Add helper method to name parameter like $”{(keyName, value)}

src/ZLogger/ZLoggerInterpolatedStringHandler.LogLevel.cs

@@ -28,6 +28,11 @@ public void AppendFormatted<T>(Nullable<T> value, int alignment = 0, string? for
     {
         this.innerHandler.AppendFormatted<T>(value, alignment, format, argumentName);
     }
+
+    public void AppendFormatted<T>((string, T) namedValue, int alignment = 0, string? format = null, string? _ = null)
+    {
+        this.innerHandler.AppendFormatted(namedValue, alignment, format);
+    }
 }
 
 [InterpolatedStringHandler]
@@ -54,6 +59,11 @@ public void AppendFormatted<T>(Nullable<T> value, int alignment = 0, string? for
     {
         this.innerHandler.AppendFormatted<T>(value, alignment, format, argumentName);
     }
+
+    public void AppendFormatted<T>((string, T) namedValue, int alignment = 0, string? format = null, string? _ = null)
+    {
+        this.innerHandler.AppendFormatted(namedValue, alignment, format);
+    }
 }
 
 [InterpolatedStringHandler]
@@ -80,6 +90,11 @@ public void AppendFormatted<T>(Nullable<T> value, int alignment = 0, string? for
     {
         this.innerHandler.AppendFormatted<T>(value, alignment, format, argumentName);
     }
+
+    public void AppendFormatted<T>((string, T) namedValue, int alignment = 0, string? format = null, string? _ = null)
+    {
+        this.innerHandler.AppendFormatted(namedValue, alignment, format);
+    }
 }
 
 [InterpolatedStringHandler]
@@ -106,6 +121,11 @@ public void AppendFormatted<T>(Nullable<T> value, int alignment = 0, string? for
     {
         this.innerHandler.AppendFormatted<T>(value, alignment, format, argumentName);
     }
+
+    public void AppendFormatted<T>((string, T) namedValue, int alignment = 0, string? format = null, string? _ = null)
+    {
+        this.innerHandler.AppendFormatted(namedValue, alignment, format);
+    }
 }
 
 [InterpolatedStringHandler]
@@ -132,6 +152,11 @@ public void AppendFormatted<T>(Nullable<T> value, int alignment = 0, string? for
     {
         this.innerHandler.AppendFormatted<T>(value, alignment, format, argumentName);
     }
+
+    public void AppendFormatted<T>((string, T) namedValue, int alignment = 0, string? format = null, string? _ = null)
+    {
+        this.innerHandler.AppendFormatted(namedValue, alignment, format);
+    }
 }
 
 [InterpolatedStringHandler]
@@ -158,5 +183,10 @@ public void AppendFormatted<T>(Nullable<T> value, int alignment = 0, string? for
     {
         this.innerHandler.AppendFormatted<T>(value, alignment, format, argumentName);
     }
+
+    public void AppendFormatted<T>((string, T) namedValue, int alignment = 0, string? format = null, string? _ = null)
+    {
+        this.innerHandler.AppendFormatted(namedValue, alignment, format);
+    }
 }
 

src/ZLogger/ZLoggerInterpolatedStringHandler.LogLevel.tt

@@ -38,6 +38,11 @@ public ref struct ZLogger<#= logLevel #>InterpolatedStringHandler
     {
         this.innerHandler.AppendFormatted<T>(value, alignment, format, argumentName);
     }
+
+    public void AppendFormatted<T>((string, T) namedValue, int alignment = 0, string? format = null, string? _ = null)
+    {
+        this.innerHandler.AppendFormatted(namedValue, alignment, format);
+    }
 }
 
 <# } #>

src/ZLogger/ZLoggerInterpolatedStringHandler.cs

@@ -109,6 +109,11 @@ public void AppendFormatted<T>(Nullable<T> value, int alignment = 0, string? for
             }
         }
 
+        public void AppendFormatted<T>((string, T) namedValue, int alignment = 0, string? format = null, string? _ = null)
+        {
+            AppendFormatted(namedValue.Item2, alignment, format, namedValue.Item1);
+        }
+
         internal InterpolatedStringLogState GetStateAndClear()
         {
             // MessageSequence is immutable

tests/ZLogger.Tests/NamedParamTest.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Text.Json;
+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using ZLogger.Formatters;
+
+namespace ZLogger.Tests
+{
+    public class NamedParamTest
+    {
+        [Fact]
+        public void StructuredLoggingOptions()
+        {
+            var options = new ZLoggerOptions();
+            options.UseJsonFormatter();
+
+            var processor = new TestProcessor(options);
+            using var loggerFactory = LoggerFactory.Create(x =>
+            {
+                x.SetMinimumLevel(LogLevel.Debug);
+                x.AddZLoggerLogProcessor(processor);
+            });
+            var logger = loggerFactory.CreateLogger("test");
+
+            logger.ZLogInformation($"{("TAKO", 100)} {("YAKI", 200):D5} {("T", new DateTime(2023, 12, 31)),15:yyyy-MM-dd}");
+
+            var json = processor.EntryMessages.Dequeue();
+            var doc = JsonDocument.Parse(json).RootElement;
+
+            doc.GetProperty("Message").GetString().Should().Be("100 00200      2023-12-31");
+            doc.GetProperty("TAKO").GetInt32().Should().Be(100);
+            doc.GetProperty("YAKI").GetInt32().Should().Be(200);
+            doc.GetProperty("T").GetDateTime().Should().Be(new DateTime(2023, 12, 31));
+        }
+    }    
+}