best way to check null exception in LINQ

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Hi Friends,
I need to know is there any better option in the LINQ to perform this check

AccruedInterest = item.Element("AccruedInterest").Value != null ? Convert.ToDouble(item.Element("AccruedInterest").Value) : 0,

2nd Question
I need to do some multiplication inside the select statement. Can i use the variable which define the column name.
Please have a look into the code.
Please shed some lights on to solve the issue.
Thanks in advance

C#

.Select(item => new AccruedClass
{
Cusip = item.Element("Cusip").Value != null ? item.Element("Cusip").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,
//CalcAcc =  AccruedInterest * PriceFactor * Quantity    // i need this calculation here. whats the best way?
})

Posted 17-Jul-15 20:43pm

jinesh sam

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OriginalGriff · Accepted Answer · 2015-07-17T20:55:00

Solution 1

Why not calculate it in a property in your AccruedClass on demand?

C#

public class AccruedClass
   {
   ...
   public double CalcAcc { get { return AccruedInterest * PriceFactor * Quantity; } }
   }

That way it always returns the current value, even if the Quantity is changed after construction?

Posted 17-Jul-15 20:55pm

OriginalGriff

Comments

jinesh sam 18-Jul-15 3:10am

Thanks this helps for me. What about null check is there any other option

OriginalGriff 18-Jul-15 3:31am

Well - there is the null coalescing operator:
https://msdn.microsoft.com/en-us/library/ms173224.aspx