Do not force filter switch names with a leading $ in OnFilterSwitchCreated callback

Author: 0xced

README.md

@@ -288,7 +288,7 @@ var logger = new LoggerConfiguration()
     .ReadFrom.Configuration(configuration, options)
     .CreateLogger();
 
-ILoggingFilterSwitch filterSwitch = filterSwitches["$filterSwitch"];
+ILoggingFilterSwitch filterSwitch = filterSwitches["filterSwitch"];
 ```
 
 ### Nested configuration sections

src/Serilog.Settings.Configuration/Settings/Configuration/ConfigurationReader.cs

@@ -75,8 +75,8 @@ void ProcessFilterSwitchDeclarations()
             SetFilterSwitch(throwOnError: true);
             SubscribeToFilterExpressionChanges();
 
-            var referenceName = _resolutionContext.AddFilterSwitch(switchName, filterSwitch);
-            _resolutionContext.ReaderOptions.OnFilterSwitchCreated?.Invoke(referenceName, filterSwitch);
+            _resolutionContext.AddFilterSwitch(switchName, filterSwitch);
+            _resolutionContext.ReaderOptions.OnFilterSwitchCreated?.Invoke(switchName, filterSwitch);
 
             void SubscribeToFilterExpressionChanges()
             {

src/Serilog.Settings.Configuration/Settings/Configuration/ConfigurationReaderOptions.cs

@@ -79,7 +79,6 @@ public ConfigurationReaderOptions() : this(dependencyContext: null)
 
     /// <summary>
     /// Called when a log filter switch is created while reading the <c>Serilog:FilterSwitches</c> section of the configuration.
-    /// The switch name includes the leading <c>$</c> character.
     /// </summary>
     public Action<string, ILoggingFilterSwitch>? OnFilterSwitchCreated { get; init; }
 

src/Serilog.Settings.Configuration/Settings/Configuration/ResolutionContext.cs

@@ -62,13 +62,12 @@ public string AddLevelSwitch(string levelSwitchName, LoggingLevelSwitch levelSwi
         return referenceName;
     }
 
-    public string AddFilterSwitch(string filterSwitchName, LoggingFilterSwitchProxy filterSwitch)
+    public void AddFilterSwitch(string filterSwitchName, LoggingFilterSwitchProxy filterSwitch)
     {
         if (filterSwitchName == null) throw new ArgumentNullException(nameof(filterSwitchName));
         if (filterSwitch == null) throw new ArgumentNullException(nameof(filterSwitch));
         var referenceName = ToSwitchReference(filterSwitchName);
         _declaredFilterSwitches[referenceName] = filterSwitch;
-        return referenceName;
     }
 
     string ToSwitchReference(string switchName)