零.引言
PropertyGrid中我们经常看到一些下拉式的编辑方式（Color属性）和弹出式编辑框（字体），这些都是为一些复杂的属性提供的编辑方式，本文主要说明如何实现这样的编辑方式。
一.为属性提供编辑类
弹出式和下拉式是如何实现的呢，这需要为属性提供一个专门的编辑类。.Net为我们提供了一个System.Drawing.Design.UITypeEditor类，它是所有编辑类的基类，从他继承出了诸如ColorEditor、FontEditor的类，因此我们可以在属性框中编辑颜色和字体。定义了这样的类，我们也可以为自己的属性实现弹出式和下拉式编辑方式。
先看一下MSDN中对UITypeEditor的介绍：提供可用于设计值编辑器的基类，这些编辑器可提供用户界面 (UI)，用来表示和编辑所支持的数据类型的对象值。
UITypeEditor 类提供一种基类，可以从该基类派生和进行扩展，以便为设计时环境实现自定义类型编辑器。通常，您的自定义类型编辑器与 PropertyGrid 控件进行交互。在文本框值编辑器不足以有效地选择某些类型的值的情况下，自定义类型编辑器非常有用。
继承者说明：
若要实现自定义设计时 UI 类型编辑器，必须执行下列步骤：
- 定义一个从 UITypeEditor 派生的类。
- 重写 EditValue 方法以处理用户界面、用户输入操作以及值的分配。
- 重写 GetEditStyle 方法，以便将编辑器将使用的编辑器样式的类型通知给“属性”窗口。
通过执行下列步骤，可以为在“属性”窗口中绘制值的表示形式添加附加支持：
- 重写 GetPaintValueSupported 方法以指示编辑器支持显示值的表示形式。
- 重写 PaintValue 方法以实现该值的表示形式的显示。
- 如果编辑器应具有初始化行为，则重写 UITypeEditor 构造函数方法。
二.下拉式编辑方式
接下来我们来实现下拉式编辑方式，接下来举一个具体的例子来说明。
首先假如我们有一个控件类MyControl：
1 public class MyControl : System.Windows.Forms.UserControl
2 {
3 private double _angle;
4
5 [BrowsableAttribute(true)]
6 public double Angle
7 {
8 get
9 { return _angle; }
10 set
11 { _angle = value; }
12 }
13
14 public MyControl()
15 {
16 this._angle = 90;
17 }
18
19 protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
20 {
21 e.Graphics.DrawString("The Angle is " + _angle, this.Font, Brushes.Red,0,0);
22 }
23 }
其中有个属性Angle，我们要为其提供下拉式和弹出式编辑方式，当然了，一般都是较为复杂的属性才需要，这里只是为了举例说明。
我们为其设计一个编辑类AngleEditor，在第二节中，继承说明中的第一条和第二条，EditValue和GetEditStyle两个函数，这是必须要重写的：
1 [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
2 public class AngleEditor : System.Drawing.Design.UITypeEditor
3 {
4 public AngleEditor()
5 {
6 }
7 //下拉式还是弹出式
8 public override System.Drawing.Design.UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
9 {
10 return UITypeEditorEditStyle.DropDown;
11 }
12
13 // 为属性显示UI编辑框
14 public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, System.IServiceProvider provider, object value)
15 {
16 //值类型不为double，直接返回value
17 if (value.GetType() != typeof(double))
18 return value;
19
20 //值为double，显示下拉式或弹出编辑框
21 IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
22 if (edSvc != null)
23 {
24 // 显示编辑框并初始化编辑框的值
25 AngleControl angleControl = new AngleControl((double)value);
26 edSvc.DropDownControl(angleControl);
27 // 返回编辑框中编辑的值.
28 if (value.GetType() == typeof(double))
29 return angleControl.angle;
30 }
31 return value;
32 }
33
34 //下面两个函数是为了在PropertyGrid中显示一个辅助的效果
35 //可以不用重写
36 public override void PaintValue(System.Drawing.Design.PaintValueEventArgs e)
37 {
38 int normalX = (e.Bounds.Width / 2);
39 int normalY = (e.Bounds.Height / 2);
40
41 e.Graphics.FillRectangle(new SolidBrush(Color.DarkBlue), e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);
42 e.Graphics.FillEllipse(new SolidBrush(Color.White), e.Bounds.X + 1, e.Bounds.Y + 1, e.Bounds.Width - 3, e.Bounds.Height - 3);
43 e.Graphics.FillEllipse(new SolidBrush(Color.SlateGray), normalX + e.Bounds.X - 1, normalY + e.Bounds.Y - 1, 3, 3);
44
45 double radians = ((double)e.Value * Math.PI) / (double)180;
46 e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Red), 1), normalX + e.Bounds.X, normalY + e.Bounds.Y,
47 e.Bounds.X + (normalX + (int)((double)normalX * Math.Cos(radians))),
48 e.Bounds.Y + (normalY + (int)((double)normalY * Math.Sin(radians))));
49 }
50
51 public override bool GetPaintValueSupported(System.ComponentModel.ITypeDescriptorContext context)
52 {
53 return true;
54 }
55 }
56
57 // 这里是我们要显示出来的编辑器，把它作为一个内置类
58 //从UserControl继承，要在上面EditValue函数中使用的
59 internal class AngleControl : System.Windows.Forms.UserControl
60 {
61 public double angle; //编辑的角度
62 private float x; //鼠标位置
63 private float y;
64
65 public AngleControl(double initial_angle)
66 {
67 this.angle = initial_angle;
68 }
69 //显现时，显示属性的当前值
70 protected override void OnLoad(EventArgs e)
71 {
72 int originX = (this.Width / 2);
73 int originY = (this.Height / 2);
74 this.x = (float)(50 * Math.Cos(this.angle * Math.PI / 180) + originX);
75 this.y = (float)(50 * Math.Sin(this.angle * Math.PI / 180) + originY);
76 base.OnLoad(e);
77 }
78
79 //绘制控件，用来显示编辑角度
80 protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
81 {
82 int originX = (this.Width / 2);
83 int originY = (this.Height / 2);
84
85 e.Graphics.DrawEllipse(Pens.Black, originX - 50, originY - 50, 100, 100);
86 e.Graphics.DrawLine(Pens.Black, originX, originY, x, y);
87
88 e.Graphics.DrawString("Angle:" + this.angle, this.Font, Brushes.Red, 0, 0);
89 }
90 //鼠标移动时设置角度
91 protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
92 {
93 if (e.Button == MouseButtons.Left)
94 {
95 int originX = (this.Width / 2);
96 int originY = (this.Height / 2);
97 double len = Math.Sqrt(Math.Pow(e.X - originX, 2) + Math.Pow(e.Y - originY, 2));
98 double h = e.Y - originY;
99 this.angle = Math.Asin(h / len);
100 if ((e.X >= originX && e.Y >= originY))
101 {
102 this.x = (float)(50 * Math.Cos(this.angle) + originX);
103 this.y = (float)(50 * Math.Sin(this.angle) + originY);
104 this.angle = this.angle * 180 / Math.PI;
105 }
106 else if (e.X < originX && e.Y > originY)
107 {
108 this.x = (float)(originX - 50 * Math.Cos(this.angle));
109 this.y = (float)(50 * Math.Sin(this.angle) + originY);
110 this.angle = 180 - this.angle * 180 / Math.PI;
111 }
112 else if (e.X < originX && e.Y < originY)
113 {
114 this.x = (float)(originX - 50 * Math.Cos(this.angle));
115 this.y = (float)(originY + 50 * Math.Sin(this.angle));
116 this.angle = 180 - this.angle * 180 / Math.PI;
117 }
118 else if (e.X >= originX && e.Y <= originY)
119 {
120 this.x = (float)(originX + 50 * Math.Cos(this.angle));
121 this.y = (float)(originY + 50 * Math.Sin(this.angle));
122 this.angle = 360 + this.angle * 180 / Math.PI;
123 }
124 this.Invalidate();
125 }
126
127 }
128
129 }
这里有两个类，一个是AngleEditor，他就是我们要用于到属性特性中的编辑类，一个是AngleControl，他是辅助AngleEditor来编辑属性的，也就是说，他就是一个form，当我们编辑属性时，他会显现出来，供我们编辑属性值，可以是textBox，图形，表格，各种方式，只需要最后他返回编辑好的属性值给AngleEditor类。在AngleEditor类中的EditValue函数中，我们会调用AngleControl类，并接受它返回的值。
设计好编辑类后，把它应用到MyControl类中的Angle属性中，在Angle属性中增加特性[EditorAttribute(typeof(AngleEditor), typeof(System.Drawing.Design.UITypeEditor))]，相当于告诉PropertyGrid我们要用AngleEditor来编辑这个属性。
1 [BrowsableAttribute(true)]
2 [EditorAttribute(typeof(AngleEditor), typeof(System.Drawing.Design.UITypeEditor))]
3 public double Angle
4 {
5 get
6 { return _angle; }
7 set
8 { _angle = value; }
9 }
好了，现在就可以使用下拉框来编辑我们的Angle属性了，效果如下：
上面那个圆圈就是我们用来编辑角度的。
三.弹出式编辑方式
实现了下拉式，我们来实现弹出式，弹出式和下拉式非常的相像，现在要弹出一个编辑框，因此我们的AngleControl类不能从UserControl继承，而从From继承，让他成为一个对话框，在AngleEditor的EditValue函数中，弹出他并接受返回值，如下：
1 [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
2 public class AngleEditor : System.Drawing.Design.UITypeEditor
3 {
4 public AngleEditor()
5 {
6 }
7 //下拉式还是弹出式
8 public override System.Drawing.Design.UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
9 {
10 return UITypeEditorEditStyle.Modal;//弹出式
11 }
12
13 // 为属性显示UI编辑框
14 public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, System.IServiceProvider provider, object value)
15 {
16 //值类型不为double，直接返回value
17 if (value.GetType() != typeof(double))
18 return value;
19
20 //值为double，显示下拉式或弹出编辑框
21 IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
22 if (edSvc != null)
23 {
24 // 显示编辑框并初始化编辑框的值
25 AngleControl2 angleControl = new AngleControl2((double)value);
26 edSvc.ShowDialog(angleControl);
27 // 返回编辑框中编辑的值.
28 if (value.GetType() == typeof(double))
29 return angleControl.angle;
30 }
31 return value;
32 }
33
34 //下面两个函数是为了在PropertyGrid中显示一个辅助的效果
35 //可以不用重写
36 public override void PaintValue(System.Drawing.Design.PaintValueEventArgs e)
37 {
38 int normalX = (e.Bounds.Width / 2);
39 int normalY = (e.Bounds.Height / 2);
40
41 e.Graphics.FillRectangle(new SolidBrush(Color.DarkBlue), e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);
42 e.Graphics.FillEllipse(new SolidBrush(Color.White), e.Bounds.X + 1, e.Bounds.Y + 1, e.Bounds.Width - 3, e.Bounds.Height - 3);
43 e.Graphics.FillEllipse(new SolidBrush(Color.SlateGray), normalX + e.Bounds.X - 1, normalY + e.Bounds.Y - 1, 3, 3);
44
45 double radians = ((double)e.Value * Math.PI) / (double)180;
46 e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Red), 1), normalX + e.Bounds.X, normalY + e.Bounds.Y,
47 e.Bounds.X + (normalX + (int)((double)normalX * Math.Cos(radians))),
48 e.Bounds.Y + (normalY + (int)((double)normalY * Math.Sin(radians))));
49 }
50
51 public override bool GetPaintValueSupported(System.ComponentModel.ITypeDescriptorContext context)
52 {
53 return true;
54 }
55 }
56
57 // 这里是我们要显示出来的编辑器，把它作为一个内置类
58 //从UserControl继承，要在上面EditValue函数中使用的
59 internal class AngleControl2 : System.Windows.Forms.Form
60 {
61 public double angle; //编辑的角度
62 private float x; //鼠标位置
63 private float y;
64
65 public AngleControl(double initial_angle)
66 {
67 this.angle = initial_angle;
68 }
69 //显现时，显示属性的当前值
70 protected override void OnLoad(EventArgs e)
71 {
72 int originX = (this.Width / 2);
73 int originY = (this.Height / 2);
74 this.x = (float)(50 * Math.Cos(this.angle * Math.PI / 180) + originX);
75 this.y = (float)(50 * Math.Sin(this.angle * Math.PI / 180) + originY);
76 base.OnLoad(e);
77 }
78
79 //绘制控件，用来显示编辑角度
80 protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
81 {
82 int originX = (this.Width / 2);
83 int originY = (this.Height / 2);
84
85 e.Graphics.DrawEllipse(Pens.Black, originX - 50, originY - 50, 100, 100);
86 e.Graphics.DrawLine(Pens.Black, originX, originY, x, y);
87
88 e.Graphics.DrawString("Angle:" + this.angle, this.Font, Brushes.Red, 0, 0);
89 }
90 //鼠标移动时设置角度
91 protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
92 {
93 if (e.Button == MouseButtons.Left)
94 {
95 int originX = (this.Width / 2);
96 int originY = (this.Height / 2);
97 double len = Math.Sqrt(Math.Pow(e.X - originX, 2) + Math.Pow(e.Y - originY, 2));
98 double h = e.Y - originY;
99 this.angle = Math.Asin(h / len);
100 if ((e.X >= originX && e.Y >= originY))
101 {
102 this.x = (float)(50 * Math.Cos(this.angle) + originX);
103 this.y = (float)(50 * Math.Sin(this.angle) + originY);
104 this.angle = this.angle * 180 / Math.PI;
105 }
106 else if (e.X < originX && e.Y > originY)
107 {
108 this.x = (float)(originX - 50 * Math.Cos(this.angle));
109 this.y = (float)(50 * Math.Sin(this.angle) + originY);
110 this.angle = 180 - this.angle * 180 / Math.PI;
111 }
112 else if (e.X < originX && e.Y < originY)
113 {
114 this.x = (float)(originX - 50 * Math.Cos(this.angle));
115 this.y = (float)(originY + 50 * Math.Sin(this.angle));
116 this.angle = 180 - this.angle * 180 / Math.PI;
117 }
118 else if (e.X >= originX && e.Y <= originY)
119 {
120 this.x = (float)(originX + 50 * Math.Cos(this.angle));
121 this.y = (float)(originY + 50 * Math.Sin(this.angle));
122 this.angle = 360 + this.angle * 180 / Math.PI;
123 }
124 this.Invalidate();
125 }
126
127 }
128
129 }
可以看到，只修改了三个地方：
- AngleEditor类中GetEditStyle函数返回Modal，表明是以弹出式编辑。
- AngleEditor类中EditValue函数中调用编辑控件的方式：
AngleControl2 angleControl = new AngleControl2((double)value);
edSvc.ShowDialog(angleControl);
3.AngleControl2从Form继承，让他显示为对话框，这里为了区别上面的AngleControl类，将其改成了AngleControl2。
现在看看效果：
实现了弹出式的编辑方式。
四.完整代码
下面是完整的代码：
1 using System;
2 using System.ComponentModel;
3 using System.Drawing;
4 using System.Drawing.Design;
5 using System.Windows.Forms;
6 using System.Windows.Forms.Design;
7
8 namespace TestUITypeEditor
9 {
10 //编辑器类
11 [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
12 public class AngleEditor : System.Drawing.Design.UITypeEditor
13 {
14 public AngleEditor()
15 {
16 }
17
18 //下拉式还是弹出式
19 public override System.Drawing.Design.UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
20 {
21 return UITypeEditorEditStyle.DropDown;
22 //return UITypeEditorEditStyle.Modal;
23 }
24
25 //编辑属性值
26 public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, System.IServiceProvider provider, object value)
27 {
28 if (value.GetType() != typeof(double))
29 return value;
30
31 //显示编辑框
32 IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
33 if (edSvc != null)
34 {
35 AngleControl angleControl = new AngleControl((double)value);
36 edSvc.DropDownControl(angleControl);
37 //AngleControl2 angleControl = new AngleControl2((double)value);
38 //edSvc.ShowDialog(angleControl);
39
40 // 获取返回值
41 if (value.GetType() == typeof(double))
42 return angleControl.angle;
43 }
44 return value;
45 }
46
47 //绘制辅助属性显示
48 public override void PaintValue(System.Drawing.Design.PaintValueEventArgs e)
49 {
50 int normalX = (e.Bounds.Width / 2);
51 int normalY = (e.Bounds.Height / 2);
52
53 e.Graphics.FillRectangle(new SolidBrush(Color.DarkBlue), e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);
54 e.Graphics.FillEllipse(new SolidBrush(Color.White), e.Bounds.X + 1, e.Bounds.Y + 1, e.Bounds.Width - 3, e.Bounds.Height - 3);
55 e.Graphics.FillEllipse(new SolidBrush(Color.SlateGray), normalX + e.Bounds.X - 1, normalY + e.Bounds.Y - 1, 3, 3);
56
57 double radians = ((double)e.Value * Math.PI) / (double)180;
58 e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Red), 1), normalX + e.Bounds.X, normalY + e.Bounds.Y,
59 e.Bounds.X + (normalX + (int)((double)normalX * Math.Cos(radians))),
60 e.Bounds.Y + (normalY + (int)((double)normalY * Math.Sin(radians))));
61 }
62
63 //使用辅助属性显示
64 public override bool GetPaintValueSupported(System.ComponentModel.ITypeDescriptorContext context)
65 {
66 return true;
67 }
68 }
69
70 // 下拉式编辑方式
71 internal class AngleControl : System.Windows.Forms.UserControl
72 {
73 public double angle;
74 private float x;
75 private float y;
76
77 public AngleControl(double initial_angle)
78 {
79 this.angle = initial_angle;
80 }
81
82 protected override void OnLoad(EventArgs e)
83 {
84 int originX = (this.Width / 2);
85 int originY = (this.Height / 2);
86
87 this.x = (float)(50 * Math.Cos(this.angle * Math.PI / 180) + originX);
88 this.y = (float)(50 * Math.Sin(this.angle * Math.PI / 180) + originY);
89
90 base.OnLoad(e);
91 }
92
93 protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
94 {
95 int originX = (this.Width / 2);
96 int originY = (this.Height / 2);
97
98 e.Graphics.DrawEllipse(Pens.Black, originX - 50, originY - 50, 100, 100);
99 e.Graphics.DrawLine(Pens.Black, originX, originY, x, y);
100
101 e.Graphics.DrawString("Angle:" + this.angle, this.Font, Brushes.Red, 0, 0);
102 }
103
104 protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
105 {
106 if (e.Button == MouseButtons.Left)
107 {
108 int originX = (this.Width / 2);
109 int originY = (this.Height / 2);
110 double len = Math.Sqrt(Math.Pow(e.X - originX, 2) + Math.Pow(e.Y - originY, 2));
111 double h = e.Y - originY;
112 this.angle = Math.Asin(h / len);
113 if ((e.X >= originX && e.Y >= originY))
114 {
115 this.x = (float)(50 * Math.Cos(this.angle) + originX);
116 this.y = (float)(50 * Math.Sin(this.angle) + originY);
117
118 this.angle = this.angle * 180 / Math.PI;
119 }
120 else if (e.X < originX && e.Y > originY)
121 {
122 this.x = (float)(originX - 50 * Math.Cos(this.angle));
123 this.y = (float)(50 * Math.Sin(this.angle) + originY);
124
125 this.angle = 180 - this.angle * 180 / Math.PI;
126 }
127 else if (e.X < originX && e.Y < originY)
128 {
129 this.x = (float)(originX - 50 * Math.Cos(this.angle));
130 this.y = (float)(originY + 50 * Math.Sin(this.angle));
131
132 this.angle = 180 - this.angle * 180 / Math.PI;
133 }
134 else if (e.X >= originX && e.Y <= originY)
135 {
136 this.x = (float)(originX + 50 * Math.Cos(this.angle));
137 this.y = (float)(originY + 50 * Math.Sin(this.angle));
138
139 this.angle = 360 + this.angle * 180 / Math.PI;
140 }
141
142 this.Invalidate();
143 }
144 }
145 }
146
147
148 //弹出式编辑框
149 internal class AngleControl2 : System.Windows.Forms.Form
150 {
151 public double angle;
152 private float x;
153 private float y;
154
155 public AngleControl2(double initial_angle)
156 {
157 this.angle = initial_angle;
158 }
159
160 protected override void OnLoad(EventArgs e)
161 {
162 int originX = (this.Width / 2);
163 int originY = (this.Height / 2);
164
165 this.x = (float)(50 * Math.Cos(this.angle * Math.PI / 180) + originX);
166 this.y = (float)(50 * Math.Sin(this.angle * Math.PI / 180) + originY);
167
168 base.OnLoad(e);
169 }
170
171 protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
172 {
173 int originX = (this.Width / 2);
174 int originY = (this.Height / 2);
175
176 e.Graphics.DrawEllipse(Pens.Black, originX - 50, originY - 50, 100, 100);
177 e.Graphics.DrawLine(Pens.Black, originX, originY, x, y);
178
179 e.Graphics.DrawString("Angle:" + this.angle, this.Font, Brushes.Red, 0, 0);
180 }
181
182 protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
183 {
184 if (e.Button == MouseButtons.Left)
185 {
186 int originX = (this.Width / 2);
187 int originY = (this.Height / 2);
188 double len = Math.Sqrt(Math.Pow(e.X - originX, 2) + Math.Pow(e.Y - originY, 2));
189 double h = e.Y - originY;
190 this.angle = Math.Asin(h / len);
191 if ((e.X >= originX && e.Y >= originY))
192 {
193 this.x = (float)(50 * Math.Cos(this.angle) + originX);
194 this.y = (float)(50 * Math.Sin(this.angle) + originY);
195
196 this.angle = this.angle * 180 / Math.PI;
197 }
198 else if (e.X < originX && e.Y > originY)
199 {
200 this.x = (float)(originX - 50 * Math.Cos(this.angle));
201 this.y = (float)(50 * Math.Sin(this.angle) + originY);
202
203 this.angle = 180 - this.angle * 180 / Math.PI;
204 }
205 else if (e.X < originX && e.Y < originY)
206 {
207 this.x = (float)(originX - 50 * Math.Cos(this.angle));
208 this.y = (float)(originY + 50 * Math.Sin(this.angle));
209
210 this.angle = 180 - this.angle * 180 / Math.PI;
211 }
212 else if (e.X >= originX && e.Y <= originY)
213 {
214 this.x = (float)(originX + 50 * Math.Cos(this.angle));
215 this.y = (float)(originY + 50 * Math.Sin(this.angle));
216
217 this.angle = 360 + this.angle * 180 / Math.PI;
218 }
219
220 this.Invalidate();
221 }
222 }
223 }
224
225
226 //控件
227 public class MyControl : System.Windows.Forms.UserControl
228 {
229 private double _angle;
230
231 [BrowsableAttribute(true)]
232 [EditorAttribute(typeof(AngleEditor), typeof(System.Drawing.Design.UITypeEditor))]
233 public double Angle
234 {
235 get
236 { return _angle; }
237 set
238 { _angle = value; }
239 }
240
241
242 public MyControl()
243 {
244 this._angle = 90;
245 }
246
247 protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
248 {
249 e.Graphics.DrawString("The Angle is " + _angle, this.Font, Brushes.Red,0,0);
250 }
251 }
252 }
新建Window工程，添加该文件，在工具箱中将MyControl控件拖入Form，在属性框中编辑Angle属性。
这里我们把AngleControl和AngleControl2都集成在里面了，当然实际只需选中一种，要实现弹出式，只需按照（三）中的方法，修改AngleEditor中两个地方即可。
时间： 2024-08-04 10:48:41