如何处理系统。

Question

首先，是C＃＆amp;的新手VB.NET开发。

在尝试连接到Exchange Server时，会收到以下错误。

System.PlatformNotSupportedException
  HResult=0x80131539
  Message=Confidential Client flows are not available on mobile platforms or on Mac.See https://aka.ms/msal-net-confidential-availability for details.
  Source=Microsoft.Identity.Client
  StackTrace:
   at Microsoft.Identity.Client.ConfidentialClientApplicationBuilder.Create(String clientId)
   at DataLoadLibrary.Email.OAuthTokenProviders.<connect_to_exchange>d__1.MoveNext() in C:\Users\path\to\file\OAuthTokenProviders.cs:line 20

我指的是

using System;
using Microsoft.Exchange.WebServices.Data;
using Microsoft.Identity.Client;



namespace DataLoadLibrary.Email
{
    public class OAuthTokenProviders
    {
        public  OAuthTokenProviders()
        {
            Console.WriteLine("TESTING INSIDE CONSTRUCT");
            connect_to_exchange();
        }

        static async void connect_to_exchange()
        {
            // Using Microsoft.Identity.Client
            var cca = ConfidentialClientApplicationBuilder
                .Create("")      //client Id
                .WithClientSecret("")
                .WithTenantId("")
                .Build();
            var ewsScopes = new string[] { "https://outlook.office365.com/.default" };
            try
            {
                // Get token
                var authResult = await cca.AcquireTokenForClient(ewsScopes)
                    .ExecuteAsync();
                // Configure the ExchangeService with the access token
                var ewsClient = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
                ewsClient.Url = new Uri("https://outlook.office365.com/EWS/Exchange.asmx");
                ewsClient.Credentials = new OAuthCredentials(authResult.AccessToken);
                ewsClient.ImpersonatedUserId =
                    new ImpersonatedUserId(ConnectingIdType.SmtpAddress, "[email protected]");
                //Include x-anchormailbox header
                ewsClient.HttpHeaders.Add("X-AnchorMailbox", "[email protected]");
                // Make an EWS call to list folders on exhange online
                var folders = ewsClient.FindFolders(WellKnownFolderName.MsgFolderRoot, new FolderView(10));
                foreach (var folder in folders)
                {
                    Console.WriteLine($"Folder: {folder.DisplayName}");
                }
                // Make an EWS call to read 50 emails (last 5 days) from Inbox folder
                TimeSpan ts = new TimeSpan(-5, 0, 0, 0);
                DateTime date = DateTime.Now.Add(ts);
                SearchFilter.IsGreaterThanOrEqualTo filter = new SearchFilter.IsGreaterThanOrEqualTo(ItemSchema.DateTimeReceived, date);
                var findResults = ewsClient.FindItems(WellKnownFolderName.Inbox, filter, new ItemView(50));
                foreach (var mailItem in findResults)
                {
                    Console.WriteLine($"Subject: {mailItem.Subject}");
                }
                EmailMessage email = new EmailMessage(ewsClient);
                email.ToRecipients.Add("[email protected]");
                email.Subject = "HelloWorld";
                email.Body = new MessageBody("This is a test email using MS Exchg we services");
                email.Send();
            }
            catch (MsalException ex)
            {
                Console.WriteLine($"Error acquiring access token: {ex}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex}");
            }
            if (System.Diagnostics.Debugger.IsAttached)
            {
                Console.WriteLine("Hit any key to exit...");
                Console.ReadKey();
            }
        }
    }
}

当我在vs Studio中执行上述代码时，要 开发相同的信息移动平台或Mac上的流量不可用。参见 https://aka.ms/msal-net-net-net-net-net-confidential-avialdial-availability 有关详细信息 。请证明一些暗示为什么它会显示出这种例外以及我们如何处理它。提前致谢。