C#: How do I sort an array list of objects by a specific parameter?

Question

I have a basic array list of objects. It accepts a string, a double, a double and a string. I need to sort the list by the final string. How do I sort this array list by typeIn which is a string?

private void button1_Click(object sender, EventArgs e)
        {
            nameIn = textBox1.Text;
            lengthIn = Double.Parse(textBox2.Text);
            weightIn = Double.Parse(textBox3.Text);
            typeIn = textBox4.Text;

            Bird newBird = new Bird(nameIn, lengthIn, weightIn, typeIn);

            birdList.Add(newBird);

         var sortedList = Bird.birdlist.OrderBy(x => x.Type).ToList();

        }

It does not allow me to order by. The red underline in the error is under Orderby

Possible duplicate of How to Sort a List<T> by a property in the object — Broots Waymb
– Broots Waymb, Commented May 6, 2019 at 16:51
There's a little uncertainty from the terms you're using. Sorting and grouping are two different things. — Scott Hannen
– Scott Hannen, Commented May 6, 2019 at 16:51
When you say a "basic array list of objects" what do you mean? ArrayList or a List<object>, or a List<Bird>?? — littlerufe
– littlerufe, Commented May 6, 2019 at 17:24
Are you sure that the birdList.Add() is the same list as Bird.birdlist.OrderBy()? is it a static field of the class Bird? — Jeroen van Langen
– Jeroen van Langen, Commented May 6, 2019 at 18:55

Prasad Telkikar · Accepted Answer · 2019-05-06 16:50:34Z

2

You can try OrderBy() Linq. OrderBy sorts elements in ascending order.

var sortedList = birdList.OrderBy(x => x.TypeIn).ToList();

Here I considered TypeIn is a property with string as a datatype

answered May 6, 2019 at 16:50

Prasad Telkikar

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6 Comments

dusk42 Over a year ago

I have tried but I keep getting the error: CS1061. My array list is in the class that has the constructor and when I try your solution, it red underlines orderby

Prasad Telkikar Over a year ago

What error you are facing.. please update your question with error and what you tried so far

Prasad Telkikar Over a year ago

why Bird.birdlist? is it static..? what is error please mention error? red line indicates compile time error

dusk42 Over a year ago

Yes, I have declared the birdlist in the Bird class as public static ArrayList birdlist = new ArrayList();. The error: 'ArrayList' does not contain a definition for 'OrderBy' and no accessible extension method 'OrderBy' accepting a first argument of type 'ArrayList' could be found (are you missing a using directive or an assembly reference?)

dazedandconfused Over a year ago

Have you put "using System.Linq" at the top of your file?

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