Notice, we are able to reference the library's custom classes and methods, even though they are outside of the namespace of our current project. using FileIOLibrary įollowing is an example of a client-side application that uses the class library we previously wrote. You will declare the reference using the name of the library's namespace. Once you have successfully added a reference to the class library, simply include it via a using directive. If the class library is in the same solution as your current project, you will find it in the Projects > Solution pane. Using (StreamReader file = new StreamReader(filePath)) Private string ReadSpecificLine(string filePath, int lineNumber)
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Return ReadSpecificLine(filePath, lineNumber) Public string ReadLine(string filePath, int lineNumber) Add the following code to your library's. The class library project layout looks similar to what you expect from a typical C# project. In this tutorial, you will build off that example by creating a class library, called FileIOLibrary. In a previous tutorial, you wrote a method to read a specific line number from a text file. To create a C# class library project from the New Project dialog, ( File > New > Project.), select the Class Library (.NET Core) project type. You can also distribute your class library through package management repositories or through open-source projects to allow other developers to use the functions you have created. By referencing this DLL file in your other projects, you will be able to use the classes and methods contained within.
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This package contains code, like classes and methods, that you find useful enough to use across multiple applications. What is a Class Library?īy creating a C# class library, you are creating a package that can be included in your projects.
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Do you find yourself writing code that you would like to reuse across multiple C# projects? In this tutorial, you will learn how to create a class library and add a reference to it in your projects.