System.InvalidOperationException: Unexpected value ' at at Microsoft.CodeAnalysis.TaggedTextExtensions.ToClassificationTypeName(String taggedTextTag)

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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The problem happened in Microsoft.CodeAnalysis.TaggedTextExtensions.ToClassificationTypeName(String taggedTextTag) at the time I inserted a certain library assembly name on my code it has triggered a yellow banner below top menu ribbon with this error

here is the log

1992 2019/12/05 18:22:14.016 Error Editor or Editor Extension System.InvalidOperationException: Unexpected value 'ContainerStart' of type 'System.String' at Microsoft.CodeAnalysis.TaggedTextExtensions.ToClassificationTypeName(String taggedTextTag) at Microsoft.CodeAnalysis.Editor.Shared.Extensions.ClassificationExtensions.ToClassificationSpans(IEnumerable`1 parts, ITextSnapshot textSnapshot, ClassificationTypeMap typeMap) at Microsoft.CodeAnalysis.Editor.Implementation.IntelliSense.SignatureHelp.Presentation.SignatureHelpClassifier.GetClassificationSpans(SnapshotSpan span) at Microsoft.VisualStudio.Text.Classification.Implementation.ClassifierTagger.<GetTags>d__5.MoveNext() at Microsoft.VisualStudio.Text.Tagging.Implementation.TagAggregator`1.<GetTagsForBuffer>d__47.MoveNext()

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Original Comments

Visual Studio Feedback System on 12/9/2019, 02:26 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

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Original Solutions

(no solutions)

[valimaties]

I have the same error, using InformationBox project from GitHub. When Intellisense opens popup, yellow banner shows which shows me a link to the error file, indicating this error:

System.InvalidOperationException: Unexpected value 'ContainerStart' of type 'System.String' at Microsoft.CodeAnalysis.TaggedTextExtensions.ToClassificationTypeName(String taggedTextTag) at Microsoft.CodeAnalysis.Editor.Shared.Extensions.ClassificationExtensions.ToClassificationSpans(IEnumerable1 parts, ITextSnapshot textSnapshot, ClassificationTypeMap typeMap) at Microsoft.CodeAnalysis.Editor.Implementation.IntelliSense.SignatureHelp.Presentation.SignatureHelpClassifier.GetClassificationSpans(SnapshotSpan span) at Microsoft.VisualStudio.Text.Classification.Implementation.ClassifierTagger.<GetTags>d__5.MoveNext() at Microsoft.VisualStudio.Text.Tagging.Implementation.TagAggregator1.d__47.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

[chhornung]

I just got a very similar error in V 16.8.3 (experimental instance with all third-party extensions disabled) and tracked it down to a very specific situation: It happens when entering a comma in the argument list of an attribute constructor call when the XML doc summary of that constructor contains a bullet list.

Example code to reproduce (I placed this in a new .NET Framework 4.8 C# Console App project):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp10
{
    class Program
    {
        // Place caret here and delete and re-enter the comma to trigger the error:
        //     v
        [Test(1, 2)]
        static void Main(string[] args)
        {
        }
    }

    class TestAttribute : Attribute
    {
        /// <summary>
        /// <list type="bullet">
        /// <item><description>Item 1</description></item>
        /// <item><description>Item 2</description></item>
        /// </list>
        /// </summary>
        public TestAttribute(int a, int b)
        {
        }
    }
}

Error message: InvalidOperationException: Unexpected value 'ContainerStart' of type 'System.String'

Log file attached. ActivityLog.xml.log

[kzrnm]

Is it the same problem as #50114 ?