上一篇有一個讀者，有疑問，如何自動化注冊Dto

我開篇，做了一個自動化注冊的

public sealed class AutoInjectAttribute : Attribute{public Type SourceType { get; }public Type TargetType { get; }public AutoInjectAttribute(Type sourceType, Type targetType){SourceType = sourceType;TargetType = targetType;}}

增加了一個特性，在Dto上面打上，參數1是源類型，參數2是Dto類型

增加一個工廠類保存自動轉換的類型

public class AutoInjectFactory{public List<(Type,Type)> ConvertList { get; } = new List<(Type, Type)>();public void AddAssemblys(params Assembly[] assemblys){foreach (var assembly in assemblys){var atributes = assembly.GetTypes().Where(_type => _type.GetCustomAttribute<AutoInjectAttribute>() != null).Select(_type => _type.GetCustomAttribute<AutoInjectAttribute>());foreach (var atribute in atributes){ConvertList.Add((atribute.SourceType, atribute.TargetType));}}}}

在原來的AddAutoMapper上找到修改的代碼段

public static IServiceCollection AddAutoMapper(this IServiceCollection service){...略service.TryAddSingleton(serviceProvider =>{var mapperConfigurationExpression = serviceProvider.GetRequiredService<MapperConfigurationExpression>();var instance = new MapperConfiguration(mapperConfigurationExpression);instance.AssertConfigurationIsValid();return instance;});...略return service;}

改為

public static IServiceCollection AddAutoMapper(this IServiceCollection service){...略service.TryAddSingleton(serviceProvider =>{var mapperConfigurationExpression = serviceProvider.GetRequiredService<MapperConfigurationExpression>();var factory = serviceProvider.GetRequiredService<AutoInjectFactory>();foreach (var (sourceType,targetType) in factory.ConvertList){mapperConfigurationExpression.CreateMap(sourceType, targetType);}var instance = new MapperConfiguration(mapperConfigurationExpression);instance.AssertConfigurationIsValid();return instance;});...略return service;}

增加一組擴展方法

public static class AutoMapperExtension{...略public static void UseAutoInject(this IApplicationBuilder applicationBuilder, params Assembly[] assemblys){var factory = applicationBuilder.ApplicationServices.GetRequiredService<AutoInjectFactory>();factory.AddAssemblys(assemblys);}}

在Startup.Configure方法內調用一下

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看看測試

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增加一個測試控制器

執行結果

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轉載于:https://www.cnblogs.com/NCoreCoder/p/11453443.html

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