认证到 SharePoint 在线 C#

Question

I'm trying to connect to SharePoint online in a console App and print the title of the site. Its giving me the error: "The sign-in name or password does not match one in the Microsoft account system." I have checked and made sure the username and password are 100% right. I dont know what else to check Heres my code:

private static void SPCredentialsConnect()
    {
        const string SiteUrl = "https://tenant.sharepoint.com/sites/mysite";
        const string pwd = "appPassword";
        const string username = "username@tenant.onmicrosoft.com";

        SecureString securestring = new SecureString();
        pwd.ToCharArray().ToList().ForEach(s => securestring.AppendChar(s));

        ClientContext context = new ClientContext(SiteUrl);
        context.Credentials = new SharePointOnlineCredentials(username, securestring);

        try
        {
            var web = context.Web;
            context.Load(web);
            context.ExecuteQuery();

            Console.WriteLine($"web title: {web.Title}");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }

Answer 1

Have your issue fixed? “The sign-in name or password does not match one in the Microsoft account system” Error will occur sometimes and fixed after a while with nothing changed.

AppOnly Authentication for sharepointonline can't be registed in Azure Active Directory. It should be register in

https://contoso.sharepoint.com/_layouts/15/appregnew.aspx

And grant permission in

https://contoso-admin.sharepoint.com/_layouts/15/appinv.aspx

You can refer to following document

https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/security-apponly-azureacs

Answer 2

Consider using the PnP.Framework ( a NuGet package ), and use the AuthenticationManager object for SPO sites. This method bypasses MFA (which is mandatory in our organization, FWIW). You can find a lot more information and examples here , including steps on getting the client id and client secret for a site. Here is what we use to log into SPO sites:

using (ClientContext context = 
    new AuthenticationManager().GetACSAppOnlyContext(SiteUrl, clientID, clientSecret)) 
    {
        ...
    }

Also, once you connect, you should adjust the Context.Load to grab the title if you want to use that value right away. Here's what I used in my code:

context.Load(web, p => p.Id, p => p.Title);
context.ExecuteQuery();
Console.WriteLine($"Logged into source {web.Title} ({web.Id})");

Good luck!

Steve in Spain