sender, EventArgs e) {
        _pf.Close();
        _pf.Dispose();
    }

    private void LaunchProcess() {
        // Do some work here...
        // Reporting progress somewhere within the processed task
        backgroundWorker1.ReportProgress();
    }
}

这不是一个可编译的代码，因为它的目的是说明主要的想法。

现在，你想做的事情是否相似？

在另一个WinForm代码中以编程方式打开WinForm

2 个答案: