What is the best way to manage currency?

[JosephHerreraDev]

I currently have this component that formats the output of the number the user typed, from what I understand is the most accepted solution, but how can I prevent the user from typing in letters?

@using System.Globalization

<FluentTextField 
    style="width: 100%;"
    Label="@Label"
    Value="@displayValue"
    ValueChanged="OnTextChanged"
    AutoComplete="off"
    Disabled="@Disabled"
    Placeholder="$0.00" />

@code {
    [Parameter] public string Label { get; set; } = string.Empty;
    [Parameter] public decimal? Value { get; set; }
    [Parameter] public EventCallback<decimal?> ValueChanged { get; set; }
    [Parameter] public bool Disabled { get; set; }

    private string displayValue => Value?.ToString("c") ?? string.Empty;

    private async Task OnTextChanged(string text)
    {
        if (decimal.TryParse(text, NumberStyles.Currency, CultureInfo.CurrentCulture, out var parsed))
            await ValueChanged.InvokeAsync(parsed);
        else
            await ValueChanged.InvokeAsync(null);
    }
}

[MBNSoftware]

Without having tried, I would remove the last char of the string if it's not a digit before trying to parse it.

Something like if (char.IsDigit(text[^1])) { parse the string } else { do something else but do not add the char to the string }

Edit : this implies that you set the Immediate parameter to true, so that you can control each typed char as soon as it's typed.