Update

Author: wwh1004

src/DotNet/Pdb/Portable/PortablePdbCustomDebugInfoWriter.cs

@@ -222,7 +222,7 @@ void WriteSourceLink(PdbSourceLinkCustomDebugInfo cdi) {
 
 		void WriteAsyncMethodSteppingInformation(PdbAsyncMethodCustomDebugInfo cdi) {
 			if (!methodContext.HasBody) {
-				helper.Error2("Method has no body, can't write custom debug info: {0.}", cdi.Kind);
+				helper.Error2("Method has no body, can't write custom debug info: {0}.", cdi.Kind);
 				return;
 			}
 

src/DotNet/Writer/IWriterError.cs

@@ -36,7 +36,7 @@ static partial class Extensions {
 		/// <param name="helper">The instance of <see cref="IWriterError"/></param>
 		/// <param name="message">Error message</param>
 		/// <param name="args">Optional message arguments</param>
-		public static void Error2(this IWriterError helper, string message, params object[] args) {
+		internal static void Error2(this IWriterError helper, string message, params object[] args) {
 			if (helper is IWriterError2 helper2)
 				helper2.Error(message, args);
 			else

src/DotNet/Writer/MetadataErrorContext.cs

@@ -1,3 +1,5 @@
+// dnlib: See LICENSE.txt for more info
+
 using System;
 using System.Text;
 
@@ -19,6 +21,8 @@ public void Append(string errorLevel, ref string message, ref object[] args) {
 			var newArgs = new object[args.Length + count];
 			Array.Copy(args, 0, newArgs, 0, args.Length);
 
+			if (newMessage.Length != 0 && newMessage[newMessage.Length - 1] != '.')
+				newMessage.Append('.');
 			newMessage.AppendFormat(" {0} occurred after metadata event {{{1}}}", errorLevel, ctxArgIndex);
 			newArgs[ctxArgIndex] = Event;
 
@@ -29,7 +33,7 @@ public void Append(string errorLevel, ref string message, ref object[] args) {
 					MethodDef => "method",
 					EventDef => "event",
 					PropertyDef => "property",
-					_ => throw new InvalidOperationException()
+					_ => "???"
 				};
 				newMessage.AppendFormat(" during writing {0} '{{{1}}}' (0x{{{2}:X8}})", sourceType, ctxArgIndex + 1, ctxArgIndex + 2);
 				newArgs[ctxArgIndex + 1] = tokenSource;

src/DotNet/Writer/PreserveTokensMetadata.cs

@@ -855,7 +855,7 @@ void FindMemberDefs() {
 			foreach (var type in allTypeDefs) {
 				if (type is null)
 					continue;
-				
+
 				pos = 0;
 				var fields = type.Fields;
 				count = fields.Count;