通过反射得到绑定在类的属性上的特性信息

来源：互联网发布：java ee课件编辑：程序博客网时间：2024/05/21 10:22

标题够绕的：)

using System;
using System.Reflection;
using System.Collections;

// 特性类

public class CoTestAttribute : Attribute
{
string m_attributeName1;

    public string AttributeName1
    {
        get{return m_attributeName1;}
        set{m_attributeName1 = value;}
    }
}

// 正常类

public class CoTestClass
{
string m_classProperty1;

    [CoTest(AttributeName1="attribute value")]
    public string ClassProperty1
    {
        get{return m_classProperty1;}
        set{m_classProperty1 = value;}
    }
}

class MainClass
{
# region 正确结果

    // 通过类型
    Type classType1 = typeof(CoTestClass);
    PropertyInfo PI1 = classType1.GetProperty("ClassProperty1");
    object[] resultArray1 = PI1.GetCustomAttributes(typeof(CoTestAttribute), false);
    CoTestAttribute result1 = resultArray1[0] as CoTestAttribute;
    Console.WriteLine("得到正确信息: " + result1.AttributeName1);
    Console.WriteLine();

  // 通过实例
    CoTestClass classInstance1 = new CoTestClass();
    classInstance1.ClassProperty1 = "property value";
    PropertyInfo instancePI = classInstance1.GetType().GetProperty("ClassProperty1");
    object[] resultArray2 = instancePI.GetCustomAttributes(typeof(CoTestAttribute), false);
    CoTestAttribute result2 = resultArray2[0] as CoTestAttribute;
    Console.WriteLine("得到正确信息: " + result2.AttributeName1);
    Console.WriteLine();

# endregion

# region 错误结果

    // 通过类型
    Type classType2 = typeof(CoTestClass);
    object[] errorResult1 = classType2.GetCustomAttributes(typeof(CoTestAttribute), false);
    if(errorResult1.Length == 0)
    {
       Console.WriteLine("未得到需要的信息!");
    }
    Console.WriteLine();

    // 通过实例
    CoTestClass classInstance2 = new CoTestClass();
    classInstance2.ClassProperty1 = "property value";
    object[] errorResult2 = classInstance2.GetType().GetCustomAttributes(typeof(CoTestAttribute), false);
    if(errorResult2.Length == 0)
    {
       Console.WriteLine("未得到需要的信息!");
    }

# endregion

Console.ReadLine();

}