DevExpress GridControl 用路径加载图片，插入到Grid列中

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。

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];            }        }    }}