list泛型绑定cbo出现无法绑定到新的显示成员

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace FlashDemo

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

/// <summary>

/// 必需的设计器变量。

/// </summary>

private System.ComponentModel.IContainer components = null;

/// <summary>

/// 清理所有正在使用的资源。

/// </summary>

/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

protected override void Dispose(bool disposing)

{

if (disposing && (components != null))

{

components.Dispose();

}

base.Dispose(disposing);

}

#region Windows 窗体设计器生成的代码

/// <summary>

/// 设计器支持所需的方法 - 不要

/// 使用代码编辑器修改此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.cbDepart = new System.Windows.Forms.ComboBox();

this.SuspendLayout();

//

// comboBox1

//

this.cbDepart.FormattingEnabled = true;

this.cbDepart.Location = new System.Drawing.Point(100, 55);

this.cbDepart.Name = "comboBox1";

this.cbDepart.Size = new System.Drawing.Size(121, 20);

this.cbDepart.TabIndex = 0;

//

// Form1

//

this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.ClientSize = new System.Drawing.Size(292, 266);

this.Controls.Add(this.cbDepart);

this.Name = "Form1";

this.Text = "Form1";

this.Load += new System.EventHandler(this.Form1_Load);

this.ResumeLayout(false);

}

#endregion

private System.Windows.Forms.ComboBox cbDepart;

private void Form1_Load(object sender, EventArgs e)

{

BindComBox();

this.cbDepart.SelectedValue="3";

}

private void BindComBox()

{

List <Depart>list = new List<Depart>();

Depart d1 = new Depart( "1", "销售部" );

Depart d2 = new Depart ( "2", "技术部" );

Depart d3 = new Depart ("3", "生产部" );

list.Add(d1);

list.Add(d2);

list.Add(d3);

cbDepart.DataSource = list;

cbDepart.DisplayMember = "DepartName";

cbDepart.ValueMember = "ID";

}

}

public class Depart

{

protected string _ID;

protected string _DepartName;

public

Depart(string ID, string DepartName)

{

this._ID = ID;

this._DepartName = DepartName;

}

public string ID

{

get

{

return this._ID;

}

set

{

_ID = value;

}

}

public string DepartName

{

get

{

return _DepartName;

}

set

{

_DepartName = value;

}

}

}

}