Question

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

我想得到这个类型。

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，由于Type为System.Object，因此始终会出现错误行。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
    }

如何从UnaryExpression中获取Type？

1 个答案: