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>();
             }
         }
     }

CustomDataContext

     [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

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

测试

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