string.ToCharArray() 是否需要枚举？
到底为什么有人会在枚举字符串中的字符之前将其转换为 char[] 呢？网络上随处可见的初始化 System.Security.SecureString 的常规模式如下：
SecureString secureString = new SecureString();
foreach (char c in "fizzbuzz".ToCharArray())
{
secureString.AppendChar(c);
}
调用 ToCharArray() 对我来说没有任何意义。有人能告诉我这里是否错了吗？
Why on Earth would someone convert a string to a char[] before enumerating the characters in it? The regular pattern for initializing a System.Security.SecureString found all around the net follows:
SecureString secureString = new SecureString();
foreach (char c in "fizzbuzz".ToCharArray())
{
secureString.AppendChar(c);
}
Calling ToCharArray() makes no sense for me. Could someone tell whether I am wrong here?
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由于
string实现了IEnumerable，因此在此上下文中没有必要。您唯一需要ToCharArray的时候是您实际上需要一个数组的时候。我的猜测是，大多数调用
ToCharArray的人不知道string实现了IEnumerable（尽管据我所知它总是如此） 。Since
stringimplementsIEnumerable<char>, it's not necessary in this context. The only time you needToCharArrayis when you actually need an array.My guess is that most people who call
ToCharArraydon't know thatstringimplementsIEnumerable(even though as far as I know it always has).实际上这很糟糕，因为它
很多不必要的工作...
那是因为字符串是不可变的，并且不允许给出指向其内部数组的指针，所以ToCharArray() 进行复制而不是强制转换。
也就是说：
您可以将字符串枚举为 char[] 但是：
您不能：
如果您要枚举并希望在某个时刻中断，则通过使用 toCharArray() 已经枚举了整个字符串 nad 复制了所有字符。如果绳子很大的话，那就很贵了……
Actually that is bad because it
A lot of unnecessary work...
That's because strings are immutable, and giving out a pointer to its internal array is not allowed, so ToCharArray() makes a copy instead of a cast.
That is:
you can enumerate a string as a char[] but:
you cannot:
If you would go enumerating and would want to break at some point, by using the toCharArray() would already have enumerated the whole string nad made a copy of all chars. If the string would be very big, that is quite expensive...