Make lambdas static

Make a number of lambda methods explicitly static.

Author: martincostello

src/Logging.XUnit/XUnitLogger.cs

@@ -50,7 +50,7 @@ private XUnitLogger(string name, XUnitLoggerOptions? options)
     {
         Name = name ?? throw new ArgumentNullException(nameof(name));
 
-        _filter = options?.Filter ?? ((_, _) => true);
+        _filter = options?.Filter ?? (static (_, _) => true);
         _messageSinkMessageFactory = options?.MessageSinkMessageFactory ?? (message => new DiagnosticMessage(message));
         IncludeScopes = options?.IncludeScopes ?? false;
     }
@@ -80,7 +80,7 @@ private XUnitLogger(string name, XUnitLoggerOptions? options)
     /// <summary>
     /// Gets or sets a delegate representing the system clock.
     /// </summary>
-    internal Func<DateTimeOffset> Clock { get; set; } = () => DateTimeOffset.Now;
+    internal Func<DateTimeOffset> Clock { get; set; } = static () => DateTimeOffset.Now;
 
     /// <inheritdoc />
     public IDisposable BeginScope<TState>(TState state)

src/Logging.XUnit/XUnitLoggerExtensions.IMessageSink.cs

@@ -36,7 +36,7 @@ public static ILoggingBuilder AddXUnit(this ILoggingBuilder builder, IMessageSin
             throw new ArgumentNullException(nameof(accessor));
         }
 
-        return builder.AddXUnit(accessor, (_) => { });
+        return builder.AddXUnit(accessor, static (_) => { });
     }
 
     /// <summary>
@@ -104,7 +104,7 @@ public static ILoggingBuilder AddXUnit(this ILoggingBuilder builder, IMessageSin
             throw new ArgumentNullException(nameof(messageSink));
         }
 
-        return builder.AddXUnit(messageSink, (_) => { });
+        return builder.AddXUnit(messageSink, static (_) => { });
     }
 
     /// <summary>
@@ -227,7 +227,7 @@ public static ILoggerFactory AddXUnit(this ILoggerFactory factory, IMessageSink
             throw new ArgumentNullException(nameof(messageSink));
         }
 
-        return factory.AddXUnit(messageSink, (_) => { });
+        return factory.AddXUnit(messageSink, static (_) => { });
     }
 
     /// <summary>

src/Logging.XUnit/XUnitLoggerExtensions.ITestOutputHelper.cs

@@ -31,7 +31,7 @@ public static ILoggingBuilder AddXUnit(this ILoggingBuilder builder)
             throw new ArgumentNullException(nameof(builder));
         }
 
-        return builder.AddXUnit(new AmbientTestOutputHelperAccessor(), (_) => { });
+        return builder.AddXUnit(new AmbientTestOutputHelperAccessor(), static (_) => { });
     }
 
     /// <summary>
@@ -57,7 +57,7 @@ public static ILoggingBuilder AddXUnit(this ILoggingBuilder builder, ITestOutput
             throw new ArgumentNullException(nameof(accessor));
         }
 
-        return builder.AddXUnit(accessor, (_) => { });
+        return builder.AddXUnit(accessor, static (_) => { });
     }
 
     /// <summary>
@@ -125,7 +125,7 @@ public static ILoggingBuilder AddXUnit(this ILoggingBuilder builder, ITestOutput
             throw new ArgumentNullException(nameof(outputHelper));
         }
 
-        return builder.AddXUnit(outputHelper, (_) => { });
+        return builder.AddXUnit(outputHelper, static (_) => { });
     }
 
     /// <summary>
@@ -248,7 +248,7 @@ public static ILoggerFactory AddXUnit(this ILoggerFactory factory, ITestOutputHe
             throw new ArgumentNullException(nameof(outputHelper));
         }
 
-        return factory.AddXUnit(outputHelper, (_) => { });
+        return factory.AddXUnit(outputHelper, static (_) => { });
     }
 
     /// <summary>

src/Logging.XUnit/XUnitLoggerOptions.cs

@@ -22,12 +22,12 @@ public XUnitLoggerOptions()
     /// <summary>
     /// Gets or sets the category filter to apply to logs.
     /// </summary>
-    public Func<string?, LogLevel, bool> Filter { get; set; } = (c, l) => true; // By default log everything
+    public Func<string?, LogLevel, bool> Filter { get; set; } = static (c, l) => true; // By default log everything
 
     /// <summary>
     /// Gets or sets the message sink message factory to use when writing to a <see cref="IMessageSink"/>.
     /// </summary>
-    public Func<string, IMessageSinkMessage> MessageSinkMessageFactory { get; set; } = m => new DiagnosticMessage(m);
+    public Func<string, IMessageSinkMessage> MessageSinkMessageFactory { get; set; } = static (m) => new DiagnosticMessage(m);
 
     /// <summary>
     /// Gets or sets a value indicating whether to include scopes.