c# - 如何从窗口登录凭据中单独获取用户 ID

Question

我正在尝试使用 C# 代码获取用户 ID，如下所示：

string username = System.Web.HttpContext.Current.User.Identity.Name;

我得到这样的用户名和凭据

用户名：“ACSIND\11111111”

这里的用户 ID 是 '11111111'

但我无法从代码中单独获取用户 ID。

我在 VB 中完成了如下操作：

   Option Compare Database
   Option Explicit
   Private Declare Function GetUserName Lib "ADVAPI32.dll" Alias "GetUserNameA" _
   (ByVal lpBuffer As String, nSize As Long) As Long

    Public Function GetCurrentUserName() As String
   On Error GoTo Err_GetCurrentUserName
    Dim lpBuff As String * 25
    Dim ret As Long, Username As String
   ret = GetUserName(lpBuff, 25)
   Username = Left(lpBuff, InStr(lpBuff, Chr(0)) - 1)
  GetCurrentUserName = Username & ""

   Exit_GetCurrentUserName:
   Exit Function

    Err_GetCurrentUserName:
    MsgBox Err.Description
    Resume Exit_GetCurrentUserName
    End Function

请帮助如何在 C# 中单独获取 userId