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                                  • I encountered a "'ParameterRefactoringsProvider' encountered an error and has been disabled" error in VS 2019.

                                    Details:

                                    System.ArgumentException : An item with the same key has already been added.
                                       at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
                                       at System.Collections.Generic.Dictionary`2.Insert(TKey key,TValue value,Boolean add)
                                       at DevExpress.CodeAnalysis.Refactorings.DecomposeParameter.DecomposeParameterHelper.get_HelperMap()
                                       at async DevExpress.CodeAnalysis.Refactorings.DecomposeParameter.DecomposeParameterRefactoringCore.Collect(<Unknown Parameters>)
                                       at async DevExpress.CodeAnalysis.Refactorings.DecomposeParameter.DecomposeParameterRefactoringCore.IsAvailableCore(<Unknown Parameters>)
                                       at async DevExpress.CodeAnalysis.Refactorings.DecomposeParameter.DecomposeParameterRefactoringCore.IsAvailable(<Unknown Parameters>)
                                       at async DevExpress.CodeAnalysis.Refactorings.RefactoringProvider.GetAvailableRefactorings(<Unknown Parameters>)
                                       at async DevExpress.CodeAnalysis.Refactorings.RefactoringProvider.ComputeRefactoringsAsync(<Unknown Parameters>)
                                       at async Microsoft.CodeAnalysis.CodeRefactorings.CodeRefactoringService.GetRefactoringFromProviderAsync(<Unknown Parameters>

                                    Project Type: C# Class Library, .NET Framework 4.6.1. The code loaded in the IDE editor is in the attachment. It was not in a compileable state.

                                • Pavel A (DevExpress) 06.28.2019

                                  Hello Olivier,

                                  Thank you for providing the stack trace and code sample.
                                  We will research this issue and notify you as soon as we have any results.

                                1 Solution

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                                Fixed: