请问在 .NET Core 中如何让 Entity Framework Core 在日志中记录由 LINQ 生成的SQL语句？

Posted 2022-05-10 lyl6796910

using dotNET.Core;

using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;

namespace dotNET.EFCoreRepository

    /// <summary>
    /// ef 日志
    /// </summary>
    public class EFLoggerProvider : ILoggerProvider
    
        public ILogger CreateLogger(string categoryName) => new EFLogger(categoryName);
        public void Dispose()  
    

    /// <summary>
    /// 
    /// </summary>
    public class EFLogger : ILogger
    
        private readonly string categoryName;

        public EFLogger(string categoryName) => this.categoryName = categoryName;

        public bool IsEnabled(LogLevel logLevel) => true;

        public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
        
            //ef core执行数据库查询时的categoryName为Microsoft.EntityFrameworkCore.Database.Command,日志级别为Information
            if (categoryName == "Microsoft.EntityFrameworkCore.Database.Command"
                    && logLevel == LogLevel.Information)
            
                var logContent = formatter(state, exception);
                NLogger.Debug(logContent);
                //TraceMessage("Something happened.");
                //  NLogger.Info(GetCodeLineAndFileName());
                //TODO: 拿到日志内容想怎么玩就怎么玩吧
                Console.WriteLine();
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine(logContent);
                Console.ResetColor();
            
        

        public IDisposable BeginScope<TState>(TState state) => null;


        public void TraceMessage(string message,
                                 [System.Runtime.CompilerServices.CallerMemberName] string memberName = "",
                                 [System.Runtime.CompilerServices.CallerFilePath] string sourceFilePath = "",
                                 [System.Runtime.CompilerServices.CallerLineNumber] int sourceLineNumber = 0)
        
            NLogger.Debug("message: " + message);
            NLogger.Debug("member name: " + memberName);
            NLogger.Debug("source file path: " + sourceFilePath);
            NLogger.Debug("source line number: " + sourceLineNumber);
        

        public string GetCodeLineAndFileName()
        
            StackTrace insStackTrace = new StackTrace(true);
            var insStackFrames = insStackTrace.GetFrames();
            string str = "";
            foreach(var insStackFrame in insStackFrames)
            
                str += String.Format("\nFile: 0, Line: 1\n", insStackFrame.GetFileName(), insStackFrame.GetFileLineNumber());
            
            return str;
        


    

第一步： 添加日志类

第二步：OnConfiguring  方法添加日志调用

   protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        
            var loggerFactory = new LoggerFactory();
            loggerFactory.AddProvider(new EFLoggerProvider());
            optionsBuilder.UseLoggerFactory(loggerFactory);
            base.OnConfiguring(optionsBuilder);