自定义控件与 PropertyGrid 配合不佳

Question

我有一个正在实现自定义 ToolStripItem 的类。一切似乎都很顺利，直到我尝试在设计时将项目添加到 ContextMenuStrip 中。如果我尝试直接从 ContextMenuStrip 添加自定义控件，PropertyGrid 就会冻结，并且不允许我修改“Checked”或“Text”属性。但是，如果我进入 ContextMenuStrip PropertyGrid 并通过 Items(...) 属性添加自定义控件，我就可以在该对话框中很好地修改自定义控件。我不确定我是否在某个地方缺少某个属性，或者底层代码是否有问题。这是 CustomToolStripItem 类的副本。正如您所看到的，这是一个非常简单的类。

[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ContextMenuStrip)]
public class CustomToolStripItem : ToolStripControlHost {

    #region Public Properties

    [Description("Gets or sets a value indicating whether the object is in the checked state")]
    [ReadOnly(false)]
    public bool Checked { get { return checkBox.Checked; } set { checkBox.Checked = value; } }

    [Description("Gets or sets the object's text")]
    [ReadOnly(false)]
    public override string Text { get { return checkBox.Text; } set { checkBox.Text = value; } }

    #endregion Public Properties

    #region Public Events

    public event EventHandler CheckedChanged;

    #endregion Public Events

    #region Constructors

    public CustomToolStripItem()
        : base(new FlowLayoutPanel()) {
        // Setup the FlowLayoutPanel.
        controlPanel = (FlowLayoutPanel)base.Control;
        controlPanel.BackColor = Color.Transparent;

        // Add the child controls.
        checkBox.AutoSize = true;
        controlPanel.Controls.Add(checkBox);
    }

    #endregion Constructors

    #region Protected Methods

    protected override void OnSubscribeControlEvents(Control control) {
        base.OnSubscribeControlEvents(control);
        checkBox.CheckedChanged += new EventHandler(CheckChanged);
    }

    protected override void OnUnsubscribeControlEvents(Control control) {
        base.OnUnsubscribeControlEvents(control);
        checkBox.CheckedChanged -= new EventHandler(CheckChanged);
    }

    #endregion Protected Methods

    #region Private Methods

    private void CheckChanged(object sender, EventArgs e) {
        // Throw the CustomToolStripItem's CheckedChanged event
        EventHandler handler = CheckedChanged;
        if (handler != null) { handler(sender, e); }
    }

    #endregion Private Methods

    #region Private Fields

    private FlowLayoutPanel controlPanel;
    private CheckBox checkBox = new CheckBox();

    #endregion Private Fields

Answer 1

如果您不介意使用标准 ToolStripMenuItem，它应该具有您创建的自定义控件的所有功能。它已经具有“Text”和“Checked”属性以及事件处理程序，以及所有正常的附加功能，尽管 ToolStripMenuItem 的“checked”外观与常规复选框不同。