要实现该功能,可通过非绑定列的方式来实现。具体实现方法如下:
1.创建了一个非绑定列并设置其相应的属性,属性设置如下:
FieldName设为 Image (该字段名必须是唯一的)
UnboundType设为 UnboundColumnType.Object
ColumnEdit设为RepositoryItemPictureEdit类的实例(该操作PictureEdit 为该列的内置编辑器)
2. 处理View的CustomUnboundColumnData事件,用于为非绑定列填充数据。在该事件中需加载图片,将其存放在一个hashtable中,然后再将其提供给对应的单元格。
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using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using DevExpress.XtraGrid.Views.Grid; namespace LoadExternalImages { /// <summary> /// Summary description for Form1. /// </summary> public class Form1 : System.Windows.Forms.Form { private DevExpress.XtraGrid.GridControl gridControl1; private DevExpress.XtraGrid.Views.Grid.GridView gridView1; private System.Windows.Forms.Label label1; private DevExpress.XtraGrid.Columns.GridColumn columnID; private DevExpress.XtraGrid.Columns.GridColumn columnName; private DevExpress.XtraGrid.Columns.GridColumn columnColor; private DevExpress.XtraGrid.Columns.GridColumn columnImage; private DevExpress.XtraEditors.Repository.RepositoryItemPictureEdit repositoryItemPictureEdit1; private DevExpress.XtraEditors.Repository.RepositoryItemComboBox repositoryItemComboBox1; /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null; public Form1() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // InitData(); } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.gridControl1 = new DevExpress.XtraGrid.GridControl(); this.gridView1 = new DevExpress.XtraGrid.Views.Grid.GridView(); this.columnID = new DevExpress.XtraGrid.Columns.GridColumn(); this.columnName = new DevExpress.XtraGrid.Columns.GridColumn(); this.columnColor = new DevExpress.XtraGrid.Columns.GridColumn(); this.repositoryItemComboBox1 = new DevExpress.XtraEditors.Repository.RepositoryItemComboBox(); this.columnImage = new DevExpress.XtraGrid.Columns.GridColumn(); this.repositoryItemPictureEdit1 = new DevExpress.XtraEditors.Repository.RepositoryItemPictureEdit(); this.label1 = new System.Windows.Forms.Label(); ((System.ComponentModel.ISupportInitialize)(this.gridControl1)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this.gridView1)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this.repositoryItemComboBox1)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this.repositoryItemPictureEdit1)).BeginInit(); this.SuspendLayout(); // // gridControl1 // this.gridControl1.Dock = System.Windows.Forms.DockStyle.Fill; this.gridControl1.EmbeddedNavigator.Name = ""; this.gridControl1.Location = new System.Drawing.Point(0, 23); this.gridControl1.LookAndFeel.SkinName = "The Asphalt World"; this.gridControl1.LookAndFeel.UseDefaultLookAndFeel = false; this.gridControl1.MainView = this.gridView1; this.gridControl1.Name = "gridControl1"; this.gridControl1.RepositoryItems.AddRange(new DevExpress.XtraEditors.Repository.RepositoryItem[] { this.repositoryItemPictureEdit1, this.repositoryItemComboBox1}); this.gridControl1.Size = new System.Drawing.Size(527, 286); this.gridControl1.TabIndex = 0; this.gridControl1.ViewCollection.AddRange(new DevExpress.XtraGrid.Views.Base.BaseView[] { this.gridView1}); // // gridView1 // this.gridView1.Columns.AddRange(new DevExpress.XtraGrid.Columns.GridColumn[] { this.columnID, this.columnName, this.columnColor, this.columnImage}); this.gridView1.GridControl = this.gridControl1; this.gridView1.Name = "gridView1"; this.gridView1.OptionsView.ShowGroupPanel = false; this.gridView1.RowHeight = 33; this.gridView1.CustomUnboundColumnData += new DevExpress.XtraGrid.Views.Base.CustomColumnDataEventHandler(this.gridView1_CustomUnboundColumnData); // // columnID // this.columnID.Caption = "ID"; this.columnID.FieldName = "ID"; this.columnID.Name = "columnID"; this.columnID.OptionsColumn.ReadOnly = true; this.columnID.Visible = true; this.columnID.VisibleIndex = 0; this.columnID.Width = 81; // // columnName // this.columnName.Caption = "Name"; this.columnName.FieldName = "Name"; this.columnName.Name = "columnName"; this.columnName.Visible = true; this.columnName.VisibleIndex = 1; this.columnName.Width = 132; // // columnColor // this.columnColor.Caption = "Color"; this.columnColor.ColumnEdit = this.repositoryItemComboBox1; this.columnColor.FieldName = "Color"; this.columnColor.Name = "columnColor"; this.columnColor.Visible = true; this.columnColor.VisibleIndex = 2; this.columnColor.Width = 152; // // repositoryItemComboBox1 // this.repositoryItemComboBox1.AutoHeight = false; this.repositoryItemComboBox1.Buttons.AddRange(new DevExpress.XtraEditors.Controls.EditorButton[] { new DevExpress.XtraEditors.Controls.EditorButton(DevExpress.XtraEditors.Controls.ButtonPredefines.Combo)}); this.repositoryItemComboBox1.Items.AddRange(new object[] { "Black", "Blue", "Green", "Magenta", "Orange", "Pink", "Red", "White", "Yellow"}); this.repositoryItemComboBox1.Name = "repositoryItemComboBox1"; // // columnImage // this.columnImage.Caption = "Image (unbound)"; this.columnImage.ColumnEdit = this.repositoryItemPictureEdit1; this.columnImage.FieldName = "Image"; this.columnImage.Name = "columnImage"; this.columnImage.OptionsColumn.AllowEdit = false; this.columnImage.UnboundType = DevExpress.Data.UnboundColumnType.Object; this.columnImage.Visible = true; this.columnImage.VisibleIndex = 3; this.columnImage.Width = 118; // // repositoryItemPictureEdit1 // this.repositoryItemPictureEdit1.Name = "repositoryItemPictureEdit1"; // // label1 // this.label1.Dock = System.Windows.Forms.DockStyle.Top; this.label1.Font = new System.Drawing.Font("Microsoft Sans Serif", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(204))); this.label1.Location = new System.Drawing.Point(0, 0); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(527, 23); this.label1.TabIndex = 1; this.label1.Text = "What\'s your favorite color?"; // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(527, 309); this.Controls.Add(this.gridControl1); this.Controls.Add(this.label1); this.Name = "Form1"; this.Text = "Form1"; ((System.ComponentModel.ISupportInitialize)(this.gridControl1)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this.gridView1)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this.repositoryItemComboBox1)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this.repositoryItemPictureEdit1)).EndInit(); this.ResumeLayout(false); } #endregion /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); } private void InitData() { string DBFileName = DevExpress.Utils.FilesHelper.FindingFileName(Application.StartupPath, "db.mdb"); if(DBFileName != "") { DataSet ds = new DataSet(); string con = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + DBFileName; System.Data.OleDb.OleDbDataAdapter oleDbDataAdapter = new System.Data.OleDb.OleDbDataAdapter("SELECT * FROM PeopleColors", con); oleDbDataAdapter.Fill(ds, "PeopleColors"); gridControl1.DataSource = ds.Tables["PeopleColors"]; } } string ImageDir = @"Images\"; Hashtable Images = new Hashtable(); //获取文件路径 string GetFileName(string color) { if(color == null || color == string.Empty) return string.Empty; return color + ".jpg"; } private void gridView1_CustomUnboundColumnData(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDataEventArgs e) { if(e.Column.FieldName == "Image" && e.IsGetData) { GridView view = sender as GridView; string colorName = (string)((DataRowView)e.Row)["Color"]; string fileName = GetFileName(colorName).ToLower(); if(!Images.ContainsKey(fileName)) { Image img = null; try { string filePath = DevExpress.Utils.FilesHelper.FindingFileName(Application.StartupPath, ImageDir + fileName, false); img = Image.FromFile(filePath); } catch { } Images.Add(fileName, img); } e.Value = Images[fileName]; } } } }