C＃如何使用反射调用一个字段初始值？ [英] C# how to invoke a field initializer using reflection?

问题描述

说我有这个C＃类

public class MyClass {
    int a;
    int[] b = new int[6];
}

现在说我使用反射发现这个类在注视领域，我觉得其中一人是数组类型（如：b）

Now say I discover this class using reflection and while looking at the fields I find that one of them is of type Array (ie: b)

foreach( FieldInfo fieldinfo in classType.GetFields() )
{
    if( fieldInfo.FieldType.IsArray )
    {
        int arraySize = ?;
        ...
    }
}

我知道这不是保证阵列具有创建该数组，但如果它，我想知道由场初始创建的阵列的大小的字段初始化

I know it's not guaranteed that the array has a field initializer that creates the array but if it does I would like to know the size of the array created by the field initializer.

是否有一个？方法调用字段初始

Is there a way to call the field initializer ?

如果有，我会做这样的事情：

If there was I would do something like this:

Array initValue = call field initializer() as Array;
int arraySize = initValue.Length;

唯一被我发现是创建整个类的实例，但我宁愿不这样做像这样的，因为它是矫枉过正...

The only was I found is to create an instance of the whole class but I would rather not do it like this as it's overkill...

推荐答案

好了，你不能。

下面的代码：

public class Test
{
    public int[] test = new int[5];

    public Test()
    {
        Console.Read();
    }
}

将被编译为：

will be compiled as:

public class Program
{
    public int[] test;

    public Program()
    {
        // Fields initializers are inserted at the beginning
        // of the class constructor
        this.test = new int[5];

        // Calling base constructor
        base.ctor();

        // Executing derived class constructor instructions
        Console.Read();
    }
}

所以，直到你创建类型的实例，有没有办法知道数组的大小。

So, until you create an instance of the type, there is no way to know about the array size.

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