Using SPUser in SharePoint

SharePoint Object Model using SPUser Class

SPUser is actually derived from SPPrinciple, SPUser is main base class which allows in extending its functionality by exposing its member and different properties.SharePoint object model has provided the provision to add the user programatically to sharepoint group or  permissions to user to a list,and it is possible to update the user information or fetch the user information.

The following sample code shows about how to display user permission is he in admin group or normal user

also it has the code to update the user information or giving the permission to a list

WebPart

using System;

using System.ComponentModel;

using System.Web;

using System.Data;

using System.Text;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using Microsoft.SharePoint;

using Microsoft.SharePoint.WebControls;

namespace SPUserDemo

{

    [ToolboxItemAttribute(false)]

    public class SPUserDemoWebPart: WebPart

    {

protected override void CreateChildControls()

        {

         }

protected override void RenderContents(HtmlTextWriter writer)

{

//Get the user  information

  GetUser(writer)

}

private void GetUser(HtmlTextWriter writer)

{

SPUser SPuser = SPContext.Current.Web.CurrentUser;

if(SPuser.IsSiteAdmin)

writer.Write("<p>Ohh you are Super  admin user'</p>");

else

writer.Write("<p>No you are a normal user </p>");

}

}

}

 //Add  permissions to SharePoint list

Private void AddNewUser()

{

               const string listUsers = @"Users ";

               SPList  Users= null;

                SPSecurity.RunWithElevatedPrivileges(

            delegate {

                          using (SPSite spSsite= new SPSite(“http://sitedemo”)) {

                                     using (SPWeb  spWeb= spSsite.OpenWeb) {

                                                spWeb.AllowUnsafeUpdates = true;

                                              Guid listGuidID = spWeb.Lists.Add listUsers,

                                             "Members", SPListTemplateType.GenericList);

                                              Users = spWeb.Lists[listGuidID];

                                             Users.Fields.Add("User", SPFieldType.User, true);

                                            Users.WriteSecurity = 4;

                                            Users.Update();

                                            spWeb.Update();

                                                                                                      }

                                                                                           }

                         });

}

                   //update user email information

                         using (SPSite spSsite=new SPSite(“http://sitedemo”)) {

                              using (SPWeb  spWeb= spSsite.OpenWeb) {

                                        SPUser spUser = spWeb.AllUsers["ABCUser"];

                                              spUser.Email = " E-mail_Address";

                                                  spUser.Update();

                                                                                                 }

                                                                                                         }