Blazor Dropdown bind to value

Microsoft.AspNetCore.Components.Forms.InputSelect`1[BlazorApp1.Data.WeatherForecast] does not support the type 'BlazorApp1.Data.WeatherForecast'.
 ---> System.InvalidOperationException: The type 'BlazorApp1.Data.WeatherForecast' does not have an associated TypeConverter that supports conversion from a string. Apply 'TypeConverterAttribute' to the type to register a converter.

Microsoft.AspNetCore.Components.Forms.InputSelect`1[BlazorApp1.Data.WeatherForecast] does not support the type 'BlazorApp1.Data.WeatherForecast'.
 ---> System.InvalidOperationException: The type 'BlazorApp1.Data.WeatherForecast' does not have an associated TypeConverter that supports conversion from a string. Apply 'TypeConverterAttribute' to the type to register a converter.

@page "/counter"
@using Blazor.Extensions
@using BlazorApp1.Data
@inject IHttpContextAccessor HttpContextAccessor;
@inject WeatherForecastService Wfs;

<PageTitle>Counter</PageTitle>

<h1>Counter</h1>

<EditForm Model="@this">
    <InputSelect @bind-Value="this.sf">
        @foreach (var forecast in forecasts)
        {
            <option value=@forecast>@(forecast.TemperatureC)</option>
        }
    </InputSelect>
</EditForm>

@sf


@code {
    private WeatherForecast[] forecasts;
    public WeatherForecast sf { get; set; }

    protected override async Task OnInitializedAsync()
    {
        forecasts = await Wfs.GetForecastAsync(DateTime.Now);
    }
}

@page "/counter"
@using Blazor.Extensions
@using BlazorApp1.Data
@inject IHttpContextAccessor HttpContextAccessor;
@inject WeatherForecastService Wfs;

<PageTitle>Counter</PageTitle>

<h1>Counter</h1>

<EditForm Model="@this">
    <InputSelect @bind-Value="this.sf">
        @foreach (var forecast in forecasts)
        {
            <option value=@forecast>@(forecast.TemperatureC)</option>
        }
    </InputSelect>
</EditForm>

@sf


@code {
    private WeatherForecast[] forecasts;
    public WeatherForecast sf { get; set; }

    protected override async Task OnInitializedAsync()
    {
        forecasts = await Wfs.GetForecastAsync(DateTime.Now);
    }
}