关于TextBox的AutoComplete功能断断续续搞了一段时间，之前写过几个类似的自定义控件，包括TextBox自带的，但是效果不是很好。刚好项目需要，结合原来的思路重新写了一个相对比较好用的版本。
废话不多说，直接贴代码吧。下拉的控件我用的DevExpress的GridControl，比较美观。可以根据自己的需要改成DataGridView或者ListView。
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Windows.Forms;
9 using DevExpress.XtraGrid;
10 using DevExpress.XtraGrid.Views.Grid;
11
12 namespace TestAutoComplete
13 {
14 public partial class AutoTextBoxNew : TextBox
15 {
16 private string[] _keys;
17 private SearchMode _searchMode;
18 private List<BaseItem> items = new List<BaseItem>();
19 private GridView _view;
20 private GridControl _grid;
21 private int _gvWidth = 200;
22 private int _gvHeight = 200;
23 private DataTable _dtlData = null;//绑定的数据源
24 private Control _form;
25 private string _needValue;
26 private string _needName;
27 private bool _isSearch = true;
28 private bool _isShowAllData = false;
29
30 #region 属性
31 [TypeConverter(typeof(System.ComponentModel.CollectionConverter))]
32 [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
33 [Category("样式")]
34 [Description("绑定列")]
35 public List<BaseItem> Items
36 {
37 get
38 { return items; }
39 }
40
41 [Category("样式")]
42 [Description("模糊查找关键字")]
43 public string[] SearchKey
44 {
45 get { return _keys;}
46 set { _keys = value; }
47 }
48
49 [Category("样式")]
50 [Description("赋值在文本框的tag里，对应数据源的字段名称")]
51 public string NeedValue
52 {
53 get { return _needValue; }
54 set { _needValue = value; }
55 }
56
57 [Category("样式")]
58 [Description("赋值在文本框上的内容,对应数据源的字段名称")]
59 public string NeedName
60 {
61 get { return _needName; }
62 set { _needName = value; }
63 }
64
65 [Category("样式")]
66 [Description("模糊查找的方式，有左模糊、右模糊、全模糊")]
67 public SearchMode SearchModel
68 {
69 get { return _searchMode; }
70 set
71 {
72 _searchMode = value;
73 }
74 }
75
76 [Category("样式")]
77 [Description("GridView宽度")]
78 public int GridViewWidth
79 {
80 get { return _gvWidth; }
81 set
82 {
83 _gvWidth = value;
84 }
85 }
86
87 [Category("样式")]
88 [Description("GridView高度")]
89 public int GridViewHeight
90 {
91 get { return _gvHeight; }
92 set
93 {
94 _gvHeight = value;
95 }
96 }
97
98 [Category("样式")]
99 [Description("当未输入查询条件时是否全显示数据")]
100 public bool IsShowAllData
101 {
102 get { return _isShowAllData; }
103 set
104 {
105 _isShowAllData = value;
106 }
107 }
108
109 #endregion
110
111 /// <summary>
112 /// 构造函数
113 /// </summary>
114 public AutoTextBoxNew()
115 {
116 InitializeComponent();
117 _grid = new GridControl();
118 }
119
120 /// <summary>
121 /// 初始化
122 /// </summary>
123 /// <param name="dtlSource"></param>
124 public void Init(DataTable dtlSource)
125 {
126 _dtlData = dtlSource;
127 initListView();
128 }
129
130 /// <summary>
131 /// 初始化GridView
132 /// </summary>
133 private void initListView()
134 {
135 if (items != null)
136 {
137 try
138 {
139 _view = new GridView();
140 _view.OptionsView.ShowGroupPanel = false;
141 _view.OptionsBehavior.Editable = false;
142 _view.OptionsView.ColumnAutoWidth = false;
143 _grid.KeyDown += new KeyEventHandler(_grid_KeyDown);
144 _grid.MouseDoubleClick += new MouseEventHandler(_grid_MouseDoubleClick);
145 _grid.Leave += new EventHandler(_grid_Leave);
146 foreach (BaseItem item in items)
147 {
148 DevExpress.XtraGrid.Columns.GridColumn col = new DevExpress.XtraGrid.Columns.GridColumn();
149
150 col.FieldName = item.FieldCode;
151 col.Caption = item.DisplayName;
152 col.Width = item.ColumnWidth == 0 ? 100 : item.ColumnWidth;
153 col.Visible = true;
154 _view.Columns.Add(col);
155 }
156 _grid.MainView = _view;
157 _grid.Width = _gvWidth;
158 _grid.Height = _gvHeight;
159 _form = this.Parent;
160 while (true)
161 {
162 if (_form.Parent == null) break;
163 _form = _form.Parent;
164 }
165 _grid.Location = _form.PointToClient(this.Parent.PointToScreen(new Point(this.Left, this.Top + this.Height + 3)));
166 _form.Controls.Add(_grid);
167 _grid.Visible = false;
168 }
169 catch
170 {
171
172 }
173 }
174 }
175
176 /// <summary>
177 /// GridView焦点离开
178 /// </summary>
179 /// <param name="sender"></param>
180 /// <param name="e"></param>
181 public void _grid_Leave(object sender, EventArgs e)
182 {
183 if (!this.Focused)
184 {
185 _grid.Visible = false;
186 }
187 }
188
189 /// <summary>
190 /// GridView双击事件，赋值
191 /// </summary>
192 /// <param name="sender"></param>
193 /// <param name="e"></param>
194 public void _grid_MouseDoubleClick(object sender, MouseEventArgs e)
195 {
196 if (_view.FocusedRowHandle >= 0)
197 {
198 _isSearch = false;
199 this.Tag = _view.GetFocusedRowCellValue(_needValue).ToString();
200 this.Text = _view.GetFocusedRowCellValue(_needName).ToString();
201 _grid.Visible = false;
202 }
203 }
204
205 /// <summary>
206 /// GridView回车事件，赋值
207 /// </summary>
208 /// <param name="sender"></param>
209 /// <param name="e"></param>
210 public void _grid_KeyDown(object sender, KeyEventArgs e)
211 {
212 if (e.KeyCode == Keys.Enter)
213 {
214 if (_view.FocusedRowHandle >= 0)
215 {
216 _isSearch = false;
217 this.Tag = _view.GetFocusedRowCellValue(_needValue).ToString();
218 this.Text = _view.GetFocusedRowCellValue(_needName).ToString();
219 _grid.Visible = false;
220 }
221 }
222 }
223
224 protected override void OnPaint(PaintEventArgs pe)
225 {
226 base.OnPaint(pe);
227 }
228
229 protected override void OnTextChanged(EventArgs e)
230 {
231 if (this.Text != "")
232 {
233 if (_isSearch)
234 {
235 DataTable dt = Search(this.Text);
236 _grid.DataSource = dt;
237 _grid.Visible = true;
238 _grid.BringToFront();
239 }
240 else
241 {
242 _isSearch = true;
243 }
244
245 }
246 else
247 {
248 if (_isShowAllData)
249 {
250 _grid.DataSource = _dtlData;
251 _grid.Visible = true;
252 _grid.BringToFront();
253 }
254 else
255 {
256 _grid.Visible = false;
257 }
258 }
259 base.OnTextChanged(e);
260 }
261
262 protected override void OnKeyDown(KeyEventArgs e)
263 {
264 if (e.KeyCode == Keys.Down)
265 {
266 _grid.Focus();
267 }
268 else if (e.KeyCode == Keys.Enter)
269 {
270 if (_grid.DataSource != null)
271 {
272 _isSearch = false;
273 this.Tag = _view.GetRowCellValue(0, _needValue).ToString();
274 this.Text = _view.GetRowCellValue(0, _needName).ToString();
275 _grid.Visible = false;
276 }
277 }
278 base.OnKeyDown(e);
279 }
280
281 /// <summary>
282 /// 检索
283 /// </summary>
284 /// <param name="keyvalue"></param>
285 /// <returns></returns>
286 private DataTable Search(string keyvalue)
287 {
288 DataTable dtlReturn = null;
289 if (_dtlData != null && _keys.Length > 0)
290 {
291 string filters = "";
292 foreach (string str in _keys)
293 {
294 switch (_searchMode)
295 {
296 case SearchMode.Left:
297 filters += "or " + str + " like‘%" + keyvalue + "‘ ";
298 break;
299 case SearchMode.Right:
300 filters += "or " + str + " like‘" + keyvalue + "%‘ ";
301 break;
302 case SearchMode.All:
303 filters += "or " + str + " like‘%" + keyvalue + "%‘ ";
304 break;
305 }
306 }
307 filters = filters.Substring(2, filters.Length - 2);
308 DataRow[] dr = _dtlData.Select(filters);
309 if (dr.Length > 0)
310 {
311 dtlReturn = dr.CopyToDataTable();
312 }
313 }
314 return dtlReturn;
315 }
316
317 /// <summary>
318 /// 焦点离开隐藏起来
319 /// </summary>
320 /// <param name="e"></param>
321 protected override void OnLeave(EventArgs e)
322 {
323 if (!_grid.IsFocused)
324 {
325 _grid.Visible = false;
326 }
327 base.OnLeave(e);
328 }
329
330 }
331
332 public class BaseItem
333 {
334 public string DisplayName
335 { get; set; }
336 public string FieldCode
337 { get; set; }
338 public int ColumnWidth
339 { get; set; }
340 }
341
342 public enum SearchMode { Left, Right, All }
343 }
调用比较简单，需要配置一些属性，如图：
Items主要设置需要显示哪些列，NeedName与NeedValue必须配置一下，赋值的时候需要用到。
最后调用一下初始化的方法把数据源传入就OK了
autoTextBoxNew1.Init(ds.Tables[0]);
看看效果图：
本人才疏学浅，如发现文中有误欢迎交流指出
时间： 2024-08-03 11:15:32