无法为访问Office365日历创建Discovery Client对象

Question

我需要将Office 365日历集成到我的应用程序中。 我这样做

    public static string ClientID = SettingsHelper.ClientId;
    public static Uri _returnUri = new Uri(SettingsHelper.RedirectUri);
    public const string CommonAuthority = "https://login.windows.net/Common";
    public const string DiscoveryResourceId = "https://api.office.com/discovery/";

    public static AuthenticationContext _authenticationContext { get; set; }
    private static async Task<string> GetTokenHelperAsync(AuthenticationContext context, string resourceId)
    {
        string accessToken = null;
        AuthenticationResult result = null;
        //result = await context.AcquireTokenAsync(resourceId, ClientID, _returnUri); // This Overload is not available
        result = await context.AcquireTokenAsync(resourceId, new ClientCredential(ClientID, SettingsHelper.AppKey));
        accessToken = result.AccessToken;
        return accessToken;
    }

    public static async Task<OutlookServicesClient> EnsureClientCreatedAsync()
    {
        try
        {
            string authority = CommonAuthority;
            _authenticationContext = new AuthenticationContext(authority);
            DiscoveryClient discoveryClient = new DiscoveryClient(async () => await GetTokenHelperAsync(_authenticationContext, DiscoveryResourceId));
            CapabilityDiscoveryResult result = await discoveryClient.DiscoverCapabilityAsync("Calendar");
            var client = new OutlookServicesClient(result.ServiceEndpointUri, async () => await GetTokenHelperAsync(_authenticationContext, result.ServiceResourceId));
            return client;
        }
        catch (Exception)
        {
            if (_authenticationContext != null && _authenticationContext.TokenCache != null)
                _authenticationContext.TokenCache.Clear();
            return null;
        }
    }

用于创建客户端对象

async void CreateClient()
    {
        OutlookServicesClient client = await NewOffice365Authentication.EnsureClientCreatedAsync();
        var eventsResults = await client.Me.GetCalendarView(DateTimeOffset.Now.Subtract(new TimeSpan(10, 0, 0)), DateTimeOffset.Now.AddHours(10)).ExecuteAsync();
    }

但每次发现客户端创建都会抛出以下错误

{"Exception of type 'Microsoft.Office365.Discovery.DiscoveryFailedException' was thrown."}
ErrorCode : Unauthorized

请帮我创建Discovery客户端对象。

Answer 1

从错误中我猜测您的应用程序未在Azure AD中注册，或者您的客户端ID值无效。