这个类的代码给出了一些错误，其中大部分出现在如下标志上： & 和 > 和 < 并且只有 & 它可能是什么？我该如何修复它们？
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Runtime.InteropServices;
namespace CaptureScreenDirect3D
{
public static class Direct3DCapture
{
private static SlimDX.Direct3D9.Direct3D _direct3D9 = new SlimDX.Direct3D9.Direct3D();
private static Dictionary<IntPtr, SlimDX.Direct3D9.Device> _direct3DDeviceCache = new Dictionary<IntPtr, SlimDX.Direct3D9.Device>();
/// <summary>
/// Capture the entire client area of a window
/// </summary>
/// <param name="hWnd"></param>
/// <returns></returns>
public static Bitmap CaptureWindow(IntPtr hWnd)
{
return CaptureRegionDirect3D(hWnd, NativeMethods.GetAbsoluteClientRect(hWnd));
}
/// <summary>
/// Capture a region of the screen using Direct3D
/// </summary>
/// <param name="handle">The handle of a window</param>
/// <param name="region">The region to capture (in screen coordinates)</param>
/// <returns>A bitmap containing the captured region, this should be disposed of appropriately when finished with it</returns>
public static Bitmap CaptureRegionDirect3D(IntPtr handle, Rectangle region)
{
IntPtr hWnd = handle;
Bitmap bitmap = null;
// We are only supporting the primary display adapter for Direct3D mode
SlimDX.Direct3D9.AdapterInformation adapterInfo = _direct3D9.Adapters.DefaultAdapter;
SlimDX.Direct3D9.Device device;
#region Get Direct3D Device
// Retrieve the existing Direct3D device if we already created one for the given handle
if (_direct3DDeviceCache.ContainsKey(hWnd))
{
device = _direct3DDeviceCache[hWnd];
}
// We need to create a new device
else
{
// Setup the device creation parameters
SlimDX.Direct3D9.PresentParameters parameters = new SlimDX.Direct3D9.PresentParameters();
parameters.BackBufferFormat = adapterInfo.CurrentDisplayMode.Format;
Rectangle clientRect = NativeMethods.GetAbsoluteClientRect(hWnd);
parameters.BackBufferHeight = clientRect.Height;
parameters.BackBufferWidth = clientRect.Width;
parameters.Multisample = SlimDX.Direct3D9.MultisampleType.None;
parameters.SwapEffect = SlimDX.Direct3D9.SwapEffect.Discard;
parameters.DeviceWindowHandle = hWnd;
parameters.PresentationInterval = SlimDX.Direct3D9.PresentInterval.Default;
parameters.FullScreenRefreshRateInHertz = 0;
// Create the Direct3D device
device = new SlimDX.Direct3D9.Device(_direct3D9, adapterInfo.Adapter, SlimDX.Direct3D9.DeviceType.Hardware, hWnd, SlimDX.Direct3D9.CreateFlags.SoftwareVertexProcessing, parameters);
_direct3DDeviceCache.Add(hWnd, device);
}
#endregion
// Capture the screen and copy the region into a Bitmap
using (SlimDX.Direct3D9.Surface surface = SlimDX.Direct3D9.Surface.CreateOffscreenPlain(device, adapterInfo.CurrentDisplayMode.Width, adapterInfo.CurrentDisplayMode.Height, SlimDX.Direct3D9.Format.A8R8G8B8, SlimDX.Direct3D9.Pool.SystemMemory))
{
device.GetFrontBufferData(0, surface);
// Update: thanks digitalutopia1 for pointing out that SlimDX have fixed a bug
// where they previously expected a RECT type structure for their Rectangle
bitmap = new Bitmap(SlimDX.Direct3D9.Surface.ToStream(surface, SlimDX.Direct3D9.ImageFileFormat.Bmp, new Rectangle(region.Left, region.Top, region.Width, region.Height)));
// Previous SlimDX bug workaround: new Rectangle(region.Left, region.Top, region.Right, region.Bottom)));
}
return bitmap;
}
}
#region Native Win32 Interop
/// <summary>
/// The RECT structure defines the coordinates of the upper-left and lower-right corners of a rectangle.
/// </summary>
[Serializable, StructLayout(LayoutKind.Sequential)]
internal struct RECT
{
public int Left;
public int Top;
public int Right;
public int Bottom;
public RECT(int left, int top, int right, int bottom)
{
this.Left = left;
this.Top = top;
this.Right = right;
this.Bottom = bottom;
}
public Rectangle AsRectangle
{
get
{
return new Rectangle(this.Left, this.Top, this.Right - this.Left, this.Bottom - this.Top);
}
}
public static RECT FromXYWH(int x, int y, int width, int height)
{
return new RECT(x, y, x + width, y + height);
}
public static RECT FromRectangle(Rectangle rect)
{
return new RECT(rect.Left, rect.Top, rect.Right, rect.Bottom);
}
}
[System.Security.SuppressUnmanagedCodeSecurity()]
internal sealed class NativeMethods
{
[DllImport("user32.dll")]
internal static extern bool GetClientRect(IntPtr hWnd, out RECT lpRect);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
/// <summary>
/// Get a windows client rectangle in a .NET structure
/// </summary>
/// <param name="hwnd">The window handle to look up</param>
/// <returns>The rectangle</returns>
internal static Rectangle GetClientRect(IntPtr hwnd)
{
RECT rect = new RECT();
GetClientRect(hwnd, out rect);
return rect.AsRectangle;
}
/// <summary>
/// Get a windows rectangle in a .NET structure
/// </summary>
/// <param name="hwnd">The window handle to look up</param>
/// <returns>The rectangle</returns>
internal static Rectangle GetWindowRect(IntPtr hwnd)
{
RECT rect = new RECT();
GetWindowRect(hwnd, out rect);
return rect.AsRectangle;
}
internal static Rectangle GetAbsoluteClientRect(IntPtr hWnd)
{
Rectangle windowRect = NativeMethods.GetWindowRect(hWnd);
Rectangle clientRect = NativeMethods.GetClientRect(hWnd);
// This gives us the width of the left, right and bottom chrome - we can then determine the top height
int chromeWidth = (int)((windowRect.Width - clientRect.Width) / 2);
return new Rectangle(new Point(windowRect.X + chromeWidth, windowRect.Y + (windowRect.Height - clientRect.Height - chromeWidth)), clientRect.Size);
}
}
#endregion
}
例如，在这一行上，我在所有标志上都遇到错误，例如： & 和 >
private static Dictionary<IntPtr, SlimDX.Direct3D9.Device> _direct3DDeviceCache = new Dictionary<IntPtr, SlimDX.Direct3D9.Device>();
而且在其他线路上。
我该如何解决这个错误？