Web-Development-with-Blazor-Second-Edition/Chapter03/MyBlog/BlazorServer/Pages/CounterWithoutRazor.cs

using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Rendering;
using Microsoft.AspNetCore.Components.Web;

namespace BlazorServer.Pages
{
    [Route("/CounterWithoutRazor")]
    public class CounterWithoutRazor: ComponentBase
    {
        protected override void BuildRenderTree(RenderTreeBuilder builder)
        {
            builder.AddMarkupContent(0, "<h1>Counter</h1>\r\n\r\n");
            builder.OpenElement(1, "p");
            builder.AddContent(2, "Current count: ");
            builder.AddContent(3,currentCount);
            builder.CloseElement();
            builder.AddMarkupContent(4, "\r\n\r\n");
            builder.OpenElement(5, "button");
            builder.AddAttribute(6, "class", "btn btn-primary");
            builder.AddAttribute(7, "onclick", EventCallback.Factory.Create<MouseEventArgs>(this,IncrementCount));
            builder.AddContent(8, "Click me");
            builder.CloseElement();
        }

        private int currentCount = 0;
        private void IncrementCount()
        {
            currentCount++;
        }
        
    }
}