前提

入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。

GitHub：https://github.com/kwwwvagaa/NetWinformControl

码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git

如果觉得写的还行，请点个 star 支持一下吧

欢迎前来交流探讨：企鹅群568015492

麻烦博客下方点个【推荐】，谢谢

NuGet

Install-Package HZH_Controls

用处及效果

准备工作

这个控件将继承自（三）c#Winform自定义控件-有图标的按钮，如不了解，请移步查看

开始

添加一个用户控件UCDropDownBtn，继承自UCBtnImg

处理一些属性

 1 Forms.FrmAnchor _frmAnchor;
 2         private int _dropPanelHeight = -1;
 3         public new event EventHandler BtnClick;
 4         [Description("下拉框高度"), Category("自定义")]
 5         public int DropPanelHeight
 6         {
 7             get { return _dropPanelHeight; }
 8             set { _dropPanelHeight = value; }
 9         }
10         private string[] btns ;
11         [Description("按钮"), Category("自定义")]
12         public string[] Btns
13         {
14             get { return btns; }
15             set { btns = value; }
16         }
17         [Obsolete("不再可用的属性")]
18         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
19         public override Image Image
20         {
21             get;
22             set;
23         }
24         [Obsolete("不再可用的属性")]
25         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
26         public override ContentAlignment ImageAlign
27         {
28             get;
29             set;
30         }

点击时候显示下拉框

 1 void UCDropDownBtn_BtnClick(object sender, EventArgs e)
 2         {
 3             if (_frmAnchor == null || _frmAnchor.IsDisposed || _frmAnchor.Visible == false)
 4             {
 5 
 6                 if (Btns != null && Btns.Length > 0)
 7                 {
 8                     int intRow = 0;
 9                     int intCom = 1;
10                     var p = this.PointToScreen(this.Location);
11                     while (true)
12                     {
13                         int intScreenHeight = Screen.PrimaryScreen.Bounds.Height;
14                         if ((p.Y + this.Height + Btns.Length / intCom * 50 < intScreenHeight || p.Y - Btns.Length / intCom * 50 > 0)
15                             && (_dropPanelHeight <= 0 ? true : (Btns.Length / intCom * 50 <= _dropPanelHeight)))
16                         {
17                             intRow = Btns.Length / intCom + (Btns.Length % intCom != 0 ? 1 : 0);
18                             break;
19                         }
20                         intCom++;
21                     }
22                     UCTimePanel ucTime = new UCTimePanel();
23                     ucTime.IsShowBorder = true;
24                     int intWidth = this.Width / intCom;
25 
26                     Size size = new Size(intCom * intWidth, intRow * 50);
27                     ucTime.Size = size;
28                     ucTime.FirstEvent = true;
29                     ucTime.SelectSourceEvent += ucTime_SelectSourceEvent;
30                     ucTime.Row = intRow;
31                     ucTime.Column = intCom;
32 
33                     List<KeyValuePair<string, string>> lst = new List<KeyValuePair<string, string>>();
34                     foreach (var item in Btns)
35                     {
36                         lst.Add(new KeyValuePair<string, string>(item, item));
37                     }
38                     ucTime.Source = lst;
39 
40                     _frmAnchor = new Forms.FrmAnchor(this, ucTime);
41                     _frmAnchor.Load += (a, b) => { (a as Form).Size = size; };
42 
43                     _frmAnchor.Show(this.FindForm());
44 
45                 }
46             }
47             else
48             {
49                 _frmAnchor.Close();
50             }
51         }

处理一下按钮事件

 1 void ucTime_SelectSourceEvent(object sender, EventArgs e)
 2         {
 3             if (_frmAnchor != null && !_frmAnchor.IsDisposed && _frmAnchor.Visible)
 4             {
 5                 _frmAnchor.Close();
 6 
 7                 if (BtnClick != null)
 8                 {
 9                     BtnClick(sender.ToString(), e);
10                 }
11             }
12         }

完整代码

  1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Drawing;
  5 using System.Data;
  6 using System.Linq;
  7 using System.Text;
  8 using System.Windows.Forms;
  9 
 10 namespace HZH_Controls.Controls.Btn
 11 {
 12     [DefaultEvent("BtnClick")]
 13     public partial class UCDropDownBtn : UCBtnImg
 14     {
 15         Forms.FrmAnchor _frmAnchor;
 16         private int _dropPanelHeight = -1;
 17         public new event EventHandler BtnClick;
 18         [Description("下拉框高度"), Category("自定义")]
 19         public int DropPanelHeight
 20         {
 21             get { return _dropPanelHeight; }
 22             set { _dropPanelHeight = value; }
 23         }
 24         private string[] btns ;
 25         [Description("按钮"), Category("自定义")]
 26         public string[] Btns
 27         {
 28             get { return btns; }
 29             set { btns = value; }
 30         }
 31         [Obsolete("不再可用的属性")]
 32         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
 33         public override Image Image
 34         {
 35             get;
 36             set;
 37         }
 38         [Obsolete("不再可用的属性")]
 39         [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
 40         public override ContentAlignment ImageAlign
 41         {
 42             get;
 43             set;
 44         }
 45 
 46         public UCDropDownBtn()
 47         {
 48             InitializeComponent();
 49             IsShowTips = false;
 50             this.lbl.Image=Properties.Resources.ComboBox;
 51             this.lbl.ImageAlign = ContentAlignment.MiddleRight;
 52             base.BtnClick += UCDropDownBtn_BtnClick;
 53         }
 54 
 55         void UCDropDownBtn_BtnClick(object sender, EventArgs e)
 56         {
 57             if (_frmAnchor == null || _frmAnchor.IsDisposed || _frmAnchor.Visible == false)
 58             {
 59 
 60                 if (Btns != null && Btns.Length > 0)
 61                 {
 62                     int intRow = 0;
 63                     int intCom = 1;
 64                     var p = this.PointToScreen(this.Location);
 65                     while (true)
 66                     {
 67                         int intScreenHeight = Screen.PrimaryScreen.Bounds.Height;
 68                         if ((p.Y + this.Height + Btns.Length / intCom * 50 < intScreenHeight || p.Y - Btns.Length / intCom * 50 > 0)
 69                             && (_dropPanelHeight <= 0 ? true : (Btns.Length / intCom * 50 <= _dropPanelHeight)))
 70                         {
 71                             intRow = Btns.Length / intCom + (Btns.Length % intCom != 0 ? 1 : 0);
 72                             break;
 73                         }
 74                         intCom++;
 75                     }
 76                     UCTimePanel ucTime = new UCTimePanel();
 77                     ucTime.IsShowBorder = true;
 78                     int intWidth = this.Width / intCom;
 79 
 80                     Size size = new Size(intCom * intWidth, intRow * 50);
 81                     ucTime.Size = size;
 82                     ucTime.FirstEvent = true;
 83                     ucTime.SelectSourceEvent += ucTime_SelectSourceEvent;
 84                     ucTime.Row = intRow;
 85                     ucTime.Column = intCom;
 86 
 87                     List<KeyValuePair<string, string>> lst = new List<KeyValuePair<string, string>>();
 88                     foreach (var item in Btns)
 89                     {
 90                         lst.Add(new KeyValuePair<string, string>(item, item));
 91                     }
 92                     ucTime.Source = lst;
 93 
 94                     _frmAnchor = new Forms.FrmAnchor(this, ucTime);
 95                     _frmAnchor.Load += (a, b) => { (a as Form).Size = size; };
 96 
 97                     _frmAnchor.Show(this.FindForm());
 98 
 99                 }
100             }
101             else
102             {
103                 _frmAnchor.Close();
104             }
105         }
106         void ucTime_SelectSourceEvent(object sender, EventArgs e)
107         {
108             if (_frmAnchor != null && !_frmAnchor.IsDisposed && _frmAnchor.Visible)
109             {
110                 _frmAnchor.Close();
111 
112                 if (BtnClick != null)
113                 {
114                     BtnClick(sender.ToString(), e);
115                 }
116             }
117         }
118     }
119 }

View Code

 1 namespace HZH_Controls.Controls.Btn
 2 {
 3     partial class UCDropDownBtn
 4     {
 5         /// <summary> 
 6         /// 必需的设计器变量。
 7         /// </summary>
 8         private System.ComponentModel.IContainer components = null;
 9 
10         /// <summary> 
11         /// 清理所有正在使用的资源。
12         /// </summary>
13         /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
14         protected override void Dispose(bool disposing)
15         {
16             if (disposing && (components != null))
17             {
18                 components.Dispose();
19             }
20             base.Dispose(disposing);
21         }
22 
23         #region 组件设计器生成的代码
24 
25         /// <summary> 
26         /// 设计器支持所需的方法 - 不要
27         /// 使用代码编辑器修改此方法的内容。
28         /// </summary>
29         private void InitializeComponent()
30         {
31             System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(UCDropDownBtn));
32             this.SuspendLayout();
33             // 
34             // lbl
35             // 
36             this.lbl.Font = new System.Drawing.Font("微软雅黑", 14F);
37             this.lbl.ForeColor = System.Drawing.Color.White;
38             this.lbl.ImageAlign = System.Drawing.ContentAlignment.MiddleRight;
39             this.lbl.ImageList = null;
40             this.lbl.Text = "自定义按钮";
41             this.lbl.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
42             // 
43             // UCDropDownBtn
44             // 
45             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
46             this.BtnFont = new System.Drawing.Font("微软雅黑", 14F);
47             this.BtnForeColor = System.Drawing.Color.White;
48             this.ForeColor = System.Drawing.Color.White;
49             this.Image = ((System.Drawing.Image)(resources.GetObject("$this.Image")));
50             this.ImageAlign = System.Drawing.ContentAlignment.MiddleRight;
51             this.Margin = new System.Windows.Forms.Padding(2);
52             this.Name = "UCDropDownBtn";
53             this.ResumeLayout(false);
54 
55         }
56 
57         #endregion
58     }
59 }

View Code

最后的话

如果你喜欢的话，请到 https://gitee.com/kwwwvagaa/net_winform_custom_control 点个星星吧

秒客网

（四十八）c#Winform自定义控件-下拉按钮

前提

NuGet

目录

用处及效果

准备工作

开始

最后的话

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