在按钮事件中泛化窗体调用

本文关键字：窗体 调用 泛化 按钮 事件 | 更新日期: 2023-09-27 18:26:36

每当单击按钮时，我通常会调用这段代码来显示表单。

    private frmSelection _frmSelection;`
    private void _frmSelection_FormClosing(object sender, FormClosingEventArgs e)
    {
        _frmSelection = null;
    }
    private void changeFeedOrderToolStripMenuItem_Click(object sender, EventArgs e)
    {
        if (_frmSelection == null)
        {
            _frmSelection = new frmSelection();
            _frmSelection.FormClosing += _frmSelection_FormClosing;
            _frmSelection.WindowState = FormWindowState.Minimized;
            _frmSelection.Show();
            _frmSelection.WindowState = FormWindowState.Normal;
        }
        else
        {
            _frmSelection.WindowState = FormWindowState.Minimized;
            _frmSelection.WindowState = FormWindowState.Normal;
        }
    }

如果表单已打开，它将显示已打开的实例，而不是创建新实例。它运行良好
但我的问题是，每当我添加新表单时，我都需要复制粘贴并更改表单名称。
如何将其推广并添加到助手班

在按钮事件中泛化窗体调用

类似这样的东西：

public sealed class ReusableFormContainer<T> : IDisposable
    where T : Form, new()
{
    private bool isDisposed;
    private void HandleFormClosing(object sender, FormClosingEventArgs e)
    {
        Form = null;
    }
    public T Form { get; private set; }
    public void Show()
    {
        if (isDisposed)
        {
            throw new ObjectDisposedException(null);
        }
        if (Form == null)
        {
            Form = new T { WindowState = FormWindowState.Minimized };
            Form.FormClosing += HandleFormClosing;
            Form.Show();
        }
        else
        {
            Form.WindowState = FormWindowState.Minimized;
        }
        Form.WindowState = FormWindowState.Normal;
    }
    public void Dispose()
    {
        // IDisposable.Dispose is implemented to handle cases, when you want to close
        // wrapped form using code
        if (!isDisposed)
        {
            Form?.Dispose();
            isDisposed = true;
        }
    }
}

用法：

// must be initialized somewhere in constructors
private readonly ReusableFormContainer<FormA> container_A;
private readonly ReusableFormContainer<FormB> container_B;
private void button1_Click(object sender, EventArgs e)
{
    container_A.Show();
}
private void button2_Click(object sender, EventArgs e)
{
    container_B.Show();
}

下面的代码可能会执行您想要的操作。只是考虑使用Application函数，因为这些函数可以覆盖线程上的所有表单。

    public partial class Form1 : Form
{
    public int i; 
    private Form1 _frmSelection;
    public Form1()
    {
        InitializeComponent();
        i = Application.OpenForms.Count;
    }
private void _frmSelection_FormClosing(object sender, FormClosingEventArgs e)
    {
        _frmSelection = null;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (_frmSelection == null)
        {
            _frmSelection = new Form1();
            _frmSelection.FormClosing += _frmSelection_FormClosing;
            _frmSelection.WindowState = FormWindowState.Minimized;
            _frmSelection.WindowState = FormWindowState.Normal;
            _frmSelection.Show();
            if (Application.OpenForms.Count > 1)
            {
                _frmSelection.Text = Application.OpenForms[i].Text + " and going";
            }

        }
        else
        {
            _frmSelection.WindowState = FormWindowState.Minimized;
            _frmSelection.WindowState = FormWindowState.Normal;
        }
    }
}
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