c#中typeof

C＃typeof()运算符 (C# typeof() Operator)

typeof() is an operator in C#, it is used to get the type (system type) of with class name of a given type. By using typeof() operator, we can get the name of the type, namespace name. It works with only compile-time known types. typeof() operator does not work with the variables or instances.

typeof()是C＃中的运算符，用于获取具有给定类型的类名的类型(系统类型)。 通过使用typeof()运算符 ，我们可以获得类型的名称，即名称空间名称。 它仅适用于编译时已知的类型。 typeof()运算符不适用于变量或实例。

If you want to get the type of a variable, you can use GetType() method.

如果要获取变量的类型，可以使用GetType()方法。

There are main 3 properties to get the details about the type:

主要的3个属性可获取有关类型的详细信息：

1. typeof(type).Name or this.GetType().Name – It returns the class name only.

   typeof(type).Name或this.GetType()。Name –仅返回类名称。

2. typeof(type).FullName or this.GetType().FullName – It returns the class name along with the namespace.

   typeof(type).FullName或this.GetType()。FullName –返回类名和名称空间。

3. typeof(type).Namespace or this.GetType().Namespace – It returns the namespace only.

   typeof(type).Namespace或this.GetType()。Namespace –仅返回名称空间。

Note: If we do not use any property, by default typeof(type) or this.GetType() returns the FullName.

注意：如果不使用任何属性，则默认为typeof(type)或this.GetType()返回FullName 。

Syntax:

句法：

System.type typeof(type);    or    System.type this.GetType();

Example:

例：

typeof(int)     - System.Int32    int a = 10;    a.GetType()     - System.Int32

Example 1: print the Name, FullName, Namespace name of the compile-time known types.

示例1：打印编译时已知类型的Name，FullName，Namespace名称。

using System;using System.Text;namespace Test{
       class Program    {
           static void Main(string[] args)        {
               Console.WriteLine("for char type...");            Console.WriteLine("default: " + typeof(char));            Console.WriteLine("Name: " + typeof(char).Name);            Console.WriteLine("FullName: " + typeof(char).FullName);            Console.WriteLine("Namespace: " + typeof(char).Namespace);            Console.WriteLine();            Console.WriteLine("for Int32 type...");            Console.WriteLine("default: " + typeof(Int32));            Console.WriteLine("Name: " + typeof(Int32).Name);            Console.WriteLine("FullName: " + typeof(Int32).FullName);            Console.WriteLine("Namespace: " + typeof(Int32).Namespace);            Console.WriteLine();            Console.WriteLine("for bool type...");            Console.WriteLine("default: " + typeof(bool));            Console.WriteLine("Name: " + typeof(bool).Name);            Console.WriteLine("FullName: " + typeof(bool).FullName);            Console.WriteLine("Namespace: " + typeof(bool).Namespace);            Console.WriteLine();            //hit ENTER to exit            Console.ReadLine();        }    }}

Output

输出量

for char type...default: System.CharName: CharFullName: System.CharNamespace: Systemfor Int32 type...default: System.Int32Name: Int32FullName: System.Int32Namespace: Systemfor bool type...default: System.BooleanName: BooleanFullName: System.BooleanNamespace: System

Example 2: print the Name, FullName, Namespace name of the variables.

示例2：打印变量的名称，全名，命名空间名称。

using System;using System.Text;namespace Test{
       class Program    {
           //structure        struct student        {
               private string name;            private int age;        };        static void Main(string[] args)        {
               char a = 'X';            int b = 10;            bool c = false;            Console.WriteLine("for variable \'a\'...");            Console.WriteLine("default: " + a.GetType());            Console.WriteLine("Name: " + a.GetType().Name);            Console.WriteLine("FullName: " + a.GetType().FullName);            Console.WriteLine("Namespace: " + a.GetType().Namespace);            Console.WriteLine();            Console.WriteLine("for variable \'b\'...");            Console.WriteLine("default: " + b.GetType());            Console.WriteLine("Name: " + b.GetType().Name);            Console.WriteLine("FullName: " + b.GetType().FullName);            Console.WriteLine("Namespace: " + b.GetType().Namespace);            Console.WriteLine();            Console.WriteLine("for variable \'c\'...");            Console.WriteLine("default: " + c.GetType());            Console.WriteLine("Name: " + c.GetType().Name);            Console.WriteLine("FullName: " + c.GetType().FullName);            Console.WriteLine("Namespace: " + c.GetType().Namespace);            Console.WriteLine();            student std = new student();            Console.WriteLine("for structure \'std\'...");            Console.WriteLine("default: " + std.GetType());            Console.WriteLine("Name: " + std.GetType().Name);            Console.WriteLine("FullName: " + std.GetType().FullName);            Console.WriteLine("Namespace: " + std.GetType().Namespace);            Console.WriteLine();            //hit ENTER to exit            Console.ReadLine();        }    }}

Output

输出量

for variable 'a'...default: System.CharName: CharFullName: System.CharNamespace: Systemfor variable 'b'...default: System.Int32Name: Int32FullName: System.Int32Namespace: Systemfor variable 'c'...default: System.BooleanName: BooleanFullName: System.BooleanNamespace: Systemfor structure 'std'...default: Test.Program+studentName: studentFullName: Test.Program+studentNamespace: Test

翻译自:

c#中typeof