Blazor Cascading parameters or a shared service

To implement this in Blazor, we need a shared state that both C2 and Cx can access and modify, enabling changes in one to reflect in the other. This can be done through cascading parameters or a shared service.

Here's how you can implement this scenario:

Solution Using Cascading Parameters

 

@page "/parent"
<h3>Parent Component (P1)</h3>

<CascadingValue Value="SharedState">
    <C1Component />
    <CxComponent />
</CascadingValue>

@code {
    private SharedState SharedState = new SharedState();
}

C#

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Explanation

1. Shared State (SharedState):

   • A simple class (SharedState) is created to hold the state of the checkbox (C2Checked).
   • This state is shared among components.

2. Parent Component (P1):

   • A SharedState instance is created in P1.
   • This instance is passed to child components via CascadingValue.

3. Child Component 2 (C2Component):

   • C2 updates the SharedState.C2Checked property when its checkbox value changes.

4. Child Component Cx (CxComponent):

   • Cx binds its checkbox to the same SharedState.C2Checked property.
   • Any changes in C2 are automatically reflected in Cx due to two-way binding.

5. Cascading Parameters:

   • Both C2Component and CxComponent receive the SharedState object through [CascadingParameter].
   • This ensures the same instance of the state is used by all components.