Value of '0' is not valid for 'SelectedIndex'

  • Thread starter Thread starter Andrus
  • Start date Start date
A

Andrus

To reproduce, run the code.

Observed:
System.ArgumentOutOfRangeException was unhandled
Message="InvalidArgument=Value of '0' is not valid for
'SelectedIndex'.\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.


using System.Windows.Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add("displaymember");
t.Columns.Add("valuemember");
t.Rows.Add("lower", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.DisplayMember = "displaymember";
comboBox1.ValueMember = "valuemember";
comboBox1.DataSource = t;
comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;
comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

DataTable t2 = new DataTable();
t2.Columns.Add("c1");
t2.Rows.Add("l");
comboBox1.DataBindings.Add("SelectedValue", t2, "c1");
Controls.AddRange(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run(new testForm());
}
}
 
It isn't legal if it's a string.

--
HTH,

Kevin Spencer
Microsoft MVP

Printing Components, Email Components,
FTP Client Classes, Enhanced Data Controls, much more.
DSI PrintManager, Miradyne Component Libraries:
http://www.miradyne.net
 
Kevin,

thank you.
The code does not set SelectedIndex as all.

Why .NET tries to set SelectedIndex to invalid value ?

Andrus.
It isn't legal if it's a string.
Observed:
System.ArgumentOutOfRangeException was unhandled
Message="InvalidArgument=Value of '0' is not valid for
'SelectedIndex'.\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.


using System.Windows.Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add("displaymember");
t.Columns.Add("valuemember");
t.Rows.Add("lower", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.DisplayMember = "displaymember";
comboBox1.ValueMember = "valuemember";
comboBox1.DataSource = t;
comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;
comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

DataTable t2 = new DataTable();
t2.Columns.Add("c1");
t2.Rows.Add("l");
comboBox1.DataBindings.Add("SelectedValue", t2, "c1");
Controls.AddRange(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run(new testForm());
}
}
Click to expand...
Click to expand...
 
Andrus said:
To reproduce, run the code.

Observed:
System.ArgumentOutOfRangeException was unhandled
Message="InvalidArgument=Value of '0' is not valid for
'SelectedIndex'.\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.


using System.Windows.Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add("displaymember");
t.Columns.Add("valuemember");
t.Rows.Add("lower", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.DisplayMember = "displaymember";
comboBox1.ValueMember = "valuemember";
comboBox1.DataSource = t;
comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;
comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

DataTable t2 = new DataTable();
t2.Columns.Add("c1");
t2.Rows.Add("l");
comboBox1.DataBindings.Add("SelectedValue", t2, "c1");
Controls.AddRange(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run(new testForm());
}
}
Click to expand...

You can't select a specific item from a combobox that doesn't contain
any items at all.

You haven't databound the combobox, so it doesn't contain any items.
 
Andrus said:
Kevin,

thank you.
The code does not set SelectedIndex as all.

Why .NET tries to set SelectedIndex to invalid value ?

Andrus.
Click to expand...

You are setting the SelectedValue property. That will basically look for
the value among the items, and set the SelectedIndex property for the
matching item.
 
Andrus said:
To reproduce, run the code.

Observed:
System.ArgumentOutOfRangeException was unhandled
Message="InvalidArgument=Value of '0' is not valid for
'SelectedIndex'.\r\nParameter name: SelectedIndex"

t2.c1 contains legal value.
Why this error occurs ?
How to fix ?

Andrus.


using System.Windows.Forms;
using System.Data;
using System;
class testForm : Form {

testForm() {
DataTable t = new DataTable();
t.Columns.Add("displaymember");
t.Columns.Add("valuemember");
t.Rows.Add("lower", "l");

ComboBox comboBox1 = new ComboBox();
comboBox1.DisplayMember = "displaymember";
comboBox1.ValueMember = "valuemember";
comboBox1.DataSource = t;
comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;
comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

DataTable t2 = new DataTable();
t2.Columns.Add("c1");
t2.Rows.Add("l");
comboBox1.DataBindings.Add("SelectedValue", t2, "c1");
Controls.AddRange(new Control[] { comboBox1 });
}

[STAThread]
static void Main() {
Application.Run(new testForm());
}
}
Click to expand...

Hi,

This is *totally* a guess, because I haven't tried your code, but try moving
this line:

comboBox1.DataSource = t;

So it immediately follows this line:

ComboBox comboBox1 = new ComboBox();
 
Rachit said:
Unhandled Exception:

InvalidArgument=Value of '41' is not valid for 'SelectedIndex'.
Parameter name: SelectedIndex

System.ArgumentOutOfRangeException
Click to expand...

I'm not sure why you responded to a post from several years ago...

At the line where you get the error, how many items does the debugger
say are in the control? If there are 41 items, you must use
SelectedIndex in the range 0 to 40.
 
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