本文实例讲述了C#实现把图片转换成二进制以及把二进制转换成图片的方法。分享给大家供大家参考，具体如下：
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private void button1_Click(object sender, EventArgs e){ string path = this.textBox1.Text; byte[] imgBytesIn = SaveImage(path); ShowImgByByte(imgBytesIn); //Parameters.Add("@Photo", SqlDbType.Binary).Value = imgBytesIn;}//将图片以二进制流public byte[] SaveImage(String path){ FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read); //将图片以文件流的形式进行保存 BinaryReader br = new BinaryReader(fs); byte[] imgBytesIn = br.ReadBytes((int)fs.Length); //将流读入到字节数组中 return imgBytesIn;}//现实二进制流代表的图片public void ShowImgByByte(byte[] imgBytesIn){ MemoryStream ms = new MemoryStream(imgBytesIn); pictureBox1.Image = Image.FromStream(ms);} |
二、将图片保存到数据库中，并从数据库中读取：
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#region 将图片从数据库中读取/// <summary>/// 将图片从数据库中读取/// </summary>/// <param name="xs_ID">要读取图片的学号</param>/// <param name="ph">pictureBox1控件名</param>public void get_photo(string xs_ID, PictureBox ph)//将图片从数据库中读取{ byte[] imagebytes = null; getcon(); SqlCommand con = new SqlCommand("select * from S_jiben where S_num='" + xs_ID + "'", link); SqlDataReader dr = con.ExecuteReader(); while (dr.Read()) { imagebytes =(byte[])dr.GetValue(18); } dr.Close(); con_close(); MemoryStream ms = new MemoryStream(imagebytes); Bitmap bmpt = new Bitmap(ms); ph.Image = bmpt;}#endregion#regionpublic void SaveImage(string MID, OpenFileDialog openF)//将图片以二进制存入数据库中{ string strimg = openF.FileName.ToString(); //记录图片的所在路径 FileStream fs = new FileStream(strimg, FileMode.Open, FileAccess.Read); //将图片以文件流的形式进行保存 BinaryReader br = new BinaryReader(fs); byte[] imgBytesIn = br.ReadBytes((int)fs.Length); //将流读入到字节数组中 getcon(); StringBuilder strSql = new StringBuilder(); strSql.Append("update S_jiben Set xs_photo=@Photo where S_num=" + MID); SqlCommand cmd = new SqlCommand(strSql.ToString(), link); cmd.Parameters.Add("@Photo", SqlDbType.Binary).Value = imgBytesIn; cmd.ExecuteNonQuery(); con_close();}#endregion |
希望本文所述对大家C#程序设计有所帮助。
