C# 将 System.Array 转换为 string[]
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Convert System.Array to string[]
提问by KrisTrip
I have a System.Array that I need to convert to string[]. Is there a better way to do this than just looping through the array, calling ToString on each element, and saving to a string[]? The problem is I don't necessarily know the type of the elements until runtime.
我有一个 System.Array，我需要将其转换为 string[]。有没有比循环遍历数组、在每个元素上调用 ToString 并保存到字符串 [] 更好的方法呢？问题是我在运行之前不一定知道元素的类型。
采纳答案by Craig Stuntz
How about using LINQ?
使用LINQ怎么样？
string[] foo = someObjectArray.OfType<object>().Select(o => o.ToString()).ToArray();
回答by Marc Gravell
Is it just Array? Or is it (for example) object[]? If so:
只是Array吗？或者是（例如）object[]？如果是这样的话：
object[] arr = ...
string[] strings = Array.ConvertAll<object, string>(arr, Convert.ToString);
Note than any 1-d array of reference-types should be castable to object[](even if it is actually, for example, Foo[]), but value-types (such as int[]) can't be. So you could try:
请注意，任何引用类型的一维数组都应该可转换为object[]（即使它实际上是，例如，Foo[]），但值类型（例如int[]）不能。所以你可以试试：
Array a = ...
object[] arr = (object[]) a;
string[] strings = Array.ConvertAll<object, string>(arr, Convert.ToString);
But if it is something like int[], you'll have to loop manually.
但如果是类似的int[]，则必须手动循环。
回答by Amit Degadwala
You can use Array.ConvertAll, like this:
你可以使用Array.ConvertAll，像这样：
string[] strp = Array.ConvertAll<int, string>(arr, Convert.ToString);
回答by bougiefever
This can probably be compressed, but it gets around the limitation of not being able to use Cast<> or Linq Select on a System.Array type of object.
这可能可以压缩，但它绕过了无法在 System.Array 类型的对象上使用 Cast<> 或 Linq Select 的限制。
Type myType = MethodToGetMyEnumType();
Array enumValuesArray = Enum.GetValues(myType);
object[] objectValues new object[enumValuesArray.Length];
Array.Copy(enumValuesArray, objectValues, enumValuesArray.Length);
var correctTypeIEnumerable = objectValues.Select(x => Convert.ChangeType(x, t));
回答by Umut D.
Simple and basic approach;
简单而基本的方法；
Array personNames = Array.CreateInstance(typeof (string), 3);
// or Array personNames = new string[3];
personNames.SetValue("Ally", 0);
personNames.SetValue("Eloise", 1);
personNames.SetValue("John", 2);
string[] names = (string[]) personNames;
// or string[] names = personNames as string[]
foreach (string name in names)
Console.WriteLine(name);
Or just an another approach: You can use personNames.ToArraytoo:
或者只是另一种方法：您也可以使用personNames.ToArray：
string[] names = (string[]) personNames.ToArray(typeof (string));
