Linq/Visitors/NameUnNamedParameters.cs: Restore - we are not changing the assembly version, so we should not remove any symbols, even though they are no longer used.

Author: oskarb

src/NHibernate/Linq/Visitors/NameUnNamedParameters.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+
+namespace NHibernate.Linq.Visitors
+{
+    [Obsolete("This class is not required by NHibernate anymore.")]
+    public class NameUnNamedParameters : NhExpressionTreeVisitor
+    {
+        public static Expression Visit(Expression expression)
+        {
+            var visitor = new NameUnNamedParameters();
+
+            return visitor.VisitExpression(expression);
+        }
+
+        private readonly Dictionary<ParameterExpression, ParameterExpression> _renamedParameters = new Dictionary<ParameterExpression, ParameterExpression>();
+
+        protected override Expression VisitParameterExpression(ParameterExpression expression)
+        {
+            if (string.IsNullOrEmpty(expression.Name))
+            {
+                ParameterExpression renamed;
+                
+                if (_renamedParameters.TryGetValue(expression, out renamed))
+                {
+                    return renamed;
+                }
+
+                renamed = Expression.Parameter(expression.Type, Guid.NewGuid().ToString());
+
+                _renamedParameters.Add(expression, renamed);
+
+                return renamed;
+            }
+
+            return base.VisitParameterExpression(expression);
+        }
+    }
+}