typedef struct _RAS_CONNECTION_2 {
  HANDLE                hConnection;
  WCHAR                 wszUserName[UNLEN + 1];
  ROUTER_INTERFACE_TYPE dwInterfaceType;
  GUID                  guid;
  PPP_INFO_2            PppInfo2;
} RAS_CONNECTION_2, *PRAS_CONNECTION_2;

typedef struct _PPP_INFO_2 {
  PPP_NBFCP_INFO nbf;
  PPP_IPCP_INFO2 ip;
  PPP_IPXCP_INFO ipx;
  PPP_ATCP_INFO  at;
  PPP_CCP_INFO   ccp;
  PPP_LCP_INFO   lcp;
} PPP_INFO_2;

typedef struct _PPP_IPCP_INFO2 {
  DWORD dwError;
  WCHAR wszAddress[IPADDRESSLEN + 1];
  WCHAR wszRemoteAddress[IPADDRESSLEN + 1];
  DWORD dwOptions;
  DWORD dwRemoteOptions;
} PPP_IPCP_INFO2;

 1 [StructLayout(LayoutKind.Sequential,CharSet = CharSet.Unicode)]
 2 public struct RAS_CONNECTION_2
 3 {            
 4         public IntPtr hConnection;
 5         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = UNLEN)]
 6         public string wszUserName;
 7         public ROUTER_INTERFACE_TYPE dwInterfaceType;
 8         public Guid guid;
 9         public PPP_INFO_2 PppInfo2;
10 };

“System.TypeLoadException”类型的异常在 mscorlib.dll 中发生，但未在用户代码中进行处理

其他信息: 无法封送处理类型为“****”的字段“wszPortName”: 无效的托管/非托管类型组合(String 类型的字段必须与 LPStr、LPWStr、LPTStr、BStr 或 ByValTStr 成对出现)。