C#中的值赋值

Question

如果没有初始化,如何为数组赋值？

string[] s={"all","in","all"};

I mean why did not the compile show error?.Normally we need to 
initialize ,before assign values.

Answer 1

这只是语法糖.

这个:

string[] s = {"all","in","all"};

被编译为相同的代码:

string[] tmp = new string[3];
tmp[0] = "all";
tmp[1] = "in";
tmp[2] = "all";
string[] s = tmp;

请注意,在分配了s所有元素之前,不会分配数组引用.在我们宣布一个新变量的特殊情况下,这并不重要,但在这种情况下它会有所不同:

string[] s = { "first", "second" };
s = new string[] { s[1], s[0] };

对象和集合初始化器也是如此 - 变量仅在末尾分配.