Define reusable RenderFragments in code in ASP.NET Blazor

@RenderWelcomeInfo

<p>Render the welcome content a second time:</p>

@RenderWelcomeInfo

@code {
    private RenderFragment RenderWelcomeInfo = @<p>Welcome to your new app!</p>;
}

To make RenderTreeBuilder code reusable across multiple components, declare the RenderFragment public and static:

public static RenderFragment SayHello = @<h1>Hello!</h1>;

RenderFragment delegates can accept parameters. The following component passes the message (message) to the RenderFragment delegate:

<div class="chat">
    @foreach (var message in messages)
    {
        @ChatMessageDisplay(message)
    }
</div>

@code {
    private RenderFragment<ChatMessage> ChatMessageDisplay = message =>
        @<div class="chat-message">
            <span class="author">@message.Author</span>
            <span class="text">@message.Text</span>
        </div>;
}

References
https://learn.microsoft.com/en-us/aspnet/core/blazor/performance?view=aspnetcore-7.0#define-reusable-renderfragments-in-code

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