Unable to call static method in class from another

Question

I have a class file which contains a function to hash an input string.

using System; using System.Security.Cryptography; using System.Linq; using System.Text; using System.Threading.Tasks; namespace XHD_Console { public class HashingSystem { public static string Sha256(string text) { string hashString = string.Empty; //code for hashing here, contains some things i'd rather not release. return hashString; } } }

I want to call the sha256 function from a form, intellisense detects the class HashingSystem, but not the function. Is there a reason? I've read it needs to be static, done that but to no avail. Both classes are in the same namespace, but the class hashingsystem has it's own file, hashingsystem.cs

To call the function:

private void submit_Click(object sender, EventArgs e){ this.EnteredPassword = HashingSystem.sha256(input_Password.Text); this.DialogResult = DialogResult.OK; this.Close(); }

It's just a normal windows C# form, it's for password entry, thus the hash function. — Leo Skingsley
– Leo Skingsley, Commented Aug 24, 2017 at 11:12
If they really are in the same namespace and project it shouldn't matter that they are internal right. — Mark Baijens
– Mark Baijens, Commented Aug 24, 2017 at 11:16
The OP is most likely creating an instance of HashingSystem instead of calling it statically — Camilo Terevinto
– Camilo Terevinto, Commented Aug 24, 2017 at 11:21

mjwills · Accepted Answer · 2017-08-24 11:29:43Z

7

You need to call static members against the class, not against an instance of a class. So you need to use:

HashingSystem.sha256("texthere");

Also, consider changing:

class HashingSystem

to:

public class HashingSystem

Classes are internal by default. I would recommend you always be explicit about visibility (i.e. always specify internal, public or private).

edited Aug 24, 2017 at 11:29

answered Aug 24, 2017 at 11:14

mjwills

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3 Comments

Leo Skingsley Over a year ago

It's public static class, but calling it like HashingSystem.sha256(string) gives me an error; the name 'sha256' does not exist in the current context

mjwills Over a year ago

Please update your post to include the entire method of the calling code, and the actual HashingSystem class (since the HashingSystem class in your post is definitely not public). Also please include a screenshot of the compiler error you are receiving.

Leo Skingsley Over a year ago

There's one class HashingSystem. I have tried making the class public which did not work.

kkakroo · Accepted Answer · 2017-08-24 11:33:07Z

Are you trying to do this?

 HashingSystem hs = new HashingSystem(); hs.sha256("Hello World"); //This wont work as static methods cannot be called via instances

Use the below way instead

 HashingSystem.sha256("Hello world");//Calling directly via class

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