Asp.net core 在DI实例上使用AutoMapper 8 ProjectTo_Asp.net Core_Dependency Injection_Automapper

Asp.net core 在DI实例上使用AutoMapper 8 ProjectTo

asp.net-core dependency-injection

Asp.net core 在DI实例上使用AutoMapper 8 ProjectTo,asp.net-core,dependency-injection,automapper,Asp.net Core,Dependency Injection,Automapper,我正在使用AutoMapper.Extensions.Microsoft.DependencyInjectionNuGet包中提供的AddAutoMapper方法将AutoMapper安装到ASP.NET Core 2.2 web应用程序中它在将单个实体映射到模型和模型时非常有效-我可以毫无问题地做到这一点： mapper.Map<Model>(context.Set<Entity>().First()); 及 context.Set（）.ProjectTo（mapp

我正在使用

AutoMapper.Extensions.Microsoft.DependencyInjection

NuGet包中提供的

AddAutoMapper

方法将AutoMapper安装到ASP.NET Core 2.2 web应用程序中

它在将单个实体映射到模型和模型时非常有效-我可以毫无问题地做到这一点：

mapper.Map<Model>(context.Set<Entity>().First());

及

context.Set（）.ProjectTo（mapper.ConfigurationProvider）；

无论哪种方式，我都会得到相同的错误：

System.ArgumentException: Static method requires null instance, non-static method requires non-null instance.
   at System.Linq.Expressions.Expression.ValidateStaticOrInstanceMethod(Expression instance, MethodInfo method)
   at System.Linq.Expressions.Expression.ValidateMethodAndGetParameters(Expression instance, MethodInfo method)
   at System.Linq.Expressions.Expression.Call(MethodInfo method, Expression arg0)
   at AutoMapper.QueryableExtensions.Impl.MemberGetterExpressionResultConverter.ExpressionResolutionResult(ExpressionResolutionResult expressionResolutionResult, MemberInfo getter) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\Impl\MemberGetterExpressionResultConverter.cs:line 24
   at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func)
   at AutoMapper.QueryableExtensions.ExpressionBuilder.ResolveExpression(PropertyMap propertyMap, Type currentType, Expression instanceParameter, LetPropertyMaps letPropertyMaps) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 308
   at AutoMapper.QueryableExtensions.ExpressionBuilder.<>c__DisplayClass17_0.<CreateMemberBindings>g__CreateMemberBinding|0(PropertyMap propertyMap) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 272
   at AutoMapper.QueryableExtensions.ExpressionBuilder.CreateMemberBindings(ExpressionRequest request, TypeMap typeMap, Expression instanceParameter, IDictionary`2 typePairCount, LetPropertyMaps letPropertyMaps) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 266
   at AutoMapper.QueryableExtensions.ExpressionBuilder.CreateMapExpressionCore(ExpressionRequest request, Expression instanceParameter, IDictionary`2 typePairCount, TypeMap typeMap, LetPropertyMaps letPropertyMaps) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 204
   at AutoMapper.QueryableExtensions.ExpressionBuilder.CreateMapExpression(ExpressionRequest request, IDictionary`2 typePairCount, LetPropertyMaps letPropertyMaps) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 152
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at AutoMapper.QueryableExtensions.ExpressionBuilder.GetMapExpression(Type sourceType, Type destinationType, Object parameters, MemberInfo[] membersToExpand) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 98
   at AutoMapper.QueryableExtensions.ProjectionExpression.To[TResult](Object parameters, Expression`1[] membersToExpand) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ProjectionExpression.cs:line 60
   at AutoMapper.QueryableExtensions.Extensions.ProjectTo[TDestination](IQueryable source, IConfigurationProvider configuration, Expression`1[] membersToExpand) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\Extensions.cs:line 76

System.ArgumentException:静态方法需要空实例，非静态方法需要非空实例。
位于System.Linq.Expressions.Expression.ValidateStaticOrInstanceMethod（表达式实例，MethodInfo方法）
位于System.Linq.Expressions.Expression.ValidateMethodAndGetParameters（表达式实例，MethodInfo方法）
在System.Linq.Expressions.Expression.Call（MethodInfo方法，表达式arg0）中
在C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\Impl.MemberGetterExpressionResultConverter.ExpressionResolutionResult（ExpressionResolutionResult ExpressionResult，MemberInfo getter）中的AutoMapper.QueryableExtensions.Impl.MemberGetterExpressionResultConverter.ExpressionResolutionResult（ExpressionResolutionResult，MemberInfo getter），第24行
at System.Linq.Enumerable.Aggregate[TSource，TAccumulate]（IEnumerable`1 source，TAccumulate seed，Func`3 Func）
在C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.ResolveExpression（PropertyMap PropertyMap，Type currentType，Expression instanceParameter，LetPropertyMaps LetPropertyMaps）中的AutoMapper.QueryableExtensions.ExpressionBuilder.ResolveExpression（PropertyMap PropertyMap，Type currentType，Expression instanceParameter，LetPropertyMaps
在c:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.c_u中显示Class17_0.g_uCreateMemberBinding | 0（PropertyMap PropertyMap PropertyMap）：第272行
在C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.CreateMemberBindings（ExpressionRequest请求、TypeMap TypeMap、Expression instanceParameter、IDictionary`2 typePairCount、LetPropertyMaps LetPropertyMaps）中的C:\projects\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:第266行
在C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.CreateMapExpressionCore（ExpressionRequest请求，Expression instanceParameter，IDictionary`2 typePairCount，TypeMap TypeMap，LetPropertyMaps LetPropertyMaps）的C:\projects\QueryableExtensions\ExpressionBuilder.cs:第204行
在C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.CreateMapExpression（ExpressionRequest请求，IDictionary`2 typePairCount，LetPropertyMaps LetPropertyMaps）中的AutoMapper.QueryableExtensions.ExpressionBuilder.CreateMapExpression中：第152行
在System.Lazy`1.ViaFactory（LazyThreadSafetyMode模式）
位于System.Lazy`1.ExecutionAndPublication（LazyHelper ExecutionAndPublication，布尔useDefaultConstructor）
在System.Lazy`1.CreateValue（）处
在C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.GetMapExpression（类型sourceType，类型destinationType，对象参数，MemberInfo[]membersToExpand）中的C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:第98行
在C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\ProjectionExpression.cs中的AutoMapper.QueryableExtensions.ProjectionExpression.To[TResult]（对象参数，表达式'1[]membersToExpand）处：第60行
在C:\projects\AutoMapper\src\AutoMapper\QueryableExtensions\Extensions.ProjectTo[tdestinition]（IQueryable源代码，IConfigurationProvider配置，表达式'1[]membersToExpand）中的C:\projects\AutoMapper\QueryableExtensions\Extensions.cs:第76行

我正试图按照这里文档中的描述使用它：

但看起来我在静态与实例设置方面做错了什么。我想使用我与DI一起传递的

IMapper

实例，因为它可以在单个映射上正常工作

如何修复此错误？

我找到了此错误的原因。感谢您提醒我们有关有限公司的信息。我在源代码类型上使用了一个前缀为“Get”的方法，但我认为这不适用于

ProjectTo

。（我认为这属于列表中的最后一项-域对象上的任何计算属性），这就是为什么LINQ给出错误“非静态方法需要非空实例。”
不确定这是否对任何人都有帮助，但别忘了检查反向映射是否也符合AutoMapper支持的选项

我刚刚花了一个小时的时间反复尝试解决这个问题。最后，我注意到/记得我在所有映射的末尾都使用了
ReverseMap（）
，这意味着在映射被反转时违反了大量源到目标的映射规则。
IMapper.ProjectTo
是您需要的。但你似乎发现了一个bug。重做会有帮助的。制定一个我们可以执行并看到失败的计划。但一定要确保你所要做的是ProjectTo。
context.Set<Entity>().ProjectTo<Model>(mapper.ConfigurationProvider);

System.ArgumentException: Static method requires null instance, non-static method requires non-null instance. at System.Linq.Expressions.Expression.ValidateStaticOrInstanceMethod(Expression instance, MethodInfo method) at System.Linq.Expressions.Expression.ValidateMethodAndGetParameters(Expression instance, MethodInfo method) at System.Linq.Expressions.Expression.Call(MethodInfo method, Expression arg0) at AutoMapper.QueryableExtensions.Impl.MemberGetterExpressionResultConverter.ExpressionResolutionResult(ExpressionResolutionResult expressionResolutionResult, MemberInfo getter) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\Impl\MemberGetterExpressionResultConverter.cs:line 24 at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func) at AutoMapper.QueryableExtensions.ExpressionBuilder.ResolveExpression(PropertyMap propertyMap, Type currentType, Expression instanceParameter, LetPropertyMaps letPropertyMaps) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 308 at AutoMapper.QueryableExtensions.ExpressionBuilder.<>c__DisplayClass17_0.<CreateMemberBindings>g__CreateMemberBinding|0(PropertyMap propertyMap) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 272 at AutoMapper.QueryableExtensions.ExpressionBuilder.CreateMemberBindings(ExpressionRequest request, TypeMap typeMap, Expression instanceParameter, IDictionary`2 typePairCount, LetPropertyMaps letPropertyMaps) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 266 at AutoMapper.QueryableExtensions.ExpressionBuilder.CreateMapExpressionCore(ExpressionRequest request, Expression instanceParameter, IDictionary`2 typePairCount, TypeMap typeMap, LetPropertyMaps letPropertyMaps) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 204 at AutoMapper.QueryableExtensions.ExpressionBuilder.CreateMapExpression(ExpressionRequest request, IDictionary`2 typePairCount, LetPropertyMaps letPropertyMaps) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 152 at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode) at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor) at System.Lazy`1.CreateValue() at AutoMapper.QueryableExtensions.ExpressionBuilder.GetMapExpression(Type sourceType, Type destinationType, Object parameters, MemberInfo[] membersToExpand) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ExpressionBuilder.cs:line 98 at AutoMapper.QueryableExtensions.ProjectionExpression.To[TResult](Object parameters, Expression`1[] membersToExpand) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\ProjectionExpression.cs:line 60 at AutoMapper.QueryableExtensions.Extensions.ProjectTo[TDestination](IQueryable source, IConfigurationProvider configuration, Expression`1[] membersToExpand) in C:\projects\automapper\src\AutoMapper\QueryableExtensions\Extensions.cs:line 76