Don't use virtual member in constructor

src/lib-csharp/Locators/LinuxVelopackLocator.cs

@@ -47,6 +47,12 @@ namespace Velopack.Locators
 
         /// <summary> File path of the .AppImage which mounted and ran this application. </summary>
         public string? AppImagePath => Environment.GetEnvironmentVariable("APPIMAGE");
+        
+        /// <inheritdoc />
+        public override uint ProcessId { get; }
+        
+        /// <inheritdoc />
+        public override string ProcessExePath { get; }
 
         /// <summary>
         /// Creates a new <see cref="OsxVelopackLocator"/> and auto-detects the
@@ -59,18 +65,18 @@ namespace Velopack.Locators
                 throw new NotSupportedException("Cannot instantiate LinuxVelopackLocator on a non-linux system.");
             
             ProcessId = currentProcessId;
-            ProcessExePath = currentProcessPath;
+            var ourPath = ProcessExePath = currentProcessPath;
 
             Log.Info($"Initialising {nameof(LinuxVelopackLocator)}");
 
             // are we inside a mounted .AppImage?
-            var ix = ProcessExePath.IndexOf("/usr/bin/", StringComparison.InvariantCultureIgnoreCase);
+            var ix = ourPath.IndexOf("/usr/bin/", StringComparison.InvariantCultureIgnoreCase);
             if (ix <= 0) {
-                Log.Warn($"Unable to locate .AppImage root from '{ProcessExePath}'. This warning indicates that the application is not running from a mounted .AppImage, for example during development.");
+                Log.Warn($"Unable to locate .AppImage root from '{ourPath}'. This warning indicates that the application is not running from a mounted .AppImage, for example during development.");
                 return;
             }
 
-            var rootDir = ProcessExePath.Substring(0, ix);
+            var rootDir = ourPath.Substring(0, ix);
             var contentsDir = Path.Combine(rootDir, "usr", "bin");
             var updateExe = Path.Combine(contentsDir, "UpdateNix");
             var metadataPath = Path.Combine(contentsDir, CoreUtil.SpecVersionFileName);

src/lib-csharp/Locators/OsxVelopackLocator.cs

@@ -44,6 +44,12 @@ namespace Velopack.Locators
 
         /// <inheritdoc />
         public override string? Channel { get; }
+        
+        /// <inheritdoc />
+        public override uint ProcessId { get; }
+        
+        /// <inheritdoc />
+        public override string ProcessExePath { get; }
 
         /// <summary>
         /// Creates a new <see cref="OsxVelopackLocator"/> and auto-detects the
@@ -56,18 +62,18 @@ namespace Velopack.Locators
                 throw new NotSupportedException("Cannot instantiate OsxLocator on a non-osx system.");
             
             ProcessId = currentProcessId;
-            ProcessExePath = currentProcessPath;
+            var ourPath = ProcessExePath = currentProcessPath;
 
             Log.Info($"Initialising {nameof(OsxVelopackLocator)}");
 
             // are we inside a .app?
-            var ix = ProcessExePath.IndexOf(".app/", StringComparison.InvariantCultureIgnoreCase);
+            var ix = ourPath.IndexOf(".app/", StringComparison.InvariantCultureIgnoreCase);
             if (ix <= 0) {
-                Log.Warn($"Unable to locate .app root from '{ProcessExePath}'");
+                Log.Warn($"Unable to locate .app root from '{ourPath}'");
                 return;
             }
 
-            var appPath = ProcessExePath.Substring(0, ix + 4);
+            var appPath = ourPath.Substring(0, ix + 4);
             var contentsDir = Path.Combine(appPath, "Contents");
             var macosDir = Path.Combine(contentsDir, "MacOS");
             var updateExe = Path.Combine(macosDir, "UpdateMac");

src/lib-csharp/Locators/TestVelopackLocator.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.Extensions.Logging;
 using NuGet.Versioning;
+#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
 namespace Velopack.Locators
 {
@@ -13,7 +14,6 @@ namespace Velopack.Locators
     [ExcludeFromCodeCoverage]
     public class TestVelopackLocator : VelopackLocator
     {
-        /// <inheritdoc />
         public override string? AppId {
             get {
                 if (_id == null) {
@@ -23,7 +23,6 @@ namespace Velopack.Locators
             }
         }
 
-        /// <inheritdoc />
         public override string? RootAppDir {
             get {
                 if (_root == null) {
@@ -33,7 +32,6 @@ namespace Velopack.Locators
             }
         }
 
-        /// <inheritdoc />
         public override string? PackagesDir {
             get {
                 if (_packages == null) {
@@ -43,7 +41,6 @@ namespace Velopack.Locators
             }
         }
 
-        /// <inheritdoc />
         public override string? UpdateExePath {
             get {
                 if (_updatePath == null) {
@@ -53,7 +50,6 @@ namespace Velopack.Locators
             }
         }
 
-        /// <inheritdoc />
         public override SemanticVersion? CurrentlyInstalledVersion {
             get {
                 if (_version == null) {
@@ -63,7 +59,6 @@ namespace Velopack.Locators
             }
         }
 
-        /// <inheritdoc />
         public override string? AppContentDir {
             get {
                 if (_appContent == null) {
@@ -73,14 +68,12 @@ namespace Velopack.Locators
             }
         }
 
-        /// <inheritdoc />
         public override string? Channel {
             get {
                 return _channel;
             }
         }
 
-        /// <inheritdoc />
         public override VelopackAsset? GetLatestLocalFullPackage()
         {
             if (_asset != null) {
@@ -89,6 +82,10 @@ namespace Velopack.Locators
             return base.GetLatestLocalFullPackage();
         }
 
+        public override uint ProcessId => 0;
+        
+        public override string ProcessExePath { get; }
+
         private readonly string? _updatePath;
         private readonly SemanticVersion? _version;
         private readonly string? _packages;
@@ -106,7 +103,7 @@ namespace Velopack.Locators
 
         /// <inheritdoc cref="TestVelopackLocator" />
         public TestVelopackLocator(string appId, string version, string packagesDir, string? appDir,
-            string? rootDir, string? updateExe, string? channel = null, ILogger? logger = null, VelopackAsset? localPackage = null)
+            string? rootDir, string? updateExe, string? channel = null, ILogger? logger = null, VelopackAsset? localPackage = null, string processPath = null!)
             : base(logger)
         {
             _id = appId;
@@ -117,6 +114,7 @@ namespace Velopack.Locators
             _appContent = appDir;
             _channel = channel;
             _asset = localPackage;
+            ProcessExePath = processPath;
         }
     }
 }

src/lib-csharp/Locators/VelopackLocator.cs

@@ -66,13 +66,13 @@ namespace Velopack.Locators
         public abstract string? Channel { get; }
 
         /// <inheritdoc/>
-        public virtual bool IsPortable => false;
+        public abstract uint ProcessId { get; }
-        
-        /// <inheritdoc/>
-        public uint ProcessId { get; protected set; }
 
         /// <inheritdoc/>
-        public string ProcessExePath { get; protected set; }
+        public abstract string ProcessExePath { get; }
+        
+        /// <inheritdoc/>
+        public virtual bool IsPortable => false;
 
         /// <inheritdoc/>
         public virtual string? ThisExeRelativePath {

src/lib-csharp/Locators/WindowsVelopackLocator.cs

@@ -38,6 +38,12 @@ namespace Velopack.Locators
         /// <inheritdoc />
         public override string? Channel { get; }
 
+        /// <inheritdoc />
+        public override uint ProcessId { get; }
+        
+        /// <inheritdoc />
+        public override string ProcessExePath { get; }
+
         /// <inheritdoc cref="WindowsVelopackLocator" />
         public WindowsVelopackLocator(string currentProcessPath, uint currentProcessId, ILogger logger)
             : base(logger)
@@ -46,7 +52,7 @@ namespace Velopack.Locators
                 throw new NotSupportedException("Cannot instantiate WindowsLocator on a non-Windows system.");
 
             ProcessId = currentProcessId;
-            ProcessExePath = currentProcessPath;
+            var ourPath = ProcessExePath = currentProcessPath;
 
             // We try various approaches here. Firstly, if Update.exe is in the parent directory,
             // we use that. If it's not present, we search for a parent "current" or "app-{ver}" directory,
@@ -54,11 +60,11 @@ namespace Velopack.Locators
             // There is some legacy code here, because it's possible that we're running in an "app-{ver}" 
             // directory which is NOT containing a sq.version, in which case we need to infer a lot of info.
 
-            ProcessExePath = Path.GetFullPath(ProcessExePath);
+            ProcessExePath = Path.GetFullPath(ourPath);
-            string myDirPath = Path.GetDirectoryName(ProcessExePath)!;
+            string myDirPath = Path.GetDirectoryName(ourPath)!;
             var myDirName = Path.GetFileName(myDirPath);
             var possibleUpdateExe = Path.GetFullPath(Path.Combine(myDirPath, "..", "Update.exe"));
-            var ixCurrent = ProcessExePath.LastIndexOf("/current/", StringComparison.InvariantCultureIgnoreCase);
+            var ixCurrent = ourPath.LastIndexOf("/current/", StringComparison.InvariantCultureIgnoreCase);
 
             Log.Info($"Initializing {nameof(WindowsVelopackLocator)}");
 
@@ -86,7 +92,7 @@ namespace Velopack.Locators
                 }
             } else if (ixCurrent > 0) {
                 // this is an attempt to handle the case where we are running in a nested current directory.
-                var rootDir = ProcessExePath.Substring(0, ixCurrent);
+                var rootDir = ourPath.Substring(0, ixCurrent);
                 var currentDir = Path.Combine(rootDir, "current");
                 var manifestFile = Path.Combine(currentDir, CoreUtil.SpecVersionFileName);
                 possibleUpdateExe = Path.GetFullPath(Path.Combine(rootDir, "Update.exe"));