SharePoint Online Credentials

 引用以下两个dll

Microsoft.SharePoint.Client.dll 

Microsoft.SharePoint.Client.Runtime.dll

using (ClientContext clientContext = new ClientContext("https://yoursite.sharepoint.com/"))
{
    SecureString passWord = new SecureString();
    foreach (char c in "yourpassword".ToCharArray()) passWord.AppendChar(c);
    clientContext.Credentials = new SharePointOnlineCredentials("loginname@yoursite.onmicrosoft.com", passWord);
    Web web = clientContext.Web;
    clientContext.Load(web);
    clientContext.ExecuteQuery();
}