Updated projects to target .NET 11

.github/workflows/benchmark.yml

@@ -17,15 +17,15 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 10.0.x
+          dotnet-version: 11.0.x
       - name: Restore dependencies
         run: dotnet restore
         working-directory: ./benchmarks/MiniExcel.Benchmarks
       - name: Build
         run: dotnet build --no-restore
         working-directory: ./benchmarks/MiniExcel.Benchmarks
       - name: Benchmark
-        run: dotnet run -c Release -f net10.0
+        run: dotnet run -c Release -f net11.0
         working-directory: ./benchmarks/MiniExcel.Benchmarks
         env:
           BenchmarkMode: Automatic
@@ -47,15 +47,15 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 10.0.x
+          dotnet-version: 11.0.x
       - name: Restore dependencies
         run: dotnet restore
         working-directory: ./benchmarks/MiniExcel.Benchmarks
       - name: Build
         run: dotnet build --no-restore
         working-directory: ./benchmarks/MiniExcel.Benchmarks
       - name: Benchmark
-        run: dotnet run -c Release -f net10.0
+        run: dotnet run -c Release -f net11.0
         working-directory: ./benchmarks/MiniExcel.Benchmarks
         env:
           BenchmarkMode: Automatic
@@ -77,15 +77,15 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 10.0.x
+          dotnet-version: 11.0.x
       - name: Restore dependencies
         run: dotnet restore
         working-directory: ./benchmarks/MiniExcel.Benchmarks
       - name: Build
         run: dotnet build --no-restore
         working-directory: ./benchmarks/MiniExcel.Benchmarks
       - name: Benchmark
-        run: dotnet run -c Release -f net10.0
+        run: dotnet run -c Release -f net11.0
         working-directory: ./benchmarks/MiniExcel.Benchmarks
         env:
           BenchmarkMode: Automatic

.github/workflows/codeql-analysis.yml

@@ -43,7 +43,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 10.0.x
+        dotnet-version: 11.0.x
 
     - name: Restore dependencies
       run: dotnet restore

.github/workflows/dotnet.yml

@@ -19,6 +19,7 @@ jobs:
           8.0.x
           9.0.x
           10.0.x
+          11.0.x
     - name: Restore dependencies
       run: dotnet restore
       env:

benchmarks/MiniExcel.Benchmarks/MiniExcel.Benchmarks.csproj

@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<OutputType>Exe</OutputType>
-		<TargetFrameworks>net9.0;net10.0</TargetFrameworks>
+		<TargetFrameworks>net10.0;net11.0</TargetFrameworks>
 		<Nullable>enable</Nullable>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<LangVersion>latest</LangVersion>

src/Directory.Build.props

@@ -1,11 +1,11 @@
 <Project>
 
     <PropertyGroup>
-        <TargetFrameworks>netstandard2.0;net8.0;net9.0;net10.0</TargetFrameworks>
+        <TargetFrameworks>netstandard2.0;net8.0;net9.0;net10.0;net11.0</TargetFrameworks>
         <Version>2.0.0-preview.4</Version>
         <Nullable>enable</Nullable>
         <ImplicitUsings>enable</ImplicitUsings>
-        <LangVersion>14</LangVersion>
+        <LangVersion>preview</LangVersion>
     </PropertyGroup>
 
     <PropertyGroup>

src/MiniExcel.Core/Helpers/Polyfills.cs

@@ -155,6 +155,26 @@ public static ValueTask<ZipArchive> CreateAsync(Stream stream, ZipArchiveMode mo
         }
     }
 #endif
+
+#if NET11_0_OR_GREATER
+    extension(Convert)
+    {
+        /// <summary>Converts the specified double value to decimal using the same approximation applied by versions of .NET no greater than 10.</summary>
+        /// <remarks>
+        /// In .NET 11 conversion APIs such as <see cref="Decimal(double)" /> and <see cref="Convert.ToDecimal(double)" /> among others
+        /// have been changed to approximate the resulting value more accurately. Unfortunately this is a significant breaking change for us
+        /// as we relied upon this truncation to discard unwanted decimal digits when mapping doubles (our default numeric type) to decimals.
+        /// This method is therefore a workaround to ensure backwards compatibility with previous versions of the library.
+        /// </remarks>
+        [EditorBrowsable(EditorBrowsableState.Advanced)]
+        public static decimal ToDecimalWithLegacyApproximation(double value)
+        {
+            Span<char> text = stackalloc char[32];
+            value.TryFormat(text, out var length, "G15", CultureInfo.InvariantCulture);
+            return decimal.Parse(text[..length], NumberStyles.Float, CultureInfo.InvariantCulture);
+        }
+    }
+#endif
 }
 
 #if NETSTANDARD2_0

src/MiniExcel.Core/MiniExcelDataReaderBase.cs

@@ -136,7 +136,12 @@ public virtual byte GetByte(int i) => GetValue(i) is { } value
 
     public virtual decimal GetDecimal(int i) => GetValue(i) switch
     {
-        decimal d => d,
+        decimal dec => dec,
+#if NET11_0_OR_GREATER
+        double f64 => Convert.ToDecimalWithLegacyApproximation(f64),
+#else
+        double f64 => Convert.ToDecimal(f64, CultureInfo.InvariantCulture),
+#endif
         null => throw new InvalidOperationException("The value is null"),
         var value => Convert.ToDecimal(value, MiniExcelConfiguration.Culture)
     };

src/MiniExcel.Core/Reflection/MiniExcelMapper.cs

@@ -214,7 +214,11 @@ public static partial class MiniExcelMapper
 
             else if (map.ExcludeNullableType == typeof(double))
             {
-                if (double.TryParse(Convert.ToString(itemValue, config.Culture), NumberStyles.Any, config.Culture, out var doubleValue))
+                if (itemValue is double f64)
+                {
+                    newValue = f64;
+                }
+                else if (double.TryParse(Convert.ToString(itemValue, config.Culture), NumberStyles.Any, config.Culture, out var doubleValue))
                 {
                     newValue = doubleValue;
                 }
@@ -227,6 +231,33 @@ public static partial class MiniExcelMapper
                 }
             }
 
+            else if (map.ExcludeNullableType == typeof(decimal))
+            {
+                if (itemValue is decimal dec)
+                {
+                    newValue = dec;
+                }
+                else if (itemValue is double f64)
+                {
+#if NET11_0_OR_GREATER
+                    newValue = Convert.ToDecimalWithLegacyApproximation(f64);
+#else
+                    newValue = Convert.ToDecimal(f64, CultureInfo.InvariantCulture);
+#endif
+                }
+                else if (decimal.TryParse(Convert.ToString(itemValue, config.Culture), NumberStyles.Any, config.Culture, out var decimalValue))
+                {
+                    newValue = decimalValue;
+                }
+                else
+                {
+                    var invariantString = Convert.ToString(itemValue, CultureInfo.InvariantCulture);
+                    newValue = decimal.TryParse(invariantString, NumberStyles.Any, CultureInfo.InvariantCulture, out var value) 
+                        ? value 
+                        : throw new InvalidCastException();
+                }
+            }
+
             else if (map.ExcludeNullableType == typeof(bool))
             {
                 var vs = itemValue?.ToString();

tests/MiniExcel.Csv.Tests/MiniExcel.Csv.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net8.0;net9.0;net10.0</TargetFrameworks>
+        <TargetFrameworks>net8.0;net9.0;net10.0;net11.0</TargetFrameworks>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
         <NoWarn>$(NoWarn);IDE0017;IDE0034;IDE0037;IDE0039;IDE0042;IDE0044;IDE0051;IDE0052;IDE0059;IDE0060;IDE0063;IDE1006;xUnit1004;CA1806;CA1816;CA1822;CA1825;CA1849;CA2000;CA2007;CA2208</NoWarn>

tests/MiniExcel.OpenXml.Tests/MiniExcel.OpenXml.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFrameworks>net8.0;net9.0;net10.0</TargetFrameworks>
+		<TargetFrameworks>net8.0;net9.0;net10.0;net11.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<NoWarn>$(NoWarn);IDE0017;IDE0034;IDE0037;IDE0039;IDE0042;IDE0044;IDE0051;IDE0052;IDE0059;IDE0060;IDE0063;IDE1006;xUnit1004;CA1806;CA1816;CA1822;CA1825;CA1849;CA2000;CA2007;CA2208</NoWarn>

tests/MiniExcel.Tests.Common/MiniExcel.Tests.Common.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net8.0;net9.0;net10.0</TargetFrameworks>
+        <TargetFrameworks>net8.0;net9.0;net10.0;net11.0</TargetFrameworks>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
         <RootNamespace>MiniExcelLib.Tests.Common</RootNamespace>