Question

我尝试从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，问题出在保存时。

请帮忙??

无法将参数值从picturebox转换为Byte []

保存图片的代码

 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();



        }

Answer 1

试试这种方式;

list
|> Enum.reduce(%{}, fn (el, acc) -> Dict.put(acc, el, Dict.get(acc, el, 0) + 1) end)
|> Enum.filter(fn {key, val} -> val == 1 end)
|> Enum.map(fn {key, val} -> key end)

将映像保存到sql server 2008数据库问题？

1 个答案: