blazor-server-sideasp.net-blazor

How to render content inside a razor component in blazor?


With tag helpers you could define an area where you could easily write content. For example, i could make a bootstrap card tag helper and easily render whatever i want inside the card body tag. With razor components how can i achieve this?

<div class="card">
    <div class="card-header"></div>
    <div class="card-body">

        @*render content here*@

    </div>
</div>

Solution

  • Templated components can be implemented using a class called RenderFragment. They are implement same like a parameter property but they capture the content declared inside the component tags.

    Below is an example from the default Blazor project. I updated the SurveyPrompt component to take in the question content like this

    <div class="alert alert-secondary mt-4" role="alert">
        <span class="oi oi-pencil mr-2" aria-hidden="true"></span>
        <strong>@Title</strong>
    
        <span class="text-nowrap">
           @ChildContent
            <a target="_blank" class="font-weight-bold" href="https://go.microsoft.com/fwlink/?linkid=2127996">brief survey</a>
        </span>
    </div>
       
    @code {
        [Parameter]
        public string Title { get; set; }
    
        [Parameter]
        public RenderFragment ChildContent { get; set; }
    }
    

    Here is how i pass the content to the Survey component

    <SurveyPrompt Title="How is Blazor working for you?">
         <i class="carousel-control-next-icon"></i>Please take our survey below
    </SurveyPrompt>
    

    You can also have the RenderFragment typed, read more about it here: https://learn.microsoft.com/en-us/aspnet/core/blazor/templated-components?view=aspnetcore-3.1