Linq To Entity学习实践

    public class CustomDataContext<TEntity> : System.Data.Linq.DataContext
        where TEntity : class,new()
    {
        public CustomDataContext() :
            base(ConfigurationManager.AppSettings["TestDbConnectionString"])
        {
        }

        #region 创建一个新对象
        public bool Create(TEntity entity)
        {
            EntityList.InsertOnSubmit(entity);
            SubmitChanges();
            return true;
        }

        public bool Create(IEnumerable<TEntity> entities)
        {
            EntityList.InsertAllOnSubmit(entities);
            SubmitChanges();
            return true;
        }
        #endregion

        #region 删除一个对象
        public bool Delete(TEntity entity)
        {
            EntityList.DeleteOnSubmit(entity);
            SubmitChanges();
            return true;
        }

        public bool Delete(IEnumerable<TEntity> entities)
        {
            EntityList.DeleteAllOnSubmit(entities);
            SubmitChanges();
            return true;
        }
        #endregion

        #region 修改对象
        public bool Modify(TEntity entity)
        {
            EntityList.Attach(entity, true);
            SubmitChanges();
            return true;
        }

        public bool Modify(IEnumerable<TEntity> entities)
        {
            EntityList.AttachAll(entities, true);
            SubmitChanges();
            return true;
        }
        #endregion

        #region 查询对象
        public TEntity GetEntity(Expression<Func<TEntity, bool>> predicate)
        {
            return EntityList.FirstOrDefault(predicate);
        }
        public IList<TEntity> GetList()
        {
            return EntityList.ToList();
        }
        public IQueryable<TEntity> GetList(Expression<Func<TEntity, bool>> predicate)
        {
            return EntityList.Where(predicate);
        }
        #endregion

        public System.Data.Linq.Table<TEntity> EntityList
        {
            get
            {
                return this.GetTable<TEntity>();
            }
        }
    }

    [Table(Name = "dbo.DemoClass")]
    public class DemoClass
    {
        public DemoClass()
        {
        }

        [Column(Name = "ID", IsPrimaryKey = true, IsDbGenerated = true)]
        public int ID
        {
            get;
            set;
        }

        [Column(Name = "UserName")]
        public string UserName
        {
            get;
            set;
        }

        [Column(Name = "Phone")]
        public string Phone
        {
            get;
            set;
        }

        [Column(Name = "Email")]
        public string Email
        {
            get;
            set;
        }

        [Column(Name = "Password")]
        public string Password
        {
            get;
            set;
        }
    }

            DemoClass model = new DemoClass();
            model.UserName = "zhagnsan";
            model.Phone = "12345678901";
            model.Email = "zhangsan@163.com";
            model.Password = "123";
            using (var context = new CustomDataContext<DemoClass>())
            {
                if (model != null)
                {
                    context.Create(model);
                }
            }

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.Linq.Mapping;
using System.Linq;
using System.Linq.Expressions;