如何从 UnaryExpression 中获取类型？

Question

我有一个属性定义为Expression<Func<Kitten, object>>，即c => c.KittenAge，其中KittenAge 是int?

我想得到这个的类型。

我的代码是：

Expression<Func<Kitten, object>> property = c => c.KittenAge;

var unaryExpression = property.Body as UnaryExpression;

if (Nullable.GetUnderlyingType(unaryExpression.Type) == null)
{
   // Error, must be nullable
}

不幸的是，总是会出现错误行，因为Type 是System.Object。如何从表达式中获取int? 的类型？

Answer 1

试试这个：

    Expression<Func<Kitten, object>> property = c => c.KittenAge;
    var unaryExpression = property.Body as UnaryExpression;
    var propertyExpression = unaryExpression.Operand as MemberExpression;

    if (Nullable.GetUnderlyingType(propertyExpression.Type) == null)
    {
      // Error, must be nullable
    }