c# 中是否默认通过引用传递数组或列表? [英] Are arrays or lists passed by default by reference in c#?

问题描述

是吗?或者为了加速我的程序，我应该通过引用传递它们吗?

Do they? Or to speed up my program should I pass them by reference?

推荐答案

引用 按值传递.

.NET 中的数组是堆上的对象，因此您有一个引用.该引用是按值传递的，这意味着调用者会看到对数组内容的更改，但重新分配数组不会:

Arrays in .NET are object on the heap, so you have a reference. That reference is passed by value, meaning that changes to the contents of the array will be seen by the caller, but reassigning the array won't:

void Foo(int[] data) {
    data[0] = 1; // caller sees this
}
void Bar(int[] data) {
    data = new int[20]; // but not this
}

如果您添加 ref 修饰符，引用 将通过引用传递 - 调用者将看到上述任一更改.

If you add the ref modifier, the reference is passed by reference - and the caller would see either change above.

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