How return empty string, if the result is null

Question

return results.Select(x => new {                
            VillageName = x.VillageName,
            GroupID = x.GroupID,
            GroupName = x.GroupName,
            CenterID = x.CenterID,
            CenterName = x.CenterName,
        }).ToList<object>();

if CenterName and group name is null. Need to return an empty string In c# 6.0, x?.CenterName -> return null value — Prasad Mahanti, Sep 10 '19 at 04:28
I assume the `??` isnt working for you in this scenario? `x?.CenterName ?? ""` — David Pilkington, Sep 10 '19 at 04:31

score 1 · Answer 1 · edited Sep 10 '19 at 05:42

1

You can use the null-coalescing operator

x?.CenterName ?? string.Empty

edited Sep 10 '19 at 05:42

aloisdg

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answered Sep 10 '19 at 05:38

David Pilkington

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anil shrestha · Answer 2 · 2020-05-31T13:13:27.597

You can implement C# ternary (? :) Operator. The syntax of ternary operator is:

Condition ? Expression1 : Expression2;

The Expressions below first checks for null conditions and if the condition is null, the value is set to empty.

return results.Select(x => new {                
            VillageName = x.VillageName,
            GroupID = x.GroupID,
            GroupName = x.GroupName  == null ? "" : x.GroupName,
            CenterID = x.CenterID,
            CenterName = x.CenterName == null ? "" : x.CenterName,
        }).ToList<object>();

or else you can use "The null-coalescing operator(??)" like:

CenterName = x.CenterName ?? "", //check and returns empty string if CenterName is null

This code works well. I am even applying same method but how come people down vote my answer without even analyzing and testing it. Addition of comment for down vote with your reason would be greater. And yes this code works well. — anil shrestha, Sep 10 '19 at 05:53

How return empty string, if the result is null

2 Answers2