自定义 TraceListener 缩进

LogStudy.EventLog/CustomSource.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.Tracing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LogStudy.EventLog
+{
+    public sealed class CustomSource : EventSource
+    {
+        public void OnCommandExecute()
+        { 
+        
+        }
+    }
+}

LogStudy.TraceLog/CustomTraceListener.cs

@@ -7,16 +7,51 @@ using System.Threading.Tasks;
 
 namespace LogStudy.TraceLog
 {
+    /// <summary>
+    /// 自定义跟踪监听器
+    /// </summary>
     public class CustomTraceListener : TraceListener
     {
+        /// <summary>
+        /// 因为重写了Write方法：给进什么的，需要自行处理。否则缩进等设置不起作用
+        /// </summary>
+        /// <param name="message"></param>
         public override void Write(string? message)
         {
-           Console.Write(message);
+            if (message == null || message?.Length == 0)
+            {
+                return;
+            }
+
+            //处理缩进
+            var preText = string.Empty;
+            if (base.NeedIndent)
+            {
+                preText += new string(' ', base.IndentLevel * base.IndentSize);
+            }
+
+            Console.Write($"{preText}{message}");
         }
 
+        /// <summary>
+        /// 因为重写了Write方法：给进什么的，需要自行处理。否则缩进等设置不起作用
+        /// </summary>
+        /// <param name="message"></param>
         public override void WriteLine(string? message)
         {
-            Console.WriteLine(message);
+            if (message == null || message?.Length == 0)
+            {
+                return;
+            }
+
+            //处理缩进
+            var preText = string.Empty;
+            if (base.NeedIndent)
+            {
+                preText += new string(' ', IndentLevel * IndentSize);
+            }
+
+            Console.WriteLine($"{preText}{message}");
         }
     }
 }

LogStudy.TraceLog/Program.cs

@@ -3,10 +3,11 @@ using LogStudy.TraceLog;
 
 Console.WriteLine("======== 跟踪日志学习 ========");
 
-//UseDefaultListener();
+UseDefaultListener();
 
 UseCustomListener();
 
+
 //使用默认监听器
 void UseDefaultListener()
 {
@@ -14,6 +15,8 @@ void UseDefaultListener()
 	var eventTypes = (TraceEventType[])Enum.GetValues(typeof(TraceEventType));
 	var eventId = 1;
 
+	source.Listeners[0].IndentLevel = 1;
+
 	Array.ForEach(eventTypes, it =>
 	{
 		source.TraceEvent(it, eventId++, $"这是一个 {eventTypes} 跟踪日志信息");
@@ -25,16 +28,17 @@ void UseCustomListener()
 {
 	var source = new TraceSource("ConsoleListenerTraceLog", SourceLevels.All);
 	source.Listeners.Clear();
-	source.Listeners.Add(new DefaultTraceListener() { LogFileName="DefaultListenerTrace.log"});
-	source.Listeners.Add(new CustomTraceListener() { IndentSize=8,IndentLevel=3}) ;
 
-	var eventTypes = (TraceEventType[])Enum.GetValues(typeof(TraceEventType));
-	var eventId = 1;
+	var customListener = new CustomTraceListener();
+	var index = source.Listeners.Add(customListener);
 
-	Array.ForEach(eventTypes, it =>
-	{
-		source.TraceEvent(it, eventId++, $"这是一个 {it} 跟踪日志信息");
-	});
+	//放在 source.Listeners.Add 前面设置IndentLevel，add之后就自动归零，不知道什么原因。
+	customListener.IndentLevel = 1;
+	//或者
+    //source.Listeners[index].IndentLevel = 1;
+
+    source.TraceEvent(TraceEventType.Error, 1, $"这是一个 {TraceEventType.Error} 跟踪日志信息");
+	source.TraceInformation("我是TraceInformation");
 }