Report invalid command line arguments as errors

Fixes wixtoolset/issues#6313

1 files changed, 7 insertions, 1 deletions

diff --git a/src/WixToolset.Core/CommandLine/CommandLineParser.cs b/src/WixToolset.Core/CommandLine/CommandLineParser.cs
index e78da47e..015d3e62 100644
--- a/src/WixToolset.Core/CommandLine/CommandLineParser.cs
+++ b/src/WixToolset.Core/CommandLine/CommandLineParser.cs
@@ -12,7 +12,7 @@ namespace WixToolset.Core.CommandLine
     {
         private const string ExpectedArgument = "expected argument";
 
-        public string ErrorArgument { get; set; }
+        public string ErrorArgument { get; private set; }
 
         private Queue<string> RemainingArguments { get; }
 
@@ -122,6 +122,12 @@ namespace WixToolset.Core.CommandLine
             return false;
         }
 
+        public void ReportErrorArgument(string argument, Message message = null)
+        {
+            this.Messaging.Write(message ?? ErrorMessages.AdditionalArgumentUnexpected(argument));
+            this.ErrorArgument = argument;
+        }
+
         public bool TryGetNextSwitchOrArgument(out string arg)
         {
             if (this.RemainingArguments.Count > 0)