如何判断按下和释放鼠标
如题！

------解决方案--------------------
告诉你一个简单的方法，通过API GetKeyState()函数可以取得按键(包括鼠标按钮)的状态

using System.Runtime.InteropServices;

[DllImport( "user32.dll ")]
public static extern short GetKeyState(int nVirtKey);
public const int VK_LBUTTON = 1;
public const int VK_RBUTTON = 2;

这样判断
if (GetKeyState(VK_LBUTTON) & 0x80) == 0x80)
/* TODO 左键按下 */ ;
------解决方案--------------------
如果要是全局的判断,那么只有Hook是好使的,但是Hook在.NET是不好使的,你只有通过非托管的DLL,比如用VC++编写一个MFC的或Win32的DLL来实现这个HOOK,然后在.NET中通过调用这个API的方法来达到Hook的效果.
------解决方案--------------------
hook 在.net里一样可以用 底层的hook 键盘鼠标：WH_KEYBOARD_LL，WH_MOUSE_LL

------解决方案--------------------
zswang(伴水清清)(专家门诊清洁工) 正解

其中nVirtKey是虚拟键码 可以使用 以下V irtualKeys

public enum VirtualKeys: byte
{
VK_LBUTTON = 0x1,
VK_RBUTTON = 0x2,
VK_CANCEL = 0x3,
VK_MBUTTON = 0x4,
VK_BACK = 0x8,
VK_TAB = 0x9,
VK_CLEAR = 0xC,
VK_RETURN = 0xD,
VK_SHIFT = 0x10,
VK_CONTROL = 0x11,
VK_MENU = 0x12,
VK_PAUSE = 0x13,
VK_CAPITAL = 0x14,
VK_ESCAPE = 0x1B,
VK_SPACE = 0x20,
VK_PRIOR = 0x21,
VK_NEXT = 0x22,
VK_END = 0x23,
VK_HOME = 0x24,
VK_LEFT = 0x25,
VK_UP = 0x26,
VK_RIGHT = 0x27,
VK_DOWN = 0x28,
VK_Select = 0x29,
VK_PRINT = 0x2A,
VK_EXECUTE = 0x2B,
VK_SNAPSHOT = 0x2C,
VK_Insert = 0x2D,
VK_Delete = 0x2E,
VK_HELP = 0x2F,
VK_0 = 0x30,
VK_1 = 0x31,
VK_2 = 0x32,
VK_3 = 0x33,
VK_4 = 0x34,
VK_5 = 0x35,
VK_6 = 0x36,
VK_7 = 0x37,
VK_8 = 0x38,
VK_9 = 0x39,
VK_A = 0x41,
VK_B = 0x42,
VK_C = 0x43,
VK_D = 0x44,
VK_E = 0x45,
VK_F = 0x46,
VK_G = 0x47,
VK_H = 0x48,
VK_I = 0x49,
VK_J = 0x4A,
VK_K = 0x4B,
VK_L = 0x4C,
VK_M = 0x4D,
VK_N = 0x4E,
VK_O = 0x4F,
VK_P = 0x50,
VK_Q = 0x51,
VK_R = 0x52,
VK_S = 0x53,
VK_T = 0x54,
VK_U = 0x55,
VK_V = 0x56,
VK_W = 0x57,
VK_X = 0x58,
VK_Y = 0x59,
VK_Z = 0x5A,
VK_STARTKEY = 0x5B,
VK_CONTEXTKEY = 0x5D,
VK_NUMPAD0 = 0x60,
VK_NUMPAD1 = 0x61,
VK_NUMPAD2 = 0x62,
VK_NUMPAD3 = 0x63,
VK_NUMPAD4 = 0x64,
VK_NUMPAD5 = 0x65,
VK_NUMPAD6 = 0x66,
VK_NUMPAD7 = 0x67,
VK_NUMPAD8 = 0x68,
VK_NUMPAD9 = 0x69,
VK_MULTIPLY = 0x6A,
VK_ADD = 0x6B,
VK_SEPARATOR = 0x6C,
VK_SUBTRACT = 0x6D,
VK_DECIMAL = 0x6E,
VK_DIVIDE = 0x6F,
VK_F1 = 0x70,
VK_F2 = 0x71,
VK_F3 = 0x72,
VK_F4 = 0x73,
VK_F5 = 0x74,
VK_F6 = 0x75,
VK_F7 = 0x76,
VK_F8 = 0x77,
VK_F9 = 0x78,
VK_F10 = 0x79,
VK_F11 = 0x7A,
VK_F12 = 0x7B,
VK_F13 = 0x7C,
VK_F14 = 0x7D,
VK_F15 = 0x7E,
VK_F16 = 0x7F,
VK_F17 = 0x80,
VK_F18 = 0x81,
VK_F19 = 0x82,
VK_F20 = 0x83,
VK_F21 = 0x84,
VK_F22 = 0x85,
VK_F23 = 0x86,
VK_F24 = 0x87,
VK_NUMLOCK = 0x90,
VK_OEM_SCROLL = 0x91,
VK_OEM_1 = 0xBA,
VK_OEM_PLUS = 0xBB,
VK_OEM_COMMA = 0xBC,
VK_OEM_MINUS = 0xBD,
VK_OEM_PERIOD = 0xBE,
VK_OEM_2 = 0xBF,
VK_OEM_3 = 0xC0,
VK_OEM_4 = 0xDB,