c# - 无法通过 Microsoft Graph API(C# 控制台)发送电子邮件

Question

我按照这两个链接创建了一个控制台应用程序，用于使用 Graph API 发送电子邮件:

https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=csharp

Microsoft Graph API unable to Send Email C# Console

我已在 Azure AD 应用中添加并授予所需的权限:

我确保提供了客户端 ID、租户 ID、客户端密码。

但是，我在运行控制台时看到这个错误:

我错过了什么？

这是我从 Microsoft Graph API unable to Send Email C# Console 中尝试的代码

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 = "myToEmail@gmail.com"
                    }
                }
            },
            CcRecipients = new List<Recipient>()
            {
                new Recipient
                {
                    EmailAddress = new EmailAddress
                    {
                        Address = "myCCEmail@gmail.com"
                    }
                }
            }
        };

        var saveToSentItems = true;

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

        return graphClient;

    }

Answer 1

根据生成 confidentialClientApplication 的代码，您正在使用 Client credentials provider .

但是你发送邮件的方式是:

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

它实际上正在调用 https://graph.microsoft.com/v1.0/me/sendMail。

但客户端凭证流不支持 /me 端点。您应该调用 https://graph.microsoft.com/v1.0/users/{id |在本例中为 userPrincipalName}/sendMail 端点。

所以代码应该是:

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

或者如果你想使用/me/sendMail，选择Authorization code provider ，您应该在其中实现交互式登录。

您可以了解authorization code flow之间的场景和差异和 client credentials flow .