Winform DataGrid设计三步曲之三 如何改变DataGrid的背景色 在用DataGrid作为表格显示数据的时候，有时往往需要根据数据的内容来显示不同的颜色，比如作告警列表时，不同的告警要用不同的颜色表示。修改DataGrid背景色的方法很多，这里介绍一种使用DataGrid的TableStyle属性方法来修改背景色。大致过程如下： 1. 自定义DataGridColoredTextBoxColumn类，继承自DataGridTextBoxColumn 2. 重写(override) Paint方法 3. 用DataGridColoredTextBoxColumn类替代程序中的DataGridTextBoxColumn类 代码如下：代码说明详见代码中的注释，该程序在vs2003下测试通过。程序中用到了TableStyle，如果对于TableStyle不太清楚，请参看我的第一篇文章 http://blog.csdn.net/tjvictor/archive/2007/01/20/1488549.aspx 程序中所有关于TableStyle的部分都没有加注释。程序的重点在于DataGridColoredTextBoxColumn 类的构造和Paint方法的重写。 代码如下： using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace DataGridBackColor { ///<summary> /// BackColorForm 的摘要描述。 ///</summary> public class BackColorForm : System.Windows.Forms.Form { //定义DataGridColoredTextBoxColumn类 public class DataGridColoredTextBoxColumn : DataGridTextBoxColumn { //利用DataView来传递当前DataGrid中的数据 public DataView dv = null; //重写Paint protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, Brush backBrush, Brush foreBrush, bool alignToRight) { try { //判断DataGrid中每行第一列的数据是否为如下的字符串 switch( dv[rowNum].Row[0].ToString() ) { case "critical" : backBrush = Brushes.Red; break;//改变颜色 case "major" : backBrush = Brushes.Brown; break;//改变颜色 case "minor" : backBrush = Brushes.Orange; break;//改变颜色 case "warning" : backBrush = Brushes.YellowGreen; break;//改变颜色 default : break; } } catch( Exception ex ) { MessageBox.Show( ex.Message ); } finally { //调用基类的Paint方法 base.Paint (g, bounds, source, rowNum, backBrush, foreBrush, alignToRight); } } } private System.Windows.Forms.DataGrid dataGrid; private System.Windows.Forms.DataGridTableStyle TableStyle; private DataGridColoredTextBoxColumn Status; private DataGridColoredTextBoxColumn TextBox1; private DataGridColoredTextBoxColumn TextBox2; ///<summary> ///设计工具所需的变数。 ///</summary> private System.ComponentModel.Container components = null; public BackColorForm() { // // Windows Form 设计工具支持的必要项 // InitializeComponent(); // // TODO: 在 InitializeComponent 呼叫之后加入任何建构函式程序代码 // } ///<summary> ///清除任何使用中的资源。 ///</summary> protected override void Dispose( bool disposing ) { if( disposing ) { if(components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form 设计工具产生的程序代码 ///<summary> ///此为设计工具支持所必须的方法 - 请勿使用程序代码编辑器修改 ///这个方法的内容。 ///</summary> private void InitializeComponent() { this.dataGrid = new System.Windows.Forms.DataGrid(); this.TableStyle = new System.Windows.Forms.DataGridTableStyle(); this.Status = new DataGridColoredTextBoxColumn(); this.TextBox1 = new DataGridColoredTextBoxColumn(); this.TextBox2 = new DataGridColoredTextBoxColumn(); ((System.ComponentModel.ISupportInitialize)(this.dataGrid)).BeginInit(); this.SuspendLayout(); // // dataGrid // this.dataGrid.CaptionText = "BackColorForm"; this.dataGrid.DataMember = ""; this.dataGrid.Dock = System.Windows.Forms.DockStyle.Fill; this.dataGrid.HeaderForeColor = System.Drawing.SystemColors.ControlText; this.dataGrid.Location = new System.Drawing.Point(0, 0); this.dataGrid.Name = "dataGrid"; this.dataGrid.Size = new System.Drawing.Size(292, 266); this.dataGrid.TabIndex = 0; this.dataGrid.TableStyles.AddRange(new System.Windows.Forms.DataGridTableStyle[] { this.TableStyle}); // // TableStyle // this.TableStyle.AlternatingBackColor = System.Drawing.Color.Wheat; this.TableStyle.BackColor = System.Drawing.Color.LightGray; this.TableStyle.DataGrid = this.dataGrid; this.TableStyle.ForeColor = System.Drawing.Color.MidnightBlue; this.TableStyle.GridColumnStyles.AddRange(new System.Windows.Forms.DataGridColumnStyle[] { this.Status, this.TextBox1, this.TextBox2}); this.TableStyle.GridLineColor = System.Drawing.Color.Black; this.TableStyle.HeaderBackColor = System.Drawing.Color.LightBlue; this.TableStyle.HeaderForeColor = System.Drawing.SystemColors.ControlText; this.TableStyle.MappingName = ""; this.TableStyle.SelectionBackColor = System.Drawing.Color.LightSkyBlue; this.TableStyle.SelectionForeColor = System.Drawing.Color.WhiteSmoke; // // Status // this.Status.Format = ""; this.Status.FormatInfo = null; this.Status.HeaderText = "Status"; this.Status.MappingName = ""; this.Status.NullText = ""; this.Status.Width = 75; // // TextBox1 // this.TextBox1.Format = ""; this.TextBox1.FormatInfo = null; this.TextBox1.HeaderText = "TextBox1"; this.TextBox1.MappingName = ""; this.TextBox1.NullText = ""; this.TextBox1.Width = 75; // // TextBox2 // this.TextBox2.Format = ""; this.TextBox2.FormatInfo = null; this.TextBox2.HeaderText = "TextBox2"; this.TextBox2.MappingName = ""; this.TextBox2.NullText = ""; this.TextBox2.Width = 75; // // BackColorForm // this.AutoScaleBaseSize = new System.Drawing.Size(5, 15); this.ClientSize = new System.Drawing.Size(292, 266); this.Controls.Add(this.dataGrid); this.Name = "BackColorForm"; this.Text = "BackColorForm"; this.Load += new System.EventHandler(this.Form1_Load); ((System.ComponentModel.ISupportInitialize)(this.dataGrid)).EndInit(); this.ResumeLayout(false); } #endregion ///<summary> ///应用程序的主进入点。 ///</summary> [STAThread] static void Main() { Application.Run(new BackColorForm()); } #region User Variable private DataTable UserTable = null; private DataView UserView = null; #endregion private void Form1_Load(object sender, System.EventArgs e) { try { InitDataTable(); InitDataView(); InitDataGrid(); InitData(); } catch( Exception ex ) { MessageBox.Show( ex.Message ); } } private void InitDataTable() { UserTable = new DataTable("UserTable"); DataColumn[] d = new DataColumn[4]; d[0] = new DataColumn("d0",typeof(string)); d[1] = new DataColumn("d1",typeof(string)); d[2] = new DataColumn("d2",typeof(string)); UserTable.Columns.AddRange( d ); TableStyle.MappingName = "UserTable"; Status.MappingName = "d0"; TextBox1.MappingName = "d1"; TextBox2.MappingName = "d2"; } private void InitDataView() { UserView = new DataView(); UserView.Table = UserTable; UserView.AllowNew = false; //将DataView赋给DataGridColoredTextBoxColumn类中的DataView变量 Status.dv = UserView; TextBox1.dv = UserView; TextBox2.dv = UserView; } private void InitDataGrid() { dataGrid.DataSource = UserView; } private void InitData() { DataRow r = null; //Row 1 r = UserTable.NewRow(); r[0] = "critical"; r[1] = "TextBox11"; r[2] = "TextBox21"; UserTable.Rows.Add( r ); //Row 2 r = UserTable.NewRow(); r[0] = "major"; r[1] = "TextBox12"; r[2] = "TextBox22"; UserTable.Rows.Add( r ); //Row 3 r = UserTable.NewRow(); r[0] = "minor"; r[1] = "TextBox13"; r[2] = "TextBox23"; UserTable.Rows.Add( r ); //Row 4 r = UserTable.NewRow(); r[0] = "warning"; r[1] = "TextBox14"; r[2] = "TextBox24"; UserTable.Rows.Add( r ); } } } 运行结果如下： 至此，关于DataGrid的基本用法已经讲完了，DataGrid的功能不仅只是这些，以后我会继续追加关于DataGrid用法的文章。如果是想用ListBox来显示相应的数据并改变背景色的情况，请参见我的另一篇文章 http://blog.csdn.net/tjvictor/archive/2007/01/20/1488378.aspx
