使用WebClient从SharePoint Online下载文件
使用WebClient从SharePoint Online下载文件
提问于 2020-10-07 23:40:08
我正在使用.net 4.8 WebClient和Microsoft.SharePointOnline.CSOM包，尝试从SharePoint online下载文件。
const string username = "myusername@domain.com";
const string password = "mypassword";
const string url = "https://tenant.sharepoint.com/:b:/r/filepath.pdf";
var securedPassword = new SecureString();
foreach (var c in password.ToCharArray())
{
securedPassword.AppendChar(c);
}
var credentials = new SharePointOnlineCredentials(username, securedPassword);
using (var client = new WebClient())
{
client.Credentials = credentials;
client.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f");
client.DownloadFile(url, "C:\\temp\\test.pdf"); //this file path definitely exists
}我得到的错误是401未授权。我使用相同的凭据注销并登录到SharePoint环境，以确保它们是正确的。
我已经尝试在头文件中添加几个不同的用户代理，看看这是否有帮助。
client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
//or
client.Headers.Add("User-Agent: Other");但这并没有什么不同。
这类似于Download File From SharePoint 365，它使用的代码看起来与我相同，但Download Document from SharePoint Online using c# webclient stopped working表示，某些方面发生了变化，这种形式的身份验证不再适用于连接到SharePoint online。然而，我找不到任何关于我们现在应该使用什么的最新文档。
回答 1
Stack Overflow用户
发布于 2020-10-08 11:17:26
你可以参考官方文档提供的代码。
https://docs.microsoft.com/en-us/sharepoint/dev/sp-add-ins/working-with-folders-and-files-with-rest
在我测试的时候，它工作得很好。
public static void DownloadFileViaRestAPI(string webUrl, ICredentials credentials, string documentLibName, string fileName, string path)
{
webUrl = webUrl.EndsWith("/") ? webUrl.Substring(0, webUrl.Length - 1) : webUrl;
string webRelativeUrl = null;
if (webUrl.Split('/').Length > 3)
{
webRelativeUrl = "/" + webUrl.Split(new char[] { '/' }, 4)[3];
}
else
{
webRelativeUrl = "";
}
using (WebClient client = new WebClient())
{
client.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f");
client.Credentials = credentials;
Uri endpointUri = new Uri(webUrl + "/_api/web/GetFileByServerRelativeUrl('" + webRelativeUrl + "/" + documentLibName + "/" + fileName + "')/$value");
byte[] data = client.DownloadData(endpointUri);
FileStream outputStream = new FileStream(path + fileName, FileMode.OpenOrCreate | FileMode.Append, FileAccess.Write, FileShare.None);
outputStream.Write(data, 0, data.Length);
outputStream.Flush(true);
outputStream.Close();
}
}
static void Main(string[] args)
{
string siteURL = "https://contoso.sharepoint.com/sites/dev";
//set credential of SharePoint online
SecureString secureString = new SecureString();
foreach (char c in "password".ToCharArray())
{
secureString.AppendChar(c);
}
ICredentials credentials = new Microsoft.SharePoint.Client.SharePointOnlineCredentials("amos@contoso.onmicrosoft.com", secureString);
//set credential of SharePoint 2013(On-Premises)
//string userName = "Administrator";
//string password = "xxxxxxx";
//string domain = "CONTOSO";
//ICredentials credentials = new NetworkCredential(userName, password, domain);
DownloadFileViaRestAPI(siteURL, credentials, "lib", "test.css", "c:\\SPFX\\");
Console.WriteLine("success");
Console.ReadLine();
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/64247545
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