鼠标钩子上下文中不存在名称“WM_LBUTTONDOWN”

switch (wParam)
                {
                    case WM_LBUTTONDOWN:
                        button = MouseButtons.Left;
                        clickCount = 1;
                        break;
                    case WM_LBUTTONUP:
                        button = MouseButtons.Left;
                        clickCount = 1;
                        break;
                    case WM_LBUTTONDBLCLK:
                        button = MouseButtons.Left;
                        clickCount = 2;
                        break;
                    case WM_RBUTTONDOWN:
                        button = MouseButtons.Right;
                        clickCount = 1;
                        break;
                    case WM_RBUTTONUP:
                        button = MouseButtons.Right;
                        clickCount = 1;
                        break;
                    case WM_RBUTTONDBLCLK:
                        button = MouseButtons.Right;
                        clickCount = 2;
                        break;
                }

在这个switch case语句里面的WM_LBUTTONDOWN、WM_LBUTTONUP、WM_LBUTTONDBLCLK等这些东西都说上下文中不存在名称，完全不知道WM_LBUTTONDOWN、WM_LBUTTONUP、WM_LBUTTONDBLCLK这些东西要怎么用

要包含Winuser.h或windows.h头文件

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