AD0001: Occasional InvalidOperationException error in analyzer in IDE

[zlepper]

I'm not entirely sure what reproduces this, however I do occasionally get a ton of these analyzer errors in the same file:

AD0001: Analyzer 'NUnit.Analyzers.ConstActualValueUsage.ConstActualValueUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: ConfigService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2007

It only seems to happen in my IDE (At least I have never seen it happen when doing dotnet build), and it usually goes away pretty fast. I would guess it happens because of some code that is invalid for a short moment. When the error occurs the entire screen overflows with errors at once.

I can't send you a file it happens on, as I cannot share code from work, but it seems to usually be larger test files.

NUnit version: 4.2.2
NUnit.Analyzers version: 4.4.0

Using JetBrains Rider with dotnet version 8.0.303.

I'm sorry that it's not a whole lot to work from :(

[zlepper]

Here's a larger chunk of errors:

AD0001: Analyzer 'NUnit.Analyzers.NullConstraintUsage.NullConstraintUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2023
AD0001: Analyzer 'NUnit.Analyzers.IgnoreCaseUsage.IgnoreCaseUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2008
AD0001: Analyzer 'NUnit.Analyzers.ConstraintUsage.EqualConstraintUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2010
AD0001: Analyzer 'NUnit.Analyzers.WithinUsage.WithinUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2047
AD0001: Analyzer 'NUnit.Analyzers.SameActualExpectedValue.SameActualExpectedValueAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2009
AD0001: Analyzer 'NUnit.Analyzers.ClassicModelAssertUsage.ClassicModelAssertUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2001, NUnit2002, NUnit2003, NUnit2004, NUnit2005, NUnit2006, NUnit2015, NUnit2016, NUnit2017, NUnit2018, NUnit2019, NUnit2027, NUnit2028, NUnit2029, NUnit2030, NUnit2031, NUnit2032, NUnit2033, NUnit2034, NUnit2035, NUnit2036, NUnit2037, NUnit2038, NUnit2039
AD0001: Analyzer 'NUnit.Analyzers.SameAsIncompatibleTypes.SameAsIncompatibleTypesAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2020
AD0001: Analyzer 'NUnit.Analyzers.StringAssertUsage.StringAssertUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2048
AD0001: Analyzer 'NUnit.Analyzers.ConstraintUsage.StringConstraintUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2011, NUnit2012, NUnit2013
AD0001: Analyzer 'NUnit.Analyzers.EqualToIncompatibleTypes.EqualToIncompatibleTypesAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2021
AD0001: Analyzer 'NUnit.Analyzers.SameAsOnValueTypes.SameAsOnValueTypesAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2040
AD0001: Analyzer 'NUnit.Analyzers.ConstraintUsage.SomeItemsConstraintUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2014
AD0001: Analyzer 'NUnit.Analyzers.StringConstraintWrongActualType.StringConstraintWrongActualTypeAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2024
AD0001: Analyzer 'NUnit.Analyzers.SomeItemsIncompatibleTypes.SomeItemsIncompatibleTypesAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2026
AD0001: Analyzer 'NUnit.Analyzers.ClassicModelAssertUsage.ClassicModelAssertUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2001, NUnit2002, NUnit2003, NUnit2004, NUnit2005, NUnit2006, NUnit2015, NUnit2016, NUnit2017, NUnit2018, NUnit2019, NUnit2027, NUnit2028, NUnit2029, NUnit2030, NUnit2031, NUnit2032, NUnit2033, NUnit2034, NUnit2035, NUnit2036, NUnit2037, NUnit2038, NUnit2039, NUnit2051, NUnit2052, NUnit2053, NUnit2054
AD0001: Analyzer 'NUnit.Analyzers.ComparableTypes.ComparableTypesAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2041, NUnit2042
AD0001: Analyzer 'NUnit.Analyzers.DelegateRequired.DelegateRequiredAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2044
AD0001: Analyzer 'NUnit.Analyzers.MissingProperty.MissingPropertyAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2022
AD0001: Analyzer 'NUnit.Analyzers.UpdateStringFormatToInterpolatableString.UpdateStringFormatToInterpolatableStringAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2050
AD0001: Analyzer 'NUnit.Analyzers.CollectionAssertUsage.CollectionAssertUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2049
AD0001: Analyzer 'NUnit.Analyzers.UseCollectionConstraint.UseCollectionConstraintAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2046
AD0001: Analyzer 'NUnit.Analyzers.ConstActualValueUsage.ConstActualValueUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2007
AD0001: Analyzer 'NUnit.Analyzers.ConstraintUsage.ComparisonConstraintUsageAnalyzer' threw an exception of type 'System.InvalidOperationException' with message 'Sequence contains more than one matching element'. Exception occurred with following context: Compilation: Digizuite.ConfigurationManagementService.Tests System.InvalidOperationException: Sequence contains more than one matching element at System.Linq.ThrowHelper.ThrowMoreThanOneMatchException() at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found) at NUnit.Analyzers.BaseAssertionAnalyzer.AnalyzeCompilationStart(CompilationStartAnalysisContext context) at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock[TArg](DiagnosticAnalyzer analyzer, Action`1 analyze, TArg argument, Nullable`1 info, CancellationToken cancellationToken) in Z:\BuildAgent\work\3b7ce003563d6f8f\src\Compilers\Core\Portable\DiagnosticAnalyzer\AnalyzerExecutor.cs:line 1191 ----- Suppress the following diagnostics to disable this analyzer: NUnit2043

[manfred-brands]

Looking at the stack trace and code, this could indicate that you reference nunit.framework more than once.

I agree it shouldn't throw an exception, so I will change the code to not use .Single

[zlepper]

Through using (import) statements? That might be the case, but I'm not seeing any particular duplicates there in our files, we are generally adding the using statements through "global using".

[manfred-brands]

No, multiple Package reference of the NUnit nuget package.

Possible error source line

[zlepper]

We are having projects that depends on projects where both reference nunit directly, so that is certainly possible.