SyntaxNodeExtensions.cs

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using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using System.Linq;
 
namespace Csla.Analyzers.Extensions
{
  internal static class SyntaxNodeExtensions
  {
    internal static bool HasUsing(this SyntaxNode @this, string qualifiedName)
    {
      if (@this == null)
      {
        return false;
      }
 
      if (@this.IsKind(SyntaxKind.UsingDirective))
      {
        var usingNode = @this as UsingDirectiveSyntax;
 
        if (usingNode.Name.ToFullString() == qualifiedName)
        {
          return true;
        }
      }
 
      return @this.ChildNodes().Where(_ => _.HasUsing(qualifiedName)).Any();
    }
 
    internal static T FindParent<T>(this SyntaxNode @this)
      where T : SyntaxNode
    {
      var parentNode = @this.Parent;
 
      while (parentNode != null)
      {
        if (parentNode is T parentAsTypeNode)
        {
          return parentAsTypeNode;
        }
 
        parentNode = parentNode.Parent;
      }
 
      return null;
    }
  }
}