在实际工作中，如果能像菜单一样弹出自定义内容，会方便很多，比如查询时，比如下拉列表显示多列信息时，比如在填写某个信息需要查看一些信息树时。这个时候自定义弹出界面就显的非常重要了
我这里其实用到的是网上找到的一个控件（），控件可以把你装载的任何对象显示出来（这里的对象是指：窗体，自定义控件等），这里文章写出来并不是为了炫耀什么，只是觉得发现些好东西就分享出来而已，同时也做个记录，方便以后查找
开始正文，这里我做一个多列下拉列表来说明：
1、新建winform项目：PopupApplication
2、添加引用，引用上面下载的dll文件
3、因为要显示数据，所以这里需要构造一个数据源，因此我建了一个对象Student，属性：SId,SCode,SName,SAge,SAddress
namespace PopupApplication{ public class Student { public int SId { get; set; } public string SCode { get; set; } public string SName { get; set; } public int SAge { get; set; } public string SAddress{ get;set;} }} 4、创建用户控件：StudentListControl
5、在用户控件中添加一个DataGridView命名：dgvStudentList 和TextBox命名：txtKeys，DataGridView是用来显示数据列表的，TextBox是用来让用户输入关键字用来检索信息用的
如图：
6、构建数据源并绑定数据，代码：
private List_dataList = new List (); private TextBox _txtBox; public StudentListControl(TextBox txtBox) { InitializeComponent(); _txtBox = txtBox; _dataList = GetDataList(); } private void StudentListControl_Load(object sender, EventArgs e) { dgvStudentList.DataSource = _dataList; } /// /// 构造数据源 /// ///private List GetDataList() { List stList = new List (); stList.Add(new Student() { SId = 1, SName = "张阳", SAge = 15, SCode = "zy", SAddress = "广东省中山市9999999" }); stList.Add(new Student() { SId = 2, SName = "欧阳新文", SAge = 17, SCode = "oyxw", SAddress = "广东省广州市99" }); stList.Add(new Student() { SId = 3, SName = "宇文化及", SAge = 18, SCode = "ywhj", SAddress = "广东省湛江市2222" }); stList.Add(new Student() { SId = 4, SName = "温斯特梅拉", SAge = 19, SCode = "wstml", SAddress = "广东省茂名市" }); stList.Add(new Student() { SId = 6, SName = "唐兵", SAge = 24, SCode = "tb", SAddress = "四川省阆中市555555555555" }); stList.Add(new Student() { SId = 8, SName = "杨红军", SAge = 24, SCode = "yhj", SAddress = "四川省乐山市22222222222222222222" }); stList.Add(new Student() { SId = 11, SName = "张翠山", SAge = 23, SCode = "zcs", SAddress = "四川省南充市7777777777777777" }); stList.Add(new Student() { SId = 12, SName = "张三丰", SAge = 27, SCode = "zsf", SAddress = "广东省中山市555" }); stList.Add(new Student() { SId = 13, SName = "何月", SAge = 28, SCode = "hy", SAddress = "广东省中山市88888" }); stList.Add(new Student() { SId = 14, SName = "何宝生", SAge = 32, SCode = "hbs", SAddress = "广东省中山市77" }); stList.Add(new Student() { SId = 15, SName = "王家新", SAge = 33, SCode = "wjx", SAddress = "广东省茂名市8" }); stList.Add(new Student() { SId = 23, SName = "肖月伦", SAge = 34, SCode = "xyl", SAddress = "广东省茂名市7777777" }); stList.Add(new Student() { SId = 22, SName = "王岳伦", SAge = 25, SCode = "wyl", SAddress = "广东省中山市888888888888" }); stList.Add(new Student() { SId = 24, SName = "紫阳红玉", SAge = 45, SCode = "zyhy", SAddress = "四川省南充市2" }); stList.Add(new Student() { SId = 27, SName = "雷小兵", SAge = 30, SCode = "lxb", SAddress = "广东省中山市999999999999999" }); stList.Add(new Student() { SId = 28, SName = "张郭老", SAge = 18, SCode = "zgl", SAddress = "四川省南充市333333333333333333333333" }); stList.Add(new Student() { SId = 30, SName = "汤小雨", SAge = 24, SCode = "txy", SAddress = "四川省乐山市333333333333" }); stList.Add(new Student() { SId = 31, SName = "吴志胜", SAge = 26, SCode = "wzs", SAddress = "四川省乐山市33" }); stList.Add(new Student() { SId = 32, SName = "伍国天", SAge = 32, SCode = "wgt", SAddress = "四川省阆中市6666" }); stList.Add(new Student() { SId = 33, SName = "朱新朝", SAge = 33, SCode = "zxz", SAddress = "四川省阆中市666666666666666" }); return stList; }
7、给txtKeys控件添加TextChange事件：
private void txtKeys_TextChanged(object sender, EventArgs e) { if(string.IsNullOrEmpty(txtKeys.Text)) { return; } var resultList = _dataList.FindAll(std=>std.SName.Contains(txtKeys.Text) || std.SAddress.Contains(txtKeys.Text)); dgvStudentList.DataSource = resultList; } 8、给dgvStudentList添加点击事件，当点击列表的时候需要把选中的值显示到需要显示选中值的TextBox中
private void dgvStudentList_Click(object sender, EventArgs e) { if (dgvStudentList.RowCount > 0 && dgvStudentList.SelectedRows.Count > 0) { DataGridViewCell nameCell= dgvStudentList.CurrentRow.Cells["ColumnSName"]; DataGridViewCell addressCell = dgvStudentList.CurrentRow.Cells["ColumnSAddress"]; string strName = nameCell != null && nameCell.Value != null ? nameCell.Value.ToString() : ""; string strAddress = addressCell != null && addressCell.Value != null ? addressCell.Value.ToString() : ""; _txtBox.Text = string.Format("{0},{1}",strName,strAddress); } } 9、在Form1界面添加TextBox控件命名：txtSelectValue,添加如下代码：
public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void txtSelectValue_Click(object sender, EventArgs e) { StudentListControl uc = new StudentListControl(txtSelectValue); Popup pop = new Popup(uc); pop.Show(txtSelectValue, false); } }
至此 功能实现了，全部代码：
View Code using System;using System.Windows.Forms;using PopupTool;namespace PopupApplication{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void txtSelectValue_Click(object sender, EventArgs e) { StudentListControl uc = new StudentListControl(txtSelectValue); Popup pop = new Popup(uc); pop.Show(txtSelectValue, false); } }}using System;using System.Collections.Generic;using System.Windows.Forms;namespace PopupApplication{ public partial class StudentListControl : UserControl { private List _dataList = new List (); private TextBox _txtBox; public StudentListControl(TextBox txtBox) { InitializeComponent(); _txtBox = txtBox; _dataList = GetDataList(); } private void StudentListControl_Load(object sender, EventArgs e) { dgvStudentList.DataSource = _dataList; } /// /// 构造数据源 /// /// GetDataList() { List stList = new List (); stList.Add(new Student() { SId = 1, SName = "张阳", SAge = 15, SCode = "zy", SAddress = "广东省中山市9999999" }); stList.Add(new Student() { SId = 2, SName = "欧阳新文", SAge = 17, SCode = "oyxw", SAddress = "广东省广州市99" }); stList.Add(new Student() { SId = 3, SName = "宇文化及", SAge = 18, SCode = "ywhj", SAddress = "广东省湛江市2222" }); stList.Add(new Student() { SId = 4, SName = "温斯特梅拉", SAge = 19, SCode = "wstml", SAddress = "广东省茂名市" }); stList.Add(new Student() { SId = 6, SName = "唐兵", SAge = 24, SCode = "tb", SAddress = "四川省阆中市555555555555" }); stList.Add(new Student() { SId = 8, SName = "杨红军", SAge = 24, SCode = "yhj", SAddress = "四川省乐山市22222222222222222222" }); stList.Add(new Student() { SId = 11, SName = "张翠山", SAge = 23, SCode = "zcs", SAddress = "四川省南充市7777777777777777" }); stList.Add(new Student() { SId = 12, SName = "张三丰", SAge = 27, SCode = "zsf", SAddress = "广东省中山市555" }); stList.Add(new Student() { SId = 13, SName = "何月", SAge = 28, SCode = "hy", SAddress = "广东省中山市88888" }); stList.Add(new Student() { SId = 14, SName = "何宝生", SAge = 32, SCode = "hbs", SAddress = "广东省中山市77" }); stList.Add(new Student() { SId = 15, SName = "王家新", SAge = 33, SCode = "wjx", SAddress = "广东省茂名市8" }); stList.Add(new Student() { SId = 23, SName = "肖月伦", SAge = 34, SCode = "xyl", SAddress = "广东省茂名市7777777" }); stList.Add(new Student() { SId = 22, SName = "王岳伦", SAge = 25, SCode = "wyl", SAddress = "广东省中山市888888888888" }); stList.Add(new Student() { SId = 24, SName = "紫阳红玉", SAge = 45, SCode = "zyhy", SAddress = "四川省南充市2" }); stList.Add(new Student() { SId = 27, SName = "雷小兵", SAge = 30, SCode = "lxb", SAddress = "广东省中山市999999999999999" }); stList.Add(new Student() { SId = 28, SName = "张郭老", SAge = 18, SCode = "zgl", SAddress = "四川省南充市333333333333333333333333" }); stList.Add(new Student() { SId = 30, SName = "汤小雨", SAge = 24, SCode = "txy", SAddress = "四川省乐山市333333333333" }); stList.Add(new Student() { SId = 31, SName = "吴志胜", SAge = 26, SCode = "wzs", SAddress = "四川省乐山市33" }); stList.Add(new Student() { SId = 32, SName = "伍国天", SAge = 32, SCode = "wgt", SAddress = "四川省阆中市6666" }); stList.Add(new Student() { SId = 33, SName = "朱新朝", SAge = 33, SCode = "zxz", SAddress = "四川省阆中市666666666666666" }); return stList; } private void txtKeys_TextChanged(object sender, EventArgs e) { if(string.IsNullOrEmpty(txtKeys.Text)) { return; } var resultList = _dataList.FindAll(std=>std.SName.Contains(txtKeys.Text) || std.SAddress.Contains(txtKeys.Text)); dgvStudentList.DataSource = resultList; } private void dgvStudentList_Click(object sender, EventArgs e) { if (dgvStudentList.RowCount > 0 && dgvStudentList.SelectedRows.Count > 0) { DataGridViewCell nameCell= dgvStudentList.CurrentRow.Cells["ColumnSName"]; DataGridViewCell addressCell = dgvStudentList.CurrentRow.Cells["ColumnSAddress"]; string strName = nameCell != null && nameCell.Value != null ? nameCell.Value.ToString() : ""; string strAddress = addressCell != null && addressCell.Value != null ? addressCell.Value.ToString() : ""; _txtBox.Text = string.Format("{0},{1}",strName,strAddress); this.Dispose(); } } }} 
在弹出控件中输入关键字：温
选中一条记录后 弹出界面消失，并把选中的值显示在TextBox中
你可以自己解决在弹出层中显示什么，
比如只显示两列，
还可以设置弹出界面自动适应随内容的宽度，这样内容不会被截取显示，也就是说没有横向滚动条出现
以此，我另外做了个下拉列表 大家有兴趣的可以下来看看