下载文件从SharePoint 365

Question

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'使用从MSDN Web Site

但我已经越过错误来验证码：403禁止

有人可以帮我把这个工作？

Answer 1

您需要为您的请求添加凭据。
使用SharePoint Online时，您需要添加SharePointOnlineCredentials。

您还可以使用brand new Office 365 API

Answer 2

因为该请求未经过身份验证，则会出现此错误。为了在Ofice365/SharePoint Online中执行身份验证，您可以使用SharePoint Server 2013 Client Components SDK中的SharePointOnlineCredentials class。

下面的例子演示了如何从SPO下载文件：

const string username = "username@tenant.onmicrosoft.com"; 
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 3

我面临同样的问题，并试图通过瓦迪姆Gremyachev建议的答复。但是，它仍然不断给出403错误。我添加了两个额外的头文件，以强制基于表单的身份验证，如下所示：

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

之后开始工作。因此，完整的代码如下所示：

const string username = "username@tenant.onmicrosoft.com"; 
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); 
    } 
}