ChatX/chatclient/Data/ChatDataModel.cs

using System.Windows.Media;
using System.Windows;
using System.Windows.Media.Imaging;
using System.Globalization;
using System.Windows.Data;

namespace chatclient.Data
{
    /// <summary>
    /// 聊天消息类，表示一条消息的内容和显示属性
    /// </summary>
    public class ChatMessage
    {
        /// <summary>
        /// 发送者名称
        /// </summary>
        public required string Sender { get; set; }
        /// <summary>
        /// 消息类型（文本、图片、文件、系统消息等）
        /// </summary>
        public required MessageType MsgType { get; set; } = MessageType.Text;
        /// <summary>
        /// 消息发送者的头像图片
        /// </summary>
        public required BitmapImage Image { get; set; }
        /// <summary>
        /// 消息内容
        /// </summary>
        public required string Content { get; set; }
        /// <summary>
        /// 消息发送时间
        /// </summary>
        public DateTime Timestamp { get; set; }
        /// <summary>
        /// 消息在界面中的对齐方式（左/右）
        /// </summary>
        public HorizontalAlignment Alignment { get; set; } = HorizontalAlignment.Left;
        /// <summary>
        /// 发送者名称的显示颜色
        /// </summary>
        public Brush SenderColor { get; set; } = Brushes.Black;
    }
    public enum MessageType
    {
        Text,
        Image,//图片
        File,//文件
        System//系统信息
    }
    /// <summary>
    /// 临时账户信息类，包含用户名和密码
    /// </summary>
    public class Account
    {
        public string? UserName { get; set; }
        public string? UserPassword { get; set; }
    }
    public class TimeFormatConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is DateTime timestamp)
            {
                // 获取本地时区信息
                TimeZoneInfo localTimeZone = TimeZoneInfo.Local;
                bool isLocalTimeZoneUtcPlus8 = localTimeZone.BaseUtcOffset == TimeSpan.FromHours(8);
                DateTime localTime;
                if (timestamp.Kind == DateTimeKind.Utc)
                {
                    localTime = timestamp.ToLocalTime();
                }
                else if (timestamp.Kind == DateTimeKind.Unspecified)
                {
                    localTime = DateTime.SpecifyKind(timestamp, DateTimeKind.Utc).ToLocalTime();
                }
                else
                {
                    localTime = timestamp;
                }

                var now = DateTime.Now;
                var today = now.Date;
                var yesterday = today.AddDays(-1);
                var localTimeDate = localTime.Date;

                // 格式化时间字符串
                string formattedTime;
                if (localTimeDate == today)
                {
                    formattedTime = localTime.ToString("HH:mm:ss");
                }
                else if (localTimeDate == yesterday)
                {
                    formattedTime = "昨天 " + localTime.ToString("HH:mm");
                }
                else if (localTime.Year == now.Year)
                {
                    formattedTime = localTime.ToString("MM/dd HH:mm");
                }
                else
                {
                    formattedTime = localTime.ToString("yy/MM/dd HH:mm");
                }

                // 仅在非UTC+8时区显示时区信息
                if (!isLocalTimeZoneUtcPlus8)
                {
                    // 获取原始时间的时区信息
                    string timeZoneInfo = timestamp.Kind == DateTimeKind.Utc
                        ? "UTC"
                        : "UTC"+localTime.ToString("zzz");

                    return $"{timeZoneInfo} {formattedTime}";
                }
                return formattedTime;
            }
            return value;
        }
        /// <summary>
        /// 将格式化的时间字符串转换回DateTime对象
        /// </summary>
        /// <param name="value"></param>
        /// <param name="targetType"></param>
        /// <param name="parameter"></param>
        /// <param name="culture"></param>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}