前提入行已經7,8年了，一直想做一套漂亮點的自定義控制項，於是就有了本系列文章。開源地址：https://gitee.com/kwwwvagaa/net_winform_custom_control 如果覺得寫的還行，請點個 star 支持一下吧歡迎前來交流探討：企鵝群568015492 目錄 ...

前提

入行已經7,8年了，一直想做一套漂亮點的自定義控制項，於是就有了本系列文章。

開源地址：https://gitee.com/kwwwvagaa/net_winform_custom_control

如果覺得寫的還行，請點個 star 支持一下吧

歡迎前來交流探討：企鵝群568015492

準備工作

此控制項用到了停靠窗體和日期控制項的一個面板，以及基類控制項，如果你還對此不瞭解，請移步

（一）c#Winform自定義控制項-基類控制項

（十九）c#Winform自定義控制項-停靠窗體

（三十三）c#Winform自定義控制項-日期控制項

開始

添加一個用戶控制項，命名UCComboBox，繼承自UCControlBase

屬性

  1 Color _ForeColor = Color.FromArgb(64, 64, 64);
  2         [Description("文字顏色"), Category("自定義")]
  3         public override Color ForeColor
  4         {
  5             get
  6             {
  7                 return _ForeColor;
  8             }
  9             set
 10             {
 11                 _ForeColor = value;
 12                 lblInput.ForeColor = value;
 13                 txtInput.ForeColor = value;
 14             }
 15         }
 16 
 17         public event EventHandler SelectedChangedEvent;
 18         public event EventHandler TextChangedEvent;
 19 
 20         private ComboBoxStyle _BoxStyle = ComboBoxStyle.DropDown;
 21 
 22         [Description("控制項樣式"), Category("自定義")]
 23         public ComboBoxStyle BoxStyle
 24         {
 25             get { return _BoxStyle; }
 26             set
 27             {
 28                 _BoxStyle = value;
 29                 if (value == ComboBoxStyle.DropDownList)
 30                 {
 31                     lblInput.Visible = true;
 32                     txtInput.Visible = false;
 33                 }
 34                 else
 35                 {
 36                     lblInput.Visible = false;
 37                     txtInput.Visible = true;
 38                 }
 39 
 40                 if (this._BoxStyle == ComboBoxStyle.DropDownList)
 41                 {
 42                     txtInput.BackColor = _BackColor;
 43                     base.FillColor = _BackColor;
 44                     base.RectColor = _BackColor;
 45                 }
 46                 else
 47                 {
 48                     txtInput.BackColor = Color.White;
 49                     base.FillColor = Color.White;
 50                     base.RectColor = Color.FromArgb(220, 220, 220);
 51                 }
 52             }
 53         }
 54 
 55         private Font _Font = new Font("微軟雅黑", 12);
 56         [Description("字體"), Category("自定義")]
 57         public new Font Font
 58         {
 59             get { return _Font; }
 60             set
 61             {
 62                 _Font = value;
 63                 lblInput.Font = value;
 64                 txtInput.Font = value;
 65                 txtInput.PromptFont = value;
 66                 this.txtInput.Location = new Point(this.txtInput.Location.X, (this.Height - txtInput.Height) / 2);
 67                 this.lblInput.Location = new Point(this.lblInput.Location.X, (this.Height - lblInput.Height) / 2);
 68             }
 69         }
 70 
 71 
 72         [Obsolete("不再可用的屬性")]
 73         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
 74         private new Color FillColor
 75         {
 76             get;
 77             set;
 78         }
 79 
 80         [Obsolete("不再可用的屬性")]
 81         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
 82         private new Color RectColor
 83         {
 84             get;
 85             set;
 86         }
 87 
 88         private string _TextValue;
 89 
 90         public string TextValue
 91         {
 92             get { return _TextValue; }
 93             set
 94             {
 95                 _TextValue = value;
 96                 if (lblInput.Text != value)
 97                     lblInput.Text = value;
 98                 if (txtInput.Text != value)
 99                     txtInput.Text = value;
100             }
101         }
102 
103         private List<KeyValuePair<string, string>> _source = null;
104 
105         public List<KeyValuePair<string, string>> Source
106         {
107             get { return _source; }
108             set
109             {
110                 _source = value;
111                 _selectedIndex = -1;
112                 _selectedValue = "";
113                 _selectedItem = new KeyValuePair<string, string>();
114                 _selectedText = "";
115                 lblInput.Text = "";
116                 txtInput.Text = "";
117             }
118         }
119 
120         private KeyValuePair<string, string> _selectedItem = new KeyValuePair<string, string>();
121 
122         private int _selectedIndex = -1;
123 
124         public int SelectedIndex
125         {
126             get
127             {
128                 return _selectedIndex;
129             }
130             set
131             {
132                 if (value < 0 || _source == null || _source.Count <= 0 || value >= _source.Count)
133                 {
134                     _selectedIndex = -1;
135                     _selectedValue = "";
136                     _selectedItem = new KeyValuePair<string, string>();
137                     SelectedText = "";
138                 }
139                 else
140                 {
141                     _selectedIndex = value;
142                     _selectedItem = _source[value];
143                     _selectedValue = _source[value].Key;
144                     SelectedText = _source[value].Value;
145                 }
146             }
147         }
148 
149         private string _selectedValue = "";
150 
151         public string SelectedValue
152         {
153             get
154             {
155                 return _selectedValue;
156             }
157             set
158             {
159                 if (_source == null || _source.Count <= 0)
160                 {
161                     SelectedText = "";
162                     _selectedValue = "";
163                     _selectedIndex = -1;
164                     _selectedItem = new KeyValuePair<string, string>();
165                 }
166                 else
167                 {
168                     for (int i = 0; i < _source.Count; i++)
169                     {
170                         if (_source[i].Key == value)
171                         {
172                             _selectedValue = value;
173                             _selectedIndex = i;
174                             _selectedItem = _source[i];
175                             SelectedText = _source[i].Value;
176                             return;
177                         }
178                     }
179                     _selectedValue = "";
180                     _selectedIndex = -1;
181                     _selectedItem = new KeyValuePair<string, string>();
182                     SelectedText = "";
183                 }
184             }
185         }
186 
187         private string _selectedText = "";
188 
189         public string SelectedText
190         {
191             get { return _selectedText; }
192             private set
193             {
194                 _selectedText = value;
195                 lblInput.Text = _selectedText;
196                 txtInput.Text = _selectedText;
197                 if (SelectedChangedEvent != null)
198                 {
199                     SelectedChangedEvent(this, null);
200                 }
201             }
202         }
203 
204         private int _ItemWidth = 70;
205 
206         public int ItemWidth
207         {
208             get { return _ItemWidth; }
209             set { _ItemWidth = value; }
210         }
211 
212         private int _dropPanelHeight = -1;
213 
214         public int DropPanelHeight
215         {
216             get { return _dropPanelHeight; }
217             set { _dropPanelHeight = value; }
218         }
219         [Obsolete("不再可用的屬性,如需要改變背景色，請使用BackColorExt")]
220         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
221         private new Color BackColor
222         {
223             get
224             {
225                 return base.BackColor;
226             }
227             set
228             {
229                 base.BackColor = Color.Transparent;
230             }
231         }
232 
233         private Color _BackColor = Color.FromArgb(240, 240, 240);
234 
235         public Color BackColorExt
236         {
237             get
238             {
239                 return _BackColor;
240             }
241             set
242             {
243                 if (value == Color.Transparent)
244                     return;
245                 _BackColor = value;
246                 lblInput.BackColor = value;
247 
248                 if (this._BoxStyle == ComboBoxStyle.DropDownList)
249                 {
250                     txtInput.BackColor = value;
251                     base.FillColor = value;
252                     base.RectColor = value;
253                 }
254                 else
255                 {
256                     txtInput.BackColor = Color.White;
257                     base.FillColor = Color.White;
258                     base.RectColor = Color.FromArgb(220, 220, 220);
259                 }
260             }
261         }

構造函數初始化處理

 1  public UCComboBox()
 2         {
 3             InitializeComponent();
 4             lblInput.BackColor = _BackColor;
 5             if (this._BoxStyle == ComboBoxStyle.DropDownList)
 6             {
 7                 txtInput.BackColor = _BackColor;
 8                 base.FillColor = _BackColor;
 9                 base.RectColor = _BackColor;
10             }
11             else
12             {
13                 txtInput.BackColor = Color.White;
14                 base.FillColor = Color.White;
15                 base.RectColor = Color.FromArgb(220, 220, 220);
16             }
17             base.BackColor = Color.Transparent;
18         }

一些事件處理

 1 private void UCComboBox_SizeChanged(object sender, EventArgs e)
 2         {
 3             this.txtInput.Location = new Point(this.txtInput.Location.X, (this.Height - txtInput.Height) / 2);
 4             this.lblInput.Location = new Point(this.lblInput.Location.X, (this.Height - lblInput.Height) / 2);
 5         }
 6 
 7         private void txtInput_TextChanged(object sender, EventArgs e)
 8         {
 9             TextValue = txtInput.Text;
10             if (TextChangedEvent != null)
11             {
12                 TextChangedEvent(this, null);
13             }
14         }
15 
16         private void click_MouseDown(object sender, MouseEventArgs e)
17         {
18             if (_frmAnchor == null || _frmAnchor.IsDisposed || _frmAnchor.Visible == false)
19             {
20 
21                 if (this.Source != null && this.Source.Count > 0)
22                 {
23                     int intRow = 0;
24                     int intCom = 1;
25                     var p = this.PointToScreen(this.Location);
26                     while (true)
27                     {
28                         int intScreenHeight = Screen.PrimaryScreen.Bounds.Height;
29                         if ((p.Y + this.Height + this.Source.Count / intCom * 50 < intScreenHeight || p.Y - this.Source.Count / intCom * 50 > 0)
30                             && (_dropPanelHeight <= 0 ? true : (this.Source.Count / intCom * 50 <= _dropPanelHeight)))
31                         {
32                             intRow = this.Source.Count / intCom + (this.Source.Count % intCom != 0 ? 1 : 0);
33                             break;
34                         }
35                         intCom++;
36                     }
37                     UCTimePanel ucTime = new UCTimePanel();
38                     ucTime.IsShowBorder = true;
39                     int intWidth = this.Width / intCom;
40                     if (intWidth < _ItemWidth)
41                         intWidth = _ItemWidth;
42                     Size size = new Size(intCom * intWidth, intRow * 50);
43                     ucTime.Size = size;
44                     ucTime.FirstEvent = true;
45                     ucTime.SelectSourceEvent += ucTime_SelectSourceEvent;
46                     ucTime.Row = intRow;
47                     ucTime.Column = intCom;
48                     List<KeyValuePair<string, string>> lst = new List<KeyValuePair<string, string>>();
49                     foreach (var item in this.Source)
50                     {
51                         lst.Add(new KeyValuePair<string, string>(item.Key, item.Value));
52                     }
53                     ucTime.Source = lst;
54 
55                     ucTime.SetSelect(_selectedValue);
56 
57                     _frmAnchor = new Forms.FrmAnchor(this, ucTime);
58                     _frmAnchor.Load += (a, b) => { (a as Form).Size = size; };
59 
60                     _frmAnchor.Show(this.FindForm());
61 
62                 }
63             }
64             else
65             {
66                 _frmAnchor.Close();
67             }
68         }
69 
70 
71         Forms.FrmAnchor _frmAnchor;
72         void ucTime_SelectSourceEvent(object sender, EventArgs e)
73         {
74             if (_frmAnchor != null && !_frmAnchor.IsDisposed && _frmAnchor.Visible)
75             {
76                 SelectedValue = sender.ToString();
77                 _frmAnchor.Close();
78             }
79         }
80 
81         private void UCComboBox_Load(object sender, EventArgs e)
82         {
83             if (this._BoxStyle == ComboBoxStyle.DropDownList)
84             {
85                 txtInput.BackColor = _BackColor;
86                 base.FillColor = _BackColor;
87                 base.RectColor = _BackColor;
88             }
89             else
90             {
91                 txtInput.BackColor = Color.White;
92                 base.FillColor = Color.White;
93                 base.RectColor = Color.FromArgb(220, 220, 220);
94             }
95 
96             //if (this.Parent != null && BackColor == Color.Transparent)
97         }
98     }
99 }

完整代碼如下

  1 // 版權所有  黃正輝  交流群：568015492   QQ：623128629
  2 // 文件名稱：UCComboBox.cs
  3 // 創建日期：2019-08-15 15:58:51
  4 // 功能描述：ComboBox
  5 // 項目地址：https://gitee.com/kwwwvagaa/net_winform_custom_control
  6 using System;
  7 using System.Collections.Generic;
  8 using System.ComponentModel;
  9 using System.Drawing;
 10 using System.Data;
 11 using System.Linq;
 12 using System.Text;
 13 using System.Windows.Forms;
 14 
 15 namespace HZH_Controls.Controls
 16 {
 17     [DefaultEvent("SelectedChangedEvent")]
 18     public partial class UCComboBox : UCControlBase
 19     {
 20         Color _ForeColor = Color.FromArgb(64, 64, 64);
 21         [Description("文字顏色"), Category("自定義")]
 22         public override Color ForeColor
 23         {
 24             get
 25             {
 26                 return _ForeColor;
 27             }
 28             set
 29             {
 30                 _ForeColor = value;
 31                 lblInput.ForeColor = value;
 32                 txtInput.ForeColor = value;
 33             }
 34         }
 35 
 36         public event EventHandler SelectedChangedEvent;
 37         public event EventHandler TextChangedEvent;
 38 
 39         private ComboBoxStyle _BoxStyle = ComboBoxStyle.DropDown;
 40 
 41         [Description("控制項樣式"), Category("自定義")]
 42         public ComboBoxStyle BoxStyle
 43         {
 44             get { return _BoxStyle; }
 45             set
 46             {
 47                 _BoxStyle = value;
 48                 if (value == ComboBoxStyle.DropDownList)
 49                 {
 50                     lblInput.Visible = true;
 51                     txtInput.Visible = false;
 52                 }
 53                 else
 54                 {
 55                     lblInput.Visible = false;
 56                     txtInput.Visible = true;
 57                 }
 58 
 59                 if (this._BoxStyle == ComboBoxStyle.DropDownList)
 60                 {
 61                     txtInput.BackColor = _BackColor;
 62                     base.FillColor = _BackColor;
 63                     base.RectColor = _BackColor;
 64                 }
 65                 else
 66                 {
 67                     txtInput.BackColor = Color.White;
 68                     base.FillColor = Color.White;
 69                     base.RectColor = Color.FromArgb(220, 220, 220);
 70                 }
 71             }
 72         }
 73 
 74         private Font _Font = new Font("微軟雅黑", 12);
 75         [Description("字體"), Category("自定

（三十五）c#Winform自定義控制項-下拉框

前提

目錄

準備工作

開始