CODEWITHSUNDEEP
c#static
EKanadily
EKanadily

Reputation: 3977

Functions inside a static class need the name of the class to be called

I have a class named MyFillerClass in the file MyFillerClass.cs like so :

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;

    namespace trial
    {
        public static class MyFillerClass
        {
            public static List<string> returnCategoryNames()
            {
                List<string> catNames = new List<string>();
                catNames.Add("one");
                catNames.Add("two");
                catNames.Add("three");
                catNames.Add("Others");
                return catNames;
            }
        }
    }

now when i want to call it from somewhere else (like a form class) :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace trial
{
    public partial class Form1 : Form
    {
        static string lastSelectedCategory;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            listBox1.DataSource = returnCategoryNames(); //error : The name 'returnCategoryNames' does not exist in the current context
            lastSelectedCategory = listBox1.SelectedValue.ToString();
        }

        private void listBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            lastSelectedCategory = listBox1.SelectedValue.ToString();

            System.Diagnostics.Debug.Print("### User choosed " + lastSelectedCategory + " category");
        }
    }
}

the line "listBox1.DataSource = returnCategoryNames();" produce an error as indicated in the code ,to fix it i have to adjust it to "listBox1.DataSource = MyFillerClass.returnCategoryNames();".

the question is : in a long program that can add a lot of typing ,can i adjust the class MyFillerClass in such a way that i can just call the function like so : returnCategoryNames() ?

Upvotes: 1

Views: 64

Answers (3)

Sharmanuj
Sharmanuj

Reputation: 1

To call a function from a class you need to have an object created for that class then only you can call the method defined in the class.

In case of static class no need to create any object. you have to direct call the method followed by the class name.

In your case MyFillerClass.returnCategoryNames();

Upvotes: 0

Marcel N.
Marcel N.

Reputation: 13976

No, not in C# up to 5.0. You need to prefix the static method name with the class name.

However, in C# 6.0 there will be static using statements available. This new language feature will allow you to access directly static classes methods.

Upvotes: 4

Marcos Lora
Marcos Lora

Reputation: 89

Yo can't do it in C# yet. To do it, you need to do a none static class and none static method.

You can do an extension method.

Upvotes: 2

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