我仍然怀疑对象.它是任何类,任何类的主要基类.但是它是引用类型还是值类型.还是喜欢这些行为呢?我需要澄清这一点.我很难理解.
object obj1 = "OldString"; object obj2 = obj1; obj1 = "NewString"; MessageBox.Show(obj1 + " " + obj2); //Output is "NewString OldString"
在这种情况下,它的行为就像一个值类型.如果对象是引用类型,那么为什么obj2值仍然是“OldString”
class SampleClass { public string Text { get; set; } } SampleClass Sample1 = new SampleClass(); Sample1.Text="OldText"; object refer1 = Sample1; object refer2 = refer1; Sample1.Text = "NewText"; MessageBox.Show((refer1 as SampleClass).Text + (refer2 as SampleClass).Text); //OutPut is "NewText NewText"
在这种情况下,它的作用就像参考类型
我们可以推断,对象的类型是你内部的框.它可以是引用类型和值类型.这是关于你的盒子里面.我对吗?
解决方法
它是一个参考类型
使用字符串做一个例子不是很明亮,因为字符串也是一个引用类型(显然是SampleClass);你的例子包含零“拳击”.
if object is reference type then why obj2 value is still “OldString”
为什么不这样?当您创建一个新的字符串时,不会更改旧的引用来指向新的字符串.考虑:
object obj1 = "OldString"; // create a new string; assign obj1 the reference to that new string "OldString" object obj2 = obj1; // copy the reference from obj1 and assign into obj2; obj2 now refers to // the same string instance obj1 = "NewString"; // create a new string and assign that new reference to obj1; note we haven't // changed obj2 - that still points to the original string,"OldString"