How to call onkeydown event in a separate .cs file

Question

I want to handle a onkeydownevent in a separate C# code file. However, I'm always getting this error: CS0428 Cannot convert method group 'KeyHandler' to non-delegate type 'object'. Did you intend to invoke the method?

I'm afraid I'm missing the correct syntax. The target framework is .NET Standard 2.0. Here are my files:

index.razor:

@page "/"
@inherits blazortest.TestBase

<div tabindex="0" @onkeydown=@KeyHandler>
    xxx
</div>

TestBase.cs:

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

namespace blazortest
{
    public class TestBase : LayoutComponentBase
    {
        public void KeyHandler(KeyboardEventArgs e)
        {
            // Do something
        }
    }
}

Answer 1

Your code should be :

@page "/"
@inherits blazortest.TestBase

<div tabindex="0" @onkeydown="KeyHandler">
    xxx
</div>

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

namespace blazortest
{
    public class TestBase : LayoutComponentBase
    {
        public void KeyHandler(KeyboardEventArgs e)
        {
            // Do something
        }
    }
}