如何将带有或条件的if语句转换为三元语句？

Question

我有这段代码

if (ScalarReturned is DBNull)
{
    xCount = 0;
}
else
{
    xCount = (Int32)ScalarReturned;
}

哪个很好但只是想转换为内联IF - 我试过下面但是得到了多个编译错误。有人可以协助吗？

if (ScalarReturned is DBNull) ? xCount = 0 : xCount = (Int32)ScalarReturned;

Answer 1

这样做：

xCount = ScalarReturned is DBNull || ScalarReturned == null ?  0 :
                                                          (Int32)ScalarReturned;

工作原理：

三元运算符有点像函数。这里唯一的问题是，您不需要return关键字。

用简单的英语：

如果满足第一个条件ScalarReturned is DBNull || ScalarReturned，则将0分配给xCount，否则分配:之后的内容

Answer 2

试试这个：

xCount = ScalarReturned is DBNull || ScalarReturned == null ? 0 : (Int32)ScalarReturned;

Answer 3

您没有正确使用三元运算符

试试这个：

xCount  = (ScalarReturned is DBNull || ScalarReturned == null) ?  0 : 
                                                     (Int32)ScalarReturned;

Answer 4

xCount = (ScalarReturned is DBNull || ScalarReturned == null) ? 0 : (Int32)ScalarReturned;(

Answer 5

三元运算符的工作原理如下：

condition ? true result : false result

xCount = (Int32)((ScalarReturned is DBNull || ScalarReturned == null) ? 0 : ScalarReturned);

Answer 6

您可以使用ScalarReturned == DBNull.Value上的? operator：

int xCount = ScalarReturned == DBNull.Value ? 0 : (Int32)ScalarReturned;