为什么我要再找一个角色?

时间:2016-07-28 15:28:32

标签: c# mysql blob

您好我使用此C#代码上传图片。

 protected void UploadFile(object sender, EventArgs e)
{
    string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
    string contentType = FileUpload1.PostedFile.ContentType;
    using (Stream fs = FileUpload1.PostedFile.InputStream)
    {
        using (BinaryReader br = new BinaryReader(fs))
        {
            byte[] bytes = br.ReadBytes((Int32)fs.Length);
            string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
            using (MySqlConnection con = new MySqlConnection(constr))
            {
                string query = "INSERT INTO foto(FileName, ContentType, Content) VALUES (@FileName, @ContentType, @Content)";
                using (MySqlCommand cmd = new MySqlCommand(query))
                {
                    cmd.Connection = con;
                    cmd.Parameters.AddWithValue("@FileName", filename);
                    cmd.Parameters.AddWithValue("@ContentType", contentType);
                    cmd.Parameters.AddWithValue("@Content", bytes);
                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
            }
        }
    }
    Response.Redirect(Request.Url.AbsoluteUri);
}

我在longblob字段中上传图像,然后显示我正在使用C#WebService,AJAX,JavaScript的图像,将图像转换为Base64String,但图像显示为不存在。

这是我的Base64String:

Base64String

正如您所看到的,问题在于这个额外的字符:

AAEAAAD/////AQAAAAAAAAAPAQAAAHgBAAAC

为什么会这样?我该如何解决?

2 个答案:

答案 0 :(得分:0)

很长一段时间我回到了同样的问题,我记不起当时的事情:

我检查我是否错了:

http://jsfiddle.net/hpP45/ 

我首先尝试解码(谷歌bse64解码器)

https://www.base64decode.org/ 

并将解码后的二进制数据保存为jpeg文件并打开它。

如果它没有打开那么我想,你的base64编码可能有问题

答案 1 :(得分:0)

可以用上面的代码

替换下面的线条吗?
      protected void UploadFile(object sender, EventArgs e)
        {
        string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
        string contentType = FileUpload1.PostedFile.ContentType;
        using (Stream fs = FileUpload1.PostedFile.InputStream)
            {
            using (BinaryReader br = new BinaryReader(fs))
                {
                System.Drawing.Image imagetuUpload = System.Drawing.Image.FromStream(fs);

                Bitmap bitmap = new Bitmap(imagetuUpload);
                System.IO.MemoryStream stream = new MemoryStream();
                bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
                stream.Position = 0;
                byte[] upproimag = new byte[stream.Length + 1];
                stream.Read(upproimag, 0, upproimag.Length);

                string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
                using (MySqlConnection con = new MySqlConnection(constr))
                    {
                    string query = "INSERT INTO foto(FileName, ContentType, Content) VALUES (@FileName, @ContentType, @Content)";
                    using (MySqlCommand cmd = new MySqlCommand(query))
                        {
                        cmd.Connection = con;
                        cmd.Parameters.AddWithValue("@FileName", filename);
                        cmd.Parameters.AddWithValue("@ContentType", contentType);
                        cmd.Parameters.AddWithValue("@Content", upproimag);
                        con.Open();
                        cmd.ExecuteNonQuery();
                        con.Close();
                        }
                    }
                }
            }
        Response.Redirect(Request.Url.AbsoluteUri);
        }

我跳,它可以帮助你:)