Question

var d = get(x).Title;
var e = get(y).Title;

The getting of Title gives an exception if get(y) returns null. However what I need is for e to be null if get(y) is null and there to be no exception generated. I can do this with two steps of get(y) but I want to only do the get(y) one time.

Is there some easy one line way that I can with just one get(y) and with one line of code set e to null if get(y) is null or the actual value if get(y) does not return a null?

Answer 1

var z = get(y);
var e = z != null ? z.Title : null;

You can also use extension methods like those:

    public static TResult IfNotNull<T, TResult>(this T obj, Func<T, TResult> selector)
        where T : class
    {
        return obj.IfNotNull(selector, default(TResult));
    }

    public static TResult IfNotNull<T, TResult>(this T obj, Func<T, TResult> selector, TResult valueIfNull)
        where T : class
    {
        if (obj == null)
            return valueIfNull;
        return selector(obj);
    }

...

    var e = get(y).IfNotNull(_ => _.Title);