如何使用反射和仅类型信息创建 C# 数组? [英] How do I create a C# array using Reflection and only type info?

问题描述

我不知道如何进行这项工作:

I can't figure out how to make this work:

object x = new Int32[7];
Type t = x.GetType();

// now forget about x, and just use t from here.

// attempt1 
object y1 = Activator.CreateInstance(t); // fails with exception

// attempt2
object y2 = Array.CreateInstance(t, 7);  // creates an array of type Int32[][] ! wrong

秘诀是什么?如果我能得到数组元素的类型，我可以使第二个工作，但我也没有想出那个.

What's the secret sauce? I can make the second one work if I can get the type of the elements of the array, but I haven't figured that one out either.

推荐答案

只是为了补充 Jon 的答案.尝试 1 失败的原因是 Int32[] 没有默认构造函数.您需要提供一个长度.如果您使用带有参数数组的重载，它将起作用:

Just to add to Jon's answer. The reason attempt 1 fails is because there's no default constructor for Int32[]. You need to supply a length. If you use the overload, which takes an array of arguments it will work:

// attempt1 
object y1 = Activator.CreateInstance(t, new object[] { 1 }); // Length 1

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