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C# 将映像保存到sql server 2008数据库问题?_C#_Sql Server 2008_Filestream - Fatal编程技术网

C# 将映像保存到sql server 2008数据库问题?

C# 将映像保存到sql server 2008数据库问题?,c#,sql-server-2008,filestream,C#,Sql Server 2008,Filestream,我在尝试从c#app保存图像时遇到以下错误消息。到SQL Server 2008数据库 请注意,加载工作正常,问题在于保存时。 请帮忙 无法将参数值从picturebox转换为字节[] 保存图像的代码 private void saveLogo() { SqlConnection conn = new SqlConnection(dbcon.ReturnConnection()); try {

我在尝试从c#app保存图像时遇到以下错误消息。到SQL Server 2008数据库

请注意,加载工作正常,问题在于保存时。

请帮忙

无法将参数值从picturebox转换为字节[]

保存图像的代码

 private void saveLogo()
            {

         SqlConnection   conn = new SqlConnection(dbcon.ReturnConnection());

            try
            {
         SqlCommand sqlCommand1 = conn.CreateCommand();
                sqlCommand1.CommandText = "INSERT INTO OrgLogo(ID,LogoName,Picture) values(@ID,@Name,@Picture)";

                conn.Open();
                if (sqlCommand1.Parameters.Count == 0)
                {                  
                   sqlCommand1.Parameters.Add("@ID", System.Data.SqlDbType.Int, 4);
                   sqlCommand1.Parameters.Add("@Name", System.Data.SqlDbType.VarChar, 50);
                  sqlCommand1.Parameters.Add("@Picture", System.Data.SqlDbType.Image);
                }
          sqlCommand1.Parameters["@ID"].Value =Convert.ToInt32( editID.Text);
           sqlCommand1.Parameters["@Name"].Value = editName.Text;
           sqlCommand1.Parameters["@Picture"].Value = pictureBox1;

           sqlCommand1.ExecuteNonQuery();             

            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);

            }
            finally
            {
                conn.Close();

            }
        }
打开图像文件的代码

protected void LoadLogoPic()
        {

            this.openFileDialog2.ShowDialog();

            string strFn = this.openFileDialog2.FileName;
                this.pictureBox1.Image = Image.FromFile(strFn);
                this.openFileDialog2.Filter = "All Files|*.*|BMP Files|*.bmp|JPG Files|*.jpg"; 
                FileInfo fiImage = new FileInfo(strFn);
              m_lImageFileLength = fiImage.Length;
                FileStream fs = new FileStream(strFn, FileMode.Open, FileAccess.Read, FileShare.Read);
                m_barrImg = new byte[Convert.ToInt32(this.m_lImageFileLength)];
                int iBytesRead = fs.Read(m_barrImg, 0, Convert.ToInt32(this.m_lImageFileLength));
                fs.Close();



        }
试着这样做

Image img = picturebox1.Image();
byte[] arr;
ImageConverter converter = new ImageConverter();
arr=(byte[])converter.ConvertTo(img, typeof(byte[]));

command.CommandText = "INSERT INTO ImagesTable (Image) VALUES('" + arr + "')";
command.CommandType = CommandType.Text;
command.ExecuteNonQuery();

该语句将以“INSERT INTO ImagesTable(图像)值('System.Byte[])”结尾。使用字符串连接从来都不是SQL问题的解决方案,它只是像本例中那样添加新的问题。事实上,如果传递的是实际的字节数组,而不是您试图存储PictureBox控件而不是图像数据的控件,则OP的代码可以工作。如果将图像的字节(即
m_barrImg
)作为参数值传递,则该语句至少适用于小图片。对于较大的,您必须使用