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 程式師世界 >> 編程語言 >> .NET網頁編程 >> C# >> C#基礎知識 >> C#中為DataGrid添加下拉列表框

C#中為DataGrid添加下拉列表框

編輯:C#基礎知識

  本文將介紹如何在 System.Windows.Forms.DataGrid中切入使用ComboBox控件,主要包括三方面的內容。

  1. 在DataGrid中加入ComboBox列;

  2. 把在DataGrid中的修改保存到對應的網格;

  3. 設置DataGrid中網格的焦點。

  下面是整個源代碼,一些功能可以看注釋。

  

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 窗體設計器生成的代碼
  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 = "獲取焦點";
   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>
  /// 應用程序的主入口點。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }
  //初始化DataGrid
  private void PopulateGrid()
  {
   //創建一個DataTable對象,包括四列,前三列為String,最後一列為Boolean。
   dtblFunctionalArea = new DataTable ("FunctionArea");
   string[] arrstrFunctionalArea = new string [3]{"Functional Area","Min","Max"};
   DataColumn dtCol = null;
   //創建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);
   }
   //創建Boolean列,用CheckedBox來顯示。
   DataColumn dtcCheck = new DataColumn("IsMandatory");
   dtcCheck.DataType = System.Type.GetType("System.Boolean");
   dtcCheck.DefaultValue = false;
   dtblFunctionalArea.Columns.Add(dtcCheck);
   //把表綁定到DataGrid
   dgdFunctionArea.DataSource = dtblFunctionalArea;
   //為DataGrid加載DataGridTableStyle樣式
   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;
    //設置列的寬度
    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[]{"選項一","選項二","選項三"});
   cmbFunctionArea.Cursor = Cursors.Arrow;
   cmbFunctionArea.DropDownStyle= ComboBoxStyle.DropDownList;
   cmbFunctionArea.Dock = DockStyle.Fill;
   //在選定項發生更改並且提交了該更改後發生
   cmbFunctionArea.SelectionChangeCommitted += new  EventHandler(cmbFunctionArea_SelectionChangeCommitted);
   //把ComboBox添加到DataGridTableStyle的第一列
   dgtb.TextBox.Controls.Add(cmbFunctionArea);
  }
  //設置焦點模擬
  private void GetFocus(int row,int col)
  {
   //先把焦點移動到DataGrid
   this.dgdFunctionArea.Focus();
   //把焦點移動到DataGridCell
   DataGridCell dgc = new DataGridCell(row,col);
   this.dgdFunctionArea.CurrentCell = dgc;
   DataGridTextBoxColumn dgtb = (DataGridTextBoxColumn)dgdFunctionArea.TableStyles[0].GridColumnStyles[col];
   //設置焦點
   dgtb.TextBox.Focus();
  }
  //把Combobox上修改的數據提交到當前的網格
 private void cmbFunctionArea_SelectionChangeCommitted(object sender, EventArgs e)
 {
  this.dgdFunctionArea[this.dgdFunctionArea.CurrentCell] = ((ComboBox)sender).SelectedItem.ToString();
 }
 //設置新的焦點
 private void buttonFocus_Click(object sender, System.EventArgs e)
 {
  //焦點模擬,這裡設置第三行第一列
  GetFocus(2,0);
 }
}
}

  下面是測試界面:

  總結,這裡是通過DataGridTextBoxColumn.TextBox.Controls.Add方法實現在列中添加ComboBox控件;對於數據的保存是使用ComboBox.SelectionChangeCommitted事件來完成;設置焦點是通過DataGridTextBoxColumn.TextBox.Focus方法來實現。另外通過這個方法也可以添加DateTimePicker等類似的控件。

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