NetCore AutoMapper的封装
Posted 爱坐枫林晚
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//需要引用AutoMapper的Nuget包
/// <summary> /// 对象映射 /// </summary> public static class Extensions { /// <summary> /// 同步锁 /// </summary> private static readonly object Sync = new object(); /// <summary> /// 将源对象映射到目标对象 /// </summary> /// <typeparam name="TSource">源类型</typeparam> /// <typeparam name="TDestination">目标类型</typeparam> /// <param name="source">源对象</param> /// <param name="destination">目标对象</param> public static TDestination MapTo<TSource, TDestination>(this TSource source, TDestination destination) { return MapTo<TDestination>(source, destination); } /// <summary> /// 将源对象映射到目标对象 /// </summary> /// <typeparam name="TDestination">目标类型</typeparam> /// <param name="source">源对象</param> public static TDestination MapTo<TDestination>(this object source) where TDestination : new() { return MapTo(source, new TDestination()); } /// <summary> /// 将源对象映射到目标对象 /// </summary> private static TDestination MapTo<TDestination>(object source, TDestination destination) { if (source == null) throw new ArgumentNullException(nameof(source)); if (destination == null) throw new ArgumentNullException(nameof(destination)); var sourceType = GetType(source); var destinationType = GetType(destination); var map = GetMap(sourceType, destinationType); if (map != null) return Mapper.Map(source, destination); lock (Sync) { map = GetMap(sourceType, destinationType); if (map != null) return Mapper.Map(source, destination); InitMaps(sourceType, destinationType); } return Mapper.Map(source, destination); } /// <summary> /// 获取类型 /// </summary> private static Type GetType(object obj) { var type = obj.GetType(); if ((obj is System.Collections.IEnumerable) == false) return type; if (type.IsArray) return type.GetElementType(); var genericArgumentsTypes = type.GetTypeInfo().GetGenericArguments(); if (genericArgumentsTypes == null || genericArgumentsTypes.Length == 0) throw new ArgumentException("泛型类型参数不能为空"); return genericArgumentsTypes[0]; } /// <summary> /// 获取映射配置 /// </summary> private static TypeMap GetMap(Type sourceType, Type destinationType) { try { return Mapper.Configuration.FindTypeMapFor(sourceType, destinationType); } catch (InvalidOperationException) { lock (Sync) { try { return Mapper.Configuration.FindTypeMapFor(sourceType, destinationType); } catch (InvalidOperationException) { InitMaps(sourceType, destinationType); } return Mapper.Configuration.FindTypeMapFor(sourceType, destinationType); } } } /// <summary> /// 初始化映射配置 /// </summary> private static void InitMaps(Type sourceType, Type destinationType) { try { var maps = Mapper.Configuration.GetAllTypeMaps(); Mapper.Initialize(config => { ClearConfig(); foreach (var item in maps) config.CreateMap(item.SourceType, item.DestinationType); config.CreateMap(sourceType, destinationType); }); } catch (InvalidOperationException) { Mapper.Initialize(config => { config.CreateMap(sourceType, destinationType); }); } } /// <summary> /// 清空配置 /// </summary> private static void ClearConfig() { var typeMapper = typeof(Mapper).GetTypeInfo(); var configuration = typeMapper.GetDeclaredField("_configuration"); configuration.SetValue(null, null, BindingFlags.Static, null, CultureInfo.CurrentCulture); } /// <summary> /// 将源集合映射到目标集合 /// </summary> /// <typeparam name="TDestination">目标元素类型,范例:Sample,不要加List</typeparam> /// <param name="source">源集合</param> public static List<TDestination> MapToList<TDestination>(this System.Collections.IEnumerable source) { return MapTo<List<TDestination>>(source); } }
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