B
bob scola
I have a csharp, VS 2003 solution for a winform application
The application uses an object called a "matter" and the class is
defined in matter.cs.
I can load matter objects into a combobox
Matter[] matters= v.Matters;
comboBox1.Items.AddRange(matters);
And I can fetch the matter object after a selection:
private void comboBox1_SelectedIndexChanged(object sender,
System.EventArgs e)
{
Matter m;
m= (Matter) comboBox1.SelectedItem;
Debug.WriteLine(m.GetType().ToString()); // --> MIDE.Matter
Debug.WriteLine(m.Name); // this works ok
Debug.WriteLine(m.ID); // this works ok
}
All is working well-
Now I want a UserControl which also has a combobox which is loaded
with a set of Matters.
I add a new project in the solution for my UserControl & I ctrl-drag
matter.cs into the UserControl's solution.
In my UserControl, I can populate & display the combox fine, but when
I go to fetch the object out of it, I get a
System.InvalidCastException.
Note that I can get the object from the combobox as an object, the
object tells me it the proper type, and I can run the objects
ToString() fine, but my cast is dying.
in the user control --
private void cboMatterName_SelectedIndexChanged(object sender,
System.EventArgs e)
{
object o;
o= cboMatterName.SelectedItem;
Debug.WriteLine(o.GetType().ToString()); // --> MIDE.Matter
Debug.WriteLine(o.ToString()); // This works ok
Matter m;
// *** this throws a System.InvalidCastException ***
m= (Matter) cboMatterName.SelectedItem;
}
Any ideas?
thanx
Bob
The application uses an object called a "matter" and the class is
defined in matter.cs.
I can load matter objects into a combobox
Matter[] matters= v.Matters;
comboBox1.Items.AddRange(matters);
And I can fetch the matter object after a selection:
private void comboBox1_SelectedIndexChanged(object sender,
System.EventArgs e)
{
Matter m;
m= (Matter) comboBox1.SelectedItem;
Debug.WriteLine(m.GetType().ToString()); // --> MIDE.Matter
Debug.WriteLine(m.Name); // this works ok
Debug.WriteLine(m.ID); // this works ok
}
All is working well-
Now I want a UserControl which also has a combobox which is loaded
with a set of Matters.
I add a new project in the solution for my UserControl & I ctrl-drag
matter.cs into the UserControl's solution.
In my UserControl, I can populate & display the combox fine, but when
I go to fetch the object out of it, I get a
System.InvalidCastException.
Note that I can get the object from the combobox as an object, the
object tells me it the proper type, and I can run the objects
ToString() fine, but my cast is dying.
in the user control --
private void cboMatterName_SelectedIndexChanged(object sender,
System.EventArgs e)
{
object o;
o= cboMatterName.SelectedItem;
Debug.WriteLine(o.GetType().ToString()); // --> MIDE.Matter
Debug.WriteLine(o.ToString()); // This works ok
Matter m;
// *** this throws a System.InvalidCastException ***
m= (Matter) cboMatterName.SelectedItem;
}
Any ideas?
thanx
Bob