我正在为一个谈话创建一个示例：在Xamarin.Android中使用Office 365，但我遇到了一些错误，不知道原因：/
我明白了：
"System.InvalidOperationException: An error occurred while processing this request. --->
Microsoft.OData.Client.DataServiceTransportException: Error: NameResolutionFailure --->
System.Net.WebException: Error: NameResolutionFailure\n
at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n at Microsoft.OData.Client.HttpWebRequestMessage.EndGetResponse (IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n --- End of inner exception stack trace ---\n
at Microsoft.OData.Client.HttpWebRequestMessage.EndGetResponse (IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n at Microsoft.OData.Client.ODataRequestMessageWrapper.EndGetResponse (IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n at Microsoft.OData.Client.DataServiceContext.GetResponseHelper (Microsoft.OData.Client.ODataRequestMessageWrapper request, IAsyncResult asyncResult, Boolean handleWebException) [0x00000]
in <filename unknown>:0 \n --- End of inner exception stack trace ---\n
at Microsoft.OData.Client.BaseAsyncResult.EndExecute[QueryResult] (System.Object source, System.String method, IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n at Microsoft.OData.Client.QueryResult.EndExecuteQuery[Contact] (System.Object source, System.String method, IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n--- End of stack trace from previous location where exception was thrown ---\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 \n
at System.Runtime.CompilerServices.TaskAwaiter`1[Microsoft.Office365.Exchange.Extensions.IPagedEnumerable`1[Microsoft.Office365.Exchange.IContact]].GetResult () [0x00000]
in <filename unknown>:0 \n at Microsoft.Office365.Exchange.Extensions.DataServiceContextWrapper+<ExecuteAsync>d__2d`2[Microsoft.Office365.Exchange.Contact,Microsoft.Office365.Exchange.IContact].MoveNext () [0x00000]
in <filename unknown>:0 \n--- End of stack trace from previous location where exception was thrown ---\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000]
in <filename unknown>:0 \n at System.Runtime.CompilerServices.TaskAwaiter`1[Microsoft.Office365.Exchange.Extensions.IPagedEnumerable`1[Microsoft.Office365.Exchange.IContact]].GetResult () [0x00000] in <filename unknown>:0 \n at Office365InXamarinApps.ViewModel.ContactsViewModel+<GetContacts>d__3.MoveNext () [0x000b5] in d:\\DevApps\\GitHub\\Office365InXamarinApps\\scr\\Office365InXamarinApps\\Office365InXamarinApps\\ViewModel\\ContactsViewModel.cs:44 \n--- End of stack trace from previous location where exception was thrown ---\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000]
in <filename unknown>:0 \n at System.Runtime.CompilerServices.TaskAwaiter`1[System.Collections.Generic.IEnumerable`1[Microsoft.Office365.Exchange.IContact]].GetResult () [0x00000]
in <filename unknown>:0 \n at Office365InXamarinApps.ViewModel.ContactsViewModel+<LoadData>d__0.MoveNext () [0x00030]
in d:\\DevApps\\GitHub\\Office365InXamarinApps\\scr\\Office365InXamarinApps\\Office365InXamarinApps\\ViewModel\\ContactsViewModel.cs:25 " string
和这个
"Microsoft.OData.Core.ODataErrorException: Object reference not set to an instance of an object.
---> Microsoft.OData.Client.DataServiceQueryException: An error occurred while processing this request.
---> Microsoft.OData.Client.DataServiceClientException: {\"error\":{\"code\":\"ErrorInternalServerError\",\"message\":\"Object reference not set to an instance of an object.\",\"innererror\":{\"message\":\"Object reference not set to an instance of an object.\",\"type\":\"System.NullReferenceException\",\"stacktrace\":\"
at Microsoft.Exchange.Services.OData.Model.ContactSchema.<.cctor>b__2c(Entity e, PropertyDefinition ep, ServiceObject s, PropertyInformation sp)\\r\\n
at Microsoft.Exchange.Services.OData.Model.SimpleEwsPropertyProvider.GetProperty(Entity entity, PropertyDefinition property, ServiceObject ewsObject)\\r\\n
at Microsoft.Exchange.Services.OData.Model.ContactProvider.ItemTypeToEntity(ItemType itemType, IList`1 properties)\\r\\n
at Microsoft.Exchange.Services.OData.Model.ContactProvider.Find(String parentFolderId, ContactQueryAdapter queryAdapter)\\r\\n
at Microsoft.Exchange.Services.OData.Model.FindContactsCommand.InternalExecute()\\r\\n
at Microsoft.Exchange.Services.OData.ODataCommand`2.Execute()\\r\\n
at Microsoft.Exchange.Services.OData.ODataTask.Execute(TimeSpan queueAndDelayTime, TimeSpan totalTime)\"}}}\n
at Microsoft.OData.Client.BaseAsyncResult.EndExecute[QueryResult] (System.Object source, System.String method, IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n at Microsoft.OData.Client.QueryResult.EndExecuteQuery[Contact] (System.Object source, System.String method, IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n --- End of inner exception stack trace ---\n
at Microsoft.OData.Client.QueryResult.EndExecuteQuery[Contact] (System.Object source, System.String method, IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n at Microsoft.OData.Client.DataServiceRequest.EndExecute[Contact] (System.Object source, Microsoft.OData.Client.DataServiceContext context, System.String method, IAsyncResult asyncResult) [0x00000]
in <filename unknown>:0 \n--- End of stack trace from previous location where exception was thrown ---\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 \n at System.Runtime.CompilerServices.TaskAwaiter`1[Microsoft.Office365.Exchange.Extensions.IPagedEnumerable`1[Microsoft.Office365.Exchange.IContact]].GetResult () [0x00000] in <filename unknown>:0 \n
at Microsoft.Office365.Exchange.Extensions.DataServiceContextWrapper+<ExecuteAsync>d__2d`2[Microsoft.Office365.Exchange.Contact,Microsoft.Office365.Exchange.IContact].MoveNext () [0x00000] in <filename unknown>:0 \n --- End of inner exception stack trace ---\n
at Microsoft.Office365.Exchange.Extensions.DataServiceContextWrapper+<ExecuteAsync>d__2d`2[Microsoft.Office365.Exchange.Contact,Microsoft.Office365.Exchange.IContact].MoveNext () [0x00000]
in <filename unknown>:0 \n--- End of stack trace from previous location where exception was thrown ---\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 \n at System.Runtime.CompilerServices.TaskAwaiter`1[Microsoft.Office365.Exchange.Extensions.IPagedEnumerable`1[Microsoft.Office365.Exchange.IContact]].GetResult () [0x00000] in <filename unknown>:0 \n
at Office365InXamarinApps.ViewModel.ContactsViewModel+<GetContacts>d__4.MoveNext () [0x000d7] in d:\\DevApps\\GitHub\\Office365InXamarinApps\\scr\\Office365InXamarinApps\\Office365InXamarinApps\\ViewModel\\ContactsViewModel.cs:53 " string
答案 0 :(得分：1)
Office 365 API预览存在问题，我无法使用它，因此我使用Office 365 REST API创建了另一个演示。