＆＃39; SerializeToStreamAsync＆＃39;在类型＆＃39; System.Net.Http.ObjectContent＆＃39;没有实施

Question

我正在使用.NET Core 1.1 ASP.NET MVC项目，并且在尝试解析来自我的某个API的响应时遇到了以下错误。 根据我的阅读，我应该在我的项目中使用Web API客户端，我就是这样。

这让我发疯了。有什么问题？

  

处理请求时发生未处理的异常。

     

TypeLoadException：Method＆＃39; SerializeToStreamAsync＆＃39;在类型   ＆＃39; System.Net.Http.ObjectContent＆＃39;从装配   ＆＃39; System.Net.Http.Formatting，Version = 5.2.3.0，Culture = neutral，   公钥= 31bf3856ad364e35＆＃39;没有实施。   System.Net.Http.HttpContentExtensions.ReadAsAsync（HttpContent   内容，类型类型，IEnumerable格式化程序，   IFormatterLogger formatterLogger，CancellationToken cancellationToken）

调用代码片段

    public async Task<IEnumerable<Menu>> GetAll()
    {
        List<Menu> result;
        var response = await http.GetAsync("/Menu/GetAll");
        if (response.IsSuccessStatusCode)
            result = await response.Content.ReadAsAsync<List<Menu>>();
        else
            throw new HttpRequestException(response.ReasonPhrase);

        return result;
    }

API片段

    public class MenuRepository
    {
        private readonly MainContext context;
        public MenuRepository(MainContext context)
        {
            this.context = context;
        }

        public IEnumerable<Menu> GetAll()
        {
            var menus = context.Menus
                .Include(m => m.Vendor)
                .AsNoTracking();
            return menus;
        }
    }

csproj MVC应用程序

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
    <PackageTargetFallback>$(PackageTargetFallback);portable-net45+win8+wp8+wpa81;</PackageTargetFallback>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.0.0" />
    <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.3" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.Cookies" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Session" Version="1.1.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.1.1" />
    <PackageReference Include="Microsoft.Identity.Client" Version="1.1.0-preview" />
    <PackageReference Include="Microsoft.AspNetCore" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.3" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.2" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.2" />
    <PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="1.1.2" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="1.1.1" />
    <PackageReference Include="System.Runtime.Serialization.Xml" Version="4.3.0" />
    <PackageReference Include="system.xml.xmlserializer" Version="4.3.*" />
    <PackageReference Include="WinInsider.System.Net.Http.Formatting" Version="1.0.5" />
  </ItemGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.1" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\Alfred.Models\Alfred.Models.csproj" />
  </ItemGroup>

  <ItemGroup>
    <Folder Include="Views\Menu\" />
  </ItemGroup>

</Project>

Answer 1

尝试使用以下语法

public async Task<IActionResult> GetAll() {
    var response = await http.GetAsync("/Menu/GetAll");
    if (response.IsSuccessStatusCode) {
        var result = await response.Content.ReadAsAsync<List<Menu>>();
        return Ok(result);
    } else {
        return StatusCode((int)response.StatusCode);
    }
}