C＃:使用像类型这样的变量意味着什么

Question

我是C＃的新手，来自JavaScript背景（因此'typing'对我来说是很新的）。

警告是什么……是一个变量，但像一种类型一样使用"？

我在称为 test的静态函数中具有以下代码：

var activeCell = new ExcelReference(1, 1);
Type type = typeof(activeCell);

Answer 1

您只能与类型一起使用typeof，例如Type type = typeof(ExcelReference);

如果您想知道该变量是什么类型，则使用Type type = activeCell.GetType();

Answer 2

实际上很容易。 typeof 与类，接口等名称一起使用，同时您需要的是 getType function。

示例：

public class MyObject
{
    public static Type GetMyObjectClassType()
    {
        return typeof(MyObject);
    }
    public static Type GetMyObjectInstanceType(MyObject someObject)
    {
        return someObject.GetType();
    }
    public static Type GetAnyClassType<GenericClass>()
    {
        return typeof(GenericClass);
    }
    public static Type GetAnyObjectInstanceType(object someObject)
    {
        return someObject.GetType();
    }
    public void Demo()
    {
        var someObject = new MyObject();
        Console.WriteLine(GetMyObjectClassType()); // will write the type of the class MyObject
        Console.WriteLine(GetMyObjectInstanceType(someObject)); // will write the type of your instance of MyObject called someObject
        Console.WriteLine(GetAnyClassType<MyObject>()); // will write the type of any given class, here MyObject
        Console.WriteLine(GetAnyClassType<System.Windows.Application>()); //  will write the type of any given class, here System.Windows.Application
        Console.WriteLine(GetAnyObjectInstanceType("test")); // will write the type of any given instance, here some string called "test"
        Console.WriteLine(GetAnyObjectInstanceType(someObject)); // will write the type of any given instance, here your instance of MyObject called someObject
    }
}