增加了Windows里阻止系统电源选项里的系统睡眠，屏幕关闭API

SunnyUI/Common/USystem.cs

@@ -37,6 +37,36 @@ namespace Sunny.UI
     /// </summary>
     public static class SystemEx
     {
+        /// <summary>
+        /// 阻止系统电源选项里的系统睡眠，屏幕关闭。
+        /// </summary>
+        /// <param name="keepDisplayOn"></param>
+        public static void StartKeepDisplayOn(bool keepDisplayOn = true)
+        {
+            Kernel.SetThreadExecutionState(keepDisplayOn
+                  ? ExecutionState.Continuous | ExecutionState.SystemRequired | ExecutionState.DisplayRequired
+                  : ExecutionState.Continuous | ExecutionState.SystemRequired);
+        }
+
+        /// <summary>
+        /// 恢复系统电源选项里的系统睡眠，屏幕关闭。
+        /// </summary>
+        public static void RestoreDisplayState()
+        {
+            Kernel.SetThreadExecutionState(ExecutionState.Continuous);
+        }
+
+        /// <summary>
+        /// 重置系统计时器，临时性阻止系统睡眠和屏幕关闭。此效果类似于手动使用鼠标或键盘控制了一下电脑。
+        /// </summary>
+        /// <param name="keepDisplayOn"></param>
+        public static void ResetDisplayState(bool keepDisplayOn = true)
+        {
+            Kernel.SetThreadExecutionState(keepDisplayOn
+                ? ExecutionState.SystemRequired | ExecutionState.DisplayRequired
+                : ExecutionState.SystemRequired);
+        }
+
         /// <summary>
         /// 获取程序当前窗口的大小和位置
         /// </summary>

SunnyUI/Win32/Win32.Added.cs

@@ -178,8 +178,43 @@ namespace Sunny.UI.Win32
             uint BufferLength, IntPtr PreviousState, uint ReturnLength);
     }
 
+    [Flags]
+    public enum ExecutionState : uint
+    {
+        /// <summary>
+        /// Forces the system to be in the working state by resetting the system idle timer.
+        /// </summary>
+        SystemRequired = 0x01,
+
+        /// <summary>
+        /// Forces the display to be on by resetting the display idle timer.
+        /// </summary>
+        DisplayRequired = 0x02,
+
+        /// <summary>
+        /// This value is not supported. If <see cref="UserPresent"/> is combined with other esFlags values, the call will fail and none of the specified states will be set.
+        /// </summary>
+        [Obsolete("This value is not supported.")]
+        UserPresent = 0x04,
+
+        /// <summary>
+        /// Enables away mode. This value must be specified with <see cref="Continuous"/>.
+        /// <para />
+        /// Away mode should be used only by media-recording and media-distribution applications that must perform critical background processing on desktop computers while the computer appears to be sleeping.
+        /// </summary>
+        AwaymodeRequired = 0x40,
+
+        /// <summary>
+        /// Informs the system that the state being set should remain in effect until the next call that uses <see cref="Continuous"/> and one of the other state flags is cleared.
+        /// </summary>
+        Continuous = 0x80000000,
+    }
+
     public partial class Kernel
     {
+        [DllImport("kernel32")]
+        public static extern ExecutionState SetThreadExecutionState(ExecutionState esFlags);
+
         [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
         public static extern Int32 CompareStringEx(string localeName, int flags, string str1, int count1, string str2,
                 int count2, IntPtr versionInformation, IntPtr reserved, int param);