Asp net core blazor cascading parameters

ASP.NET Core Blazor is a web framework that allows developers to build web UIs using C# instead of JavaScript. One of the key features of Blazor is cascading parameters, which enable the sharing of data in a hierarchical manner.

Cascading parameters in Blazor allow a value to be passed from a parent component to its child components, and even further down the component tree if necessary. This can be useful when you have a common piece of data that needs to be accessed by multiple components.

To demonstrate how cascading parameters work in Blazor, let's consider a simple example. Suppose we have a parent component “Counter” that displays a counter value, and a child component called “DisplayCounter” that displays the counter value from the parent component.

First, let's define the Counter component:


@page "/counter"

Counter: @counter

@code { private int counter = 0; private void IncrementCounter() { counter++; } }

In this component, we have a counter variable that starts at 0. When the “Increment” is clicked, the counter value is incremented by 1.

Now, let's define the DisplayCounter component:


Counter Value: @CounterValue

@code { [] public int CounterValue { get; set; } }

In this component, we have a CounterValue property that is decorated with the [Parameter] attribute. This indicates that the value of this property will be provided by a parent component.

Now, let's modify the Counter component to pass the counter value to the DisplayCounter component:

Counter.razor ()

@page "/counter"

Counter: @counter

@code { private int counter = 0; private void IncrementCounter() { counter++; } }

In this updated Counter component, we have added the component and passed the counter value using the CounterValue attribute.

Now, when the counter value is incremented in the Counter component, the updated value will be automatically propagated to the DisplayCounter component, and the counter value will be displayed.

Cascading parameters in Blazor provide a convenient way to share data between components in a hierarchical manner. By using the [Parameter] attribute, you can easily pass values from parent components to child components, enabling seamless communication and data sharing your Blazor application.

In conclusion, ASP.NET Core Blazor's cascading parameters feature is a powerful tool for building interactive web UIs using C#. By leveraging cascading parameters, you can easily share data between components and dynamic and responsive web applications.

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