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];
}
}
}
}