C# 为什么自定义控件任务窗格不更新其属性?
我设计了一个自定义面板,可以在运行时展开或折叠窗体。 当我从自定义设计任务更改其高度时,它不会更新它。 我的控制类代码:C# 为什么自定义控件任务窗格不更新其属性?,c#,custom-controls,C#,Custom Controls,我设计了一个自定义面板,可以在运行时展开或折叠窗体。 当我从自定义设计任务更改其高度时,它不会更新它。 我的控制类代码: using System; using System.Windows.Forms; using System.ComponentModel; using System.ComponentModel.Design; using System.Windows.Forms.Design; [Designer(typeof(MyControlDesigner))] publi
using System;
using System.Windows.Forms;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms.Design;
[Designer(typeof(MyControlDesigner))]
public partial class ExpandCollapsePanel : UserControl
{
private bool flag = false;
private Size size;
public int usrVerticalSize;
public ExpandCollapsePanel()
{
InitializeComponent();
}
[DefaultValueAttribute(true)]
public int SetVerticalSize
{
get
{
return usrVerticalSize;
}
set
{
usrVerticalSize = value;
}
}
taskpanedesign类的代码:
namespace ExpandCollapseFormLibrary
{
class CustomDialogue : ControlDesigner
{
private DesignerActionListCollection actionLists;
public override DesignerActionListCollection ActionLists
{
get
{
if (actionLists == null)
{
actionLists = new DesignerActionListCollection();
actionLists.Add(new MyActionListItem(this));
}
return actionLists;
}
}
}
internal class MyActionListItem : DesignerActionList
{
public MyActionListItem(ControlDesigner owner) : base(owner.Component)
{
}
public override DesignerActionItemCollection GetSortedActionItems()
{
var items = new DesignerActionItemCollection();
//items.Add(new DesignerActionTextItem("Hello world", "Misc"));
items.Add(new DesignerActionPropertyItem("Checked", "Vertical Drop Down Size"));
return items;
}
public int Checked
{
get { return ((ExpandCollapsePanel)base.Component).SetVerticalSize; }
set { ((ExpandCollapsePanel)base.Component).SetVerticalSize = value; }
}
}
}
当我更改该值时,Form1(拖放的位置)设计的类将永久保留该值。
自定义窗格的SetVerticalSize属性值确实发生了更改,但问题是设计器宿主根本不知道这一点。要通知设计器宿主您的自定义窗格更改,您应该实现如下内容(我建议您阅读以了解更多详细信息):
“任务窗格”中的值为150,首次正常工作,但更改后无法更新。所做的只是更改一个字段(
usrVerticalSize
),该字段似乎在其他任何地方都没有使用(除非您没有显示该字段)-该值随后如何使用?什么绑定到SetVerticalSize
?特别是,它实际上从未以任何方式更改控件的大小。
int usrVerticalSize;
[DefaultValue(true)]
public int SetVerticalSize {
get { return usrVerticalSize; }
set {
FireChanging(); //changing notification
try {
usrVerticalSize = value;
}
finally { FireChanged(); } //changed notification
}
}
void FireChanging() {
IComponentChangeService service = GetComponentChangeService();
if(service != null)
service.OnComponentChanging(this, null);
}
void FireChanged() {
IComponentChangeService service = GetComponentChangeService();
if(service != null)
service.OnComponentChanged(this, null, null, null);
}
IComponentChangeService GetComponentChangeService() {
return GetService(typeof(IComponentChangeService)) as IComponentChangeService;
}