C#中为DataGrid添加下拉列表框

C#中为DataGrid添加下拉列表框
本文将介绍如何在 System.Windows.Forms.DataGrid中切入使用ComboBox控件，主要包括三方面的内容。

　　1． 在DataGrid中加入ComboBox列；

　　2． 把在DataGrid中的修改保存到对应的网格；
　
　　3． 设置DataGrid中网格的焦点。

　　下面是整个源代码，一些功能可以看注释。

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace DataGridTest
{
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.DataGrid dgdFunctionArea;
  private DataTable dtblFunctionalArea;
  private System.Windows.Forms.Button buttonFocus;
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   InitializeComponent();
   PopulateGrid();
  }

  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码

  private void InitializeComponent()
  {
   this.dgdFunctionArea = new System.Windows.Forms.DataGrid();
   this.buttonFocus = new System.Windows.Forms.Button();
   ((System.ComponentModel.ISupportInitialize)(this.dgdFunctionArea)).BeginInit();
   this.SuspendLayout();
   //
   // dgdFunctionArea
   //
   this.dgdFunctionArea.DataMember = "";
   this.dgdFunctionArea.HeaderForeColor = System.Drawing.SystemColors.ControlText;

   this.dgdFunctionArea.Location = new System.Drawing.Point(4, 8);
   this.dgdFunctionArea.Name = "dgdFunctionArea";
   this.dgdFunctionArea.Size = new System.Drawing.Size(316, 168);
   this.dgdFunctionArea.TabIndex = 0;
   //
   // buttonFocus
   //
   this.buttonFocus.Location = new System.Drawing.Point(232, 188);
   this.buttonFocus.Name = "buttonFocus";
   this.buttonFocus.Size = new System.Drawing.Size(84, 23);
   this.buttonFocus.TabIndex = 1;
   this.buttonFocus.Text = "获取焦点";
   this.buttonFocus.Click += new System.EventHandler(this.buttonFocus_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(332, 217);
   this.Controls.Add(this.buttonFocus);
   this.Controls.Add(this.dgdFunctionArea);
   this.Name = "Form1";
   this.Text = "Form1";
   ((System.ComponentModel.ISupportInitialize)(this.dgdFunctionArea)).EndInit();
   this.ResumeLayout(false);

  }
  #endregion
  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }
  //初始化DataGrid
  private void PopulateGrid()
  {
   //创建一个DataTable对象，包括四列，前三列为String，最后一列为Boolean。
   dtblFunctionalArea = new DataTable ("FunctionArea");
   string[] arrstrFunctionalArea = new string [3]{"Functional Area","Min","Max"};
   DataColumn dtCol = null;
   //创建String列
   for(int i=0; i< 3;i++)
   {
    dtCol = new DataColumn(arrstrFunctionalArea[i]);
    dtCol.DataType = Type.GetType("System.String");
    dtCol.DefaultValue = "";
    dtblFunctionalArea.Columns.Add(dtCol);
   }

   //创建Boolean列，用CheckedBox来显示。
   DataColumn dtcCheck = new DataColumn("IsMandatory");
   dtcCheck.DataType = System.Type.GetType("System.Boolean");
   dtcCheck.DefaultValue = false;
   dtblFunctionalArea.Columns.Add(dtcCheck);

   //把表绑定到DataGrid
   dgdFunctionArea.DataSource = dtblFunctionalArea;

   //为DataGrid加载DataGridTableStyle样式
   if(!dgdFunctionArea.TableStyles.Contains("FunctionArea"))
   {
    DataGridTableStyle dgdtblStyle = new DataGridTableStyle();
    dgdtblStyle.MappingName = dtblFunctionalArea.TableName;
    dgdFunctionArea.TableStyles.Add(dgdtblStyle);
    dgdtblStyle.RowHeadersVisible = false;
    dgdtblStyle.HeaderBackColor = Color.LightSteelBlue;
    dgdtblStyle.AllowSorting = false;
    dgdtblStyle.HeaderBackColor = Color.FromArgb(8,36,107);
    dgdtblStyle.RowHeadersVisible = false;
    dgdtblStyle.HeaderForeColor = Color.White;
    dgdtblStyle.HeaderFont = new System.Drawing.Font("Microsoft Sans Serif", 9F,
     System.Drawing.FontStyle.Bold,
     System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
    dgdtblStyle.GridLineColor = Color.DarkGray;
    dgdtblStyle.PreferredRowHeight = 22;
    dgdFunctionArea.BackgroundColor = Color.White;

    //设置列的宽度
    GridColumnStylesCollection colStyle = dgdFunctionArea.TableStyles[0].GridColumnStyles;
    colStyle[0].Width = 100;
    colStyle[1].Width = 50;
    colStyle[2].Width = 50;
    colStyle[3].Width = 80;
   }

   DataGridTextBoxColumn dgtb = (DataGridTextBoxColumn)dgdFunctionArea.TableStyles[0].GridColumnStyles[0];

   ComboBox cmbFunctionArea = new ComboBox();
   cmbFunctionArea.Items.AddRange(new object[]{"选项一","选项二","选项三"});
   cmbFunctionArea.Cursor = Cursors.Arrow;
   cmbFunctionArea.DropDownStyle= ComboBoxStyle.DropDownList;
   cmbFunctionArea.Dock = DockStyle.Fill;

   //在选定项发生更改并且提交了该更改后发生

   cmbFunctionArea.SelectionChangeCommitted += new  EventHandler(cmbFunctionArea_SelectionChangeCommitted);

   //把ComboBox添加到DataGridTableStyle的第一列

   dgtb.TextBox.Controls.Add(cmbFunctionArea);

  }

  //设置焦点模拟

  private void GetFocus(int row,int col)
  {
   //先把焦点移动到DataGrid
   this.dgdFunctionArea.Focus();
   //把焦点移动到DataGridCell
   DataGridCell dgc = new DataGridCell(row,col);
   this.dgdFunctionArea.CurrentCell = dgc;
   DataGridTextBoxColumn dgtb = (DataGridTextBoxColumn)dgdFunctionArea.TableStyles[0].GridColumnStyles[col];

   //设置焦点

   dgtb.TextBox.Focus();
  }

  //把Combobox上修改的数据提交到当前的网格

  private void cmbFunctionArea_SelectionChangeCommitted(object sender, EventArgs e)
  {
   this.dgdFunctionArea[this.dgdFunctionArea.CurrentCell] = ((ComboBox)sender).SelectedItem.ToString();

  }

  //设置新的焦点

  private void buttonFocus_Click(object sender, System.EventArgs e)
  {
   //焦点模拟,这里设置第三行第一列
   GetFocus(2,0);
  }
 }

}