Question

以前，我开发了一个应用程序，可以从公司的Sharepoint网站下载文件，然后对其进行一些魔术操作。

自从迁移到MS Teams之后，我已经拥有了强大的功能，我正在尝试更新该应用程序以使用新平台。但是，下载文件时遇到各种问题。

我以前使用的代码（用于Sharepoint）使用WebClient根据用户先前提供的凭据检索文件：

    private string GetSchedule(string username, string password, string domain)
    {

        string tempPath = Path.GetTempFileName().Replace(".tmp", ".xlsm");
        using (WebClient client = new WebClient())
        {
            client.Credentials = new NetworkCredential(username, password, domain);
            try
            {
                client.DownloadFile(_networkSchedulePath, tempPath);
            }
            catch (WebException e)
            {
                if (e.Message.Contains("401"))
                {
                    StatusUpdated?.Invoke(this, new EventArgs<string>("Invalid Credentials Provided"));
                    Finished?.Invoke(this, null);
                    return null;
                }
                if (e.Message.Contains("404"))
                {
                    StatusUpdated?.Invoke(this, new EventArgs<string>("File Not Found"));
                    Finished?.Invoke(this, null);
                    return null;
                }
                else
                {
                    StatusUpdated?.Invoke(this, new EventArgs<string>(e.Message));
                    Finished?.Invoke(this, null);
                    return null;
                }
            }
        }
        return tempPath;
    }

但是，当我在新团队链接中使用它时，出现了403 Forbidden错误。那么有什么方法可以以编程方式从MS Teams检索文件？

Answer 1

感谢JLRishe的帮助，他提供了答案和评论。但是，最终的解决方案与他的回答不同，这就是为什么我将其发布在这里的原因：

public void Main() { // Generate 100 items and 'process' async Observable .Range(0, 100) .Select(x => ProcessItemAsync(x)) .Concat() .Dump(); } private readonly Random _rnd = new Random(); public async Task<int> ProcessItemAsync(int item) { await Task.Delay(_rnd.Next(0, 1000)); return item; }软件包已广泛用于此目的。

首先，根据需要访问的特定共享点站点，使用OfficeDevPnP.Core获取AuthenticationManager。这将弹出一个窗口以允许使用MFA。然后，通过ClientContext对象加载各种组件。从这里，文件通过ClientContext提取并转储到磁盘。

Guid

Answer 2

using Microsoft.Graph;
using Microsoft.Graph.Auth;
using Microsoft.Identity.Client;
using System.IO;
using System.Linq;

namespace Answer
{
    class Answer
    {
        static void Main(string[] args)
        {
            // Create Confidential Application
            IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
                .Create("<My_Azure_Application_Client_ID>")
                .WithTenantId("<My_Azure_Tenant_ID>")
                .WithClientSecret("<My_Azure_Application_Client_Secret>")
                .Build();

            // Create an authentication provider.
            ClientCredentialProvider authenticationProvider = new ClientCredentialProvider(confidentialClientApplication);
            // Configure GraphServiceClient with provider.
            GraphServiceClient graphServiceClient = new GraphServiceClient(authenticationProvider);

            // Get a user
            var user = graphServiceClient.Users["<My_Azure_User_Name>"].Request().GetAsync().Result;
            
            // Get the teams the user is member of
            var joinedTeams = graphServiceClient.Users[user.Id].JoinedTeams.Request().GetAsync().Result;

            // Get the team we are intereseted in
            var team1 = joinedTeams.FirstOrDefault(t => t.DisplayName == "<TeamName_Of_Interest>");

            // Get the main folders
            var folders = graphServiceClient.Groups[team1.Id].Drive.Root.Children
                .Request()
                .GetAsync().Result;

            // Get the files in the first main folder
            var files = graphServiceClient.Groups[team1.Id].Drive.Items[folders[0].Id].Children
                .Request()
                .GetAsync().Result;

            // Get the file-Data of the first file
            MemoryStream fileData = graphServiceClient.Groups[team1.Id].Drive.Items[files[0].Id].Content
                .Request()
                .GetAsync().Result as MemoryStream;

            // Save the file to the hard-disc
            System.IO.File.WriteAllBytes($"C:\\{files[0].Name}", fileData.ToArray());
        }
    }
}

以编程方式从MS团队下载文件

2 个答案: