Upgrade to NUKE 9 and remove obsolete NET 6 targets

.nuke/build.schema.json

@@ -1,24 +1,5 @@
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
-  "properties": {
-    "Configuration": {
-      "type": "string",
-      "description": "Configuration to build - Default is 'Debug' (local) or 'Release' (server)",
-      "enum": [
-        "Debug",
-        "Release"
-      ]
-    },
-    "GitHubToken": {
-      "type": "string",
-      "description": "GitHub API token",
-      "default": "Secrets must be entered via 'nuke :secrets [profile]'"
-    },
-    "Solution": {
-      "type": "string",
-      "description": "Path to a solution file that is automatically loaded"
-    }
-  },
   "definitions": {
     "Host": {
       "type": "string",
@@ -119,5 +100,30 @@
       }
     }
   },
+  "allOf": [
+    {
+      "properties": {
+        "Configuration": {
+          "type": "string",
+          "description": "Configuration to build - Default is 'Debug' (local) or 'Release' (server)",
+          "enum": [
+            "Debug",
+            "Release"
+          ]
+        },
+        "GitHubToken": {
+          "type": "string",
+          "description": "GitHub API token",
+          "default": "Secrets must be entered via 'nuke :secrets [profile]'"
+        },
+        "Solution": {
+          "type": "string",
+          "description": "Path to a solution file that is automatically loaded"
+        }
+      }
+    },
+    {
       "$ref": "#/definitions/NukeBuild"
     }
+  ]
+}

OpenXmlFormats/NPOI.OpenXmlFormats.Core.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net6.0</TargetFrameworks>
+    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
     <AssemblyName>NPOI.OpenXmlFormats</AssemblyName>
     <RootNamespace>NPOI.OpenXmlFormats</RootNamespace>
     <SignAssembly>true</SignAssembly>

benchmarks/NPOI.Benchmarks/NPOI.Benchmarks.csproj

@@ -2,7 +2,7 @@
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFramework>net6.0</TargetFramework>
+        <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
     </PropertyGroup>
 

build/Build.cs

@@ -125,8 +125,8 @@ partial class Build : NukeBuild
                 .EnableNoRestore()
                 .SetConfiguration(Configuration)
                 .SetProjectFile(Solution)
-                .When(Host is GitHubActions, settings => settings.SetLoggers("GitHubActions"))
-                .When(!RuntimeInformation.IsOSPlatform(OSPlatform.Windows), settings => settings.SetFramework("net6.0"))
+                .When(_ => Host is GitHubActions, settings => settings.SetLoggers("GitHubActions"))
+                .When(_ => !RuntimeInformation.IsOSPlatform(OSPlatform.Windows), settings => settings.SetFramework("net8.0"))
             );
         });
 

build/_build.csproj

@@ -12,7 +12,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Nuke.Common" Version="8.1.0" />
+        <PackageReference Include="Nuke.Common" Version="9.0.4" />
     </ItemGroup>
 
 </Project>

main/NPOI.Core.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net6.0</TargetFrameworks>
+    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
     <RootNamespace>NPOI</RootNamespace>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\npoi.snk</AssemblyOriginatorKeyFile>

ooxml/NPOI.OOXML.Core.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net6.0</TargetFrameworks>
+    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
     <AssemblyName>NPOI.OOXML</AssemblyName>
     <RootNamespace>NPOI</RootNamespace>
     <SignAssembly>true</SignAssembly>

openxml4Net/NPOI.OpenXml4Net.Core.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net6.0</TargetFrameworks>
+    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
     <AssemblyName>NPOI.OpenXml4Net</AssemblyName>
     <RootNamespace>NPOI.OpenXml4Net</RootNamespace>
     <SignAssembly>true</SignAssembly>

solution/NPOI.Pack.csproj

@@ -3,7 +3,7 @@
   <!-- This is an umbrella project that gathers dependencies for dotnet pack -->
   
   <PropertyGroup>
-    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net6.0</TargetFrameworks>
+    <TargetFrameworks>net472;netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
     <IncludeBuildOutput>false</IncludeBuildOutput>
     <PackageId>NPOI</PackageId>
     <OutputPath>..\solution\$(Configuration)\</OutputPath>