如何将带有或条件的if语句转换为三元语句?

本文关键字：语句 转换 三元 if 条件 | 更新日期: 2023-09-27 17:52:59

我有这样的代码

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

工作得很好，但只是想转换为内联IF——我在下面尝试，但得到多个编译错误。有人能帮忙吗?

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

如何将带有或条件的if语句转换为三元语句?

这样做:

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

工作原理:

三元操作符的作用有点像函数。这里唯一的问题是，您不需要return关键字。

用简单的英语说:

如果满足第一个条件ScalarReturned is DBNull || ScalarReturned，则赋0给xCount，否则赋:之后的值

试试这个:

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

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;


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

三元运算符的操作如下:

condition ? true result : false result
xCount = (Int32)((ScalarReturned is DBNull || ScalarReturned == null) ? 0 : ScalarReturned);

您可以在ScalarReturned == DBNull.Value上使用?运算符:

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