Question

在winforms应用程序中，我有一个选项表单。该表单具有treview控件和面板控件。根据树视图中的用户选择，我想加载/添加用户控件到面板控件。我应该何时创建/启动用户控件？在表单加载事件处理程序或选择树视图节点后？我应该在关闭事件处理程序中处理用户控件吗？

这是我的代码：

public partial class Options : Form
{
    //usercontrols
    Connections _connections;
    Notifications _notifications;
    Proxy _proxy;

    private void Options_Load(object sender, EventArgs e)
    {
        treeViewOptions.ExpandAll();

        _connections = new Connections();
        _notifications = new Notifications();
        _proxy = new Proxy();
    }

    private void treeViewOptions_AfterSelect(object sender, TreeViewEventArgs e)
    {
        switch (treeViewOptions.SelectedNode.Name)
        {

            case "NodeConnection":
                ControlPanel.Controls.Clear();
                ControlPanel.Controls.Add(_connections);
                break;
            case "NodeNotifications":
                ControlPanel.Controls.Clear();
                ControlPanel.Controls.Add(_notifications);
                break;
            case "NodeProxy":
                ControlPanel.Controls.Clear();
                ControlPanel.Controls.Add(_proxy);
                break;
        }
    }
}

由于

Answer 1

是的，你需要解决这个问题。现在您正在泄漏用户控件实例，它们不会自动处理。他们的终结者也没有照顾这份工作。一段时间后，当程序消耗了10,000个窗口句柄时，程序将崩溃。

使它看起来与此相似：

private void treeViewOptions_AfterSelect(object sender, TreeViewEventArgs e)
{
    foreach (Control ctl in ControlPanel.Controls) ctl.Dispose();
    ControlPanel.Controls.Clear();

    switch (treeViewOptions.SelectedNode.Name)
    {

        case "NodeConnection":
            ControlPanel.Controls.Add(_connections);
            break;
        case "NodeNotifications":
            ControlPanel.Controls.Add(_notifications);
            break;
        case "NodeProxy":
            ControlPanel.Controls.Add(_proxy);
            break;
    }
}

Answer 2

<强>解决方案：

public partial class Options : Form
{
    //usercontrols
    Connections _connections;
    Notifications _notifications;
    Proxy _proxy;

private void Options_Load(object sender, EventArgs e)
{
    treeViewOptions.ExpandAll();

    _connections = new Connections();
    _notifications = new Notifications();
    _proxy = new Proxy();
}

private void treeViewOptions_AfterSelect(object sender, TreeViewEventArgs e)
{
    ControlPanel.Controls.Clear();

    switch (treeViewOptions.SelectedNode.Name)
    {

        case "NodeConnection":

            ControlPanel.Controls.Add(_connections);
            break;
        case "NodeNotifications":

            ControlPanel.Controls.Add(_notifications);
            break;
        case "NodeProxy":

            ControlPanel.Controls.Add(_proxy);
            break;
    }
}

   private void Options_FormClosing(object sender, FormClosingEventArgs e)
    {

        _connections.Dispose();          
        _notifications.Dispose();
        _proxy.Dispose();

    }

}

我何时启动并处理我的UserControls？

2 个答案: