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c# MLS Parsing, empty value error

Posted on 2010-01-11
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Last Modified: 2013-11-18
I am parsing an XML file on the fly to show a single value inside the XML file. The code I have works great until we find a record that has no value in the xml file.  I have tried a few things to make it only show up if there was a value but I haven't been able to figure it out.

any thoughts?

you can test it by changing the XML URL to a fake address and you will see the value I am using disappear.


XmlDocument doc = new XmlDocument();
        string varURL = "http://www.zillow.com/webservice/GetSearchResults.htm?zws-id=X1-ZWz1cwo6lcszyj_aui2x&address=12598+Dupont+Drive&citystatezip=Rancho+Cucamonga+91739";
        doc.Load(Server.UrlPathEncode(varURL));

        XmlNode root = doc.DocumentElement;
        ZEstimate.Text = root.SelectSingleNode("//response/results/result/zpid").ChildNodes[0].Value;
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Question by:bob1barker
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3 Comments
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 26283849
Hi bob1barker;

You can use a try/catch statement and test root to see if it null before displaying info.

Fernando
XmlDocument doc = new XmlDocument();
string varURL = "http://www.zillow.com/webservice/GetSearchResults.htm?zws-id=X1-ZWz1cwo6lcszyj_aui2x&address=12598+Dupont+Drive&citystatezip=Rancho+Cucamonga+91739";

XmlNode root = null;
string message = String.Empty;
try
{
    doc.Load(varURL);
    root = doc.DocumentElement;
}
catch
{
    message = "Error getting info.";
}

if( !(root == null) )
{
    ZEstimate.Text = root.SelectSingleNode("//response/results/result/zpid").ChildNodes[0].Value;
}
else
{
    ZEstimate.Text = message;
}

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Author Closing Comment

by:bob1barker
ID: 31675496
Worked Perfect
thanks
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LVL 63

Expert Comment

by:Fernando Soto
ID: 26294116
Not a problem, glad to help.  ;=)
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