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Anyway to check if an 'id" is a GUID?

Posted on 2009-05-15
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Last Modified: 2012-05-07
Anyway to check and see if this "id" actually contains a GUID. Sometimes the ID holds ";nbsp" and code fails.

 if (e.Item is GridEditableItem)
            {
                GridEditableItem editedItem = e.Item as GridEditableItem;

                string id = editedItem["Id"].Text;
             
                Basket basket = Basket.Items.FindById(new Guid(id)); //**fails here if ID is not GUID
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Question by:Camillia
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4 Comments
 
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Expert Comment

by:svelluto
ID: 24397016
Why don't you check the length of the 'id' string after you set it.

View Code Sample.

You could even check if the id string is the same length as the GUID.

Or if you would like to use REGEX to test for a GUID,
here is a good example:

http://geekswithblogs.net/jawad/archive/2005/05/20/GuidVerifier.aspx



if (id.length > 6) //  - 6 Characters
{
 
Basket basket = Basket.Items.FindById(new Guid(id));
 
}
 
//Another Example
 
if (id.length == guid.length) //guid.length could be a number
{
 
Basket basket = Basket.Items.FindById(new Guid(id));
 
}

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Author Comment

by:Camillia
ID: 24397200
let me try.
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Accepted Solution

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ajolly earned 500 total points
ID: 24398143
Try this
public static bool isValidGuid(String guid)
{
    bool isValid = false;
    Regex re = new Regex(@"^(\{){0,1}[0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12}(\}){0,1}$", RegexOptions.IgnoreCase);
    if (re.IsMatch(guid))
    {
        isValid = true;
    }
    return isValid;
}

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Author Comment

by:Camillia
ID: 24398602
I did id.Length == 36 but i think ajolly's method might be better. Let me try.
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