Check node exists before applying where and select clause XML LINQ

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Hi Friends,
My requirement is to check the node is available or not before applying where and select clause.in my code i am checking value is null or not. But in some XML the element itself missing. Can anyone help to modify the code to meet my requirement.
Thanks in advance

C#

public static List<AccruedClass> validaccrued(string  xmlstring)
{
var filtercondition = new string[] {"COR", "GVT", "MUN"};
XDocument doc = XDocument.Parse(xmlstring);
var ac = doc.Root.Descendants("Positions")
.Where(item =>
{
float? accInt = (float?)item.Element("AccruedInterest");
string mod = (string)item.Element("Mod1");
return accInt != null && accInt.Value > 0.0f && mod != null && filtercondition.Contains(mod);
})
.Select(item => new AccruedClass
{
Office = item.Element("Office").Value != null ? item.Element("Office").Value : "0",
Account = item.Element("Account").Value != null ? item.Element("Account").Value : "0",
KeyAccount = item.Element("KeyAccount").Value != null ? item.Element("KeyAccount").Value : "0",
AccountType = item.Element("AccountType").Value != null ? item.Element("AccountType").Value : "",
MSDWSecurityCode = item.Element("MSDWSecurityCode").Value != null ? item.Element("MSDWSecurityCode").Value : "",
Cusip = item.Element("Cusip").Value != null ? item.Element("Cusip").Value : "",
Mod1 = item.Element("Mod1").Value != null ? item.Element("Mod1").Value : "",
AccruedInterest = item.Element("AccruedInterest").Value != null ? Convert.ToDouble(item.Element("AccruedInterest").Value) : 0,
PriceFactor = item.Element("PriceFactor").Value != null ? Convert.ToDouble(item.Element("PriceFactor").Value) : 0,
Quantity = item.Element("Quantity").Value != null ? Convert.ToDouble(item.Element("Quantity").Value) : 0,

})
.ToList()
.OrderBy(o => o.Cusip);

List<AccruedClass> list_accr = ac.ToList<AccruedClass>();
return list_accr;
}

Posted 23-Jul-15 4:44am

jinesh sam

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Richard Deeming · Accepted Answer · 2015-07-23T06:06:00

Use a combination of explicit cast the and null-coalescing operator:

C#

.Select(item => new AccruedClass
{
    Office = (string)item.Element("Office") ?? "0",
    Account = (string)item.Element("Account") ?? "0",
    KeyAccount = (string)item.Element("KeyAccount") ?? "0",
    AccountType = (string)item.Element("AccountType") ?? "",
    MSDWSecurityCode = (string)item.Element("MSDWSecurityCode") ?? "",
    Cusip = (string)item.Element("Cusip") ?? "",
    Mod1 = (string)item.Element("Mod1") ?? "",
    AccruedInterest = (double?)item.Element("AccruedInterest") ?? 0D,
    PriceFactor = (double?)item.Element("PriceFactor") ?? 0D,
    Quantity = (double?)item.Element("Quantity") ?? 0D,
})

If the element / attribute doesn't exist, and the return type is nullable, the explicit cast operator returns null.