错了错了
根据textbox 的特性声明
[Designer("System.Windows.Forms.Design.TextBoxDesigner, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"), SRDescription("DescriptionTextBox"), ComVisible(true), ClassInterface(ClassInterfaceType.AutoDispatch)]
在 system.design.dll
里面有个
| internal class TextBoxDesigner : TextBoxBaseDesigner |
| { |
| // Fields |
| private DesignerActionListCollection _actionLists; |
| |
| // Methods |
| public TextBoxDesigner(); |
| protected override void PreFilterProperties(IDictionary properties); |
| |
| // Properties |
| public override DesignerActionListCollection ActionLists { get; } |
| private char PasswordChar { get; set; } |
| } |
| |
| |
| Expand Methods |
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| |
这个是 特性调用的设计器 这个实际器有一个属性 是
| public override DesignerActionListCollection ActionLists |
| { |
| get |
| { |
| if (this._actionLists == null) |
| { |
| this._actionLists = new DesignerActionListCollection(); |
| this._actionLists.Add(new TextBoxActionList(this)); |
| } |
| return this._actionLists; |
| } |
| } |
| |
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你为你的控件实现一个类似的 designer 并且在类特性里面调用 应该就可以做出这个三角
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