C＃中的System.ArgumentException（参数无效）

Question

我有一个转换几个JPG文件的代码。这是代码：

            Parallel.ForEach(strarrFileList, strJPGImagePath =>
            {
                Bitmap bmpDest = new Bitmap(1, 1);

                creationTime = File.GetCreationTime(strJPGImagePath);
                lastWriteTime = File.GetLastWriteTime(strJPGImagePath);
                lastAccessTime = File.GetLastAccessTime(strJPGImagePath);

                try
                {
                    using (Bitmap bmpOrig = new Bitmap(strJPGImagePath))
                    {
                        intImageW = bmpOrig.Width;
                        intImageH = bmpOrig.Height;

                        if ((intImageW > intImageH) && (intImageW > intLongSide))
                        {
                            intImageH = (int)((double)intImageH / ((double)intImageW / (double)intLongSide));
                            intImageW = intLongSide;
                        }
                        else if ((intImageH > intImageW) && (intImageH > intLongSide))
                        {
                            intImageW = (int)((double)intImageW / ((double)intImageH / (double)intLongSide));
                            intImageH = intLongSide;
                        }
                        else if ((intImageH == intImageW) && (intImageW > intLongSide))
                        {
                            intImageH = intLongSide;
                            intImageW = intLongSide;
                        }
                        else
                        {
                            //something
                        }

                        try
                        {
                            bmpDest = new Bitmap(bmpOrig, new Size((Int32)intImageW, (Int32)intImageH));
                        }
                        catch (Exception ex1)
                        {
                            throw;
                        }
                    }
                }
                catch (Exception ex2)
                {
                    throw;
                }

                bmpDest.Save(strJPGImagePath, jgpEncoder, myEncoderParameters);
                bmpDest.Dispose();

                File.SetCreationTime(strJPGImagePath, creationTime);
                File.SetLastWriteTime(strJPGImagePath, lastWriteTime);
                File.SetLastAccessTime(strJPGImagePath, lastAccessTime);
            });

它适用于少于50个JPG文件，但是当文件数量增加时，它会在ex1或ex2随机出现异常。例外是：

类型＆＃39; System.ArgumentException＆＃39;的例外情况发生在mCPanel.exe但未在用户代码中处理 附加信息：参数无效。

当我将目标操作系统更改为X64时，我没有得到任何异常。但我需要在X86上解决这个问题。我在stackoverflow上发现了几个帖子，但实际上并没有回答这个问题。

我感谢任何帮助。

编辑：这是更新后的代码仍然存在同样的问题：

            Parallel.ForEach(strarrFileList, strJPGImagePath =>
            {
                creationTime = File.GetCreationTime(strJPGImagePath);
                lastWriteTime = File.GetLastWriteTime(strJPGImagePath);
                lastAccessTime = File.GetLastAccessTime(strJPGImagePath);

                Bitmap bmpOrig = new Bitmap(strJPGImagePath);
                intImageW = bmpOrig.Width;
                intImageH = bmpOrig.Height;

                if ((intImageW > intImageH) && (intImageW > intLongSide))
                {
                    intImageH = (int)((double)intImageH / ((double)intImageW / (double)intLongSide));
                    intImageW = intLongSide;
                }
                else if ((intImageH > intImageW) && (intImageH > intLongSide))
                {
                    intImageW = (int)((double)intImageW / ((double)intImageH / (double)intLongSide));
                    intImageH = intLongSide;
                }
                else if ((intImageH == intImageW) && (intImageW > intLongSide))
                {
                    intImageH = intLongSide;
                    intImageW = intLongSide;
                }
                else
                {
                    //do something
                }

                Bitmap bmpDest = new Bitmap(bmpOrig, new Size((Int32)intImageW, (Int32)intImageH));
                bmpOrig.Dispose();
                GC.SuppressFinalize(bmpOrig);

                bmpDest.Save(strJPGImagePath, jgpEncoder, myEncoderParameters);
                bmpDest.Dispose();
                GC.SuppressFinalize(bmpDest);

                File.SetCreationTime(strJPGImagePath, creationTime);
                File.SetLastWriteTime(strJPGImagePath, lastWriteTime);
                File.SetLastAccessTime(strJPGImagePath, lastAccessTime);
            });