how to return a list in c#?

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C#

List<sfdclistinfo> IstsfdcInfo = new List<sfdclistinfo>();

i need to return the list if it contains data and bind them to datagridview

[edit]Code block added - OriginalGriff[/edit]

Posted 1-Apr-15 23:40pm

Member 10371894

Updated 2-Apr-15 0:30am

OriginalGriff

v3

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Mehdi Gholam 2-Apr-15 5:48am

A list of what and to where?

StM0n 2-Apr-15 5:49am

One List to bind them all ;)

Andy Lanng 2-Apr-15 6:21am

Rofl ^_^

StM0n 2-Apr-15 5:49am

Are you aware of the fact, that there's no List-Class... only the generic List<t>?

Sinisa Hajnal 2-Apr-15 6:11am

What have you tried? Returning the list from where? Please clarify.

Maciej Los 2-Apr-15 6:22am

List<T> means that List is a list of T class. So, the member of list is T class, it's a collection of T class ;)
Please, clarify your issue...

Andy Lanng 2-Apr-15 6:35am

Please see the solution. It answers a more broad issue but there are details on how to see if it contains items

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Andy Lanng · Answer 1 · 2015-04-02T00:32:00

First:

List are a generic type. In other words they must be a list of something. You need to tell it what that something is:

C#

//List<t> list = new List<t>() where T is a Type.

List<int> intList = new List<int>(); //a List of integers

intList.Add(1);  // add integer to the list
intList.Add(256);

if(intList.Any()) // a linq way of saying intList.Count()>0
 Console.WriteLine(intList.Count());

//out:> 2

The list Type can be any type. I used a primitive here but they are often used for storing complex and user defined types.

Alternatives to List include, but are not limited to:

C#

//Array
int[] intArray = new int[2]; // creates an array of ints but it has a fixed size (2).
//Dictionary
Dictionary<int,string> = new Dictionary<int,string>(); //very different usage.

This type stores a key(int) that is used to access its value(string).

All of these collections are generic and cannot be instanciated without being specified with a type (ok, so Arrays are a little different but the still must be typed).

For more information on generics please see this link
An Example of Generics Using C# in ASP.NET[^]

OriginalGriff · Answer 2 · 2015-04-02T00:35:00

That list won't contain data - it just creates a new, empty list.
If you want to add items to it (from some source) then it's very, very easy to use it with a DataGridView:

C#

public class ProdTotalSales
    {
    public string Text { get; set; }
    public int Value { get; set; }
    private string Hidden { get; set; }
    public ProdTotalSales(string s, string h, int i)
        {
        Text = s;
        Hidden = h;
        Value = i;
        }
    }

C#

ProdTotalSales p1 = new ProdTotalSales("P1", "p1 hidden", 1);
ProdTotalSales p2 = new ProdTotalSales("P2", "p2 hidden", 2);
List<prodtotalsales> list = new List<prodtotalsales>() { p1, p2 };
myDataGridView.DataSource = list;

Will give you a DataGridView with two columns (one for each public property in the class) and two rows (one for each instance of the class in the List).

how to return a list in c#?

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