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Dynamic Expresso

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18 Jan 2015MIT11 min read 80.3K   935   72  
Generate LambdaExpression or function delegate on the fly without compilation.
using System;
using System.Linq.Expressions;
using System.Reflection;

namespace DynamicExpresso.Visitors
{
	public class DisableReflectionVisitor : ExpressionVisitor
	{
		protected override Expression VisitMethodCall(MethodCallExpression node)
		{
			if (node.Object != null
				&& (typeof(Type).IsAssignableFrom(node.Object.Type)
				|| typeof(MemberInfo).IsAssignableFrom(node.Object.Type)))
			{
				throw new ReflectionNotAllowedException();
			}

			return base.VisitMethodCall(node);
		}

		protected override Expression VisitMember(MemberExpression node)
		{
			if ((typeof(Type).IsAssignableFrom(node.Member.DeclaringType)
				|| typeof(MemberInfo).IsAssignableFrom(node.Member.DeclaringType))
				&& node.Member.Name != "Name")
			{
				throw new ReflectionNotAllowedException();
			}

			return base.VisitMember(node);
		}
	}
}

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