对象到字符串数组 [英] object to string array

问题描述

我正在尝试将一个对象(在此处声明为obj":对象是数组，原语)转换为字符串数组.

I am trying to convert an object (is declared here as 'obj': object is array, primitive) to a string array.

object 可以是任何 uint[]、int16[] 等.

object can be anything uint[], int16[], etc.

我一直在尝试使用

string[] str = Array.ConvertAll<object, string>((object[])obj, Convert.ToString);

当我尝试将未知类型的对象转换为 object[] 时会出现问题.我遇到了铸造错误.

The problem occurs when I try to cast the unknown type object into object[]. I have been getting casting error.

我做过的一次失败的尝试是使用

One attempt I made, which failed, was using

object[] arr = (object[])obj;

或

IEnumerable<object> list = obj as IEnumerable<object>
object[] arr = (object[])list;

我在转换时看到了关于值类型和引用类型问题的帖子.

I saw postings regarding value type and reference type issue on casting.

是否有一个简单的代码可以处理转换为 object[] 而不管对象的类型，只要它是一个数组?我试图避免手动处理所有可能的类型转换.

Would there be a simple code that can handle casting to object[] regardless of type of object, as long as it is an array ? I am trying to avoid manual handling of every possible type casting.

提前致谢

推荐答案

你可以使用每个数组都实现了 IEnumerable 的事实:

You can use the fact that every array implements IEnumerable:

string[] arr = ((IEnumerable)obj).Cast<object>()
                                 .Select(x => x.ToString())
                                 .ToArray();

这将在将基元转换为字符串之前适当地装箱.

This will box primitives appropriately, before converting them to strings.

转换失败的原因是尽管 reference 类型的数组是协变的，value 类型的数组不是:

The reason the cast fails is that although arrays of reference types are covariant, arrays of value types are not:

object[] x = new string[10]; // Fine
object[] y = new int[10]; // Fails

强制转换为 IEnumerable 也可以.哎呀，如果你愿意，你可以转换为 Array.

Casting to just IEnumerable will work though. Heck, you could cast to Array if you wanted.

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