通过索引访问属性

发布于 2024-12-10 15:45:06 字数 484 浏览 0 评论 0原文

我需要通过索引或类似的东西访问属性。这个已经回答的问题中解释了原因。该答案使用 Linq，我更喜欢没有这种依赖性的东西。我无法控制班级。

public class myClass
{
    private string s = "some string";
    public string S
    {
        get { return s; }
    }
}

class Program
{
    static void Main(string[] args)
    {
        myClass c = new myClass();
        // I would like something similar
        // or same functionality
        string s = c["S"];
    }
}

原文

I need to access a property by an index or something similar. The reason why is explained in this already answered question. That answer uses Linq and I prefer something without that dependency. I have no control over the class.

public class myClass
{
    private string s = "some string";
    public string S
    {
        get { return s; }
    }
}

class Program
{
    static void Main(string[] args)
    {
        myClass c = new myClass();
        // I would like something similar
        // or same functionality
        string s = c["S"];
    }
}

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壹場煙雨 2024-12-17 15:45:06

由于您无法控制该类，因此您可以使用扩展方法和反射来按名称获取属性值：

static class ObjectExtensions
{
    public static TResult Get<TResult>(this object @this, string propertyName)
    {
        return (TResult)@this.GetType().GetProperty(propertyName).GetValue(@this, null);
    }
}

用法：

class A
{
    public string Z
    {
        get;
        set;
    }

    public int X
    {
        get;
        set;
    }
}

class Program
{
    static void Main(string[] args)
    {
        A obj = new A();
        obj.Z = "aaa";
        obj.X = 15;

        Console.WriteLine(obj.Get<string>("Z"));
        Console.WriteLine(obj.Get<int>("X"));
        Console.ReadLine();

    }
}

As you have no control over the class you can use extension method and reflection to get property value by name:

static class ObjectExtensions
{
    public static TResult Get<TResult>(this object @this, string propertyName)
    {
        return (TResult)@this.GetType().GetProperty(propertyName).GetValue(@this, null);
    }
}

Usage:

class A
{
    public string Z
    {
        get;
        set;
    }

    public int X
    {
        get;
        set;
    }
}

class Program
{
    static void Main(string[] args)
    {
        A obj = new A();
        obj.Z = "aaa";
        obj.X = 15;

        Console.WriteLine(obj.Get<string>("Z"));
        Console.WriteLine(obj.Get<int>("X"));
        Console.ReadLine();

    }
}

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三寸金莲 2024-12-17 15:45:06

use （编辑 - 根据评论）：

string s = c.GetType().GetProperty ("S").GetGetMethod().Invoke (c, null).ToString();

它为您提供实例 c 名为 S 的（公共）属性的值，无论 c 的类型如何 并且根本不使用 LINQ，尽管我必须承认我不明白为什么 LINQ 会成为一个问题......

use (EDIT - as per comment):

string s = c.GetType().GetProperty ("S").GetGetMethod().Invoke (c, null).ToString();

It gives you the value of the (public) property named S of the the instance c regardless of the type of c and doesn't use LINQ at all although I must admit that I don't see why LINQ should be a problem...

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