Netstandard2 0

.gitignore

@@ -8,3 +8,200 @@ build/
 /XmlResolverData/Data
 /XmlResolverData/XmlResolverData.csproj
 /DataTests/DataTest.cs
+
+
+# User-specific files
+*.suo
+*.user
+*.userprefs
+*.sln.docstates
+*.svclog
+.vs/
+.vscode/settings.json
+
+# Build results
+[Aa]rtifacts/
+[Dd]ebug/
+[Rr]elease/
+[Bb]inaries/
+[Bb]in/
+[Oo]bj/
+.dotnet/
+.tools/
+.packages/
+.nuget/
+.complog/
+/MSBuild_Logs/
+
+# Enable "build/" folder in the NuGet Packages folder since NuGet packages use it for MSBuild targets
+!packages/*/build/
+
+# Debug artifacts
+launchSettings.json
+
+# Prevent accidental re-checkin of NuGet.exe
+NuGet.exe
+
+# NuGet restore semaphore
+build/ToolsetPackages/toolsetpackages.semaphore
+
+# NuGet package
+src/Tools/UploadNugetZip/*.zip
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+UnitTestResults.html
+
+# NuGet V3 artifacts
+*-packages.config
+*.nuget.props
+*.nuget.targets
+project.lock.json
+*.binlog
+*.project.lock.json
+
+*_i.c
+*_p.c
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.wrn
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.log
+*.scc
+
+# Visual Studio cache files
+*.sln.ide/
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.opendb
+*.VC.db
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+*.ncrunch*
+.*crunch*.local.xml
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.Publish.xml
+
+# NuGet Packages Directory
+packages/
+
+# Windows Azure Build Output
+csx
+*.build.csdef
+
+# Windows Store app package directory
+AppPackages/
+
+# Others
+sql/
+*.Cache
+ClientBin/
+[Ss]tyle[Cc]op.*
+~$*
+*~
+*.dbmdl
+*.[Pp]ublish.xml
+*.pfx
+*.publishsettings
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file to a newer
+# Visual Studio version. Backup files are not needed, because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+App_Data/*.mdf
+App_Data/*.ldf
+
+
+#LightSwitch generated files
+GeneratedArtifacts/
+_Pvt_Extensions/
+ModelManifest.xml
+
+# =========================
+# Windows detritus
+# =========================
+
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Mac desktop service store files
+.DS_Store
+
+# JetBrains Rider
+.idea/
+
+# WPF temp projects
+*wpftmp.*
+

XmlResolver/ResourceAccess.cs

@@ -191,7 +191,7 @@ private static (Uri resolvedUri, HttpResponseMessage resp) _getHttpResponse(Uri
             status = resp.StatusCode;
             if (seen.Contains(resolvedUri))
             {
-                throw new HttpRequestException("Redirect loop", null, status);
+                throw CreateHttpRequestException("Redirect loop", status);
             }
 
             seen.Add(resolvedUri);
@@ -204,7 +204,7 @@ private static (Uri resolvedUri, HttpResponseMessage resp) _getHttpResponse(Uri
             if (resp.StatusCode == HttpStatusCode.Moved || resp.StatusCode == HttpStatusCode.Redirect)
             {
                 resolvedUri = resp.Content.Headers.ContentLocation
-                              ?? throw new HttpRequestException("Redirect without location", null, status); 
+                              ?? throw CreateHttpRequestException("Redirect without location", status); 
             }
             else
             {
@@ -214,10 +214,19 @@ private static (Uri resolvedUri, HttpResponseMessage resp) _getHttpResponse(Uri
 
         if (count <= 0)
         {
-            throw new HttpRequestException("Too many redirects", null, status);
+            throw CreateHttpRequestException("Too many redirects", status);
         }
 
-        throw new HttpRequestException("Failed to read resource", null, status);
+        throw CreateHttpRequestException("Failed to read resource", status);
+
+        HttpRequestException CreateHttpRequestException(string text, HttpStatusCode statusCode)
+        {
+#if NETSTANDARD2_0
+            return new HttpRequestException($"{text} ({statusCode})");
+#else
+            return new HttpRequestException(text, null, statusCode);
+#endif
+        }
     }
 
     private static IResourceResponse _getFileResource(IResourceRequest request, Uri uri)

XmlResolver/Utils/NetStandardExtensions.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
+using System.Text;
+using System.Threading.Tasks;
+
+#if NETSTANDARD2_0
+namespace XmlResolver.Utils
+{
+    internal static class NetStandardExtensions
+    {
+        public static int IndexOf(this string s, char value, StringComparison comparisonType)
+        {
+            return s.IndexOf($"{value}", comparisonType);
+        }
+
+        public static Span<string> Split(this string s, string sep, StringSplitOptions stringSplitOptions = StringSplitOptions.None)
+        {
+            char[] sepChars = [.. s];
+            return s.Split(sepChars, stringSplitOptions);
+        }
+
+        public static bool StartsWith(this string s, char c)
+        {
+            if (s.Length > 0)
+            {
+                if (s[0] == c)
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        public static HttpResponseMessage Send(this HttpClient client, HttpRequestMessage message)
+        {
+            return client.SendAsync(message).Result;
+        }
+
+        public static Stream ReadAsStream(this HttpContent content)
+        {
+            return content.ReadAsStreamAsync().Result;
+        }
+    }
+}
+#endif

XmlResolver/Utils/UriUtils.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Buffers;
 using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
 using System.Globalization;
 using System.IO;
 using System.IO.Compression;

XmlResolver/XmlResolver.csproj

@@ -2,7 +2,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFrameworks>net8.0;netstandard2.0</TargetFrameworks>
+    <LangVersion>14</LangVersion>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
     <Authors>Norman Walsh</Authors>
     <Description>The xmlresolver project provides an implementation of the System.Xml.XmlResolver. It uses the OASIS XML Catalogs V1.1 Standard to provide a mapping from external identifiers and URIs to local resources.</Description>
@@ -22,11 +23,24 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="10.0.1" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Xml" Version="10.0.1" />
     <PackageReference Include="NLog" Version="6.0.7" />
-    <PackageReference Include="NuGet.Frameworks" Version="7.0.1" />
     <PackageReference Include="System.IO.Packaging" Version="10.0.1" />
   </ItemGroup>
 
+  <Choose>
+    <When Condition="'$(TargetFramework)' == 'netstandard2.0'">
+      <ItemGroup>
+        <PackageReference Include="System.Collections.Immutable" Version="10.0.1" />
+        <PackageReference Include="IndexRange" Version="1.1.0" />
+      </ItemGroup>
+    </When>
+    <Otherwise>
+      <ItemGroup>
+        <PackageReference Include="NuGet.Frameworks" Version="7.0.1" />
+      </ItemGroup>
+    </Otherwise>
+  </Choose>
+
   <ItemGroup>
-    <None Include="readme.md" Pack="true" PackagePath=""/>
+    <None Include="readme.md" Pack="true" PackagePath="" />
   </ItemGroup>
 </Project>

XmlResolver/XmlResolverConfiguration.cs

@@ -407,7 +407,7 @@ private void LoadPropertiesConfiguration(Uri propertyFile, IConfigurationSection
 
             property = section.GetSection("catalogs");
             if (property.Value != null) {
-                String[] tokens = property.Value.Split(";");
+                var tokens = property.Value.Split(";");
                 catalogs.Clear();
                 if (showConfigChanges) {
                     logger.Debug("Catalog list cleared");
@@ -429,7 +429,7 @@ private void LoadPropertiesConfiguration(Uri propertyFile, IConfigurationSection
 
             property = section.GetSection("catalogAdditions");
             if (property.Value != null) {
-                String[] tokens = property.Value.Split(";");
+                var tokens = property.Value.Split(";");
                 foreach (var token in tokens) {
                     if (!"".Equals(token)) {
                         string caturi = token;

tools/make-csproj.xsl

@@ -12,7 +12,7 @@
 <xsl:template match="/">
   <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-      <TargetFramework>net8.0</TargetFramework>
+      <TargetFramework>netstandard2.0</TargetFramework>
       <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
       <Authors>Norman Walsh</Authors>
       <Description>This package provides a common set of XML resources and an XML Catalog that resolves them. It’s most commonly used with the xmlresolver package.</Description>