值不能爲空。參數名稱編碼器MySql C＃

-1

我正在使用兩個單獨的按鈕來旋轉圖像並保存圖像。不知怎的，輪換正在工作。但保存（更新）不起作用。我試圖找到問題，但我不能。值不能爲空。參數名稱編碼器MySql C＃

錯誤是「值不能爲空。參數名稱編碼器」。我最好的猜測是RotateFlip是以某種方式影響圖片框。

問候

這是我的代碼，

private void btnRotate_Click(object sender, EventArgs e) 
     { 

      if (pictureBoxProfile.Image != null) 
      { 
       pictureBoxProfile.Image.RotateFlip(RotateFlipType.Rotate90FlipNone); 
       pictureBoxProfile.Refresh(); 
      } 
      else 
      { 
       MessageBox.Show("Select an Image"); 
      } 
     } 


private void btnSave_Click(object sender, EventArgs e) 
     { 
      if (txtShortName.Text == "" || txtPhoneNumberM.Text == "" || txtFullName.Text == "" || gender.Text == "" || richTextBoxAddress.Text == "" || txtPhoneNumberH.Text == "" || status.Text == "" || pictureBoxProfile.Image == null) 
      { 
       MessageBox.Show("Empty fields are detected!. Please fill up all fields"); 
       return; 
      } 

      try 
      { 

       con.Open();     

       MySqlCommand cmd2 = new MySqlCommand("UPDATE customer SET mr_mrs = @mr_mrs, short_name = @short_name, full_name = @full_name, nic_number = @nic_number, gender = @gender, address = @address, phone_no_home = @phone_no_home, phone_no_mobile = @phone_no_mobile, image = @image, status = @status, type = @type, nic_frnt = @nic_frnt, nic_back = @nic_back WHERE ([email protected]_number)", con); 

       MemoryStream ms = new MemoryStream(); 
       pictureBoxProfile.Image.Save(ms, pictureBoxProfile.Image.RawFormat); 
       byte[] img = ms.ToArray(); 

       MemoryStream ms2 = new MemoryStream(); 
       pictureBox1.Image.Save(ms2, pictureBox1.Image.RawFormat); 
       byte[] img2 = ms2.ToArray(); 

       MemoryStream ms3 = new MemoryStream(); 
       pictureBox3.Image.Save(ms3, pictureBox3.Image.RawFormat); 
       byte[] img3 = ms3.ToArray(); 

       cmd2.Parameters.AddWithValue("@mr_mrs", mr_mrs.Text); 
       cmd2.Parameters.AddWithValue("@short_name", txtShortName.Text); 
       cmd2.Parameters.AddWithValue("@full_name", txtFullName.Text); 
       cmd2.Parameters.AddWithValue("@nic_number", textBox1.Text); 
       cmd2.Parameters.AddWithValue("@gender", gender.Text); 
       cmd2.Parameters.AddWithValue("@address", richTextBoxAddress.Text); 
       cmd2.Parameters.AddWithValue("@phone_no_home", txtPhoneNumberH.Text); 
       cmd2.Parameters.AddWithValue("@phone_no_mobile", txtPhoneNumberM.Text); 
       cmd2.Parameters.AddWithValue("@status", status.Text); 
       cmd2.Parameters.AddWithValue("@image", img); 
       cmd2.Parameters.AddWithValue("@type", comboBox1.Text); 
       cmd2.Parameters.AddWithValue("@nic_frnt", img2); 
       cmd2.Parameters.AddWithValue("@nic_back", img3); 
       cmd2.ExecuteNonQuery(); 
       MessageBox.Show(this, "Customer updated succesfully!", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information); 
       this.Close(); 
       con.Close(); 
       ClearData(); 
      } 
      catch (MySqlException x) 
      { 
       MessageBox.Show(x.Message); 
       con.Close(); 
      } 
     }

來源

2017-08-20 Sandeep Ruwanpathirana

我猜你的一列設置爲'不NULL'，但你嘗試將它升級到'NULL' – Psi

你在MySQL數據庫的意思？ –

是的，這就是我懷疑的 – Psi

的問題是與Image.Save方法。相反的：

pictureBox1.Image.Save(ms, pictureBox1.Image.RawFormat);

試試這個：

pictureBox1.Image.Save(ms, Imageformat.Jpeg);

來源

2017-08-20 02:33:55 EsnEzz

值不能爲空。參數名稱編碼器MySql C＃

回答

相關問題