How to read the current value of an input in the OnKeyPress event?

To read the current value of an input using @onkeypress event, this event uses the KeyboardEventArgs. You can also get the last pressed key value in args.Key.

[index.razor]

@page"/"

<input type="text" @onkeypress="@Keypress" />
<h1>@KeyPressed</h1>

@code {
    string KeyPressed = "";
    private void Keypress(KeyboardEventArgs args)
    {
        KeyPressed = "Key Pressed is " + args.Key;
    }
}