英文:
Object reference not set to an object while accessing Microsoft's Teams through .Net
问题
在以下代码中，当控制尝试执行GetAsync()请求时，我遇到了空引用异常。
public static async Task<DialogTurnResult> OnBehalfOf(WaterfallStepContext stepContext, CancellationToken cancellationToken){try{IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder.Create(clientId).WithRedirectUri(redirectUri).WithClientSecret(clientSecret).Build();OnBehalfOfProvider authProvider = new OnBehalfOfProvider(confidentialClientApplication, scopes);HttpProviderTeamsAccess temp = new HttpProviderTeamsAccess();GraphServiceClient graphClient = new GraphServiceClient(authProvider);var usr = await graphClient.Me.Request().GetAsync();var a = usr;//var reply_User_Name = MessageFactory.Text(user.DisplayName.ToString());//await stepContext.Context.SendActivityAsync(reply_User_Name, cancellationToken);}catch (Exception ex){var reply_User_Name = MessageFactory.Text(ex.Message.ToString());await stepContext.Context.SendActivityAsync(reply_User_Name, cancellationToken);}return null;}
英文:
In the following code I'm getting a null reference exception when the control tries to execute the GetAsync() request.
public static async Task<DialogTurnResult> OnBehalfOf(WaterfallStepContext stepContext, CancellationToken cancellationToken){try{IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder.Create(clientId).WithRedirectUri(redirectUri).WithClientSecret(clientSecret).Build();OnBehalfOfProvider authProvider = new OnBehalfOfProvider(confidentialClientApplication, scopes);HttpProviderTeamsAccess temp = new HttpProviderTeamsAccess();GraphServiceClient graphClient = new GraphServiceClient(authProvider);var usr = await graphClient.Me.Request().GetAsync();var a = usr;//var reply_User_Name = MessageFactory.Text(user.DisplayName.ToString());//await stepContext.Context.SendActivityAsync(reply_User_Name, cancellationToken);}catch (Exception ex){var reply_User_Name = MessageFactory.Text(ex.Message.ToString());await stepContext.Context.SendActivityAsync(reply_User_Name, cancellationToken);}return null;}
答案1
得分: 1
使用OnBehalfOfProvider时，您必须指明您代表哪个用户进行调用。
var usr = await graphClient.Me.Request().WithUserAssertion(<来自传入授权头的Bearer令牌>).GetAsync();
英文:
When using the OnBehalfOfProvider you have to say which user you are making the call on behalf of.
var usr = await graphClient.Me.Request().WithUserAssertion(<bearer token from incoming auth header>).GetAsync();
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