CODEWITHSUNDEEP
c#import
Lucas Baizer
Lucas Baizer

Reputation: 199

Import C# Class

I'm (very) new to C#, and I need to know how to import classes.

In Java, I could just say:

package com.test;
class Test {}

And then in some other class:

package com.test2;
import com.test.Test;

How could I do this in C#?

Upvotes: 9

Views: 62725

Answers (2)

Alaska
Alaska

Reputation: 423

I don't come from a Java background, but I come from a Python, C/C++ background where I always used something like "import" or "#include" and it always felt pretty simple.

But I want to share what I have learned so that others after me don't have to go through the same confusion. To give an example, I am going to show how to create a SHA256 instance.

using System.Security.Cryptography; //this is the namespace, which is what you import; this will be near the top of documentation you read
using static System.Security.Cryptography.SHA256; //this is an additional class inside the namespace that you can use; this will be in the "derived" section of documentation

AlgorithmHash sha = SHA256.Create(); //I am not entirely sure why, but the declaration needs to be on the same line as the instantiation

I have attached the HashAlgorithm documentation for reference: https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.hashalgorithm?view=net-5.0.

Upvotes: -2

Steven Doggart
Steven Doggart

Reputation: 43743

Importing namespaces is accomplished in C# with the using directive:

using com.test;

However, there is no way, currently, to import a class. Importing classes, however is a new feature which is being introduced in C# 6 (which will come with Visual Studio 2015).

In C#, namespaces are the semi-equivalent of Java's packages. To declare the namespace, you just need to do something like this:

namespace com.test
{
    class Test {}
}

If the class is declared in a separate assembly (such as a class library), simply adding the using directive is not enough. You must also add a reference to the other assembly.

Upvotes: 20

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