Check if object is empty or NULL

Question

I want to check is object is empty or is NULL.

First I have a web method that take has input parameter XML document

[WebMethod(CacheDuration = 0, EnableSession=true, Description = "Učitaj dokument iz Aurore")]
public System.Xml.XmlDocument Load_DOK(System.Xml.XmlDocument XmlDoc)   //xml doc
{
}

In this method I have to check if XmlDoc is empty, if is throw error.

I wrote something like this:

try
{
    if( XmlDoc == null)
        errorMessage = "Input parameter is NULL!";
}
catch (Exception ex)
{
    WriteErrors.WriteToLogFile("WS.LOAD_DOK", ex.ToString());

    errorMessage = ex.Message;

    //Error exception
    soapEnvelop.LoadXml(@"<soap:Envelope xmlns:soap=""http://schemas.xmlsoap.org/soap/envelope/"" xmlns:xsi=""http://www.w3.org/2001/XMLSchema"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema""><soap:Body><Response_status>1</Response_status><Description>" + ex.Message + "</Description></soap:Body></soap:Envelope>");
    return soapEnvelop;
}

I want to know is this the right way or is there a simpler way to do it?

if your try block has only the code you specified, then I don't think you will get any exception — Habib
– Habib, Commented Jul 25, 2012 at 10:07
What to you want the behaviour to be - that caller should get an exception? just the status? null? — sternr
– sternr, Commented Jul 25, 2012 at 10:08
Yes, If the caller doesn't fill the object he has to get an exception — CrBruno
– CrBruno, Commented Jul 25, 2012 at 10:09

podiluska · Accepted Answer · 2012-07-25 10:11:43Z

4

Your try block should be something like

try 
{ 
    if( XmlDoc == null) 
    {
        throw new ArgumentNullException("XmlDoc");
    } 
    // carry on processing here.
}

answered Jul 25, 2012 at 10:11

podiluska

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