三元运算符? [英] Ternary Operator ?

问题描述

我有两种方法可以得到结果吗?
例如三元运算符

字符串mystring =(textbox1.Text ==")? "X"一些布尔== true:"O";
请帮忙???
两个结果"X"和Somebool是结果

Is there a way for me to have two results
for a ternary Operator for Example

string mystring = (textbox1.Text == "")? "X" some bool == true :"O";
help please ???
two results "X" and Somebool being the results

推荐答案

否.这等效于if-else运算符，有两种选择.您总是返回一个或另一个结果，而不会两者都返回.

—SA

No. This is equivalent to if-else operator with exactly two alternatives. You always return one result or another, never both.

—SA

您可以测试2个条件，并得出2种可能的结果:

You can test 2 conditions and have 2 possible results with that:

string mystring = textbox1.Text == "" && some_bool == true ? "X" : "O";

在这种情况下，如果同时满足两个条件，mystring 将为"X"，否则为"0"(1或不满足条件)

或者，您可以进行2次测试，并得到3个结果，如下所示:

In that case mystring will be "X" if both conditions are met and "0" otherwise (1 or no condition met)

Or you can do 2 test and have 3 results like this:

string mystring = textbox1.Text == "" ? "X" : some_bool ? "*" : "0";

在这种情况下，如果字符串为空，则mystring 将为"X".否则，如果some_bool为true，则为"*"；否则为"O".



在C ++中，可以使用逗号运算符设置2个值，但这在C#中无效.无论如何，不​​建议使用这种构造，因为它会使代码的可维护性降低.

In that case mystring will be "X" if the string is empty. Otherwise, it will be "*" if some_bool is true and "O" if not.



In C++, it would be possible to set 2 values using comma operator but this is not valid in C#. Anyway, such construct are not recommended as it make the code less maintainable.

// Only in C++
bool some_bool = false;
String ^mystring = textbox1.Text == String::Empty ? (some_bool = true, "X") : "O";

如果字符串为空，则mystring和some_bool都将被更新.这不会在C#中编译(即使删除^后也是如此).


您的问题不清楚...

If the string is empty, then both mystring and some_bool would get updated. This does not compile in C# (even after removing the ^).


Your question is not clear...

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