How to get multiple values from dictionary

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Posted 1-Nov-21 1:02am

Amit Patel1985

Updated 1-Nov-21 1:48am

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[no name] 1-Nov-21 10:28am

Like this var itmesByKeyList= d1Keys.Where(k => fields.ContainsKey(k)).Select(k => fields[k]);

Richard MacCutchan 1-Nov-21 12:47pm

Thanks, I used your suggestion to improve my answer below.

[no name] 1-Nov-21 12:52pm

And finally your solution is much better ;)

Richard MacCutchan 1-Nov-21 13:08pm

Only because I copied yours. My LINQ skills are not very good.

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Richard MacCutchan · Answer 1 · 2021-11-01T01:48:00

Solution 1

Try this:

C#

var listKey = fields.Keys.ToList();
var d1Keys = listKey.Except(list);
foreach (var item in d1Keys) // for all keys not in the exclusion list
{
    Console.WriteLine($"Key: {item}, Value: {fields[item]}"); // print the value of the key
}

Looking at the LINQ provided by Member 15415060 above, a neater solution would be something more like:

C#

var fields = new Dictionary<string, string>
{
{"2", "34"},
{"3", "45"},
{"4", "56"}
};
string[] listArray = { "2", "5", "6" };

var listKeys = fields.Keys.ToList().Except(listArray);
var values = listKeys.Select(k => fields[k]);
foreach (var item in values)
{
    Console.WriteLine($"item: {item}");
}

Posted 1-Nov-21 1:48am

Richard MacCutchan

Updated 1-Nov-21 6:47am

v4

Comments

Amit Patel1985 1-Nov-21 10:06am

but this require a looping I am wondering is it possible without loop.

Richard MacCutchan 1-Nov-21 11:16am

Well it depends what actual results you want.

PIEBALDconsult 1-Nov-21 11:28am

Of course it loops, it has to loop, either you write the loop yourself (which gives you control) or depend on the loops of others (which may hide all sorts of bad stuff).

[no name] 1-Nov-21 13:09pm

You are right it loops either way, also with e.g. LINQ. But I prefer LINQ because it is already tested thousand of times .

PIEBALDconsult 1-Nov-21 13:11pm

But it is less efficient in many cases. Don't use Linq.

Richard MacCutchan 1-Nov-21 13:12pm

What? I am still trying to learn it.

PIEBALDconsult 1-Nov-21 13:23pm

Aren't you an old dog like me?
I learned just enough to know not to use it.

Richard MacCutchan 1-Nov-21 13:34pm

Actually a very old dog. But I still enjoy learning new skills.

PIEBALDconsult 1-Nov-21 13:51pm

Try juggling, chicks dig it.

Richard MacCutchan 1-Nov-21 15:15pm

Yeah, but then they tell me I remind them of their grandad. :(

PIEBALDconsult 1-Nov-21 15:25pm

I don't see a downside to that.

Richard MacCutchan 1-Nov-21 13:12pm

I prefer LINQ also, but I am not very good at it. More studying needed.

[no name] 1-Nov-21 13:17pm

My LINQ knowledge tends to zero. The above I googled, but at least I tested it also. This simply to learn it one time... maybe...