正版软件交易论坛

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);
    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);
  }
}
}