How do I create RenderFragment from code in Blazor?

RenderFragment is used to render components or content at run time in Blazor. The RenderFragment class allows you to create the required content or component in a dynamic manner at runtime. In the following code example, the content is created at runtime on OnInitialized.

[Index.razor]

@page "/"

@childContent

@code {
    private string textContent = "Welcome to your new Blazor app.";
    private RenderFragment childContent { get; set; }

    private RenderFragment AddContent() => builder =>
    {
        builder.AddContent(1, textContent);
    };

    protected override void OnInitialized()
    {
        childContent = AddContent();
    }
}

Refer to “ASP.NET Core Blazor templated components” for more details.