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我遇到了使用Monodroid PCL庫的問題。所有的調用都是工作，除了這一個：PostFileWithRequest錯誤，因爲使用Monodroid PCL
client.PostFileWithRequest<DtoResponse>("createimage", ms, fileName, new Dto{ Id = id});
的錯誤如下：
Object reference not set to an instance of an object at ServiceStack.Pcl.StringEqualityComparer.GetHashCode (System.String obj) [0x00000] in <filename unknown>:0
at System.Collections.Generic.Dictionary`2[System.String,System.Object].get_Item (System.String key) [0x00000] in <filename unknown>:0
at ServiceStack.Pcl.NameObjectCollectionBase.FindFirstMatchedItem (System.String name) [0x00000] in <filename unknown>:0
at ServiceStack.Pcl.NameObjectCollectionBase.BaseGet (System.String name) [0x00000] in <filename unknown>:0
at ServiceStack.Pcl.NameValueCollection.Add (System.String name, System.String value) [0x00000] in <filename unknown>:0
at ServiceStack.Pcl.HttpUtility.ParseQueryString (System.String query, System.Text.Encoding encoding, ServiceStack.Pcl.NameValueCollection result) [0x00000] in <filename unknown>:0
at ServiceStack.Pcl.HttpUtility.ParseQueryString (System.String query, System.Text.Encoding encoding) [0x00000] in <filename unknown>:0
at ServiceStack.Pcl.HttpUtility.ParseQueryString (System.String query) [0x00000] in <filename unknown>:0
at ServiceStack.AndroidPclExportClient.ParseQueryString (System.String query) [0x00000] in <filename unknown>:0
at ServiceStack.ServiceClientBase+<>c__DisplayClass1b`1[Lodestone.Pcl.Infrastucture.Responses.ChildImage.ChildImageResponse].<PostFileWithRequest>b__18() [0x00000] in <filename unknown>:0
at ServiceStack.ServiceClientBase.PostFileWithRequest[ChildImageResponse] (System.String relativeOrAbsoluteUrl, System.IO.Stream fileToUpload, System.String fileName, System.Object request, System.String fieldName) [0x00000] in <filename unknown>:0 "
我們沒有在此之前這個問題。我們使用的是3.9.71 monodroid編譯的dll。它們不是PCL。這隻適用於v4 PCL版本。以前有人遇到過這個問題，你是如何解決這個問題的？