C#使用API创建表达式树
示例
using System.Linq.Expressions;
//手动构建表达式树
// the lambda expression num => num < 5.
ParameterExpression numParam = Expression.Parameter(typeof(int), "num");
ConstantExpression five = Expression.Constant(5, typeof(int));
BinaryExpression numLessThanFive = Expression.LessThan(numParam, five);
Expression<Func<int, bool>> lambda1 =
Expression.Lambda<Func<int, bool>>(
numLessThanFive,
new ParameterExpression[] { numParam });