控制图片尺寸的显示

描述：把图片存储在在SQL Server中，在页面显示时因为图片太大，有时会把网页撑开，影响网页的美观。但又不用缩略图的方式，以下的实现是当图片超过一定尺寸时把限制图片的显示大小，如果小于一定的尺寸就按原尺寸显示。且点击图片后都可在新窗口中浏览。

protected int imgWidth=500;
protected int imgHeight = 430;
Stream stream = new MemoryStream();

/**//// <summary>
/// 处理图片
/// </summary>
/// <param name="imgGuid">图片的GUID</param>
void InitImgFile(string imgGuid)
        {
            if (!string.IsNullOrEmpty(imgGuid))
            {               
                string _contentType = null;
                try
                {
                    DataSet ds = Gdf.External.Business.Image.External_CultureGetImageListByGuid(imgGuid);//Gdf.External.Business.Image.External_IntroductionGetImageContent(imgGuid);
                    if (ds != null)
                    {
                        _contentType = ds.Tables[0].Rows[0]["ContentType"].ToString();

                        GetImageSize((byte[])ds.Tables[0].Rows[0]["Content"]);
                    }
                }
                catch (Exception ex)
                {
                    return;
                }
            }
        }

private void GetImageSize(byte[] buffer)
        {            
            Bitmap bmp = new Bitmap(new MemoryStream(buffer));
            try
            {
                System.Drawing.Image.GetThumbnailImageAbort myCallback = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
                //默认显示参数
                int intDefaultWidth = 650;

                if (intDefaultWidth >= bmp.Width)
                {
                    this.imgWidth = bmp.Width;
                    this.imgHeight = bmp.Height;
                }
                else
                {                    
                    this.imgWidth = 500;
                    this.imgHeight = 430;

                }
            }
            catch (Exception ex)
            {
                return;

            }
            finally
            {
                // dispose the bmp object
                stream.Position = 0;
                bmp.Dispose();
            }
        }

public bool ThumbnailCallback()
        {
            return false;
        }

 public bool IsReusable
        {
            get
            {
                return false;
            }
        }