我如何使用反射创建一个C＃阵列和专用型的信息？ [英] How do I create a C# array using Reflection and only type info?

问题描述

我无法弄清楚如何使这项工作：

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

有什么秘诀？我可以做第二个工作，如果我能得到的数组的元素的类型，但我还没有想出了一出无论是。

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

我想补充到乔恩的答案。究其原因尝试失败，1是因为有一个为没有默认构造函数的Int32 [] 。您需要提供的长度。如果你使用过载，这需要一个参数数组，将工作：

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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