C#获取本机所有用户名

using System.DirectoryServices;

using System.Runtime.InteropServices;

（需要添加引用）

 

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]

        public struct USER_INFO_0

        {

            public string Username;

        }

        [DllImport("Netapi32.dll ")]

        extern static int NetUserEnum(

                [MarshalAs(UnmanagedType.LPWStr)]   

        string servername,

                int level,

                int filter,

                out   IntPtr bufptr,

                int prefmaxlen,

                out   int entriesread,

                out   int totalentries,

                out   int resume_handle);



        [DllImport("Netapi32.dll ")]

        extern static int NetApiBufferFree(IntPtr Buffer);



        public string[] GetSysUserNames()

        {

            int EntriesRead;

            int TotalEntries;

            int Resume;

            IntPtr bufPtr;

            List<string> temp = new List<string>();



            NetUserEnum(null, 0, 2, out   bufPtr, -1, out   EntriesRead,

                    out   TotalEntries, out   Resume);

            if (EntriesRead > 0)

            {

                USER_INFO_0[] Users = new USER_INFO_0[EntriesRead];

                IntPtr iter = bufPtr;

                for (int i = 0; i < EntriesRead; i++)

                {

                    Users[i] = (USER_INFO_0)Marshal.PtrToStructure(iter,

                            typeof(USER_INFO_0));

                    iter = (IntPtr)((int)iter + Marshal.SizeOf(typeof(USER_INFO_0)));

                    temp.Add(Users[i].Username);

                }

                NetApiBufferFree(bufPtr);

            }

            return temp.ToArray();

        }