Length cannot be less than zero.

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Hello everyone,

I am working with listbox and image controls in silverlight 5. Trying to display a image in image control by selecting a image name in the listbox. Below is the code using in listbox_selection changed event. What could be the reason for this exception.

Code:

C#

ImgesList.Source = 
new BitmapImage(new Uri(App.Current.Host.Source.OriginalString.Substring(0, App.Current.Host.Source.OriginalString.IndexOf("ClientBin")) + "Images/" + listBox1.SelectedItem));

Exception:

Length cannot be less than zero. Parameter name: length

Thanks in advance.

Posted 20-Mar-13 23:28pm

bapu_reddy

Updated 21-Mar-13 1:31am

Leo Chapiro

v2

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Comments

Richard MacCutchan 21-Mar-13 5:08am

The parameter name length does not appear in those two lines of code. Go back and check exactly where the exception is occurring.

bapu_reddy 21-Mar-13 7:18am

This is the only statement using in "Listbox_selectionchanged" event, where do I go back and check.....

2 solutions

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Mehdi Gholam · Answer 1 · 2013-03-21T01:37:00

Solution 1

Add the following if statement before your code:

C#

if(listbox1.SelectedIndex >= 0)
... // your normal code here

Posted 21-Mar-13 1:37am

Mehdi Gholam

Leo Chapiro · Answer 2 · 2013-03-21T01:37:00

This error occurs if the lenght of string in the method "Substring" is negative.
You can catch this exception like this:

C#

try {
   string str = App.Current.Host.Source.OriginalString.Substring(0, App.Current.Host.Source.OriginalString.IndexOf("ClientBin");
}
catch (ArgumentOutOfRangeException e) {
   
}

That means, check whether your string have "ClientBin" at all:

C#

int n = App.Current.Host.Source.OriginalString.IndexOf("ClientBin");
if (n > -1)
 ...

or something like this ;)

Length cannot be less than zero.

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Solution 2

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Length cannot be less than zero.

2 solutions

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Solution 2

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