添加项目文件。

SamplePre.Common/LoggerHelper.cs

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+using NLog;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SamplePre.Common
+{
+    /// <summary>
+    /// nLog使用帮助类
+    /// </summary>
+    public class LoggerHelper
+    {
+        /// <summary>
+        /// 实例化nLog，即为获取配置文件相关信息(获取以当前正在初始化的类命名的记录器)
+        /// </summary>
+        private readonly NLog.Logger _logger = LogManager.GetCurrentClassLogger();
+
+        private static LoggerHelper _obj;
+
+        public static LoggerHelper Logger
+        {
+            get => _obj ?? (new LoggerHelper());
+            set => _obj = value;
+        }
+
+        #region Debug，调试
+        public void Debug(string msg)
+        {
+            _logger.Debug(msg);
+        }
+
+        public void Debug(string msg, Exception err)
+        {
+            _logger.Debug(err, msg);
+        }
+        #endregion
+
+        #region Info，信息
+        public void Info(string msg)
+        {
+            _logger.Info(msg);
+        }
+
+        public void Info(string msg, Exception err)
+        {
+            _logger.Info(err, msg);
+        }
+        #endregion
+
+        #region Warn，警告
+        public void Warn(string msg)
+        {
+            _logger.Warn(msg);
+        }
+
+        public void Warn(string msg, Exception err)
+        {
+            _logger.Warn(err, msg);
+        }
+        #endregion
+
+        #region Trace，追踪
+        public void Trace(string msg)
+        {
+            _logger.Trace(msg);
+        }
+
+        public void Trace(string msg, Exception err)
+        {
+            _logger.Trace(err, msg);
+        }
+        #endregion
+
+        #region Error，错误
+        public void Error(string msg)
+        {
+            _logger.Error(msg);
+        }
+
+        public void Error(string msg, Exception err)
+        {
+            _logger.Error(err, msg);
+        }
+        #endregion
+
+        #region Fatal,致命错误
+        public void Fatal(string msg)
+        {
+            _logger.Fatal(msg);
+        }
+
+        public void Fatal(string msg, Exception err)
+        {
+            _logger.Fatal(err, msg);
+        }
+        #endregion
+    }
+}