屬性是類，結構和接口的成員名稱。成員變量或者類中的方法或結構被稱為字段。屬性字段的擴展，並且使用相同的語法來訪問。它們通過使用其私有字段的值可以讀取，寫入或操縱訪問。

屬性不命名的存儲位置。相反，它們訪問的讀，寫，或計算它們的值。

例如，我們有一個名為Student類，使用年齡，姓名和代碼私有字段。從外部類的範圍我們無法直接訪問這些字段，但我們可以對訪問這些private字段屬性。

訪問器

屬性的訪問器包含了可執行語句，有助於獲得(閱讀或計算)或設置(寫)屬性。在訪問聲明可以包含一個get訪問，set訪問，或兩者兼而有之。例如：

// Declare a Code property of type string:
public string Code
{
   get
   {
      return code;
   }
   set
   {
      code = value;
   }
}

// Declare a Name property of type string:
public string Name
{
   get
   {
     return name;
   }
   set
   {
     name = value;
   }
}

// Declare a Age property of type int:
public int Age
{ 
   get
   {
      return age;
   }
   set
   {
      age = value;
   }
}

例子：

下麵的例子演示了屬性的使用：

using System;
namespace yiibai
{
   class Student
   {

      private string code = "N.A";
      private string name = "not known";
      private int age = 0;

      // Declare a Code property of type string:
      public string Code
      {
         get
         {
            return code;
         }
         set
         {
            code = value;
         }
      }
   
      // Declare a Name property of type string:
      public string Name
      {
         get
         {
            return name;
         }
         set
         {
            name = value;
         }
      }

      // Declare a Age property of type int:
      public int Age
      {
         get
         {
            return age;
         }
         set
         {
            age = value;
         }
      }
      public override string ToString()
      {
         return "Code = " + Code +", Name = " + Name + ", Age = " + Age;
      }
    }
    class ExampleDemo
    {
      public static void Main()
      {
         // Create a new Student object:
         Student s = new Student();
            
         // Setting code, name and the age of the student
         s.Code = "001";
         s.Name = "Zara";
         s.Age = 9;
         Console.WriteLine("Student Info: {0}", s);
         //let us increase age
         s.Age += 1;
         Console.WriteLine("Student Info: {0}", s);
         Console.ReadKey();
       }
   }
}

當上述代碼被編譯和執行時，它產生了以下結果：

Student Info: Code = 001, Name = Zara, Age = 9
Student Info: Code = 001, Name = Zara, Age = 10

抽象屬性

一個抽象類可以具有一個抽象屬性，它應該在派生類來實現。下麵的程序說明了這一點：

using System;
namespace yiibai
{
   public abstract class Person
   {
      public abstract string Name
      {
         get;
         set;
      }
      public abstract int Age
      {
         get;
         set;
      }
   }
   class Student : Person
   {

      private string code = "N.A";
      private string name = "N.A";
      private int age = 0;

      // Declare a Code property of type string:
      public string Code
      {
         get
         {
            return code;
         }
         set
         {
            code = value;
         }
      }
   
      // Declare a Name property of type string:
      public override string Name
      {
         get
         {
            return name;
         }
         set
         {
            name = value;
         }
      }

      // Declare a Age property of type int:
      public override int Age
      {
         get
         {
            return age;
         }
         set
         {
            age = value;
         }
      }
      public override string ToString()
      {
         return "Code = " + Code +", Name = " + Name + ", Age = " + Age;
      }
   }
   class ExampleDemo
   {
      public static void Main()
      {
         // Create a new Student object:
         Student s = new Student();
            
         // Setting code, name and the age of the student
         s.Code = "001";
         s.Name = "Zara";
         s.Age = 9;
         Console.WriteLine("Student Info:- {0}", s);
         //let us increase age
         s.Age += 1;
         Console.WriteLine("Student Info:- {0}", s);
         Console.ReadKey();
       }
   }
}

讓我們編譯和運行上麵的程序，這將產生以下結果：

Student Info: Code = 001, Name = Zara, Age = 9
Student Info: Code = 001, Name = Zara, Age = 10