CODEWITHSUNDEEP
c#linq
A.Oreo
A.Oreo

Reputation: 321

How to change one of the property linq

I want to use linq to change one of the property in my list, but this didn't work, do not create a new variable(this is a simple example, actual List have many properties)

List<string> aaa = new List<string>()
        {
            "a", "b"
        };

        aaa.Where(o => o == "b").Select(o => {
            o = "c";
            return o;
        } ).ToList();

Upvotes: 0

Views: 79

Answers (2)

Patrick Hofman
Patrick Hofman

Reputation: 156988

LINQ is a query language, you can 'ask' things, but it is hard to modify something using LINQ. And you shouldn't do that.

Changing an objects state in an enumerator is usually a bad thing, so consider to use a foreach loop.

If you want to change the output, rather than the actual elements, you can do this:

var list = aaa.Select(o => o == "b" ? "c" : o).ToList();

Upvotes: 6

Petre Ionescu
Petre Ionescu

Reputation: 194

Try:

List<string> aaa = new List<string>()
        {
            "a", "b"
        };

aaa = aaa.Select(o => {
            return o == "b" ? "c" : o
        }).ToList();

Upvotes: 0

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