求赐教 3.5框架下的类怎么改成2.0框架下的

[csuftliang]

如题，求大侠赐教，主要用了扩展方法，2.0不支持啊

public static class Helper {
        public static void Offset(this RectangleF source, int x, int y) { source.X += x; source.Y += y; }

        
        public static Bitmap GetSS(this Graphics grx, Rectangle bounds) {
            var res = new Bitmap(bounds.Width, bounds.Height);
            var gxc = Graphics.FromImage(res);
            IntPtr hdc = grx.GetHdc();
            PlatformAPI.BitBlt(gxc.GetHdc(), 0, 0, bounds.Width, bounds.Height, hdc, bounds.Left, bounds.Top, PlatformAPI.SRCCOPY);
            grx.ReleaseHdc(hdc);
            return res;
        }

        public static Bitmap Clip(this Bitmap source, Rectangle bounds) {
            var grx = Graphics.FromImage(source);
            return grx.GetSS(bounds);
        }

        
        public static Color BackgroundImageColor(this Bitmap bmp) {
            return bmp.GetPixel(0, 0);
        }
              

        public static Bitmap GetBitmap(string name) {
            Bitmap bmp = null;
            var asm = Assembly.GetExecutingAssembly();
            var resNames = asm.GetManifestResourceNames();
            foreach (string s in resNames) {
                if (s.IndexOf(name) > 0) {
                    using (var imgStream = asm.GetManifestResourceStream(s)) {
                        if (!(null == imgStream)) {
                            bmp = new Bitmap(imgStream);
                            if (!(null == bmp)) {
                                return bmp;
                            }
                            bmp = null;
                            imgStream.Close();
                        }
                    }
                }
            }
            return null;
        }
    }

    public static class Brushes {
        public static Brush White { get { return new SolidBrush(Color.White); } }
        public static Brush ControlDark { get { return new SolidBrush(SystemColors.ControlDark); } }
    }



    [StructLayout(LayoutKind.Sequential)]
    internal struct Rect {
        public int Left, Top, Right, Bottom;
        public static implicit operator Rectangle(Rect value) {
            return new Rectangle(value.Left, value.Top, value.Right - value.Left, value.Bottom - value.Top);
        }

        public static implicit operator Rect(Rectangle value) {
            return new Rect() { Top = value.Top, Left = value.Left, Bottom = value.Bottom, Right = value.Right };
        }
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct POINT {
        public int X;
        public int Y;

        public POINT(int x, int y) {
            this.X = x;
            this.Y = y;
        }

        public static implicit operator System.Drawing.Point(POINT p) {
            return new System.Drawing.Point(p.X, p.Y);
        }

        public static implicit operator POINT(System.Drawing.Point p) {
            return new POINT(p.X, p.Y);
        }
    }


    internal class PlatformAPI {
        [DllImport("coredll.dll")]
        public static extern int DrawText(IntPtr hDC, string lpString, int nCount, ref Rect lpRect, uint uFormat);

        [DllImport("coredll.dll")]
        public static extern IntPtr CreateCompatibleDC(IntPtr hDC);

        [DllImport("coredll.dll")]
        public static extern int BitBlt(IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, uint dwRop);

        public const uint SRCCOPY = 0x00CC0020;
    }

[以专业开发人员为伍]

如果只是扩展方法，那么你就把this这个词删掉，然后把所有出错的地方改为直接调用 Helper.XXXX() 这类就行了呗。

不过更好的办法是问一问负责维护服务器的人：今年都那一年了，还守着7年前的系统也不升级更新，难道连老系统的bug都不想借着升级而修复吗？

[faoyy]

2.0不支持扩展方法

[xonln]

由于NET2.0很普及,性能一般,给你一个方法,转到2.0的方法
一.把Sin文件的如4.0.0.0的所有替换.还有一个Microsoft Visual Studio Solution File, Format Version 8.00,还有一个# Visual Studio 2010改一个...这些用计事本改吧
二.还有一个csproj文件,Project ToolsVersion="4.0" DefaultTargets="Build" 改为2.0
还有一个$(MSBuildToolsPath)...改为$(MSBuildBinPath)
三.整个解决方安的文件里的如4.0.0.0替换为2.0.0.0,大量一点换,没有关系,这时用Vs2005就能打开了
四.一些不是C#2.0的语法,改一下,一个一个地改,
OK........

[threenewbee]

除非你还在用Windows 2000，否则没有必要退回到.NET 2.0。