Revision history [back]

Cascading parameters can be utilized in Blazor programming to pass a set of parameters down the component tree. This allows components within the tree to access the same data without needing to pass the data through every component as a parameter.

To use cascading parameters in Blazor, a component can define a cascading parameter using the CascadingValue component. The CascadingValue takes in a parameter value and makes it available to all child components using the CascadingParameter attribute.

For example, suppose we have a Parent component that defines a cascading parameter named Title with the value of "My App" as follows:

<CascadingValue Value="My App" Name="Title">
    <Child1 />
</CascadingValue>

We can then create a Child1 component that uses the Title cascading parameter as follows:

<div>
    <h1>@Title</h1>
</div>

@code {
    [CascadingParameter(Name = "Title")]
    public string Title { get; set; }
}

In this example, the Title property in Child1 is decorated with the CascadingParameter attribute to indicate that it should receive the value of the Title cascading parameter from its parent.

Using cascading parameters can simplify component communication and reduce the amount of code needed to pass data between components.