add multi targetting for .net

src/Demo.CS/NGenericDimensions.Demo.CS.csproj

@@ -1,8 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6</TargetFramework>
+    <TargetFrameworks>net48;net472;net471;net47;net462;net461;net46;net6.0;net7.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

src/Demo.VB/NGenericDimensions.Demo.VB.vbproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <RootNamespace>NGenericDimensions.Demo.VB</RootNamespace>
-    <TargetFramework>net6</TargetFramework>
+    <TargetFrameworks>net48;net472;net471;net47;net462;net461;net46;net6.0;net7.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

src/NGenericDimensions/Area.cs

@@ -222,6 +222,12 @@ object IConvertible.ToType(Type conversionType, IFormatProvider? provider)
         ushort IConvertible.ToUInt16(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt16(AreaValue);
         uint IConvertible.ToUInt32(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt32(AreaValue);
         ulong IConvertible.ToUInt64(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt64(AreaValue);
+#if !NET
+        bool IConvertible.ToBoolean(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Boolean is not supported.");
+        char IConvertible.ToChar(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Char is not supported.");
+        DateTime IConvertible.ToDateTime(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a DateTime is not supported.");
+        string IConvertible.ToString(IFormatProvider? provider) => ToString(null, provider);
+#endif
         #endregion
     }
 }

src/NGenericDimensions/Duration.cs

@@ -225,6 +225,12 @@ object IConvertible.ToType(Type conversionType, IFormatProvider? provider)
         ushort IConvertible.ToUInt16(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt16(DurationValue);
         uint IConvertible.ToUInt32(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt32(DurationValue);
         ulong IConvertible.ToUInt64(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt64(DurationValue);
+#if !NET
+        bool IConvertible.ToBoolean(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Boolean is not supported.");
+        char IConvertible.ToChar(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Char is not supported.");
+        DateTime IConvertible.ToDateTime(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a DateTime is not supported.");
+        string IConvertible.ToString(IFormatProvider? provider) => ToString(null, provider);
+#endif
         #endregion
     }
 }

src/NGenericDimensions/Helpers/Polyfill.cs

@@ -0,0 +1,34 @@
+#if !NET
+using System;
+using System.Reflection;
+
+namespace NGenericDimensions
+{
+    internal static class Polyfill
+    {
+        internal static bool Contains(this string source, string value, StringComparison comparisonType) => source.IndexOf(value, comparisonType) >= 0;
+
+        internal static string Replace(this string source, string oldValue, string? newValue, StringComparison comparisonType)
+        {
+            if (comparisonType == StringComparison.Ordinal)
+            {
+                return source.Replace(oldValue, newValue);
+            }
+
+            // not implemented since nothing seems to need this yet
+            throw new NotImplementedException();
+        }
+
+#if NET46
+        internal static bool IsAssignableFrom(this Type source, Type c) => source.GetTypeInfo().IsAssignableFrom(c.GetTypeInfo());
+#endif
+    }
+
+#if NET46
+    internal class HashCode
+    {
+        internal static int Combine<T1>(T1 value1) => value1?.GetHashCode() ?? 0;
+    }
+#endif
+}
+#endif

src/NGenericDimensions/Length.cs

@@ -276,7 +276,13 @@ object IConvertible.ToType(Type conversionType, IFormatProvider? provider)
         ushort IConvertible.ToUInt16(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt16(LengthValue);
         uint IConvertible.ToUInt32(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt32(LengthValue);
         ulong IConvertible.ToUInt64(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt64(LengthValue);
-        #endregion
+#if !NET
+        bool IConvertible.ToBoolean(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Boolean is not supported.");
+        char IConvertible.ToChar(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Char is not supported.");
+        DateTime IConvertible.ToDateTime(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a DateTime is not supported.");
+        string IConvertible.ToString(IFormatProvider? provider) => ToString(null, provider);
+#endif
+#endregion
     }
 }
 

src/NGenericDimensions/Mass.cs

@@ -202,6 +202,12 @@ object IConvertible.ToType(Type conversionType, IFormatProvider? provider)
         ushort IConvertible.ToUInt16(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt16(MassValue);
         uint IConvertible.ToUInt32(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt32(MassValue);
         ulong IConvertible.ToUInt64(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt64(MassValue);
+#if !NET
+        bool IConvertible.ToBoolean(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Boolean is not supported.");
+        char IConvertible.ToChar(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Char is not supported.");
+        DateTime IConvertible.ToDateTime(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a DateTime is not supported.");
+        string IConvertible.ToString(IFormatProvider? provider) => ToString(null, provider);
+#endif
         #endregion
     }
 }

src/NGenericDimensions/NGenericDimensions.csproj

@@ -1,11 +1,17 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6</TargetFramework>
+    <TargetFrameworks>net46;netstandard2.0;netstandard2.1;net6.0;net7.0;net8.0</TargetFrameworks>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <PropertyGroup Condition="('$(TargetFramework)' == 'netstandard2.0') Or ('$(TargetFramework)' == 'net46')">
+    <LangVersion>8.0</LangVersion>
+  </PropertyGroup>
+
   <ItemGroup>
+    <PackageReference Include="AgileObjects.NetStandardPolyfills" Version="1.6.0" Condition="'$(TargetFramework)' == 'net46'" />
+    <PackageReference Include="Microsoft.Bcl.HashCode" Version="1.1.1" Condition="'$(TargetFramework)' == 'netstandard2.0'" />
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.0.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

src/NGenericDimensions/Speed.cs

@@ -259,6 +259,12 @@ object IConvertible.ToType(Type conversionType, IFormatProvider? provider)
         ushort IConvertible.ToUInt16(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt16(SpeedValue);
         uint IConvertible.ToUInt32(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt32(SpeedValue);
         ulong IConvertible.ToUInt64(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt64(SpeedValue);
+#if !NET
+        bool IConvertible.ToBoolean(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Boolean is not supported.");
+        char IConvertible.ToChar(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Char is not supported.");
+        DateTime IConvertible.ToDateTime(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a DateTime is not supported.");
+        string IConvertible.ToString(IFormatProvider? provider) => ToString(null, provider);
+#endif
         #endregion
     }
 }

src/NGenericDimensions/UnitOfMeasure.cs

@@ -13,13 +13,15 @@ public interface IDimension : IFormattable, IConvertible
     {
         double Value { get; }
 
+#if NET
         bool IConvertible.ToBoolean(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Boolean is not supported.");
         char IConvertible.ToChar(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Char is not supported.");
         DateTime IConvertible.ToDateTime(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a DateTime is not supported.");
         string IConvertible.ToString(IFormatProvider? provider) => ToString(null, provider);
+#endif
     }
 
-    [EditorBrowsable(EditorBrowsableState.Never)]
+        [EditorBrowsable(EditorBrowsableState.Never)]
     [SuppressMessage("Design", "CA1040:Avoid empty interfaces", Justification = "Empty interfaces are sometimes the only way to control a generic constraint.")]
     public interface IDimensionSupportsPerExtension { }
 
@@ -137,7 +139,7 @@ internal protected virtual string ToSingularString()
             // use some default logic to try to figure out the singular form of the unit
             if (name.EndsWith("s", StringComparison.Ordinal))
             {
-                return name[0..^1];
+                return name.Substring(0, name.Length - 1);
             }
 
             // otherwise just return the name - if this name is plural, then the inheriting class should override this function

src/NGenericDimensions/Volume.cs

@@ -222,6 +222,12 @@ object IConvertible.ToType(Type conversionType, IFormatProvider? provider)
         ushort IConvertible.ToUInt16(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt16(VolumeValue);
         uint IConvertible.ToUInt32(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt32(VolumeValue);
         ulong IConvertible.ToUInt64(IFormatProvider? provider) => GenericOperatorMath<TDataType>.ConvertToUInt64(VolumeValue);
+#if !NET
+        bool IConvertible.ToBoolean(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Boolean is not supported.");
+        char IConvertible.ToChar(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a Char is not supported.");
+        DateTime IConvertible.ToDateTime(IFormatProvider? provider) => throw new InvalidCastException("The conversion to a DateTime is not supported.");
+        string IConvertible.ToString(IFormatProvider? provider) => ToString(null, provider);
+#endif
         #endregion
     }
 }

src/UnitTests/NGenericDimensionsUnitTests.csproj

@@ -1,20 +1,25 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6</TargetFramework>
+    <TargetFrameworks>net48;net472;net471;net47;net462;net461;net46;net6.0;net7.0;net8.0</TargetFrameworks>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="1.3.0">
+    <PackageReference Include="coverlet.collector" Version="6.0.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="3.6.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
-    <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.2">
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.8.0"  Condition="'$(TargetFramework)' != 'net46'" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="2.10.0" Condition="'$(TargetFramework)' == 'net46'" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="xunit" Version="2.6.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.4" Condition="('$(TargetFramework)' != 'net46') And ('$(TargetFramework)' != 'net461') And ('$(TargetFramework)' != 'net462')">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" Condition="('$(TargetFramework)' == 'net46') Or ('$(TargetFramework)' == 'net461') Or ('$(TargetFramework)' == 'net462')">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>

src/UnitTests/TestsHelperBBase.cs

@@ -11,7 +11,9 @@ public class TestsHelperBBase
     {
         protected readonly static string[] ValidDataTypeConversions =
             {
-            @"System.Char>(System.Convert.ToChar(4)", // this works in .net6 but not in an earlier one i think
+#if NET
+            @"System.Char>(System.Convert.ToChar(4)",
+#endif
             @"System.Double>(System.Convert.ToDouble(4.44444)",
             @"System.Double>(System.Convert.ToSingle(4.44444)",
             @"System.Single>(System.Convert.ToSingle(4.44444)",
@@ -32,6 +34,9 @@ public class TestsHelperBBase
 
         protected readonly static string[] InvalidDataTypeConversions =
             {
+#if !NET
+            @"System.Char>(System.Convert.ToChar(4)",
+#endif
             @"System.Boolean>(System.Convert.ToBoolean(4)"
             };