c# - 从SharePoint 365下载文件

string remoteUri = "http://www.contoso.com/library/homepage/images/";
            string fileName = "ms-banner.gif", myStringWebResource = null;
            // Create a new WebClient instance.
            WebClient myWebClient = new WebClient();
            // Concatenate the domain with the Web resource filename.
            myStringWebResource = remoteUri + fileName;
            Console.WriteLine("Downloading File \"{0}\" from \"{1}\" .......\n\n", fileName, myStringWebResource);
            // Download the Web resource and save it into the current filesystem folder.
            myWebClient.DownloadFile(myStringWebResource,fileName);
            Console.WriteLine("Successfully Downloaded File \"{0}\" from \"{1}\"", fileName, myStringWebResource);
            Console.WriteLine("\nDownloaded file saved in the following file system folder:\n\t" + Application.StartupPath);

我使用MSDN Web Site中的代码
但我遇到了一个错误：403禁止
有人能帮我把这个用起来吗？

最佳答案

由于请求未经身份验证，因此发生此错误。为了访问Office/SharePoint Online中的资源，您可以利用SharePointOnlineCredentials class中的SharePoint Server 2013 Client Components SDK（用户凭据流）。
以下示例演示如何从SPO下载文件：

const string username = "[email protected]";
const string password = "password";
const string url = "https://tenant.sharepoint.com/";
var securedPassword = new SecureString();
foreach (var c in password.ToCharArray()) securedPassword.AppendChar(c);
var credentials = new SharePointOnlineCredentials(username, securedPassword);

DownloadFile(url,credentials,"/Shared Documents/Report.xslx");


private static void DownloadFile(string webUrl, ICredentials credentials, string fileRelativeUrl)
{
     using(var client = new WebClient())
     {
        client.Credentials = credentials;
        client.DownloadFile(webUrl, fileRelativeUrl);
     }
}