记录一个assembly: Dependency造成的错误。

using System;
using Xamarin.Forms;
using AdminTools.Services;
using WorkingWithWebview.Android;
using Android.Widget;

using Plugs.Droid;

[assembly: Dependency(typeof(Toast_Android))]
//[assembly: Dependency(typeof (Toast_Android),LoadHint.Default)]

namespace Plugs.Droid
{
    class Toast_Android : IToast
    {
        public void LongAlert(string message)
        {
            Toast.MakeText(Android.App.Application.Context, message, ToastLength.Long).Show();
        }
        public void ShortAlert(string message)
        {
            Toast.MakeText(Android.App.Application.Context, message, ToastLength.Short).Show();
        }
    }
}