如何绑定IList集合中对象的复合属性到DataGrid中。

有如下代码： 

/**//*
 * Created by: 
 * Created: 2006年12月23日
 */

using System;

namespace TestObjectToDataGrid
...{
    public class User
    ...{
        private int id;
        private string name;
        private float total;
        private Address address;

        public int Id
        ...{
            get ...{ return id; }
            set ...{ id = value; }
        }

        public string Name
        ...{
            get ...{ return name; }
            set ...{ name = value; }
        }

        public float Total
        ...{
            get ...{ return total; }
            set ...{ total = value; }
        }

        public Address Address
        ...{
            get ...{ return address; }
            set ...{ address = value; }
        }
        
        public string GetAddress
        ...{
            get ...{ return address.ToString(); }
        }
    }

    public class Address
    ...{
        private string qq;
        private string email;

        public string Qq
        ...{
            get ...{ return qq; }
            set ...{ qq = value; }
        }

        public string Email
        ...{
            get ...{ return email; }
            set ...{ email = value; }
        }

    
        public new string ToString()
        ...{
            return email + ":" + qq;
        }
    }
}

数据源类：

/**//*
 * Created by: 
 * Created: 2006年12月23日
 */

using System.Collections;

namespace TestObjectToDataGrid
...{
    public class DataSource
    ...{
        public static IList GetDs()
        ...{
            IList list = new ArrayList();
            for (int i = 0; i < 10; i++)
            ...{
                User user = new User();
                user.Id = i;
                user.Name = "name" + i;
                user.Total = i*9.9f;
                Address add = new Address();
                add.Qq = "qq" + i;
                add.Email = "email" + i;
                user.Address = add;
                list.Add(user);
            }
            return list;
        }
    }
}

将Address中的属性绑定到DataGrid中，有如下代码：

 

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace TestObjectToDataGrid
...{
    /**//// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    ...{
        private System.Windows.Forms.DataGrid dgUsers;
        private System.Windows.Forms.Button btnLoad;
        private System.Windows.Forms.DataGridTableStyle dgsMain;
        private System.Windows.Forms.DataGridTextBoxColumn dgcName;
        private System.Windows.Forms.DataGridTextBoxColumn dgcId;
        private System.Windows.Forms.DataGridTextBoxColumn dgcQq;
        private System.Windows.Forms.DataGridTextBoxColumn dgcEmail;
        private System.Windows.Forms.ComboBox ddlUser;
        /**//// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        ...{
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /**//// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        ...{
            if( disposing )
            ...{
                if (components != null) 
                ...{
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        Windows 窗体设计器生成的代码#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.dgUsers = new System.Windows.Forms.DataGrid();
            this.dgsMain = new System.Windows.Forms.DataGridTableStyle();
            this.dgcName = new System.Windows.Forms.DataGridTextBoxColumn();
            this.dgcId = new System.Windows.Forms.DataGridTextBoxColumn();
            this.dgcQq = new System.Windows.Forms.DataGridTextBoxColumn();
            this.dgcEmail = new System.Windows.Forms.DataGridTextBoxColumn();
            this.btnLoad = new System.Windows.Forms.Button();
            this.ddlUser = new System.Windows.Forms.ComboBox();
            ((System.ComponentModel.ISupportInitialize)(this.dgUsers)).BeginInit();
            this.SuspendLayout();
            // 
            // dgUsers
            // 
            this.dgUsers.DataMember = "";
            this.dgUsers.HeaderForeColor = System.Drawing.SystemColors.ControlText;
            this.dgUsers.Location = new System.Drawing.Point(0, 64);
            this.dgUsers.Name = "dgUsers";
            this.dgUsers.Size = new System.Drawing.Size(292, 208);
            this.dgUsers.TabIndex = 0;
            this.dgUsers.TableStyles.AddRange(new System.Windows.Forms.DataGridTableStyle[] ...{
                                                                                                this.dgsMain});
            // 
            // dgsMain
            // 
            this.dgsMain.DataGrid = this.dgUsers;
            this.dgsMain.GridColumnStyles.AddRange(new System.Windows.Forms.DataGridColumnStyle[] ...{
                                                                                                      this.dgcName,
                                                                                                      this.dgcId,
                                                                                                      this.dgcQq,
                                                                                                      this.dgcEmail});
            this.dgsMain.HeaderForeColor = System.Drawing.SystemColors.ControlText;
            this.dgsMain.MappingName = "";
            // 
            // dgcName
            // 
            this.dgcName.Format = "";
            this.dgcName.FormatInfo = null;
            this.dgcName.HeaderText = "姓名";
            this.dgcName.MappingName = "Name";
            this.dgcName.Width = 75;
            // 
            // dgcId
            // 
            this.dgcId.Format = "";
            this.dgcId.FormatInfo = null;
            this.dgcId.HeaderText = "学号";
            this.dgcId.MappingName = "Id";
            this.dgcId.Width = 75;
            // 
            // dgcQq
            // 
            this.dgcQq.Format = "";
            this.dgcQq.FormatInfo = null;
            this.dgcQq.HeaderText = "总额";
            this.dgcQq.MappingName = "total";
            this.dgcQq.Width = 75;
            // 
            // dgcEmail
            // 
            this.dgcEmail.Format = "";
            this.dgcEmail.FormatInfo = null;
            this.dgcEmail.HeaderText = "电子邮件";
            this.dgcEmail.MappingName = "GetAddress";
            this.dgcEmail.Width = 150;
            // 
            // btnLoad
            // 
            this.btnLoad.Location = new System.Drawing.Point(24, 20);
            this.btnLoad.Name = "btnLoad";
            this.btnLoad.Size = new System.Drawing.Size(68, 24);
            this.btnLoad.TabIndex = 1;
            this.btnLoad.Text = "Load";
            this.btnLoad.Click += new System.EventHandler(this.btnLoad_Click);
            // 
            // ddlUser
            // 
            this.ddlUser.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.ddlUser.Location = new System.Drawing.Point(116, 20);
            this.ddlUser.Name = "ddlUser";
            this.ddlUser.Size = new System.Drawing.Size(116, 20);
            this.ddlUser.TabIndex = 2;
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(292, 273);
            this.Controls.Add(this.ddlUser);
            this.Controls.Add(this.btnLoad);
            this.Controls.Add(this.dgUsers);
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)(this.dgUsers)).EndInit();
            this.ResumeLayout(false);

        }
        #endregion

        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
        ...{
            Application.Run(new Form1());
        }

        private void btnLoad_Click(object sender, System.EventArgs e)
        ...{
            IList list = DataSource.GetDs();
            dgUsers.DataSource = list;
            dgsMain.DataGrid = dgUsers;
            dgsMain.MappingName = "ArrayList";
            
            ddlUser.DataSource = list;
            ddlUser.DisplayMember = "Name";
            ddlUser.ValueMember = "Id";
        }

        private void btnShow_Click(object sender, System.EventArgs e)
        ...{
            
        }
        
    }
}

在这里我没有找到直接将Address类的Qq属性绑定到DataGrid的方法，我只能通过多做一个只读属性，才能在DataGrid中显示。哪位高人有没有好办法，分享一下。