.NET核心项目中缺少System.Runtime.Serialization

在我的ASP.NETMVC核心项目中，我有一个应该返回json的控制器

public class EnvironmentsController : Controller
{
    [Route("/environments")]
    [HttpGet]
    public JsonResult GetEnvironments()
    {
        var envs = Enumerable.Empty<EnvironmentDescription>();

        return this.Json(envs.ToArray());
    }
}

公共类环境控制器：控制器
{
[路由（“/environments”）]
[HttpGet]
公共JsonResult GetEnvironments（）
{
var envs=Enumerable.Empty（）；
返回this.Json（envs.ToArray（））；
}
}

当我在前端或直接从浏览器调用时，我从控制器收到以下错误消息：

System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. The system cannot find the file specified.
File name: 'System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
   at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
   at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
   at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
   at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
   at System.Attribute.GetCustomAttributes(MemberInfo element, Boolean inherit)
   at Newtonsoft.Json.Utilities.ReflectionUtils.GetAttributes(Object provider, Type attributeType, Boolean inherit)
   at Newtonsoft.Json.Serialization.JsonTypeReflector.GetAssociateMetadataTypeFromAttribute(Type type)
   at Newtonsoft.Json.Utilities.ThreadSafeStore`2.AddValue(TKey key)
   at Newtonsoft.Json.Serialization.JsonTypeReflector.GetAttribute[T](Type type)
   at Newtonsoft.Json.Utilities.ThreadSafeStore`2.AddValue(TKey key)
   at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateContract(Type objectType)
   at Newtonsoft.Json.Serialization.DefaultContractResolver.ResolveContract(Type type)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.WriteStartArray(JsonWriter writer, Object values, JsonArrayContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IEnumerable values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
   at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
   at Microsoft.AspNetCore.Mvc.Formatters.Json.Internal.JsonResultExecutor.ExecuteAsync(ActionContext context, JsonResult result)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeResultAsync>d__30.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextResultFilterAsync>d__28.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResultExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextResourceFilter>d__22.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAsync>d__20.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.SpaServices.Webpack.ConditionalProxyMiddleware.<Invoke>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.SpaServices.Webpack.ConditionalProxyMiddleware.<Invoke>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__7.MoveNext()

System.IO.FileNotFoundException:无法加载文件或程序集'System.Runtime.Serialization，版本=4.0.0.0，区域性=中性，PublicKeyToken=b77a5c561934e089'。系统找不到指定的文件。
文件名：“System.Runtime.Serialization，Version=4.0.0.0，Culture=neutral，PublicKeyToken=b77a561934e089”
在System.ModuleHandle.ResolveType（运行时模块模块、Int32 typeToken、IntPtr*typeInstArgs、Int32 typeInstCount、IntPtr*methodInstArgs、Int32 methodInstCount、ObjectHandleOnStack类型）
位于System.ModuleHandle.ResolveTypeHandleInternal（RuntimeModule模块、Int32 typeToken、RuntimeTypeHandle[]TypeInstanceContext、RuntimeTypeHandle[]MethodInstanceContext）
位于System.Reflection.RuntimeModule.ResolveType（Int32 metadataToken，类型[]genericTypeArguments，类型[]genericMethodArguments）
在System.Reflection.CustomAttribute.FilterCustomAttributeRecord（CustomAttributeRecord caRecord，MetadataImport作用域，Assembly&LastAptCookAssembly，RuntimeModule decoratedModule，MetadataToken decoratedToken，RuntimeType attributeFilterType，Boolean必须不可编辑，Object[]属性、IList-derivedAttributes、RuntimeType和attributeType、IRontimeMethodInfo和ctor、Boolean和ctorHasParameters、Boolean和isVarArg）
位于System.Reflection.CustomAttribute.GetCustomAttributes（RuntimeModule decoratedModule、Int32 decoratedMetadataToken、Int32 pcaCount、RuntimeType attributeFilterType、Boolean mustBeInheritable、IList derivedAttributes、Boolean isDecoratedTargetSecurityTransparent）
位于System.Reflection.CustomAttribute.GetCustomAttributes（RuntimeType类型、RuntimeType类型、布尔继承）
位于System.Attribute.GetCustomAttributes（MemberInfo元素，布尔继承）
位于Newtonsoft.Json.Utilities.ReflectionUtils.GetAttributes（对象提供程序，类型attributeType，布尔继承）
位于Newtonsoft.Json.Serialization.jsontyperelector.GetAssociateMetadataTypeFromAttribute（类型）
位于Newtonsoft.Json.Utilities.ThreadSafeStore`2.AddValue（TKey）
位于Newtonsoft.Json.Serialization.jsontyperelector.GetAttribute[T]（类型）
位于Newtonsoft.Json.Utilities.ThreadSafeStore`2.AddValue（TKey）
位于Newtonsoft.Json.Serialization.DefaultContractResolver.CreateContract（类型objectType）
位于Newtonsoft.Json.Serialization.DefaultContractResolver.ResolveContract（类型）
位于Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.WriteStarray（JsonWriter编写器、对象值、JsonArrayContract契约、JsonProperty成员、JsonContainerContract容器契约、JsonProperty容器属性）
位于Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializationList（JsonWriter编写器、IEnumerable值、JsonArrayContract契约、JsonProperty成员、JsonContainerContract集合契约、JsonProperty容器属性）
位于Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.serializate（JsonWriter JsonWriter，对象值，类型objectType）
位于Newtonsoft.Json.JsonSerializer.SerializeInternal（JsonWriter JsonWriter，对象值，类型objectType）
位于Microsoft.AspNetCore.Mvc.Formatters.Json.Internal.JsonResultExecutor.ExecuteAsync（ActionContext上下文，JsonResult）
在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d_u30.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d_u28.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
位于Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow（ResultExecutedContext上下文）
位于Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next（状态和下一步、范围和范围、对象和状态、布尔值和isCompleted）
在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d_u22.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
位于Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow（ResourceExecutedContext上下文）
位于Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next（状态和下一步、范围和范围、对象和状态、布尔值和isCompleted）
在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.d_u20.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.Builder.RouterMiddleware.d_u4.MoveNext（）上
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.AspNetCore.SpaServices.Webpack.ConditionalProxyMiddleware.d_u6.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
位于Microsoft.AspNetCore.SpaServices.Webpack.ConditionalProxy