为完成《Windows Forms编程实战》第175页的“尝试一下”，特制ContextMenuStrip，有BUG请指评，谢谢！
使用： 可直接new一个，在参数中填TextBox类实例即可。
Code在此1
public class MyContextMenuStrip : System.Windows.Forms.ContextMenuStrip2
{3
/**//// <summary>4
/// 剪切按钮5
/// </summary>6
System.Windows.Forms.ToolStripMenuItem TSMI_Cut = 7
new System.Windows.Forms.ToolStripMenuItem();8
9
/**//// <summary>10
/// 复制按钮11
/// </summary>12
System.Windows.Forms.ToolStripMenuItem TSMI_Copy = 13
new System.Windows.Forms.ToolStripMenuItem();14
15
/**//// <summary>16
/// 粘贴按钮17
/// </summary>18
System.Windows.Forms.ToolStripMenuItem TSMI_Paste = 19
new System.Windows.Forms.ToolStripMenuItem();20
21
/**//// <summary>22
/// 删除按钮23
/// </summary>24
System.Windows.Forms.ToolStripMenuItem TSMI_Delete = 25
new System.Windows.Forms.ToolStripMenuItem();26
27
/**//// <summary>28
/// 撤销按钮29
/// </summary>30
System.Windows.Forms.ToolStripMenuItem TSMI_Undo = 31
new System.Windows.Forms.ToolStripMenuItem();32
33
/**//// <summary>34
/// 全选按钮35
/// </summary>36
System.Windows.Forms.ToolStripMenuItem TSMI_SelectAll =37
new System.Windows.Forms.ToolStripMenuItem();38
39
/**//// <summary>40
/// 上分隔条41
/// </summary>42
System.Windows.Forms.ToolStripSeparator TSS_Up =43
new System.Windows.Forms.ToolStripSeparator();44
45
/**//// <summary>46
/// 下分隔条47
/// </summary>48
System.Windows.Forms.ToolStripSeparator TSS_Down =49
new System.Windows.Forms.ToolStripSeparator();50
51
/**//// <summary>52
/// 构造函数53
/// </summary>54
protected MyContextMenuStrip()55
{56
this.InitializeComponent();57
58
this.Items.AddRange(new System.Windows.Forms.ToolStripItem[]{59
this.TSMI_Undo,60
this.TSS_Up,61
this.TSMI_Cut,62
this.TSMI_Copy,63
this.TSMI_Paste,64
this.TSMI_Delete,65
this.TSS_Down,66
this.TSMI_SelectAll67
});68
69
this.InitItemEnableInMyCMS();70
}71
72
/**//// <summary>73
/// 构造函数74
/// </summary>75
/// <param name="myControl">TextBoxBase类实例</param>76
public MyContextMenuStrip(System.Windows.Forms.TextBoxBase myControl)77
: this()78
{79
this.myCMS_Object = myControl;80
81
this.myCMS_Object.MouseDown +=82
new System.Windows.Forms.MouseEventHandler(this.myCMS_Object_MouseDown);83
84
this.myCMS_Object.Click +=85
new System.EventHandler(this.myCMS_Object_Click);86
87
this.Opened +=88
new System.EventHandler(this.myCMS_Opened);89
}90
91
/**//// <summary>92
/// TextBoxBase实例字段93
/// </summary>94
private System.Windows.Forms.TextBoxBase myCMS_Object;95
96
/**//// <summary>97
/// TextBoxBase实例属性98
/// </summary>99
public System.Windows.Forms.TextBoxBase MyCMS_Object100
{101
get { return myCMS_Object; }102
set { myCMS_Object = value; }103
}104
105
/**//// <summary>106
/// 107
/// </summary>108
private int Integer = 0;109
110
/**//// <summary>111
/// 初始化上下文菜单项112
/// </summary>113
private void InitializeComponent()114
{115
// 116
// TSMI_Undo117
// 118
this.TSMI_Undo.Name = "TSMI_Undo";119
this.TSMI_Undo.Size = new System.Drawing.Size(152, 22);120
this.TSMI_Undo.Text = "撤销";121
this.TSMI_Undo.Click += new EventHandler(this.TSMI_Undo_Click);122
// 123
// TSS_Up124
// 125
this.TSS_Up.Name = "TSS_Up";126
this.TSS_Up.Size = new System.Drawing.Size(152, 22);127
// 128
// TSS_Down129
// 130
this.TSS_Down.Name = "TSS_Down";131
this.TSS_Down.Size = new System.Drawing.Size(152, 22);132
// 133
// TSMI_Cut134
// 135
this.TSMI_Cut.Name = "TSMI_Cut";136
this.TSMI_Cut.Size = new System.Drawing.Size(152, 22);137
this.TSMI_Cut.Text = "剪切";138
this.TSMI_Cut.Click += new EventHandler(this.TSMI_Cut_Click);139
// 140
// TSMI_Copy141
// 142
this.TSMI_Copy.Name = "TSMI_Copy";143
this.TSMI_Copy.Size = new System.Drawing.Size(152, 22);144
this.TSMI_Copy.Text = "复制";145
this.TSMI_Copy.Click += new EventHandler(TSMI_Copy_Click);146
// 147
// TSMI_Paste148
// 149
this.TSMI_Paste.Name = "TSMI_Stick";150
this.TSMI_Paste.Size = new System.Drawing.Size(152, 22);151
this.TSMI_Paste.Text = "粘贴";152
this.TSMI_Paste.Click += new EventHandler(this.TSMI_Paste_Click);153
// 154
// TSMI_SelectAll155
// 156
this.TSMI_SelectAll.Name = "TSMI_SelectAll";157
this.TSMI_SelectAll.Size = new System.Drawing.Size(152, 22);158
this.TSMI_SelectAll.Text = "全选";159
this.TSMI_SelectAll.Click += new EventHandler(this.TSMI_SelectAll_Click);160
// 161
// TSMI_Delete162
// 163
this.TSMI_Delete.Name = "TSMI_Delete";164
this.TSMI_Delete.Size = new System.Drawing.Size(152, 22);165
this.TSMI_Delete.Text = "删除";166
this.TSMI_Delete.Click += new EventHandler(this.TSMI_Delete_Click);167
}168
169
/**//// <summary>170
/// 撤销171
/// </summary>172
/// <param name="sender"></param>173
/// <param name="e"></param>174
private void TSMI_Undo_Click(object sender, EventArgs e)175
{176
// Determine if last operation can be undone in text box. 177
if (this.myCMS_Object.CanUndo == true)178
{179
// Undo the last operation.180
this.myCMS_Object.Undo();181
// Clear the undo buffer to prevent last action from being redone.182
this.myCMS_Object.ClearUndo();183
}184
185
}186
187
/**//// <summary>188
/// 剪切189
/// </summary>190
/// <param name="sender"></param>191
/// <param name="e"></param>192
private void TSMI_Cut_Click(object sender, EventArgs e)193
{194
// Ensure that text is currently selected in the text box. 195
if (this.myCMS_Object.SelectedText != "")196
{197
// Cut the selected text in the control and paste it into the Clipboard.198
this.myCMS_Object.Cut();199
}200
}201
202
/**//// <summary>203
/// 复制204
/// </summary>205
/// <param name="sender"></param>206
/// <param name="e"></param>207
private void TSMI_Copy_Click(object sender, EventArgs e)208
{209
if (this.myCMS_Object.SelectionLength > 0)210
{211
this.myCMS_Object.Copy();212
}213
}214
215
/**//// <summary>216
/// 粘贴217
/// </summary>218
/// <param name="sender"></param>219
/// <param name="e"></param>220
private void TSMI_Paste_Click(object sender, EventArgs e)221
{222
// Determine if there is any text in the Clipboard to paste into the text box.223
if (System.Windows.Forms.Clipboard.GetDataObject().GetDataPresent(System.Windows.Forms.DataFormats.Text) == true)224
{225
// Determine if any text is selected in the text box.226
if (this.myCMS_Object.SelectionLength > 0)227
{228
// Ask user if they want to paste over currently selected text.229
if (System.Windows.Forms.MessageBox.Show("Do you want to paste over current selection?", "Cut Example", 230
System.Windows.Forms.MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.No)231
// Move selection to the point after the current selection and paste.232
this.myCMS_Object.SelectionStart = this.myCMS_Object.SelectionStart + this.myCMS_Object.SelectionLength;233
}234
// Paste current text in Clipboard into text box.235
this.myCMS_Object.Paste();236
}237
}238
239
/**//// <summary>240
/// 删除241
/// </summary>242
/// <param name="sender"></param>243
/// <param name="e"></param>244
private void TSMI_Delete_Click(object sender, EventArgs e)245
{246
this.myCMS_Object.SelectedText = string.Empty;247
}248
249
/**//// <summary>250
/// 全选251
/// </summary>252
/// <param name="sender"></param>253
/// <param name="e"></param>254
private void TSMI_SelectAll_Click(object sender, EventArgs e)255
{256
// sender as System.Windows.Forms.TextBoxBase;257
// Determine if any text is selected in the TextBox control.258
if (this.myCMS_Object.SelectionLength == 0)259
// Select all text in the text box.260
this.myCMS_Object.SelectAll();261
262
// Copy the contents of the control to the Clipboard.263
this.myCMS_Object.Copy();264
265
}266
267
/**//// <summary>268
/// 在控件上按下鼠标事件处理方法269
/// </summary>270
/// <param name="sender"></param>271
/// <param name="e"></param>272
private void myCMS_Object_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)273
{274
// this.myCMS_Object.ContextMenuStrip = this;275
(sender as System.Windows.Forms.TextBoxBase).ContextMenuStrip = this;276
}277
278
/**//// <summary>279
/// 单击控件事件处理方法280
/// </summary>281
/// <param name="sender"></param>282
/// <param name="e"></param>283
private void myCMS_Object_Click(object sender, EventArgs e)284
{285
if (this.Integer != 0)286
{287
this.myCMS_Object.SelectAll();288
}289
this.Integer = this.myCMS_Object.SelectionLength;290
}291
292
/**//// <summary>293
/// 为控件设置输入焦点294
/// </summary>295
/// <param name="control">设置控件</param>296
private void ControlSetFocus(System.Windows.Forms.Control control)297
{298
// 如果控件接受焦点，放置焦点到控件中。299
if (control.CanFocus)300
{301
control.Focus();302
}303
}304
305
当上下文菜单弹出事件处理方法#region 当上下文菜单弹出事件处理方法306
307
/**//// <summary>308
/// 当上下文菜单弹出事件处理方法309
/// </summary>310
/// <param name="sender"></param>311
/// <param name="e"></param>312
private void myCMS_Opened(object sender, EventArgs e)313
{314
// 让焦点进入控件this.myCMS_Object315
this.ControlSetFocus(this.myCMS_Object);316
317
this.myCMS_Object_OpenedMethod();318
}319
320
/**//// <summary>321
/// 322
/// </summary>323
private void myCMS_Object_OpenedMethod()324
{325
this.InitItemEnableInMyCMS();326
327
// 如果该控件中能否撤销前一操作328
if (this.myCMS_Object.CanUndo == true)329
{330
this.TSMI_Undo.Enabled = true;331
}332
333
// 如果选中控件中的文本334
if (this.myCMS_Object.SelectedText.Length > 0)335
{336
this.TSMI_Cut.Enabled = true;337
338
this.TSMI_Copy.Enabled = true;339
340
this.TSMI_Delete.Enabled = true;341
}342
343
// 如果剪切板中有文本字符344
if (System.Windows.Forms.Clipboard.GetText().Length > 0)345
{346
this.TSMI_Paste.Enabled = true;347
}348
349
// 如果控件中不为空，则全选按钮使能为true350
if (this.myCMS_Object.TextLength > 0)351
{352
this.TSMI_SelectAll.Enabled = true;353
}354
355
}356
357
#endregion 当上下文菜单弹出事件处理方法358
359
/**//// <summary>360
/// 初始化选项按钮使能为false361
/// </summary>362
private void InitItemEnableInMyCMS()363
{364
try365
{366
foreach (System.Windows.Forms.ToolStripItem item in this.Items)367
{368
// 因为this.Items中有分隔条TSS（ToolStripSeparator）类，369
// 与TSMI（ToolStripMenuItem）不同类，但由TSI（ToolStripItem）类直接和间接派生得来，370
// 所以做如下判断，若是TSS类，无使能属性。371
if(item is System.Windows.Forms.ToolStripMenuItem)372
item.Enabled = false;373
}374
}375
catch (InvalidCastException ICex)376
{377
}378
}379
}