Adopt C# 12 syntax across library and tests for .NET 8

CsvHelper.FastDynamic.Tests/TestData.cs

@@ -10,17 +10,17 @@ public static class TestData
 
     public static readonly string CsvContentWithMissingHeader = "Id,Name\r\n1,kazuakix\r\n2,daruyanagi,Ehime\r\n3,buchizo\r\n";
 
-    public static readonly IReadOnlyList<IDictionary<string, string>> CsvRecords = new[]
-    {
-        new Dictionary<string, string> { { "Id", "1" }, { "Name", "kazuakix" }, { "Location", "Wakayama" } },
-        new Dictionary<string, string> { { "Id", "2" }, { "Name", "daruyanagi" }, { "Location", "Ehime" } },
-        new Dictionary<string, string> { { "Id", "3" }, { "Name", "buchizo" }, { "Location", "Osaka" } }
-    };
+    public static readonly IReadOnlyList<IDictionary<string, string>> CsvRecords =
+    [
+        new Dictionary<string, string> { ["Id"] = "1", ["Name"] = "kazuakix", ["Location"] = "Wakayama" },
+        new Dictionary<string, string> { ["Id"] = "2", ["Name"] = "daruyanagi", ["Location"] = "Ehime" },
+        new Dictionary<string, string> { ["Id"] = "3", ["Name"] = "buchizo", ["Location"] = "Osaka" }
+    ];
 
-    public static readonly IReadOnlyList<object> CsvAnonymousRecords = new[]
-    {
+    public static readonly IReadOnlyList<object> CsvAnonymousRecords =
+    [
         new { Id = 1, Name = "kazuakix", Location = "Wakayama" },
         new { Id = 2, Name = "daruyanagi", Location = "Ehime" },
         new { Id = 3, Name = "buchizo", Location = "Osaka" }
-    };
+    ];
 }

CsvHelper.FastDynamic/CsvHeader.cs

@@ -15,7 +15,7 @@ public CsvHeader(string[] fieldNames)
     {
         _fieldNames = fieldNames ?? throw new ArgumentNullException(nameof(fieldNames));
 
-        _fieldNameLookup = new Dictionary<string, int>(fieldNames.Length, StringComparer.Ordinal);
+        _fieldNameLookup = new(fieldNames.Length, StringComparer.Ordinal);
 
         for (var i = fieldNames.Length - 1; i >= 0; i--)
         {

CsvHelper.FastDynamic/CsvHelper.FastDynamic.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>12.0</LangVersion>
   </PropertyGroup>
 
   <PropertyGroup>

CsvHelper.FastDynamic/CsvReaderExtensions.cs

@@ -64,7 +64,7 @@ public static IEnumerable<dynamic> EnumerateDynamicRecords(this CsvReader csvRea
 
     public static async Task<IReadOnlyList<dynamic>> GetDynamicRecordsAsync(this CsvReader csvReader)
     {
-        var records = new List<dynamic>();
+        List<dynamic> records = [];
 
         await foreach (var record in csvReader.EnumerateDynamicRecordsAsync())
         {

CsvHelper.FastDynamic/CsvRecordMetaObject.cs

@@ -9,7 +9,7 @@ namespace CsvHelper.FastDynamic;
 // Thanks, from https://github.com/StackExchange/Dapper/blob/master/Dapper/SqlMapper.DapperRowMetaObject.cs
 internal sealed class CsvRecordMetaObject : DynamicMetaObject
 {
-    private static readonly string[] s_emptyArray = Array.Empty<string>();
+    private static readonly string[] s_emptyArray = [];
 
     private static readonly MethodInfo s_getValueMethod = typeof(IDictionary<string, object>).GetProperty("Item").GetGetMethod();
     private static readonly MethodInfo s_setValueMethod = typeof(CsvRecord).GetMethod(nameof(CsvRecord.SetValue), new[] { typeof(string), typeof(object) });
@@ -21,52 +21,35 @@ public CsvRecordMetaObject(Expression expression, BindingRestrictions restrictio
 
     public override DynamicMetaObject BindGetIndex(GetIndexBinder binder, DynamicMetaObject[] indexes)
     {
-        var parameters = new[]
-        {
-            indexes[0].Expression
-        };
+        Expression[] parameters = [indexes[0].Expression];
 
         return CallMethod(s_getValueMethod, parameters);
     }
 
     public override DynamicMetaObject BindGetMember(GetMemberBinder binder)
     {
-        var parameters = new Expression[]
-        {
-            Expression.Constant(binder.Name)
-        };
+        Expression[] parameters = [Expression.Constant(binder.Name)];
 
         return CallMethod(s_getValueMethod, parameters);
     }
 
     public override DynamicMetaObject BindInvokeMember(InvokeMemberBinder binder, DynamicMetaObject[] args)
     {
-        var parameters = new Expression[]
-        {
-            Expression.Constant(binder.Name)
-        };
+        Expression[] parameters = [Expression.Constant(binder.Name)];
 
         return CallMethod(s_getValueMethod, parameters);
     }
 
     public override DynamicMetaObject BindSetIndex(SetIndexBinder binder, DynamicMetaObject[] indexes, DynamicMetaObject value)
     {
-        var parameters = new[]
-        {
-            indexes[0].Expression,
-            value.Expression
-        };
+        Expression[] parameters = [indexes[0].Expression, value.Expression];
 
         return CallMethod(s_setValueMethod, parameters);
     }
 
     public override DynamicMetaObject BindSetMember(SetMemberBinder binder, DynamicMetaObject value)
     {
-        var parameters = new[]
-        {
-            Expression.Constant(binder.Name),
-            value.Expression
-        };
+        Expression[] parameters = [Expression.Constant(binder.Name), value.Expression];
 
         return CallMethod(s_setValueMethod, parameters);
     }