entity framework core - Scaffold-DbContext returns System.ArgumentNullException: Parameter name: proposedIdentifier in EFCore 2.0 when trying to pluralize -


when run command scaffold-dbcontext "server=localhost;database=mydatabase;integrated security=true" microsoft.entityframeworkcore.sqlserver

i error:

system.argumentnullexception: value cannot null. parameter name: proposedidentifier    @ microsoft.entityframeworkcore.utilities.check.notempty(string value, string parametername)    @ microsoft.entityframeworkcore.scaffolding.internal.csharputilities.uniquifier(string proposedidentifier, icollection`1 existingidentifiers)    @ microsoft.entityframeworkcore.scaffolding.internal.csharputilities.generatecsharpidentifier(string identifier, icollection`1 existingidentifiers, func`2 singularizepluralizer, func`3 uniquifier)    @ microsoft.entityframeworkcore.scaffolding.internal.csharputilities.generatecsharpidentifier(string identifier, icollection`1 existingidentifiers, func`2 singularizepluralizer)    @ microsoft.entityframeworkcore.scaffolding.internal.csharpnamer`1.getname(t item)    @ microsoft.entityframeworkcore.scaffolding.internal.csharpuniquenamer`1.getname(t item)    @ microsoft.entityframeworkcore.scaffolding.internal.relationalscaffoldingmodelfactory.getentitytypename(databasetable table)    @ microsoft.entityframeworkcore.scaffolding.internal.relationalscaffoldingmodelfactory.visittable(modelbuilder modelbuilder, databasetable table)    @ microsoft.entityframeworkcore.scaffolding.internal.relationalscaffoldingmodelfactory.visittables(modelbuilder modelbuilder, icollection`1 tables)    @ microsoft.entityframeworkcore.scaffolding.internal.relationalscaffoldingmodelfactory.visitdatabasemodel(modelbuilder modelbuilder, databasemodel databasemodel)    @ microsoft.entityframeworkcore.scaffolding.internal.relationalscaffoldingmodelfactory.createfromdatabasemodel(databasemodel databasemodel, boolean usedatabasenames)    @ microsoft.entityframeworkcore.scaffolding.internal.relationalscaffoldingmodelfactory.create(string connectionstring, ienumerable`1 tables, ienumerable`1 schemas, boolean usedatabasenames)    @ microsoft.entityframeworkcore.scaffolding.internal.modelscaffolder.generate(string connectionstring, ienumerable`1 tables, ienumerable`1 schemas, string projectpath, string outputpath, string rootnamespace, string contextname, boolean usedataannotations, boolean overwritefiles, boolean usedatabasenames)    @ microsoft.entityframeworkcore.design.internal.databaseoperations.scaffoldcontext(string provider, string connectionstring, string outputdir, string dbcontextclassname, ienumerable`1 schemas, ienumerable`1 tables, boolean usedataannotations, boolean overwritefiles, boolean usedatabasenames)    @ microsoft.entityframeworkcore.design.operationexecutor.scaffoldcontextimpl(string provider, string connectionstring, string outputdir, string dbcontextclassname, ienumerable`1 schemafilters, ienumerable`1 tablefilters, boolean usedataannotations, boolean overwritefiles, boolean usedatabasenames)    @ microsoft.entityframeworkcore.design.operationexecutor.scaffoldcontext.<>c__displayclass0_1.<.ctor>b__0()    @ microsoft.entityframeworkcore.design.operationexecutor.operationbase.<>c__displayclass3_0`1.<execute>b__0()    @ microsoft.entityframeworkcore.design.operationexecutor.operationbase.execute(action action) value cannot null. parameter name: proposedidentifier.

in startup project have:

public class custompluralizerdesigntimeservices : idesigntimeservices {     public void configuredesigntimeservices(iservicecollection services)     {         services.addsingleton<ipluralizer, humanizertoipluralizeradapter>();     } }  public class humanizertoipluralizeradapter : ipluralizer {     public string pluralize(string name) => name.pluralize();      public string singularize(string name) => name.singularize(); }

when remove code, scaffolding works.

dependencies:

  • dataaccess project (.net standard 2.0)

    • microsoft.entityframeworkcore.sqlserver 2.0
    • microsoft.entityframeworkcore.tools
    • microsoft.visualstudio.web.codegeneration.design

  • startup project (.net core 2.0)

    • microsoft.aspnetcore.all

looks bug in ipluralizer implementation. ensure it's not returning null or empty string values.


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