C# 从 List<T> 到数组 T[] 的转换
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Conversion from List<T> to array T[]
提问by tehvan
Is there a short way of converting a strongly typed List<T>to an Array of the same type, e.g.: List<MyClass>to MyClass[]?
是否有将强类型转换为List<T>相同类型的数组的简短方法，例如：List<MyClass>to MyClass[]？
By short i mean one method call, or at least shorter than:
简而言之，我的意思是一种方法调用，或者至少短于：
MyClass[] myArray = new MyClass[list.Count];
int i = 0;
foreach (MyClass myClass in list)
{
myArray[i++] = myClass;
}
采纳答案by Nikos Steiakakis
Try using
尝试使用
MyClass[] myArray = list.ToArray();
回答by Brian Rasmussen
Use ToArray()on List<T>.
使用ToArray()上List<T>。
回答by Sessiz Saat
List<int> list = new List<int>();
int[] intList = list.ToArray();
is it your solution?
这是你的解决方案吗？
回答by Nipuna
You can simply use ToArray()extension method
您可以简单地使用ToArray()扩展方法
Example:
例子：
Person p1 = new Person() { Name = "Person 1", Age = 27 };
Person p2 = new Person() { Name = "Person 2", Age = 31 };
List<Person> people = new List<Person> { p1, p2 };
var array = people.ToArray();
The elements are copied using
Array.Copy(), which is an O(n) operation, where n is Count.
使用 复制元素
Array.Copy()，这是一个 O(n) 操作，其中 n 是计数。
回答by DragonSpit
To go twice as fast by using multiple processor cores HPCsharp nuget package provides:
为了通过使用多个处理器内核将速度提高一倍，HPCsharp nuget 包提供：
list.ToArrayPar();
回答by DragonSpit
One possible solution to avoid, which uses multiple CPU cores and expected to go faster, yet it performs about 5X slower:
一种可能要避免的解决方案，它使用多个 CPU 内核，预计速度会更快，但它的执行速度要慢 5 倍：
list.AsParallel().ToArray();
