The name ‘RegisteredFunction’ does not exist in the current context in Blazor.

Solution:

‘RegisteredFunction’ does not exist anymore from Blazor v0.5.0.

JavaScript code

function JSMethod() {
   document.getElementById('demop').innerText = "JavaScript Method invoked";
}

Blazor code

@page "/jsinterop"
@inject IJSRuntime JsRuntime;


@code {
    protected void CallJSMethod()
    {
        JSRuntime.InvokeAsync<bool>("JSMethod");
    }
}