c# - Checking a Variable Type For Code Analysis -

what correct way check variable's type in roslyn code analyzer? registering objectcreationexpressionsyntax node , can type, not correct way check type care about.

i found way checking display string, wondering if there more correct way accomplish this. example, here code trying check arraylist creation.

private static void syntaxvalidator(syntaxnodeanalysiscontext context) {     var creation = (objectcreationexpressionsyntax)context.node;      var variabletype = creation.type identifiernamesyntax;      if (variabletype == null)         return;      var variabletypeinfo = context.semanticmodel.gettypeinfo(context.node);      if (variabletypeinfo.type != null && variabletypeinfo.type.todisplaystring().equals("system.collections.arraylist"))     {         context.reportdiagnostic(diagnostic.create(rule, creations.getlocation(), ""));     } }  

the normal pattern doing use compilation.gettypebymetadataname(), , compare itypesymbol 1 got semanticmodel.gettypeinfo().

note: make sure use .equals compare itypesymbol instances, of them not guarantee reference identity.

see: http://source.roslyn.io/roslyn.diagnostics.analyzers/r/fee46febeb0be269.html example of analyzer this.