Fix DotNetCorePathFinder not finding assemblies in parent assembly base path.

ICSharpCode.Decompiler/Metadata/DotNetCorePathFinder.cs

@@ -83,12 +83,10 @@ namespace ICSharpCode.Decompiler.Metadata
 				}
 			}
 
-			var depsJsonFileName = Path.Combine(basePath, $"{assemblyName}.deps.json");
-			if (!File.Exists(depsJsonFileName)) {
-				loadInfo?.AddMessage(assemblyName, MessageKind.Warning, $"{assemblyName}.deps.json could not be found!");
-				return;
-			}
+			packageBasePaths.Add(basePath);
 
+			var depsJsonFileName = Path.Combine(basePath, $"{assemblyName}.deps.json");
+			if (File.Exists(depsJsonFileName)) {
 				packages = LoadPackageInfos(depsJsonFileName, targetFrameworkIdString).ToArray();
 
 				foreach (var path in LookupPaths) {
@@ -101,6 +99,19 @@ namespace ICSharpCode.Decompiler.Metadata
 						}
 					}
 				}
+			} else {
+				loadInfo?.AddMessage(assemblyName, MessageKind.Warning, $"{assemblyName}.deps.json could not be found!");
+			}
+		}
+
+		public void AddSearchDirectory(string path)
+		{
+			this.packageBasePaths.Add(path);
+		}
+
+		public void RemoveSearchDirectory(string path)
+		{
+			this.packageBasePaths.Remove(path);
 		}
 
 		public string TryResolveDotNetCore(IAssemblyReference name)

ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs

@@ -71,11 +71,13 @@ namespace ICSharpCode.Decompiler.Metadata
 		public void AddSearchDirectory(string directory)
 		{
 			directories.Add(directory);
+			dotNetCorePathFinder?.AddSearchDirectory(directory);
 		}
 
 		public void RemoveSearchDirectory(string directory)
 		{
 			directories.Remove(directory);
+			dotNetCorePathFinder?.RemoveSearchDirectory(directory);
 		}
 
 		public string[] GetSearchDirectories()
@@ -185,6 +187,9 @@ namespace ICSharpCode.Decompiler.Metadata
 						goto default;
 					if (dotNetCorePathFinder == null) {
 						dotNetCorePathFinder = new DotNetCorePathFinder(mainAssemblyFileName, targetFramework, targetFrameworkIdentifier, targetFrameworkVersion);
+						foreach (var directory in directories) {
+							dotNetCorePathFinder.AddSearchDirectory(directory);
+						}
 					}
 					file = dotNetCorePathFinder.TryResolveDotNetCore(name);
 					if (file != null)