如何在C＃中设置变量的默认值？

Question

I want to set a variable to a default value if the assignment returns null or something else.

string a = GetValue();

if GetValue returns null, then I want to have a default value for variable a, how to do that in c#. Try not using if.

Thanks for the time.

Answer 1

使用null合并运算符。

string a = GetValue() ?? "Default";

Answer 2

string a = GetValue() ?? "DefaultValue";

Answer 3

那将是

string a = GetValue() ?? "default value";

Answer 4

这个怎么样？

string a = GetValue() != null ? GetValue() : "default";

Answer 5

string a = GetValue() == null ? string.empty : GetValue();