C# elementatordefault() - is it possible to set your own default

Question

1.00/5 (1 vote)

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I'm using

ElementAtOrDefault()

and I want to set my own default value

What I have tried:

Something like this:

string[] list_of_strings ={"ala", "ma","mala" }
set default="something"
string q =list_of_strings.ElementAtOrDefault(0)
string x =list_of_strings.ElementAtOrDefault(1)
string y =list_of_strings.ElementAtOrDefault(2)
string z =list_of_strings.ElementAtOrDefault(3)
Console.Write(q + Environment.NewLine);
Console.Write(x + Environment.NewLine);
Console.Write(y + Environment.NewLine);
Console.Write(z + Environment.NewLine);

Output:
ala
ma
mala
something

Is it possible?

Posted 28-Sep-20 6:14am

aksimoN

Updated 15-Nov-20 23:51pm

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Comments

F-ES Sitecore 28-Sep-20 12:45pm

You'd have to write your own extension method as the one you're using doesn't support that.

aksimoN 28-Sep-20 15:43pm

tnx

3 solutions

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Richard MacCutchan · Accepted Answer · 2020-09-28T06:18:00

Solution 1

See Enumerable.ElementAtOrDefault<TSource>(IEnumerable<TSource>, Int32) Method (System.Linq) | Microsoft Docs[^]

Posted 28-Sep-20 6:18am

Richard MacCutchan

Comments

aksimoN 28-Sep-20 12:52pm

There's nothing about setting default value

Richard MacCutchan 28-Sep-20 14:37pm

The sample code shows how.

aksimoN 28-Sep-20 15:42pm

The sample code shows only what happend when index is out of range. There is nothing about setting diffrent default value

Richard MacCutchan 29-Sep-20 3:24am

Quote:The default value for reference and nullable types is null.

Richard MacCutchan 29-Sep-20 3:26am

You can also implement IList<T>.Item[Int32] Property (System.Collections.Generic) | Microsoft Docs[^] in your own class and set a default value for the Item[] property.

BillWoodruff · Accepted Answer · 2020-09-28T18:51:00

Solution 2

Marc Gravell (StackOverFlow) published useful generic extension methods for this years ago: [^].

Posted 28-Sep-20 18:51pm

BillWoodruff

aksimoN · Accepted Answer · 2020-11-15T23:51:00

Solution 3

I was looking for something like this:

string abc = List_of_strings[4].name ?? "something";

It's working perfect for me because when you ask about a object that doesn't exist you will get "NONE" instead of error.

Posted 15-Nov-20 23:51pm

aksimoN

Updated 15-Nov-20 23:52pm

v2

Comments

Richard Deeming 16-Nov-20 6:20am

If List_of_strings doesn't contain five elements, you will still get an error.

If List_of_strings[4] returns null, you will still get an error.

aksimoN 17-Nov-20 3:23am

I'm using something like this:

cmd.Parameters.Add("@state", SqlDbType.NVarChar).Value = member?.state ?? "none";

and it's working for me, where member.state has no value.