求助：需要用C#写一个COPY大文件的程序

Question

你每次读取500K-1M字节，就这么循环下不就行了

Answer 1

namespace MainCopySys
{    public delegate void Complete(bool state);
    public delegate void ProcessBoxChange(int persent);    public class FileCopy
    {
        private string sourceFile;        public string SourceFile
        {
            get { return sourceFile; }
            set { sourceFile = value; }
        }
        private string destFile;        public string DestFile
        {
            get { return destFile; }
            set { destFile = value; }
        }        private FileStream dest;
        private FileStream source;        private AsyncCallback call;        public Complete ReportResult;        /// <summary>
        /// 进度条数据
        /// </summary>        private int percent = 0;
        public ProcessBoxChange ProcessChanged;        /// <summary>
        /// 作为缓冲区
        /// </summary>
        private byte[] buffer;        /// <summary>
        /// 带参构造器
        /// </summary>
        /// <param name="sourceFile"></param>
        /// <param name="destFile"></param>
        public FileCopy(string sourceFile, string destFile)
        {        }
        /// <summary>
        /// 无参构造器
        /// </summary>
        public FileCopy()
            : this(string.Empty, string.Empty)
        {        }        /// <summary>
        /// 同步复制
        /// </summary>
        public void SynCopy()
        {
            try
            {
                source = new FileStream(SourceFile, FileMode.Open);
                dest = new FileStream(DestFile, FileMode.Create);
                //对源流的字节块进行百分比转换确保每行都能转换采用数学的Ceiling方法
                int length = (int)Math.Ceiling((double)source.Length / 100);
                buffer = new byte[length];                //对源流字节写入缓冲区的数据
                int len = 0;
                while ((len = source.Read(buffer, 0, length)) > 0)
                {
                    //反读缓冲区
                    dest.Write(buffer, 0, len);
                }
                if (ReportResult != null)
                {
                    ReportResult(true);
                }
            }
            catch
            {
                if (ReportResult != null)
                {
                    ReportResult(false);
                }
            }
            finally
            {
                source.Close();
                dest.Close();
            }
        }
        /// <summary>
        /// 异步复制
        /// </summary>
        public void AsynCopy()
        {
            source = new FileStream(SourceFile, FileMode.Open, FileAccess.Read, FileShare.Read, 5000, true);
            dest = new FileStream(DestFile, FileMode.Create);
            int len = (int)Math.Ceiling((double)source.Length / 100);
            buffer = new byte[len];
            //委托的初始化参数表中使用“方法名”
            call = new AsyncCallback(CallBack);
            source.BeginRead(buffer, 0, buffer.Length, call, null);
        }        /// <summary>
        /// 实现相应异步操作完成时的状态
        /// </summary>
        /// <param name="ir">接口异步操作状态</param>
        private void CallBack(IAsyncResult ir)
        {
            int count = source.EndRead(ir);
            if (count > 0)
            {
                dest.Write(buffer, 0, count);                if (ProcessChanged != null)
                {
                    ProcessChanged(++percent);
                }                source.BeginRead(buffer, 0, buffer.Length, call, null);
            }
            else
            {
                dest.Close();
                source.Close();
            }
        }
    }
}此代码需要怎么改进呢 ？