UITypeEditor未正确关闭

Question

我正在使用带有UITypeEditor的UserControl。用户控件具有“确定”和“取消”按钮，这两个按钮除了显示带有“确定”或“取消”的MessageBox，然后隐藏用户控件外，什么也不做。但是当我单击其中一个按钮时，PropertyGrid会显示一个空的框，在我离开之前UserControl一直在那里。然后，该框消失，并显示该对话框。

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下面是用户控制代码：

using System;
using System.Windows.Forms;

namespace j2associates.Tools.Winforms.Controls.DesignTimeSupport.SupportingClasses
{
    public partial class SimpleTest : UserControl
    {
        public bool Cancelled { get; set; }

        public SimpleTest()
        {
            InitializeComponent();
        }

        private void btnOK_Click(object sender, EventArgs e)
        {
            Cancelled = false;
            this.Hide();
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            Cancelled = true;
            this.Hide();
        }
    }
}

下面是UITypeEditor代码：

using System;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;

using j2associates.Tools.Winforms.Controls.DesignTimeSupport.SupportingClasses;

namespace j2associates.Tools.Winforms.Controls.DesignTimeSupport.Editors
{
    internal class TimeElementsEditor : UITypeEditor // PropertyEditorBase<TimeElementsUserControl>
    {
        public override UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
        {
            return UITypeEditorEditStyle.DropDown;
        }

        public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, IServiceProvider provider, object value)
        {
            if (value.GetType() == typeof(j2aTimePicker.TimeElementOptions))
            {
                var editorService = provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;
                if (editorService != null)
                {
                    using (var st = new SimpleTest())
                    {
                        editorService.DropDownControl(st);
                        if (st.Cancelled)
                        {
                            MessageBox.Show("Cancel");
                        }
                        else
                        {
                            MessageBox.Show("OK");
                        }
                        editorService.CloseDropDown();
                    }
                }
            }

            return value;
        }
    }
}

任何想法和/或建议都将不胜感激。

Answer 1

叹息，当你找到它的时候，它总是很容易。

我需要通过一个重载的构造函数传入IWindowsFormsEditorService，缓存它，然后在Button Click事件中调用它的CloseDropdown方法，而不是隐藏用户控件。它现在可以像预期的那样工作。

/// <summary>
/// Displays an OK and Cancel button. When one is pressed, 
/// the dialog is closed and a message box is displayed.
/// The actual value of the property is unchanged throughout.
/// </summary>
/// <remarks>The ToolboxItem attribute prevents the control from being displayed in the ToolKit.</remarks>
[ToolboxItem(false)]
public partial class SimpleTest : UserControl
{
    public bool Cancelled { get; set; }

    private IWindowsFormsEditorService m_EditorService;

    // Require the use of the desired overloaded constructor.
    private SimpleTest()
    {
        InitializeComponent();
    }

    internal SimpleTest(IWindowsFormsEditorService editorService)
        : this()
    {
        // Cache the editor service.
        m_EditorService = editorService;
    }

    private void btnOK_Click(object sender, EventArgs e)
    {
        Cancelled = false;
        m_EditorService.CloseDropDown();
    }

    private void btnCancel_Click(object sender, EventArgs e)
    {
        Cancelled = true;
        m_EditorService.CloseDropDown();
    }
}

下面是修改后的编辑器调用：

using (var simpleTest = new SimpleTest(editorService))
{
    editorService.DropDownControl(simpleTest);
    MessageBox.Show(simpleTest.Cancelled ? "Cancelled" : "OK");
}