錯誤CS0103：名稱“ HttpClientFactory”在當前上下文中不存在

Question

我正在嘗試構建此api_query https://github.com/CryptopiaNZ/CryptopiaApi-Csharp.git

$ uname -a
Linux kali 4.0.0-kali1-amd64 #1 SMP Debian 4.0.4-1+kali2 (2015-06-03) x86_64 GNU/Linux

用單聲道構建：

$ xbuild --version
XBuild Engine Version 12.0
Mono, Version 3.2.8.0
Copyright (C) 2005-2013 Various Mono authors

並嘗試構建該項目：

$ xbuild CryptopiaApi.csproj
XBuild Engine Version 12.0
Mono, Version 3.2.8.0
Copyright (C) 2005-2013 Various Mono authors

Build started 08.09.2015 16:13:55.
__________________________________________________
Project "/usr/src/cryptopia/CryptopiaApi-Csharp/CryptopiaApi/CryptopiaApi/CryptopiaApi/CryptopiaApi.csproj" (default target(s)):
        Target PrepareForBuild:
                Configuration: Debug Platform: AnyCPU
        Target GenerateSatelliteAssemblies:
        No input files were specified for target GenerateSatelliteAssemblies, skipping.
        Target GenerateTargetFrameworkMonikerAttribute:
        Skipping target "GenerateTargetFrameworkMonikerAttribute" because its outputs are up-to-date.
        Target CoreCompile:
                Tool /usr/bin/mcs execution started with arguments: /noconfig /debug:full /debug+ /optimize- /out:obj/Debug/CryptopiaApi.dll CryptopiaPrivateAPI.cs CryptopiaPublicAPI.cs DataObjects/Private/BalanceRequest.cs DataObjects/Private/BalanceResponse.cs DataObjects/Private/CancelTradeRequest.cs DataObjects/Private/CancelTradeResponse.cs DataObjects/Private/DepositAddressRequest.cs DataObjects/Private/DepositAddressResponse.cs DataObjects/Private/OpenOrdersRequest.cs DataObjects/Private/OpenOrdersResponse.cs DataObjects/Private/SubmitTipRequest.cs DataObjects/Private/SubmitTipResponse.cs DataObjects/Private/SubmitTradeRequest.cs DataObjects/Private/SubmitTradeResponse.cs DataObjects/Private/TradeHistoryRequest.cs DataObjects/Private/TradeHistoryResponse.cs DataObjects/Private/TransactionRequest.cs DataObjects/Private/TransactionResponse.cs DataObjects/Public/CurrenciesResponse.cs DataObjects/Public/MarketHistoryRequest.cs DataObjects/Public/MarketHistoryResponse.cs DataObjects/Public/MarketOrdersRequest.cs DataObjects/Public/MarketOrdersResponse.cs DataObjects/Public/MarketRequest.cs DataObjects/Public/MarketResponse.cs DataObjects/Public/MarketsRequest.cs DataObjects/Public/MarketsResponse.cs DataObjects/Public/TradePairsResponse.cs Implementation/AuthDelegatingHandler.cs Implementation/ICryptopiaApiPrivate.cs Implementation/ICryptopiaApiPublic.cs Implementation/IRequest.cs Implementation/IResponse.cs Implementation/PrivateApiCall.cs Implementation/PublicApiCall.cs Models/BalanceResult.cs Models/CurrencyResult.cs Models/MarketHistoryResult.cs Models/MarketOrderResult.cs Models/MarketOrdersResult.cs Models/MarketResult.cs Models/OpenOrderResult.cs Models/TradeHistoryResult.cs Models/TradePairResult.cs Models/TransactionResult.cs Properties/AssemblyInfo.cs /target:library /define:"DEBUG;TRACE" /reference:../packages/Newtonsoft.Json.7.0.1/lib/net45/Newtonsoft.Json.dll /reference:/usr/lib/mono/4.5/System.dll /reference:/usr/lib/mono/4.5/System.Net.dll /reference:/usr/lib/mono/4.5/System.Net.Http.dll /reference:/usr/lib/mono/4.5/System.Net.Http.Formatting.dll /reference:/usr/lib/mono/4.5/System.Web.dll /reference:/usr/lib/mono/4.5/System.Xml.Linq.dll /reference:/usr/lib/mono/4.5/System.Data.DataSetExtensions.dll /reference:/usr/lib/mono/4.5/Microsoft.CSharp.dll /reference:/usr/lib/mono/4.5/System.Data.dll /reference:/usr/lib/mono/4.5/System.Xml.dll /reference:/usr/lib/mono/4.5/System.Core.dll /warn:4
CryptopiaPrivateAPI.cs(23,14): error CS0103: The name `HttpClientFactory' does not exist in the current context
CryptopiaPublicAPI.cs(22,14): error CS0103: The name `HttpClientFactory' does not exist in the current context
CryptopiaPublicAPI.cs(70,11): error CS0433: The imported type `Newtonsoft.Json.Linq.JObject' is defined multiple times
                /usr/src/cryptopia/CryptopiaApi-Csharp/CryptopiaApi/CryptopiaApi/CryptopiaApi/../packages/Newtonsoft.Json.7.0.1/lib/net45/Newtonsoft.Json.dll (Location of the symbol related to previous error)
                /usr/lib/mono/4.5/System.Net.Http.Formatting.dll (Location of the symbol related to previous error)
        Task "Csc" execution -- FAILED
        Done building target "CoreCompile" in project "/usr/src/cryptopia/CryptopiaApi-Csharp/CryptopiaApi/CryptopiaApi/CryptopiaApi/CryptopiaApi.csproj".-- FAILED
Done building project "/usr/src/cryptopia/CryptopiaApi-Csharp/CryptopiaApi/CryptopiaApi/CryptopiaApi/CryptopiaApi.csproj".-- FAILED

Build FAILED.
Errors:

/usr/src/cryptopia/CryptopiaApi-Csharp/CryptopiaApi/CryptopiaApi/CryptopiaApi/CryptopiaApi.csproj (default targets) ->
/usr/lib/mono/4.5/Microsoft.CSharp.targets (CoreCompile target) ->

        CryptopiaPrivateAPI.cs(23,14): error CS0103: The name `HttpClientFactory' does not exist in the current context
        CryptopiaPublicAPI.cs(22,14): error CS0103: The name `HttpClientFactory' does not exist in the current context
        CryptopiaPublicAPI.cs(70,11): error CS0433: The imported type `Newtonsoft.Json.Linq.JObject' is defined multiple times

         0 Warning(s)
         3 Error(s)

Time Elapsed 00:00:00.9231760

此錯誤是什么意思：“錯誤CS0103：名稱'HttpClientFactory'在當前上下文中不存在”？

正如我可以在Google上看到的那樣， HttpClientFactory是包含的命名空間System.Net.Http的一部分。 幾乎所有的libmono-都安裝在我的系統上。

編輯：此外，我已經安裝了Microsoft Visual Studio社區2015 14.0.23107.0 D14REL，最新版本和錯誤是相同的。

Edit2：大概，我找到了解決方案。 它是Visual Studio 2013，而不是2015。我不知道它將是哪種單聲道，可能是降級可能有助於構建HttpClientFactory ...

Answer 1

將Nuget包Microsoft.AspNet.WebApi.Client降級到v5.2.2。 對我有用。