86 lines
2.7 KiB
C#
86 lines
2.7 KiB
C#
using System;
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using System.Diagnostics;
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using System.Text;
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using NLog;
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using Prism.Events;
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using Prism.Regions;
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using RIZO_Application.Core;
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using RIZO_Application.Core.Mvvm;
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namespace RIZO_Application.Modules.LogModule.ViewModels
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{
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public class SystemLogViewModel : RegionViewModelBase
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{
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private readonly IEventAggregator _eventAggregator;
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private SubscriptionToken _token;
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private readonly StringBuilder _logMessageBuilder = new StringBuilder();
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private Logger _logger = LogManager.GetCurrentClassLogger();
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private const int MaxLogLength = 1000; // 假设最大长度为1000，可以根据实际情况调整
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private const string LogFormat = "\n{0}: {1}";
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// 定义一个日志更新事件
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public event EventHandler LogUpdated;
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public string LogMessage
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{
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get { return _logMessageBuilder.ToString(); }
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set
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{
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_logMessageBuilder.Clear();
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_logMessageBuilder.Append(value);
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RaisePropertyChanged(nameof(LogMessage));
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}
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}
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public SystemLogViewModel(
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IRegionManager regionManager,
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IEventAggregator eventAggregator)
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: base(regionManager)
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{
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OnLogReceived("初始化日志系统");
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_eventAggregator = eventAggregator;
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// 订阅事件，使用UI线程处理，保持强引用
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_token = _eventAggregator.GetEvent<SystemLogEvent>().Subscribe(OnLogReceived, ThreadOption.UIThread, true);
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}
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private void OnLogReceived(string message)
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{
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string newLog = string.Format(LogFormat, DateTime.Now, message);
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_logMessageBuilder.Append(newLog);
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if (_logMessageBuilder.Length > MaxLogLength)
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{
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// 计算需要截取的位置，保留最新的日志
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int startIndex = Math.Max(0, _logMessageBuilder.Length - MaxLogLength);
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_logMessageBuilder.Remove(0, startIndex);
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}
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RaisePropertyChanged(nameof(LogMessage));
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_logger.Info(newLog);
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// 触发日志更新事件
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OnLogUpdated();
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}
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protected virtual void OnLogUpdated()
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{
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LogUpdated?.Invoke(this, EventArgs.Empty);
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}
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public void Destroy()
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{
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_token?.Dispose();
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}
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public void AddTestLogMessage()
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{
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// 示例实现，可根据需求修改
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OnLogReceived("测试日志消息");
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}
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public override void OnNavigatedTo(NavigationContext navigationContext)
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{
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//do something
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}
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}
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} |