Imports in Blazor WebAssembly with C# @using

Most often than not, you’ll need to use functionalities from .net libraries in your Blazor WebAssembly applications. In that case, you’ll need to import them via the C# @using directive.

Let’s say you need to use the Debug.WriteLine() method in your Blazor component:

Debug.WriteLine("Hello Blazor!");

You need to import System.Diagnostics with the C# @using directive as follows:

@using System.Diagnostics

If you need to use the method across multiple Blazor components, you can put the import line above in the _Imports.razor file.