Component {Parameters} in Blazor

Introduction

Blazor is a relatively new web framework created by Microsoft that enables developers to build web applications using C# instead of JavaScript. It uses web standards and allows for creating interactive, single-page applications (SPAs) that run on the client or server sides.

One of the key features of Blazor is its component-based architecture, which allows for creation of reusable UI elements that can be easily managed and customized. In this article, we will focus on component parameters in Blazor and how they can be used to create more flexible and reusable components.

What are the component parameters in Blazor?

Component parameters are values passed into a Blazor component, allowing it to be customized and reused in different parts of an application. In Blazor, a component can have any number of parameters. They can be of different types, including primitive types (int, string, bool, etc.), complex types (classes or structures), or other components.

How can we pass parameters to a Blazor component?

Let’s look at a simple example to understand how to use parameters in a Blazor component. We will create a component that displays a person’s name, age, and address and allows these values to be customized using parameters.

First, let’s create a new Blazor component called “PersonComponent”. To do this, we will create a new file called “PersonComponent.razor” in the “Pages” folder of our Blazor project and add the following code:

<h1>Person Information</h1>
<p>Name: @Name</p>
<p>Age: @Age</p>
<p>Address: @Address</p>

This component uses three HTML paragraphs to display a person’s name, age, and address. Notice that we are using “@Name”, “@Age”, and “@Address” to display the values of these parameters.

Next, let’s add parameters to our component. To do this, we will add the following code to our component:

@code {
    [Parameter]
    public string Name { get; set; }
    [Parameter]
    public int Age { get; set; }
    [Parameter]
    public string Address { get; set; }
}

In this code, we are defining three parameters for our component: “Name”, “Age”, and “Address”. The “[Parameter]” attribute tells Blazor that these properties should be treated as parameters. When we use this component in our application, we can pass values for these parameters and customize the component’s behavior.

Using the component in our application

To use our new “PersonComponent” in our application, we can add the following code to any other component:

<PersonComponent Name="John Smith" Age="42" Address="123 Main St." />

This code creates a new instance of our “PersonComponent” and sets the “Name”, “Age”, and “Address” parameters to specific values. When we run our application, we will see our “PersonComponent” with the values we provided:

Person Information
Name: John Smith
Age: 42
Address: 123 Main St.

This way, we can create flexible, reusable components that can be customized and reused throughout our application.

Conclusion

Component parameters are an essential feature of Blazor that allows developers to create flexible, reusable components. Using parameters, we can create easily customized and reused components in different parts of our application. In this article, we demonstrated how to create a simple component with parameters and how to use it in our application. By leveraging component parameters, we can create more efficient, maintainable, and scalable web applications using Blazor.