- Thank you received: 0
Online Forums
Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.
Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.
Do not use the Contact page for technical issues.
daItemDialog causes System.NullReferenceException
11 Jan 2013 18:47 #1156
by kasssa
Replied by kasssa on topic Re: daItemDialog causes System.NullReferenceException
I'm just getting a Windows Visual Studio popup error message (below) - I don't see a call stack anywhere. Is there a way I can force one?
NullRefException_bw.jpg
I also have a try/catch block around my code, but it doesn't seem to catch the exception. Below is the code I'm executing...
private void button10_Click (object sender, EventArgs e)
{
// BROWSE
try
{
Console.WriteLine ("mach name: {0}; server ProgID: {1}",
comboBox1.Text, comboBox2.Text);
Debug.Assert (comboBox1.Text != null);
Debug.Assert (comboBox2.Text != null);
daItemDialog1.ServerDescriptor.MachineName = LOCALHOST; // comboBox1.Text;
daItemDialog1.ServerDescriptor.ServerClass = comboBox2.Text;
if (daItemDialog1.ShowDialog () == DialogResult.OK)
{
//Debug.Assert (daItemDialog1.NodeElement != null);
//richTextBox1.Text += daItemDialog1.NodeElement.ItemId + Environment.NewLine;
}
}
catch (Exception ex)
{
MessageBox.Show (ex.Message);
}
}
I'm a seasoned programmer, but fairly new to C#; please don't hesitate to make suggestions that would add to my knowledge!
Thank you!
NullRefException_bw.jpg
I also have a try/catch block around my code, but it doesn't seem to catch the exception. Below is the code I'm executing...
private void button10_Click (object sender, EventArgs e)
{
// BROWSE
try
{
Console.WriteLine ("mach name: {0}; server ProgID: {1}",
comboBox1.Text, comboBox2.Text);
Debug.Assert (comboBox1.Text != null);
Debug.Assert (comboBox2.Text != null);
daItemDialog1.ServerDescriptor.MachineName = LOCALHOST; // comboBox1.Text;
daItemDialog1.ServerDescriptor.ServerClass = comboBox2.Text;
if (daItemDialog1.ShowDialog () == DialogResult.OK)
{
//Debug.Assert (daItemDialog1.NodeElement != null);
//richTextBox1.Text += daItemDialog1.NodeElement.ItemId + Environment.NewLine;
}
}
catch (Exception ex)
{
MessageBox.Show (ex.Message);
}
}
I'm a seasoned programmer, but fairly new to C#; please don't hesitate to make suggestions that would add to my knowledge!
Thank you!
Please Log in or Create an account to join the conversation.
Moderators: support
Time to create page: 0.057 seconds