MyUser.cs
namespace XMLSpy.Linq{
    public class MyUser{
        /// <summary>
        /// 设置或获取用户ID
        /// </summary>
        public int Id { get; set; }

/// <summary>
        /// 设置或获取用户名称
        /// </summary>
        public string Name { set; get; }
    }
}

YourUser
namespace XMLSpy.Linq{
    public class YourUser{
        /// <summary>
        /// 设置或获取用户ID
        /// </summary>
        public int Id { get; set; }

/// <summary>
        /// 设置或获取用户名称
        /// </summary>
        public string Name { set; get; }
    }
}

TypeCast .cs
using System.Collections.Generic;
using System.Linq;

namespace XMLSpy.Linq {
    /// <summary>
    /// 在不同类型之间转换
    /// Author : xmlspy.spring@gmail.com
    /// </summary>
    public class TypeCast {
        /// <summary>
        /// 把YourUser[]转换为MyUser[]
        /// </summary>
        /// <param name="yourUsers"></param>
        /// <returns></returns>
        public MyUser[] ToMyUsers(YourUser[] yourUsers) {
            MyUser[] myUsers = null;
            // 方式1: 使用Linq
            myUsers = (from user in yourUsers
                       select new MyUser
                              {
                                  Id = user.Id, 
                                  Name = user.Name
                              }).ToArray();
            // 方式2: 使用Lambda表达式
            myUsers = yourUsers.Select(user => new MyUser
                                               {
                                                   Id = user.Id, 
                                                   Name = user.Name
                                               }).ToArray();

return myUsers;
        }

/// <summary>
        /// 把List<YourUser>转换为List<MyUser>
        /// </summary>
        public List<MyUser> ToMyUserList(List<YourUser> yourUsers) {
            List<MyUser> myUsers = null;
            // 方式1: 使用Linq
            myUsers = (from user in yourUsers
                       select new MyUser
                              {
                                  Id = user.Id,
                                  Name = user.Name
                              }).ToList();
            // 方式2: 使用Lambda表达式
            myUsers = yourUsers.Select(user => new MyUser
                                               {
                                                   Id = user.Id, 
                                                   Name = user.Name
                                               }).ToList();

return myUsers;
        }
    }
}