c#中image和byte[]的互相转换

参数是图片路径:返回Byte[]类型:

    //参数是图片的路径
        public byte[] GetPictureData(string imagePath)
        {
            FileStream fs = new FileStream(imagePath, FileMode.Open);
            byte[] byteData = new byte[fs.Length];
            fs.Read(byteData, 0, byteData.Length);
            fs.Close();
            return byteData;
        }

参数类型是Image对象,返回Byte[]类型

        //将Image转换成流数据,并保存为byte[] 
        public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto)
        {
            MemoryStream mstream = new MemoryStream();
            imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp);
            byte[] byData = new Byte[mstream.Length];
            mstream.Position = 0;
            mstream.Read(byData, 0, byData.Length); mstream.Close();
            return byData;
        }

参数是Byte[]类型,返回值是Image对象

        public System.Drawing.Image ReturnPhoto(byte[] streamByte)
        {
            System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte);
            System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
            return img;
        }

参数是Byte[] 类型,没有返回值(ASP.NET输出图片)

public void WritePhoto(byte[] streamByte)
        {
            // Response.ContentType 的默认值为默认值为“text/html”
            Response.ContentType = "image/GIF";
            //图片输出的类型有: image/GIF     image/JPEG
            Response.BinaryWrite(streamByte);
        }

 

posted @ 2015-01-23 14:25  清风灬  阅读(7409)  评论(0编辑  收藏  举报