C#中typeof 与GetType()的区别
C#中typeof 与GetType()的区别typeof是运算符,获得某一类型的System.Type对象;GetType是方法,获取当前实例的类型.
一、typeof 与GetType()的区别
1、Typeof是运算符而是方法
2、GetType()是基类System.Object的方法,因此只有建立一个实例之后才能够被调用(初始化以后)
3、Typeof的参数只能是int,string,String,自定义类型,且不能是实例
4、GetType()和typeof都返回System.Type的引用.
5、TypeOf():得到一个Class的Type
6、 GetType():得到一个Class的实例的Type
二、typeof 与GetType()的实例
实例1:
int i = 5;
Console.WriteLine(i.GetType());//System.Int32
var x = 127.25m;
Console.WriteLine(x.GetType());//System.Decimal
实例2:
namespace _2011._12._15
{
class Program
{
static void Main(string[] args)
{
Test testone = new Test();
string s = testone.GetType().ToString();
Console.WriteLine("GetType():");
Console.WriteLine(s);//_2011._12._15.Test 命名空间的Test类
Type type = typeof(Test);
Console.WriteLine("Typeof():");
Console.WriteLine(type);//_2011._12._15.Test 命名空间的Test类
Console.WriteLine();
MethodInfo[] methodinfo = type.GetMethods();
Console.WriteLine(methodinfo.GetType());//System.Reflection.MethodInfo[]
foreach (var i in methodinfo)
{
Console.WriteLine(i);//输出Test类的所有方法及继承Object的实例方法
}
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
MemberInfo[] memberinfo = type.GetMembers();
Console.WriteLine(memberinfo.GetType());
foreach(var i in memberinfo)
{
Console.WriteLine(i);//输出Test类字段和System.type类型
}
}
}
class Test
{
private int age;
public string name;
public void speaking()
{
Console.WriteLine("Welcome to cnblog!");
}
public void writing()
{
Console.WriteLine("Please writing something!");
}
}
}
运行结果:
GetType():
_2011._12._15.Test
Typeof():
_2011._12._15.Test
System.Reflection.MethodInfo[]
Void speaking()
Void writing()
System.Type GetType()
System.String ToString()
Boolean Equals(System.Object)
Int32 GetHashCode()
System.Reflection.MemberInfo[]
Void speaking()
Void writing()
System.Type GetType()
System.String ToString()
Boolean Equals(System.Object)
Int32 GetHashCode()
Void .ctor()
System.String name