问题描述
我正在从数据库中提取 varchar 值并想设置 string 如果它们是 null 我将它们分配为">.我目前正在这样做:
I am pulling varchar values out of a DB and want to set the string I am assigning them to as "" if they are null. I'm currently doing it like this:
if (string.IsNullOrEmpty(planRec.approved_by) == true)
this.approved_by = "";
else
this.approved_by = planRec.approved_by.toString();
似乎应该有一种方法可以在一行中执行此操作，例如:
There seems like there should be a way to do this in a single line something like:
this.approved_by = "" || planRec.approved_by.toString();
但是我找不到最佳方法来做到这一点.有没有更好的方法或者我有什么最好的方法来做到这一点?
However I can't find an optimal way to do this. Is there a better way or is what I have the best way to do it?
推荐答案
试试这个:
this.approved_by = IsNullOrEmpty(planRec.approved_by) ? "" : planRec.approved_by.toString();
您也可以像其他人所说的那样使用空合并运算符 - 因为没有人给出适用于您的代码的示例，这里是一个:
You can also use the null-coalescing operator as other have said - since no one has given an example that works with your code here is one:
this.approved_by = planRec.approved_by ?? planRec.approved_by.toString();
但此示例仅适用于 this.approved_by 的可能值与您希望将其设置为的潜在值之一相同.对于所有其他情况，您将需要使用我在第一个示例中展示的条件运算符.
But this example only works since a possible value for this.approved_by is the same as one of the potential values that you wish to set it to. For all other cases you will need to use the conditional operator as I showed in my first example.
这篇关于检查空值的最短方法，如果不是，则分配另一个值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！