无法通过Microsoft Graph API(C#控制台）发送电子邮件

Question

我按照这2个链接创建了一个使用Graph API发送电子邮件的控制台应用程序：

https://docs.microsoft.com/en-us/graph/api/user-Sendmail？view=graph-rest-1.0&tabs=Csharp

Microsoft Graph API无法发送电子邮件C#控制台

static void Main(string[] args)
    {
        // Azure AD APP
        string clientId = "<client Key Here>";
        string tenantID = "<tenant key here>";
        string clientSecret = "<client secret here>";

        Task<GraphServiceClient> callTask = Task.Run(() => SendEmail(clientId, tenantID, clientSecret));
        // Wait for it to finish
        callTask.Wait();
        // Get the result
        var astr = callTask;
    }

    public static async Task<GraphServiceClient> SendEmail(string clientId, string tenantID, string clientSecret)
    {

        var confidentialClientApplication = ConfidentialClientApplicationBuilder
            .Create(clientId)
            .WithTenantId(tenantID)
            .WithClientSecret(clientSecret)
            .Build();

        var authProvider = new ClientCredentialProvider(confidentialClientApplication);       

        var graphClient = new GraphServiceClient(authProvider);

        var message = new Message
        {
            Subject = "Meet for lunch?",
            Body = new ItemBody
            {
                ContentType = BodyType.Text,
                Content = "The new cafeteria is open."
            },
            ToRecipients = new List<Recipient>()
            {
                new Recipient
                {
                    EmailAddress = new EmailAddress
                    {
                        Address = "[e-mail]"
                    }
                }
            },
            CcRecipients = new List<Recipient>()
            {
                new Recipient
                {
                    EmailAddress = new EmailAddress
                    {
                        Address = "[e-mail]"
                    }
                }
            }
        };

        var saveToSentItems = true;

          await graphClient.Me
            .SendMail(message, saveToSentItems)
            .Request()
            .PostAsync();

        return graphClient;

    }

Answer 1

基于生成ConfidentialClientApplication的代码，您正在使用客户端凭据提供程序。

但你发送邮件的方式是：

await graphClient.Me
.SendMail(message, saveToSentItems)
.Request()
.PostAsync()

它实际上是在调用https://graph.microsoft.com/v1.0/me/sendmail。

await graphClient.Users["{id or userPrincipalName}"]
    .SendMail(message, saveToSentItems)
    .Request()
    .PostAsync();

或者如果要使用/me/sendmail，请选择“授权代码提供程序”，您应该在其中实现交互式登录。

您可以了解授权代码流和客户端凭据流之间的场景和差异。