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Override default value of null conditional operator


By : Tim
Date : September 29 2020, 10:00 AM
wish of those help For null you could use the null conditional with null-coalescing operator which would give you a default value;
code :
string abc = mode?.ToLower() ?? "somethingelse";
public static string DefaultIfEmpty(this string str, string defaultValue, bool considerWhiteSpaceIsEmpty = false)
   => (considerWhiteSpaceIsEmpty ? string.IsNullOrWhiteSpace(str) : string.IsNullOrEmpty(str)) ? defaultValue : str;


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Assign a default value when using the NEW Null-Conditional operator shorthand feature in .Net?


By : UaDiamond
Date : March 29 2020, 07:55 AM
it helps some times You can use the Or operator. This operator determines whether the variable is valid, and if it's not, assign the or'ed value.
In your case, you could use:
code :
Dim x = customer.Address.Country Or "No Address"
Dim x = If(customer.Address is nothing, "No Address", customer.Address?.Country)
Dim num = System.Threading.Thread.GetDomainID() Or 0
Console.WriteLine(CStr(num))
Console.Read()

How to create empty-conditional operator for collections similar to null-conditional operator?


By : sahid khan
Date : March 29 2020, 07:55 AM
I wish this helpful for you IMHO, the "most elegent" solution is to re-write MinBy to make it in to a MinByOrDefault
code :
public static TSource MinByOrDefault<TSource, TKey>(this IEnumerable<TSource> source,
    Func<TSource, TKey> selector)
{
    return source.MinByOrDefault(selector, Comparer<TKey>.Default);
}

public static TSource MinByOrDefault<TSource, TKey>(this IEnumerable<TSource> source,
    Func<TSource, TKey> selector, IComparer<TKey> comparer)
{
    if (source == null) throw new ArgumentNullException("source");
    if (selector == null) throw new ArgumentNullException("selector");
    if (comparer == null) throw new ArgumentNullException("comparer");
    using (var sourceIterator = source.GetEnumerator())
    {
        if (!sourceIterator.MoveNext())
        {
            return default(TSource); //This is the only line changed.
        }
        var min = sourceIterator.Current;
        var minKey = selector(min);
        while (sourceIterator.MoveNext())
        {
            var candidate = sourceIterator.Current;
            var candidateProjected = selector(candidate);
            if (comparer.Compare(candidateProjected, minKey) < 0)
            {
                min = candidate;
                minKey = candidateProjected;
            }
        }
        return min;
    }
}

C# Null Conditional Operator alternative (conditional assignment)?


By : g.rbeiz
Date : March 29 2020, 07:55 AM
will help you The C# null-conditional operator allows for useful short circuiting: , The behavior you are expecting:
code :
(unit as RangeUnit).PreferredTarget = UnitType.Melee;
(unit as RangeUnit)?.PreferredTarget = UnitType.Melee;

Can Null-conditional operator (Elvis operator) prevent IndexOutOfRangeException?


By : user26038
Date : March 29 2020, 07:55 AM
like below fixes the issue No, simply because it is a null-conditional operator, not an indexoutofrange-conditional operator.
One way you could work around it is to use the ElementAtOrDefault method that checks for the index and returns null if its out of range.

When using a null conditional operator in a conditional statement, how is the null case handled?


By : biebs
Date : March 29 2020, 07:55 AM
around this issue Say I have the following code here: , In your statement
code :
if (x)
if (x == true)
//or
if (x == false)
int? i = null;
if(i > 0) {...}
if (SomeObj?.Length > 0) 
if ((object)obj == null || obj.Length <= 0)
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