CommentPostPanelViewModel.cs

using Common;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using System;
using System.Windows;
using System.Windows.Input;

namespace PeriscopeSitePlugin
{
    class CommentPostPanelViewModel : ViewModelBase
    {

        private bool _canPostComment;
        public bool CanPostComment
        {
            get { return _canPostComment; }
            set
            {
                if (_canPostComment == value) return;
                _canPostComment = value;
                RaisePropertyChanged();
            }
        }
        public ICommand PostCommentCommand { get; }
        private async void PostComment()
        {
            if (CanPostComment)
            {
                CanPostComment = false;
                var commentTemp = Comment;
                Comment = "";
                try
                {
                    await _commentProvider.PostCommentAsync(commentTemp);
                }
                catch (Exception ex)
                {
                    _logger.LogException(ex, "", $"Comment={commentTemp}");
                    Comment = commentTemp;
                }

                CanPostComment = true;
            }
        }
        private string _comment;
        private readonly PeriscopeCommentProvider2 _commentProvider;
        private readonly ILogger _logger;

        public string Comment
        {
            get { return _comment; }
            set
            {
                if (_comment == value) return;
                _comment = value;
                RaisePropertyChanged();
            }
        }
        public CommentPostPanelViewModel(PeriscopeCommentProvider2 commentProvider, ILogger logger)
        {
            _commentProvider = commentProvider;
            _logger = logger;
            //_commentProvider.LoggedInStateChanged += (s, e) =>
            //{
            //    CanPostComment = _commentProvider.IsLoggedIn;
            //    if (!CanPostComment)
            //    {
            //        Comment = "未ログインのためコメントできません";
            //    }
            //    else
            //    {
            //        Comment = "";
            //    }
            //};
            PostCommentCommand = new RelayCommand(PostComment);
        }
        public CommentPostPanelViewModel()
        {
        }
    }
}