比较好的Dapper封装的仓储实现类来源：https://www.cnblogs.com/liuchang/articles/4220671.html

using System;

using System.Collections.Generic;

using System.Data;

using System.Data.SqlClient;

using System.Linq;

using System.Net.Cache;

using System.Text;

using Dapper;

using DapperExtensions;

using TestData.Entity;

using TestData.Business;

namespace TestData.Business

{

    /// <summary>

    /// 业务逻辑的基类  包含了一些简单的操作

    /// </summary>

    /// <typeparam name="T"></typeparam>

    public abstract class BaseManager<T> where T : class, IDataEntity

    {

        /// <summary>

        /// 查询所有

        /// </summary>

        /// <returns></returns>

        public IEnumerable<T> GetAll()

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.GetList<T>();

            }

        }

        /// <summary>

        /// 根绝sql查询

        /// </summary>

        /// <param name="sql">sql</param>

        /// <param name="parameters">参数列表</param>

        /// <returns></returns>

        public IEnumerable<T> SelectCommond(string sql, object parameters = null)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Query<T>(sql, parameters);

            }

        }

        /// <summary>

        /// 根据表明查询

        /// </summary>

        /// <param name="name"></param>

        /// <returns></returns>

        public IEnumerable<T> GetAll(string name)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Query<T>(string.Format("select * from {0}", name));

            }

        }

        /// <summary>

        /// 根据编号查询

        /// </summary>

        /// <param name="id"></param>

        /// <returns></returns>

        public T GetById(int? id)

        {

            if (id == null)

                return default(T);

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Get<T>(id.Value);

            }

        }

        /// <summary>

        /// 修改实体

        /// </summary>

        /// <param name="t">实体对象</param>

        /// <returns></returns>

        public bool Update(T t)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                t.EditorDate = DateTime.Now;

                return conn.Update(t);

            }

        }

        /// <summary>

        /// 得到数量

        /// </summary>

        /// <returns></returns>

        public int GetCount()

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Count<T>(null);

            }

        }

        /// <summary>

        /// 分页

        /// </summary>

        /// <param name="predicate"></param>

        /// <param name="pageindex"></param>

        /// <param name="pageSize"></param>

        /// <returns></returns>

        public Tuple<int, IEnumerable<T>> GetPaged(object predicate, int pageindex, int pageSize)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                var sort = new List<ISort>

                    {

                        Predicates.Sort<T>(p=>p.EditorDate)

                    };

                var total = conn.Count<T>(predicate);

                return new Tuple<int, IEnumerable<T>>(total, conn.GetPage<T>(predicate, sort, pageindex, pageSize).ToList());

            }

        }

        /// <summary>

        /// 添加

        /// </summary>

        /// <param name="t">实体对象</param>

        /// <returns></returns>

        public bool Insert(T t)

        {

            t.EditorDate = DateTime.Now;

            return this.Add(t, false) == t.Id;

        }

        /// <summary>

        /// 添加实体集合

        /// </summary>

        /// <param name="list"></param>

        /// <returns></returns>

        public bool Insert(List<T> list)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                list.ForEach(p => p.EditorDate = DateTime.Now);

                return conn.Insert(list);

            }

        }

        /// <summary>

        /// 添加实体

        /// </summary>

        /// <param name="t">实体对象</param>

        /// <param name="isAutoGenId"></param>

        /// <returns></returns>

        public int Add(T t, bool isAutoGenId = true)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                //var maxindex = conn.Query<int?>(string.Format("select max(indexs) from {0}", typeof(T).Name)).FirstOrDefault() ?? 0;

                //t.Indexs = maxindex + 1;

                return conn.Insert(t, isGenId: isAutoGenId);

            }

        }

        /// <summary>

        /// 根据编号删除

        /// </summary>

        /// <param name="id"></param>

        /// <returns></returns>

        public bool Delete(int? id)

        {

            var obj = this.GetById(id);

            if (obj == null) return false;

            return this.Update(obj);

        }

        /// <summary>

        /// 根据编号修改

        /// </summary>

        /// <param name="id"></param>

        /// <param name="mark"></param>

        /// <returns></returns>

        public bool UpdataStatus(int? id)

        {

            var obj = this.GetById(id);

            if (obj == null) return false;

            return this.Update(obj);

        }

        /// <summary>

        /// 根据外键得到数据

        /// </summary>

        /// <param name="foreignKeyName">外键名称</param>

        /// <param name="foreignKeyValue">外键的值</param>

        /// <returns></returns>

        public IEnumerable<T> GetByForeignKey(string foreignKeyName, Guid foreignKeyValue)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Query<T>(string.Format("select * from {0} where {1}=@value", typeof(T).Name, foreignKeyName), new { value = foreignKeyValue });

            }

        }

        /// <summary>

        /// 根据列查询

        /// </summary>

        /// <param name="fieldName">列名称</param>

        /// <param name="fieldValue">列的值</param>

        /// <returns></returns>

        public IEnumerable<T> GetByField(string fieldName, dynamic fieldValue)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Query<T>(string.Format("select * from {0} where {1}=@value", typeof(T).Name, fieldName), new { value = fieldValue });

            }

        }

        /// <summary>

        /// lxh 根据某列查询的方法--带排序

        /// </summary>

        /// <param name="fieldName">查询列名</param>

        /// <param name="fieldValue">条件内容</param>

        /// <param name="sortFieldName">排序列名</param>

        /// <returns></returns>

        public IEnumerable<T> GetByField(string fieldName, dynamic fieldValue, string sortFieldName)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Query<T>(string.Format("select * from {0} where {1}=@value order by {2}", typeof(T).Name, fieldName, sortFieldName), new { value = fieldValue });

            }

        }

        /// <summary>

        /// lxh 获取排序号的方法

        /// </summary>

        /// <returns></returns>

        public int GetNextSequence(T t)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Query<int>(string.Format("select isnull(max(Sequence),0)+1 from {0}", typeof(T).Name)).FirstOrDefault();

            }

        }

        /// <summary>

        /// 存储过程

        /// </summary>

        /// <param name="procName"></param>

        /// <param name="obj"></param>

        /// <returns></returns>

        public List<dynamic> SelectProc(string procName, object obj = null)

        {

            using (var conn = ConnectionFactory.Connection)

            {

                return conn.Query(procName, obj, commandType: CommandType.StoredProcedure).ToList();

            }

        }

    }

}

using System;using System.Collections.Generic;using System.Data;using System.Data.SqlClient;using System.Linq;using System.Net.Cache;using System.Text;using Dapper;using DapperExtensions;using TestData.Entity;using TestData.Business;
namespace TestData.Business{ /// <summary> /// 业务逻辑的基类包含了一些简单的操作 /// </summary> /// <typeparam name="T"></typeparam> public abstract class BaseManager<T> where T : class, IDataEntity { /// <summary> /// 查询所有 /// </summary> /// <returns></returns> public IEnumerable<T> GetAll() { using (var conn = ConnectionFactory.Connection) { return conn.GetList<T>(); } }
/// <summary> /// 根绝sql查询 /// </summary> /// <param name="sql">sql</param> /// <param name="parameters">参数列表</param> /// <returns></returns> public IEnumerable<T> SelectCommond(string sql, object parameters = null) { using (var conn = ConnectionFactory.Connection) { return conn.Query<T>(sql, parameters); } } /// <summary> /// 根据表明查询 /// </summary> /// <param name="name"></param> /// <returns></returns> public IEnumerable<T> GetAll(string name) { using (var conn = ConnectionFactory.Connection) { return conn.Query<T>(string.Format("select * from {0}", name)); } } /// <summary> /// 根据编号查询 /// </summary> /// <param name="id"></param> /// <returns></returns> public T GetById(int? id) { if (id == null) return default(T); using (var conn = ConnectionFactory.Connection) {
return conn.Get<T>(id.Value); } } /// <summary> /// 修改实体 /// </summary> /// <param name="t">实体对象</param> /// <returns></returns> public bool Update(T t) { using (var conn = ConnectionFactory.Connection) { t.EditorDate = DateTime.Now; return conn.Update(t); } }
/// <summary> /// 得到数量 /// </summary> /// <returns></returns> public int GetCount() { using (var conn = ConnectionFactory.Connection) { return conn.Count<T>(null); } }
/// <summary> /// 分页 /// </summary> /// <param name="predicate"></param> /// <param name="pageindex"></param> /// <param name="pageSize"></param> /// <returns></returns> public Tuple<int, IEnumerable<T>> GetPaged(object predicate, int pageindex, int pageSize) { using (var conn = ConnectionFactory.Connection) { var sort = new List<ISort> { Predicates.Sort<T>(p=>p.EditorDate) };
var total = conn.Count<T>(predicate); return new Tuple<int, IEnumerable<T>>(total, conn.GetPage<T>(predicate, sort, pageindex, pageSize).ToList()); } } /// <summary> /// 添加 /// </summary> /// <param name="t">实体对象</param> /// <returns></returns> public bool Insert(T t) { t.EditorDate = DateTime.Now; return this.Add(t, false) == t.Id; } /// <summary> /// 添加实体集合 /// </summary> /// <param name="list"></param> /// <returns></returns> public bool Insert(List<T> list) { using (var conn = ConnectionFactory.Connection) { list.ForEach(p => p.EditorDate = DateTime.Now); return conn.Insert(list); } }

/// <summary> /// 添加实体 /// </summary> /// <param name="t">实体对象</param> /// <param name="isAutoGenId"></param> /// <returns></returns> public int Add(T t, bool isAutoGenId = true) { using (var conn = ConnectionFactory.Connection) { //var maxindex = conn.Query<int?>(string.Format("select max(indexs) from {0}", typeof(T).Name)).FirstOrDefault() ?? 0; //t.Indexs = maxindex + 1; return conn.Insert(t, isGenId: isAutoGenId); } } /// <summary> /// 根据编号删除 /// </summary> /// <param name="id"></param> /// <returns></returns> public bool Delete(int? id) { var obj = this.GetById(id); if (obj == null) return false; return this.Update(obj); } /// <summary> /// 根据编号修改 /// </summary> /// <param name="id"></param> /// <param name="mark"></param> /// <returns></returns> public bool UpdataStatus(int? id) { var obj = this.GetById(id); if (obj == null) return false; return this.Update(obj); } /// <summary> /// 根据外键得到数据 /// </summary> /// <param name="foreignKeyName">外键名称</param> /// <param name="foreignKeyValue">外键的值</param> /// <returns></returns> public IEnumerable<T> GetByForeignKey(string foreignKeyName, Guid foreignKeyValue) { using (var conn = ConnectionFactory.Connection) { return conn.Query<T>(string.Format("select * from {0} where {1}=@value", typeof(T).Name, foreignKeyName), new { value = foreignKeyValue }); } } /// <summary> /// 根据列查询 /// </summary> /// <param name="fieldName">列名称</param> /// <param name="fieldValue">列的值</param> /// <returns></returns> public IEnumerable<T> GetByField(string fieldName, dynamic fieldValue) { using (var conn = ConnectionFactory.Connection) { return conn.Query<T>(string.Format("select * from {0} where {1}=@value", typeof(T).Name, fieldName), new { value = fieldValue }); } } /// <summary> /// lxh 根据某列查询的方法--带排序 /// </summary> /// <param name="fieldName">查询列名</param> /// <param name="fieldValue">条件内容</param> /// <param name="sortFieldName">排序列名</param> /// <returns></returns> public IEnumerable<T> GetByField(string fieldName, dynamic fieldValue, string sortFieldName) { using (var conn = ConnectionFactory.Connection) { return conn.Query<T>(string.Format("select * from {0} where {1}=@value order by {2}", typeof(T).Name, fieldName, sortFieldName), new { value = fieldValue }); } }
/// <summary> /// lxh 获取排序号的方法 /// </summary> /// <returns></returns> public int GetNextSequence(T t) { using (var conn = ConnectionFactory.Connection) { return conn.Query<int>(string.Format("select isnull(max(Sequence),0)+1 from {0}", typeof(T).Name)).FirstOrDefault(); } } /// <summary> /// 存储过程 /// </summary> /// <param name="procName"></param> /// <param name="obj"></param> /// <returns></returns> public List<dynamic> SelectProc(string procName, object obj = null) { using (var conn = ConnectionFactory.Connection) { return conn.Query(procName, obj, commandType: CommandType.StoredProcedure).ToList(); } } }}

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比较好的Dapper封装的仓储实现类 来源：https://www.cnblogs.com/liuchang/articles/4220671.html