如何通过AAD验证Azure服务管理请求

我试了三种方法都没有结果:

1. 根据本文https://msdn.microsoft.com/en-us/library/azure/ee460782.aspx，我已经在AAD中注册了新的web应用程序，具有访问Azure服务管理API的权限(步骤1-9)，并编写了推荐的两行代码来获取令牌:

    var context = new AuthenticationContext($"https://login.windows.net/{tenantId}");
    var result = context.AcquireToken("https://management.core.windows.net/", clientId, new Uri(redirectUri));

，但是它失败了，并且出现了异常:

Microsoft.IdentityModel.Clients.ActiveDirectory.AdalServiceException was unhandled
Message: An unhandled exception of type 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalServiceException' occurred in Microsoft.IdentityModel.Clients.ActiveDirectory.dll
Additional information: AADSTS90014: The request body must contain the following parameter: 'client_secret or client_assertion'.
Trace ID: aa2d6962-5aea-4f8e-bed4-9e83c7631887
Correlation ID: f7f1a61e-1720-4243-96fa-cff182150931

    var context = new AuthenticationContext($"https://login.windows.net/{tenantId}");
    var result = context.AcquireToken("https://management.core.windows.net/", new ClientCredential(clientId, clientSecret));

    var context = new AuthenticationContext(string.Format("https://login.windows.net/{0}", tenantId));
    // TODO: Replace with your Azure AD user credentials (i.e. admin@contoso.onmicrosoft.com)
    string user = "{YOUR-USERID]";
    string pwd = "{YOUR-USER-PASSWORD}";
    var userCred = new UserCredential(user, pwd);
    AuthenticationResult result =
    await context.AcquireTokenAsync("https://management.core.windows.net/", clientId, userCred);