转自：http://www.cnblogs.com/lm3515/archive/2010/09/02/1815725.html

 

typeof（C# 参考）

用于获取类型的 System.Type 对象。typeof 表达式采用以下形式：

System.Type type = typeof(int);

 备注

若要获取表达式的运行时类型，可以使用 .NET Framework 方法 GetType，如下所示：

int i = 0;System.Type type = i.GetType();

typeof 运算符也能用于公开的泛型类型。具有不止一个类型参数的类型的规范中必须有适当数量的逗号。不能重载 typeof 运算符。

 

 

示例 // cs_operator_typeof.csusing System;using System.Reflection;public class SampleClass{public int sampleMember;public void SampleMethod() {}static void Main(){Type t = typeof(SampleClass);// Alternatively, you could use// SampleClass obj = new SampleClass();// Type t = obj.GetType();Console.WriteLine("Methods:");MethodInfo[] methodInfo = t.GetMethods();foreach (MethodInfo mInfo in methodInfo)Console.WriteLine(mInfo.ToString());Console.WriteLine("Members:");MemberInfo[] memberInfo = t.GetMembers();foreach (MemberInfo mInfo in memberInfo)Console.WriteLine(mInfo.ToString());}}输出Methods:Void SampleMethod()System.Type GetType()System.String ToString()Boolean Equals(System.Object)Int32 GetHashCode()Members:Void SampleMethod()System.Type GetType()System.String ToString()Boolean Equals(System.Object)Int32 GetHashCode()Void .ctor()Int32 sampleMember此示例使用 GetType 方法确定用来包含数值计算的结果的类型。这取决于结果数字的存储要求。 // cs_operator_typeof2.csusing System;class GetTypeTest{static void Main(){int radius = 3;Console.WriteLine("Area = {0}", radius * radius * Math.PI);Console.WriteLine("The type is {0}",(radius * radius * Math.PI).GetType());}}输出Area = 28.2743338823081The type is System.Double