Creating a List<String> in Android Xamarin

Question

I'm building an android application where I need to create a simple list of String items, which i will then add a specific control for each item in the list.

This is the list I want to create:

List<String> projects = new List<String>(); // How?

The code I was trying:

String projects = new string[] { "hey","yo","app","xamarin","c","xaml" };

I need to count the items, something like this:

int amount = projects.Count(); // Can I do this?

Then adding the controls for each item in the list

// Add the tiles, one by one
for (int i = 0; i < amount; i++)
{
  // Inflate the tile
  var tile = LayoutInflater.Inflate (Resource.Layout.Tile, null);

  // Set its attributes
  tile.FindViewById<TextView> (Resource.Id.projectName).Text = currentProject;

  // Add the tile
  projectScrollView.AddView (tile);
}

"currentProject" string is retrieved from SharedPreferences, just haven't got that far yet

Solution 1

   var projects = new List<String>() { "hey","yo","app","xamarin","c","xaml" };

Solution 2

if you are using the array to store what values you want in your list use the foreach

List<string>project = new List<string>();
string[] projects = { "hey","yo","app","xamarin","c","xaml" };

foreach(string str in projects)
{
   project.Add(str);
}
for (int i = 0; i < projects.Length; i++)
{
  // Inflate the tile
  var tile = LayoutInflater.Inflate (Resource.Layout.Tile, null);

  // Set its attributes
  tile.FindViewById<TextView> (Resource.Id.projectName).Text = currentProject;

  // Add the tile
  projectScrollView.AddView (tile);
}   

// you can get items from your list by using  project.Count, your List<string> instead of projects.Length your array and take information from your list and output your tiles that way

Solution 3

To initialize a List<string> with collection initializer use the below syntax.

List<String> projects = new List<String>(){"hey","yo","app","xamarin","c","xaml"};

Count is not a method it is a property. You need property syntax.

int amount = projects.Count;

Comments

[Magus]

Can't you leave off the new List<String>()? I know the parens at least are extra.

[Sriram Sakthivel]

@Magus yup, that's optional. but I believe it will create an array not list. Except parenthesis rest is required

[Magus]

Except, no, you should use .AddRange and avoid the loop and array resizes.

[Erik]

But the List<String> isn't detected when I type it. Do I need to add a "using" line?

[Ronnie]

What are your "using" right now? hard to say if you have it there if it is unknown.

[Magus]

List<T> is part of System.Collections.Generic

[Erik]

I'm trying to use this code, but "List" isn't found. Just get an error. What import/using is it?

[Birk]

System.Collections.Generic;