Unwrap TargetInvocationException

Author: bahusoid

src/NHibernate/Linq/Visitors/NhPartialEvaluatingExpressionVisitor.cs

@@ -18,6 +18,7 @@
 using System;
 using System.Linq;
 using System.Linq.Expressions;
+using System.Reflection;
 using NHibernate.Collection;
 using NHibernate.Engine;
 using NHibernate.Impl;
@@ -145,7 +146,14 @@ private Expression EvaluateSubtree(Expression subtree)
 				return constantExpression;
 			}
 
-			return Expression.Constant(ExpressionProcessor.FindValue(subtree), subtree.Type);
+			try
+			{
+				return Expression.Constant(ExpressionProcessor.FindValue(subtree), subtree.Type);
+			}
+			catch (TargetInvocationException ex)
+			{
+				throw ReflectHelper.UnwrapTargetInvocationException(ex);
+			}
 		}
 
 		#region NH additions