在DataGridView控件中加入ComboBox下拉列表框的实现.docx

在DataGridView控件中加入ComboBox下拉列表框的实现在DataGridView控件中加入ComboBox下拉列表框的实现 虽然在Visual Studio中 DataGridView控件的DataGridViewComboBoxColumn可以实现下拉列表框，但这样的列会在整列中都显示下拉列表框，不太 美观，而且还要用代码实现数据绑定。本文介绍一种只在当前编辑单元格中显示下拉列表框的方法，供大家参考。 首先新建一个Windows应用程序，将主窗体重命名为MainForm，在MainForm中加入一个DataGridView控件，命名为dgv_User。如下图所示： 打开窗体代码窗口，在代码窗口中声明一个ComboBox的控件 / 定义下拉列表框 private ComboBox cmb_Temp = new ComboBox; 我们要绑定的下拉列表框的功能是选择性别，添加如下绑定性别下拉列表框的方法 / <summary> / 绑定性别下拉列表框 / </summary> private void BindSex DataTable dtSex = new DataTable; dtSex.Columns.Add("Value"); dtSex.Columns.Add("Name"); DataRow drSex; drSex = dtSex.NewRow; drSex0 = "1" drSex1 = "男" dtSex.Rows.Add(drSex); drSex = dtSex.NewRow; drSex0 = "0" drSex1 = "女" dtSex.Rows.Add(drSex); cmb_Temp.ValueMember = "Value" cmb_Temp.DisplayMember = "Name" cmb_Temp.DataSource = dtSex; cmb_Temp.DropDownStyle = ComboBoxStyle.DropDownList; 通常情况下我们都是从数据库中获取数据表，然后绑定到DataGridView中的，这里我们为了避免连接数据库，手中构造一个数据库表，代码如下： private void BindData DataTable dtData = new DataTable; dtData.Columns.Add("ID"); dtData.Columns.Add("Name"); dtData.Columns.Add("Sex"); DataRow drData; drData = dtData.NewRow; drData0 = 1; drData1 = "张三" drData2 = "1" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 2; drData1 = "李四" drData2 = "1" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 3; drData1 = "王五" drData2 = "1" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 4; drData1 = "小芳" drData2 = "0" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 5; drData1 = "小娟" drData2 = "0" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 6; drData1 = "赵六" drData2 = "1" dtData.Rows.Add(drData); this.dgv_User.DataSource = dtData; 为窗体加载事件添加如下方法，其具体功能有详细说明： private void MainForm_Load(object sender, EventArgs e) / 绑定性别下拉列表框 BindSex; /绑定数据表 BindData; / 设置下拉列表框不可见 cmb_Temp.Visible = false; / 添加下拉列表框事件 cmb_Temp.SelectedIndexChanged += new EventHandler(cmb_Temp_SelectedIndexChanged); / 将下拉列表框加入到DataGridView控件中 this.dgv_User.Controls.Add(cmb_Temp); 当用户选择的单元格移动到性别这一列时，我们要显示下拉列表框，添加如下事件 private void dgv_User_CurrentCellChanged(object sender, EventArgs e) try if (this.dgv_User.CurrentCell.ColumnIndex = 2) Rectangle rect = dgv_User.GetCellDisplayRectangle(dgv_User.CurrentCell.ColumnIndex, dgv_User.CurrentCell.RowIndex, false); string sexValue = dgv_User.CurrentCell.Value.ToString; if (sexValue = "1") cmb_Temp.Text = "男" else cmb_Temp.Text = "女" cmb_Temp.Left = rect.Left; cmb_Temp.Top = rect.Top; cmb_Temp.Width = rect.Width; cmb_Temp.Height = rect.Height; cmb_Temp.Visible = true; else cmb_Temp.Visible = false; catch 当用户选择下拉列表框时改变DataGridView单元格的内容 private void cmb_Temp_SelectedIndexChanged(object sender, EventArgs e) if (ComboBox)sender).Text = "男") dgv_User.CurrentCell.Value = "男" dgv_User.CurrentCell.Tag = "1" else dgv_User.CurrentCell.Value = "女" dgv_User.CurrentCell.Tag = "0" 当滚动DataGridView或者改变DataGridView列宽时将下拉列表框设为不可见 private void dgv_User_Scroll(object sender, ScrollEventArgs e) this.cmb_Temp.Visible = false; private void dgv_User_ColumnWidthChanged(object sender, DataGridViewColumnEventArgs e) this.cmb_Temp.Visible = false; 绑定数据表后将性别列中的每一单元格的Value和Tag属性 private void dgv_User_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e) for (int i = 0; i < this.dgv_User.Rows.Count; i+) if (dgv_User.Rowsi.Cells2.Value != null && dgv_User.Rowsi.Cells2.ColumnIndex = 2) dgv_User.Rowsi.Cells2.Tag = dgv_User.Rowsi.Cells2.Value.ToString; if (dgv_User.Rowsi.Cells2.Value.ToString = "1") dgv_User.Rowsi.Cells2.Value = "男" else if (dgv_User.Rowsi.Cells2.Value.ToString = "0") dgv_User.Rowsi.Cells2.Value = "女" 效果如下图所示： 完整的代码如下： using System; using System.Data; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Text; using System.Windows.Forms; namespace MyNameSpace public partial class MainForm : Form / 定义下拉列表框 private ComboBox cmb_Temp = new ComboBox; public MainForm InitializeComponent; / <summary> / 绑定性别下拉列表框 / </summary> private void BindSex DataTable dtSex = new DataTable; dtSex.Columns.Add("Value"); dtSex.Columns.Add("Name"); DataRow drSex; drSex = dtSex.NewRow; drSex0 = "1" drSex1 = "男" dtSex.Rows.Add(drSex); drSex = dtSex.NewRow; drSex0 = "0" drSex1 = "女" dtSex.Rows.Add(drSex); cmb_Temp.ValueMember = "Value" cmb_Temp.DisplayMember = "Name" cmb_Temp.DataSource = dtSex; cmb_Temp.DropDownStyle = ComboBoxStyle.DropDownList; / <summary> / 为避免连接数据库，这里手工构造数据表，实际应用中应从数据库中获取 / </summary> private void BindData DataTable dtData = new DataTable; dtData.Columns.Add("ID"); dtData.Columns.Add("Name"); dtData.Columns.Add("Sex"); DataRow drData; drData = dtData.NewRow; drData0 = 1; drData1 = "张三" drData2 = "1" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 2; drData1 = "李四" drData2 = "1" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 3; drData1 = "王五" drData2 = "1" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 4; drData1 = "小芳" drData2 = "0" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 5; drData1 = "小娟" drData2 = "0" dtData.Rows.Add(drData); drData = dtData.NewRow; drData0 = 6; drData1 = "赵六" drData2 = "1" dtData.Rows.Add(drData); this.dgv_User.DataSource = dtData; private void MainForm_Load(object sender, EventArgs e) / 绑定性别下拉列表框 BindSex; /绑定数据表 BindData; / 设置下拉列表框不可见 cmb_Temp.Visible = false; / 添加下拉列表框事件 cmb_Temp.SelectedIndexChanged += new EventHandler(cmb_Temp_SelectedIndexChanged); / 将下拉列表框加入到DataGridView控件中 this.dgv_User.Controls.Add(cmb_Temp); / 当用户移动到性别这一列时单元格显示下拉列表框 private void dgv_User_CurrentCellChanged(object sender, EventArgs e) try if (this.dgv_User.CurrentCell.ColumnIndex = 2) Rectangle rect = dgv_User.GetCellDisplayRectangle(dgv_User.CurrentCell.ColumnIndex, dgv_User.CurrentCell.RowIndex, false); string sexValue = dgv_User.CurrentCell.Value.ToString; if (sexValue = "1") cmb_Temp.Text = "男" else cmb_Temp.Text = "女" cmb_Temp.Left = rect.Left; cmb_Temp.Top = rect.Top; cmb_Temp.Width = rect.Width; cmb_Temp.Height = rect.Height; cmb_Temp.Visible = true; else cmb_Temp.Visible = false; catch / 当用户选择下拉列表框时改变DataGridView单元格的内容 private void cmb_Temp_SelectedIndexChanged(object sender, EventArgs e) if (ComboBox)sender).Text = "男") dgv_User.CurrentCell.Value = "男" dgv_User.CurrentCell.Tag = "1" else dgv_User.CurrentCell.Value = "女" dgv_User.CurrentCell.Tag = "0" / 滚动DataGridView时将下拉列表框设为不可见 private void dgv_User_Scroll(object sender, ScrollEventArgs e) this.cmb_Temp.Visible = false; / 改变DataGridView列宽时将下拉列表框设为不可见 private void dgv_User_ColumnWidthChanged(object sender, DataGridViewColumnEventArgs e) this.cmb_Temp.Visible = false; / 绑定数据表后将性别列中的每一单元格的Value和Tag属性 private void dgv_User_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e) for (int i = 0; i < this.dgv_User.Rows.Count; i+) if (dgv_User.Rowsi.Cells2.Value != null && dgv_User.Rowsi.Cells2.ColumnIndex = 2) dgv_User.Rowsi.Cells2.Tag = dgv_User.Rowsi.Cells2.Value.ToString; if (dgv_User.Rowsi.Cells2.Value.ToString = "1") dgv_User.Rowsi.Cells2.Value = "男" else if (dgv_User.Rowsi.Cells2.Value.ToString = "0") dgv_User.Rowsi.Cells2.Value = "女"