VB.net 2010 视频教程 VB.net 2010 视频教程 VB.net 2010 视频教程

  • c#教程之C#自定义DataGridViewColumn显示TreeView

  • 2018-04-24 19:48 来源：未知

新疆25选7开奖号码 www.d1dx0.cn 我们可以自定义DataGridView的DataGridViewColumn来实现自定义的列，下面介绍一下如何通过扩展DataGridViewColumn来实现一个TreeViewColumn

1.TreeViewColumn类

　TreeViewColumn继承自DataGridViewColumn，为了动态给TreeViewColumn传入一个TreeView，这里暴露出一个公共属性_root，可以绑定一个初始化的TreeView. 另外需要重写DataGridCell类型的CellTemplate，这里返还一个TreeViewCell（需要自定义） 

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
/// <summary>
 /// Host TreeView In DataGridView Cell
 /// </summary>
 public class TreeViewColumn : DataGridViewColumn
 {
  public TreeViewColumn()
   : base(new TreeViewCell())
  {
  }
  [Description("Set TreeView Root in DataGridView Cell"), Category("TreeView")]
  public TreeView _root
  {
   get{return Roots.tree;}
   set{Roots.tree=value;}
  }
  public override DataGridViewCell CellTemplate
  {
   get
   {
    return base.CellTemplate;
   }
   set
   {
    // Ensure that the cell used for the template is a TreeViewCell.
    if (value != null &&
     !value.GetType().IsAssignableFrom(typeof(TreeViewCell)))
    {
     throw new InvalidCastException("Must be a TreeViewCell");
    }
    base.CellTemplate = value;
   }
  }
 }

2.TreeViewCell类

  　　上面TreeViewColumn重写了CellTemplate，返回的就是自定义的TreeViewCell，这里就是具体实现其逻辑。一般来说选择树控件的节点后，返回的是一个文本信息，是文本类型，可以继承DataGridViewTextBoxCell,并重写InitializeEditingControl来进行自定义的DataGridView.EditingControl （编辑控件）。

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
public class TreeViewCell : DataGridViewTextBoxCell
 {
  public TreeViewCell()
   : base()
  {
   //初始设置
  }
  public override void InitializeEditingControl(int rowIndex, object
   initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
  {
   // Set the value of the editing control to the current cell value.
   base.InitializeEditingControl(rowIndex, initialFormattedValue,
    dataGridViewCellStyle);
   TreeViewEditingControl ctl =
    DataGridView.EditingControl as TreeViewEditingControl;
   // Use the default row value when Value property is null.
   if (this.Value == null)
   {
    ctl.SelectedNode =new TreeNode( this.DefaultNewRowValue.ToString());
   }
   else
   {
    ctl.SelectedNode = new TreeNode(this.Value.ToString());
   }
  }
  public override Type EditType
  {
   get
   {
    // Return the type of the editing control that CalendarCell uses.
    return typeof(TreeViewEditingControl);
   }
  }
  public override Type ValueType
  {
   get
   {
    // Return the type of the value that CalendarCell contains.
    return typeof(String);
   }
  }
  public override object DefaultNewRowValue
  {
   get
   {
    // Use the current date and time as the default value.
    return "";
   }
  }
 }

3.TreeViewEditingControl类

　　TreeViewEditingControl为编辑控件，当用户编辑TreeViewCell时，显示的为树编辑控件，需要继承TreeView，同时实现IDataGridViewEditingControl接口，实现以下方法：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
public class TreeViewEditingControl : TreeView, IDataGridViewEditingControl
 {
  DataGridView dataGridView;
  private bool valueChanged = false;
  int rowIndex;
  public TreeViewEditingControl()
  {
   try
   {
    //必须加Roots.tree.Nodes[].Clone() 否则报错 不能在多处增添或插入项，必须首先将其从当前位置移除或将其克隆
    this.Nodes.Add(Roots.tree.Nodes[].Clone() as TreeNode);
    this.SelectedNode = this.Nodes[];
   }
   catch (Exception ex)
   {
    MessageBox.Show(ex.Message);
   }
  }
  // Implements the IDataGridViewEditingControl.EditingControlFormattedValue
  // property.
  public object EditingControlFormattedValue
  {
   get
   {
    return this.SelectedNode.Text;
   }
   set
   {
    if (value is String)
    {
     try
     {
      // This will throw an exception of the string is
      // null, empty, or not in the format of a date.
      this.SelectedNode = new TreeNode((String)value);
     }
     catch
     {
      // In the case of an exception, just use the
      // default value so we're not left with a null
      // value.
      this.SelectedNode = new TreeNode("");
     }
    }
   }
  }
  // Implements the
  // IDataGridViewEditingControl.GetEditingControlFormattedValue method.
  public object GetEditingControlFormattedValue(
   DataGridViewDataErrorContexts context)
  {
   return EditingControlFormattedValue;
  }
  // Implements the
  // IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
  public void ApplyCellStyleToEditingControl(
   DataGridViewCellStyle dataGridViewCellStyle)
  {
   this.Font = dataGridViewCellStyle.Font;
   this.ForeColor = dataGridViewCellStyle.ForeColor;
   this.BackColor = dataGridViewCellStyle.BackColor;
  }
  // Implements the IDataGridViewEditingControl.EditingControlRowIndex
  // property.
  public int EditingControlRowIndex
  {
   get
   {
    return rowIndex;
   }
   set
   {
    rowIndex = value;
   }
  }
  // Implements the IDataGridViewEditingControl.EditingControlWantsInputKey
  // method.
  public bool EditingControlWantsInputKey(
   Keys key, bool dataGridViewWantsInputKey)
  {
   // Let the TreeViewPicker handle the keys listed.
   switch (key & Keys.KeyCode)
   {
    case Keys.Left:
    case Keys.Up:
    case Keys.Down:
    case Keys.Right:
    case Keys.Home:
    case Keys.End:
    case Keys.PageDown:
    case Keys.PageUp:
     return true;
    default:
     return !dataGridViewWantsInputKey;
   }
  }
  // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
  // method.
  public void PrepareEditingControlForEdit(bool selectAll)
  {
   // No preparation needs to be done.
  }
  // Implements the IDataGridViewEditingControl
  // .RepositionEditingControlOnValueChange property.
  public bool RepositionEditingControlOnValueChange
  {
   get
   {
    return false;
   }
  }
  // Implements the IDataGridViewEditingControl
  // .EditingControlDataGridView property.
  public DataGridView EditingControlDataGridView
  {
   get
   {
    return dataGridView;
   }
   set
   {
    dataGridView = value;
   }
  }
  // Implements the IDataGridViewEditingControl
  // .EditingControlValueChanged property.
  public bool EditingControlValueChanged
  {
   get
   {
    return valueChanged;
   }
   set
   {
    valueChanged = value;
   }
  }
  // Implements the IDataGridViewEditingControl
  // .EditingPanelCursor property.
  public Cursor EditingPanelCursor
  {
   get
   {
    return base.Cursor;
   }
  }
  protected override void OnAfterExpand(TreeViewEventArgs e)
  {
   base.OnAfterExpand(e);
   this.dataGridView.Columns[this.dataGridView.CurrentCell.ColumnIndex].Width = this.Width+;
   this.dataGridView.Rows[this.dataGridView.CurrentCell.RowIndex].Height = this.Height+;
  }
  protected override void OnAfterSelect(TreeViewEventArgs e)
  {
   // Notify the DataGridView that the contents of the cell
   // have changed.
   valueChanged = true;
   this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
   base.OnAfterSelect(e);
  }
 }

　　为了在不同类之间传递参数，定义一个全局静态类：

?
1
2
3
4
5
6
7
8
/// <summary>
 /// 静态类的静态属性，用于在不同class间传递参数
 /// </summary>
 public static class Roots
 {
  //从前台绑定树
 public static TreeView tree = null;
 }

完整代码为：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.ComponentModel;
namespace Host_Controls_in_Windows_Forms_DataGridView_Cells
{
 /// <summary>
 /// 静态类的静态属性，用于在不同class间传递参数
 /// </summary>
 public static class Roots
 {
  //从前台绑定树
  public static TreeView tree = null;
 }
 /// <summary>
 /// Host TreeView In DataGridView Cell
 /// </summary>
 public class TreeViewColumn : DataGridViewColumn
 {
  public TreeViewColumn()
   : base(new TreeViewCell())
  {
  }
  [Description("Set TreeView Root in DataGridView Cell"), Category("TreeView")]
  public TreeView _root
  {
   get{return Roots.tree;}
   set{Roots.tree=value;}
  }
  public override DataGridViewCell CellTemplate
  {
   get
   {
    return base.CellTemplate;
   }
   set
   {
    // Ensure that the cell used for the template is a TreeViewCell.
    if (value != null &&
     !value.GetType().IsAssignableFrom(typeof(TreeViewCell)))
    {
     throw new InvalidCastException("Must be a TreeViewCell");
    }
    base.CellTemplate = value;
   }
  }
 }
 //----------------------------------------------------------------------
 public class TreeViewCell : DataGridViewTextBoxCell
 {
  public TreeViewCell()
   : base()
  {
   //初始设置
  }
  public override void InitializeEditingControl(int rowIndex, object
   initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
  {
   // Set the value of the editing control to the current cell value.
   base.InitializeEditingControl(rowIndex, initialFormattedValue,
    dataGridViewCellStyle);
   TreeViewEditingControl ctl =
    DataGridView.EditingControl as TreeViewEditingControl;
   // Use the default row value when Value property is null.
   if (this.Value == null)
   {
    ctl.SelectedNode =new TreeNode( this.DefaultNewRowValue.ToString());
   }
   else
   {
    ctl.SelectedNode = new TreeNode(this.Value.ToString());
   }
  }
  public override Type EditType
  {
   get
   {
    // Return the type of the editing control that CalendarCell uses.
    return typeof(TreeViewEditingControl);
   }
  }
  public override Type ValueType
  {
   get
   {
    // Return the type of the value that CalendarCell contains.
    return typeof(String);
   }
  }
  public override object DefaultNewRowValue
  {
   get
   {
    // Use the current date and time as the default value.
    return "";
   }
  }
 }
 //-----------------------------------------------------------------
public class TreeViewEditingControl : TreeView, IDataGridViewEditingControl
 {
  DataGridView dataGridView;
  private bool valueChanged = false;
  int rowIndex;
  public TreeViewEditingControl()
  {
   try
   {
    //必须加Roots.tree.Nodes[].Clone() 否则报错 不能在多处增添或插入项，必须首先将其从当前位置移除或将其克隆
    this.Nodes.Add(Roots.tree.Nodes[].Clone() as TreeNode);
    this.SelectedNode = this.Nodes[];
   }
   catch (Exception ex)
   {
    MessageBox.Show(ex.Message);
   }
  }
  // Implements the IDataGridViewEditingControl.EditingControlFormattedValue
  // property.
  public object EditingControlFormattedValue
  {
   get
   {
    return this.SelectedNode.Text;
   }
   set
   {
    if (value is String)
    {
     try
     {
      // This will throw an exception of the string is
      // null, empty, or not in the format of a date.
      this.SelectedNode = new TreeNode((String)value);
     }
     catch
     {
      // In the case of an exception, just use the
      // default value so we're not left with a null
      // value.
      this.SelectedNode = new TreeNode("");
     }
    }
   }
  }
  // Implements the
  // IDataGridViewEditingControl.GetEditingControlFormattedValue method.
  public object GetEditingControlFormattedValue(
   DataGridViewDataErrorContexts context)
  {
   return EditingControlFormattedValue;
  }
  // Implements the
  // IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
  public void ApplyCellStyleToEditingControl(
   DataGridViewCellStyle dataGridViewCellStyle)
  {
   this.Font = dataGridViewCellStyle.Font;
   this.ForeColor = dataGridViewCellStyle.ForeColor;
   this.BackColor = dataGridViewCellStyle.BackColor;
  }
  // Implements the IDataGridViewEditingControl.EditingControlRowIndex
  // property.
  public int EditingControlRowIndex
  {
   get
   {
    return rowIndex;
   }
   set
   {
    rowIndex = value;
   }
  }
  // Implements the IDataGridViewEditingControl.EditingControlWantsInputKey
  // method.
  public bool EditingControlWantsInputKey(
   Keys key, bool dataGridViewWantsInputKey)
  {
   // Let the TreeViewPicker handle the keys listed.
   switch (key & Keys.KeyCode)
   {
    case Keys.Left:
    case Keys.Up:
    case Keys.Down:
    case Keys.Right:
    case Keys.Home:
    case Keys.End:
    case Keys.PageDown:
    case Keys.PageUp:
     return true;
    default:
     return !dataGridViewWantsInputKey;
   }
  }
  // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
  // method.
  public void PrepareEditingControlForEdit(bool selectAll)
  {
   // No preparation needs to be done.
  }
  // Implements the IDataGridViewEditingControl
  // .RepositionEditingControlOnValueChange property.
  public bool RepositionEditingControlOnValueChange
  {
   get
   {
    return false;
   }
  }
  // Implements the IDataGridViewEditingControl
  // .EditingControlDataGridView property.
  public DataGridView EditingControlDataGridView
  {
   get
   {
    return dataGridView;
   }
   set
   {
    dataGridView = value;
   }
  }
  // Implements the IDataGridViewEditingControl
  // .EditingControlValueChanged property.
  public bool EditingControlValueChanged
  {
   get
   {
    return valueChanged;
   }
   set
   {
    valueChanged = value;
   }
  }
  // Implements the IDataGridViewEditingControl
  // .EditingPanelCursor property.
  public Cursor EditingPanelCursor
  {
   get
   {
    return base.Cursor;
   }
  }
  protected override void OnAfterExpand(TreeViewEventArgs e)
  {
   base.OnAfterExpand(e);
   this.dataGridView.Columns[this.dataGridView.CurrentCell.ColumnIndex].Width = this.Width+;
   this.dataGridView.Rows[this.dataGridView.CurrentCell.RowIndex].Height = this.Height+;
  }
  protected override void OnAfterSelect(TreeViewEventArgs e)
  {
   // Notify the DataGridView that the contents of the cell
   // have changed.
   valueChanged = true;
   this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
   base.OnAfterSelect(e);
  }
 }
}
  • 【砥砺奋进的5年】空气质量优良 "南宁蓝"常驻绿城 2019-02-17
  • 机关党建工作巡礼——广东“走前头作表率” 2019-02-17
  • 为什么说一直辛苦劳作的农民没有富起来？而不说一直勤劳的农民没有富起来？ 2019-02-17
  • 中欧美六国商会签约 国际战略合作在石达成 2019-02-17
  • 【专题】走龙江丝路 向北看发展 华南城 全国重点网媒龙江集中采访活动 2019-02-16
  • 彩民复式追加投注 斩获体彩大乐透1425万 2019-02-16
  • 多彩课堂熔铸红色魂——甘祖昌干部学院教学素描 2019-02-16
  • 张佳宁杂志玩转新娘风 甜系女生展俏皮魅力 2019-02-15
  • 中央调剂制度促进养老保险制度可持续发展 2019-02-15
  • 西安高科工程技术学校——陕西省政府直属中等职业院校西安高科工程技术学校2018招生简章-陕西教育新闻 2019-02-14
  • 旅游低价团暗藏玄机 治理需保持高压态势--旅游频道 2019-02-14
  • 【高清】傈僳族乡村女教师熊文碧：背着娃娃教书 2019-02-13
  • QS世界大学排名发布：中国11所大学进百强，清华排名创历史 2019-02-13
  • 辽宁贯彻十九大精神：领导沉下去 群众用心学 2019-02-13
  • 多部门三令五申禁网售彩票，世界杯竞猜APP上仍热卖 2019-02-12
    • 207| 749| 426| 601| 567| 399| 301| 440| 177| 562|