C# 设置本机日期格式

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using System; using System.Collections.Generic; using System.Linq; using System.Runtime.InteropServices; using System.Text;   namespace ZB.QueueSys.Common {     public class SetTimeHelper     {         //定义一个用于保存静态变量的实例         private static SetTimeHelper instance = null;         //定义一个保证线程同步的标识         private static readonly object locker = new object();         //构造函数为私有，使外界不能创建该类的实例         private SetTimeHelper() { }         public static SetTimeHelper Instance         {             get             {                 if (instance == null)                 {                     lock (locker)                     {                         if (instance == null) instance = new SetTimeHelper();                     }                 }                 return instance;             }         }           [DllImport("kernel32.dll", EntryPoint = "GetSystemDefaultLCID")]         public static extern int GetSystemDefaultLCID();         [DllImport("kernel32.dll", EntryPoint = "SetLocaleInfoA")]         public static extern int SetLocaleInfo(int Locale, int LCType, string lpLCData);         public const int LOCALE_SLONGDATE = 0x20;         public const int LOCALE_SSHORTDATE = 0x1F;         public const int LOCALE_STIME = 0x1003;           //[DllImport("kernel32.dll", EntryPoint = "SetLocaleInfoA")]         //public static extern int SetLocaleInfo(int Locale, int LCType, string lpLCData);         [DllImport("user32.dll", EntryPoint = "SendMessageTimeout")]         public static extern long SendMessageTimeout(int hWnd, int Msg, int wParam, int lParam, int fuFlags, int uTimeout, ref int lpdwResult);         [DllImport("User32.dll", EntryPoint = "PostMessage")]         public static extern int PostMessage(         int hWnd, // handle to destination window         int Msg, // message         int wParam, // first message parameter         int lParam // second message parameter         );           public const int LOCALE_USER_DEFAULT = 0x0400;         public const int LOCALE_SYSTEM_DEFAULT = 0x0800;         //public const int LOCALE_SSHORTDATE = 0x1F;         public const int LOCALE_STIMEFORMAT = 0x1003;         public const int HWND_BROADCAST = 0xFFFF;         public const int WM_SETTINGCHANGE = 0x001A;         public const int SMTO_ABORTIFHUNG = 2;           public void SetDateTimeFormat()         {             try             {                 int x = GetSystemDefaultLCID();                 SetLocaleInfo(x, LOCALE_STIME, "HH:mm:ss");        //时间格式                 SetLocaleInfo(x, LOCALE_SSHORTDATE, "yyyy-MM-dd");   //短日期格式                  SetLocaleInfo(x, LOCALE_SLONGDATE, "yyyy-MM-dd");   //长日期格式             }             catch (Exception ex)             {                 //Console.WriteLine(ex);             }         }           public void SetDateTimeFormat2()         {             int p = 0;             //设置短日期格式             SetLocaleInfo(LOCALE_USER_DEFAULT, LOCALE_SSHORTDATE, "yyyy-MM-dd");             //设置时间格式，24小时制             SetLocaleInfo(LOCALE_USER_DEFAULT, LOCALE_STIMEFORMAT, "HH:mm:ss");             //设置完成后必须调用，通知其他程序格式已经更改，否则即使是程序自身也不能使用新设置的格式             SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, 0, SMTO_ABORTIFHUNG, 10, ref p);         }           public void ConvertDateTimeFormat()         {             SetDateTimeFormat();             SetDateTimeFormat2();         }           } }