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); 

我在MSDN网站上使用此代码

但我遇到了错误：403被禁止

有人可以帮助我这个有用吗？

Answer 1

由于请求未经过身份validation，因此会发生此错误。 若要访问Office / SharePoint Online中的资源，您可以使用SharePoint Server 2013客户端组件SDK （ 用户凭据流）中的SharePointOnlineCredentials类 。

以下示例演示了如何从SPO下载文件：

 const string username = "[e-mail]"; 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); } } 

Answer 2

我遇到了同样的问题并尝试了Vadim Gremyachev建议的答案。 但是，它仍然一直给出403错误。 我添加了两个额外的标头来强制进行基于表单的身份验

 client.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f"); client.Headers.Add("User-Agent: Other"); 

在此之后它开始工作。 所以完整的代码如下所示：

 const string username = "[e-mail]"; 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.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f"); client.Headers.Add("User-Agent: Other"); client.Credentials = credentials; client.DownloadFile(webUrl, fileRelativeUrl); } }