Fix icsharpcode#3349: Get rid of version string manipulation in UniversalAssemblyResolver.ParseTargetFramework.

Author: siegfriedpammer

ICSharpCode.Decompiler.Tests/ProjectDecompiler/TargetFrameworkTests.cs

@@ -19,6 +19,7 @@
 using System;
 
 using ICSharpCode.Decompiler.CSharp.ProjectDecompiler;
+using ICSharpCode.Decompiler.Metadata;
 
 using NUnit.Framework;
 
@@ -119,5 +120,14 @@ public void VerifyMoniker(string identifier, int version, string expectedMoniker
 			// Assert
 			Assert.That(targetFramework.Moniker, Is.EqualTo(expectedMoniker));
 		}
+
+		[TestCase(".NETCoreApp, Version=v5.0", TargetFrameworkIdentifier.NET, "5.0.0")]
+		[TestCase(".NETCoreApp, Version=v10.0", TargetFrameworkIdentifier.NET, "10.0.0")]
+		public void VerifyUniversalAssemblyResolverParseTargetFramework(string targetFramework, TargetFrameworkIdentifier identifier, string version)
+		{
+			var (id, v) = UniversalAssemblyResolver.ParseTargetFramework(targetFramework);
+			Assert.That(id, Is.EqualTo(identifier));
+			Assert.That(v.ToString(3), Is.EqualTo(version));
+		}
 	}
 }

ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs

@@ -189,15 +189,16 @@ internal static (TargetFrameworkIdentifier, Version) ParseTargetFramework(string
 				switch (pair[0].Trim().ToUpperInvariant())
 				{
 					case "VERSION":
-						var versionString = pair[1].TrimStart('v', ' ', '\t');
-						if (identifier == TargetFrameworkIdentifier.NETCoreApp ||
-							identifier == TargetFrameworkIdentifier.NETStandard)
-						{
-							if (versionString.Length == 3)
-								versionString += ".0";
-						}
+						var versionString = pair[1].TrimStart('v', 'V', ' ', '\t');
+
 						if (!Version.TryParse(versionString, out version))
+						{
 							version = null;
+						}
+						else
+						{
+							version = new Version(version.Major, version.Minor, version.Build < 0 ? 0 : version.Build);
+						}
 						// .NET 5 or greater still use ".NETCOREAPP" as TargetFrameworkAttribute value...
 						if (version?.Major >= 5 && identifier == TargetFrameworkIdentifier.NETCoreApp)
 							identifier = TargetFrameworkIdentifier.NET;