关于水晶报表动态设置图片，同比例缩放问题

string path = "";                byte[] bytes;                try                {                    path = Server.MapPath( "..//img//logoCompany.gif" );                    FileStream f = new FileStream( path, FileMode.Open, FileAccess.Read );                    BinaryReader br = new BinaryReader( f );                    //通过BinaryReader把图片流读成二进制数据                    bytes = br.ReadBytes( (int) f.Length );                }                catch                {                    bytes = null;                }                Bitmap img = null;                try                {                    img = new Bitmap( new MemoryStream( bytes ) );                } //转化为图片，控制像素Width和Heigth                catch                { }                for ( int i = 0; i < dt.Rows.Count; i++ )                {                    //为了防止翻页刷新掉Logo把所记录的新增列都更新成Logo的二进制数据                    dt.Rows[i]["Image"] = bytes;                }                string repoarpath = Server.MapPath("CR_APDetail.rpt");                myReport.Load(repoarpath, OpenReportMethod.OpenReportByTempCopy);                myReport.SetDataSource(ds);

                //----------------------------                try                {                    //这里是增加对水晶报表里图片控件的引用，ReportObjects["Image1"] 中的Image1就是我们拉到水晶报表里的图片字段的 ID编码                    BlobFieldObject x = (BlobFieldObject) myReport.ReportDefinition.ReportObjects["Image1"];                    EditImage( ref img, ref x );//同比例缩放图片函数                }                catch                {                }

                CrystalReportViewer1.DisplayGroupTree = false;                CrystalReportViewer1.ReportSource = myReport;

 

关于同比例缩放函数，很简单，首先获取水晶报表Image控件的宽和高，然后根据显示的图片大小进行同比例放大或缩小即可。

如有错误，欢迎指正！