Convert from List of string array to List of objects

Question

If I have a simple class that looks like this:

public string Param1 { get; set; }
public string Param2 { get; set; }
public SimpleClass (string a, string b) { Param1 = a; Param2 = b; }

List of string array returned from another class:

var list = new List<string[]> {new[] {"first", "second"}, new[] {"third", "fourth"}};

Is there a more efficient way using C# to end up with List<SimpleClass> without doing something like:

var list1 = new List<SimpleClass>();
foreach (var i in list)
{          
    var data = new SimpleClass(i[0], i[1]);
    list1.Add(data);         
}

Could mean, not creating redundant variables inside foreach, or perhaps a standard library that does such things. — hello
– hello, Commented Oct 18, 2016 at 22:17

rualmar · Accepted Answer · 2016-10-18 22:16:19Z

10

You can use Linq:

var simpleClassList = originalList.Select(x => new SimpleClass(x[0], x[1])).ToList()

answered Oct 18, 2016 at 22:16

rualmar

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1 Comment

Jeppe Stig Nielsen Over a year ago

Yes, or with the very old-fashioned ConvertAll instance method var simpleClassList = originalList.ConvertAll(x => new SimpleClass(x[0], x[1])); where a List<> is returned directly (so no lazy enumerator).

Eins · Accepted Answer · 2016-10-18 22:21:46Z

3

As was said by @rualmar you can use linq. But you also can overload implicit operator. For example

public static implicit operator SimpleClass(string[] arr)
{
    return new SimpleClass(arr[0], arr[1]);
}

and after that you can write this

var list = new List<SimpleClass> { new[] { "first", "second" }, new[] { "third", "fourth" } };

answered Oct 18, 2016 at 22:21

Eins

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1 Comment

hello Over a year ago

Thanks for this answer.

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