在 Xamarin.Android 中使用 Office 365 API

Question

我正在为演讲创建一个示例：在 Xamarin.Android 中使用 Office 365，但我遇到了一些错误，不知道为什么：/

我知道了：

"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

还有这个

"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

代码在这里： https://github.com/saramgsilva/Office365InXamarinApp

Answer 1

Office 365 API Preview 有问题，我无法使用它，因此我使用 Office 365 REST API 创建了另一个演示。

https://github.com/saramgsilva/Office365RESTAPISample