AutoMapper extension methods

Problem description

A custom pagedlist is implemented in the system.

<summary>//Paged List interface//</summary> public interface ipagedlist {int Pag        Eindex {get;}        int PageSize {get;}        int TotalCount {get;}        int totalpages {get;}        BOOL Haspreviouspage {get;}    BOOL Hasnextpage {get;} }//<summary>//Paged List interface//</summary> public interface ipagedlist<t>: ILi St<t&gt, ipagedlist {}///<summary>//Paged list//</summary>//<typeparam name= "        T ">T</typeparam> [Serializable] public class pagedlist<t>: List<t>, ipagedlist<t> { <summary>//Ctor//</summary>/<param name= "source" >source</pa ram>//<param name= "PageIndex" >page index</param>//<param name= "PageSize" >page siz E</param> public pagedlist (iqueryable<t> source, int pageIndex, int pagesize) {int total = source.            Count (); This.            TotalCount = total; This.            TotalPages = total/pagesize;            If (total% pageSize > 0) totalpages++; This.            PageSize = PageSize; This.            PageIndex = PageIndex; This. AddRange (source. Skip (PageIndex * pageSize). Take (pageSize).        ToList ()); }//<summary>//Ctor//</summary>/<param name= "source" >source</ param>//<param name= "PageIndex" >page index</param>//<param name= "PageSize" >page s Ize</param> public pagedlist (ilist<t> source, int pageIndex, int pageSize) {Totalcou NT = source.            Count ();            TotalPages = totalcount/pagesize;            if (totalcount% pageSize > 0) totalpages++; This.            PageSize = PageSize; This.            PageIndex = PageIndex; This. AddRange (source. Skip (PAGeindex * pageSize). Take (pageSize).        ToList ()); }//<summary>//Ctor//</summary>/<param name= "source" >source</ param>//<param name= "PageIndex" >page index</param>//<param name= "PageSize" >page s ize</param>//<param name= "TotalCount" >total count</param> public pagedlist (IEnumerable& Lt            t> source, int pageIndex, int pageSize, int totalcount) {totalcount = TotalCount;            TotalPages = totalcount/pagesize;            if (totalcount% pageSize > 0) totalpages++; This.            PageSize = PageSize; This.            PageIndex = PageIndex; This.        AddRange (source);        } public int PageIndex {get; private set;}        public int PageSize {get; private set;}        public int TotalCount {get; private set;}        public int TotalPages {get; private set;} public bool Haspreviouspage {get {return (PageIndex > 0);}        } public bool Hasnextpage {get {return (PageIndex + 1 < totalpages);} }    }

Conversion failed, AutoMapper don't know pagedlist

[TestMethod] public void MapTest2 () {mapper.createmap<user, userviewmodel> ();                var userlist = new List<user> () {new User () {Name = "Name1", UserId = "UserId1"},                New User () {name = "Name2", UserID = "UserId2"}, new User () {name = "Name3", UserID = "UserId3"}, New User () {name = "Name4", UserID = "UserId4"}, new User () {name = "Name5", UserID = "UserID 5 "}, new User () {name =" Name6 ", UserID =" UserId6 "}, new User () {name =" Name7 ", UserID ="            UserId7 "},};                        var pagedlist = new Pagedlist<user> (userlist, 0, 5); Mapper.map<pagedlist<user&gt, pagedlist<userviewmodel>> (pagedlist);//Exception}

Solution Solutions

 <summary>//the collection extensions.        </summary> public static class Objectextensions {private static readonly MethodInfo Mapmethod; private static readonly Concurrentdictionary<tuple<type, Type>, Tuple<methodinfo, type>> MethodsMap        per = new Concurrentdictionary<tuple<type, Type>, Tuple<methodinfo, type>> (); Static objectextensions () {Mapmethod = (typeof (Mapper)). GetMethods (). FirstOrDefault (_ = = _. Name = = "Map" && _. GetParameters ().        Length = = 1); public static T mapto<t> (this ipagedlist tList) where T:class {var totalcount = tList.            TotalCount;            var pageIndex = Tlist.pageindex;            var pageSize = tlist.pagesize;                var t = methodsmapper.getoradd (new Tuple<type, type> (Tlist.gettype (), typeof (T)), _ = = { var targetgenericarguments = typeof (T). Generictypearguments[0];               var targetgenericargumentsienumerabletype = typeof (Ienumerable<>).                MakeGenericType (targetgenericarguments);                    return new Tuple<methodinfo, type> (Mapmethod.makegenericmethod (Targetgenericargumentsienumerabletype), typeof (Pagedlist<>).            MakeGenericType (targetgenericarguments));            });            var rtn2 = T.item1.invoke (null, new object[] {tList});            var O2 = Activator.CreateInstance (t.item2, RTN2, PageIndex, PageSize, totalcount) as T;        return O2; public static T mapto<t> (This object o) where T:class {//way1//var mapmeth od = (typeof (Mapper)). GetMethods (). FirstOrDefault (_ = = _. Name = = "Map" && _. GetParameters (). Length = = 1 && _. GetGenericArguments ().            Length = = 2);            var m2 = Mapmethod.makegenericmethod (O.gettype (), typeof (T)); return m2.            Invoke (null, new[] {o}) as T; Way2 RETurn mapper.map<t> (o);        public static void Mapto<s,t> (this S o,t T) where T:class {mapper.map (o,t); }    }

Test Pass

[TestMethod] public void MapTest2 () {mapper.createmap<user, userviewmodel> ();                var userlist = new List<user> () {new User () {Name = "Name1", UserId = "UserId1"},                New User () {name = "Name2", UserID = "UserId2"}, new User () {name = "Name3", UserID = "UserId3"}, New User () {name = "Name4", UserID = "UserId4"}, new User () {name = "Name5", UserID = "UserID 5 "}, new User () {name =" Name6 ", UserID =" UserId6 "}, new User () {name =" Name7 ", UserID ="            UserId7 "},};            var pagedlist = new Pagedlist<user> (userlist, 0, 5);            var vmpagedlist = pagedlist.mapto<pagedlist<userviewmodel>> (); Assert.istrue (Vmpagedlist.totalpages = = 2 && vmpagedlist.pagesize = = 5 && V        Mpagedlist.pageindex = = 0); }

Summarize

The runtime dynamically acquires generic parameters and executes mapper.map<ienumerable<tsource>, Ienumerable<tdestination>> and use Concurrentdictionary cache MethodInfo to improve performance.

AutoMapper extension methods