如何设置名称为字符串形式的对象的属性？

Question

IDE:Visual Studio 2010,C#,.NET 4.0,Winforms应用程序.在我开始之前看到这个课程:

public class Car
{
   private string _break;         

   public string Break
   {
      get { return _break; }
      set { _break = value; }
   }
}

我有另一堂课:

public class Runner
{
   Car cObj = new Car();

   string propertyName = "Break";
   //cobj.Break = "diskBreak"; I can do this but I have property name in string format  

   cobj[propertyName] = "diskBreak"; // I have the property name in string format
   // and I want to make it's Property format please suggest how to to this?
}

我有字符串格式的属性名称,我想在属性中转换它,并希望初始化它.请告诉我如何执行此操作,我认为可以使用反射.但我没有那种知识.

Answer 1

如果你真的不需要类,可以使用反射或ExpandoObject.

// 1. Reflection
public void SetByReflection(){
    Car cObj = new Car();
    string propName = "Break";
    cObj.GetType().GetProperty(propName).SetValue(cObj, "diskBreak");
    Console.WriteLine (cObj.Break);
}

// 2. ExpandoObject
public void UseExpandoObject(){
    dynamic car = new ExpandoObject();
    string propName = "Break";
    ((IDictionary<string, object>)car)[propName] = "diskBreak";
    Console.WriteLine (car.Break);
}

一个总是有趣的替代方案是使用"静态"反射,如果你可以使用表达式而不是字符串 - 在你的情况下很可能不必要,但我想我可能会对比不同的方法.

// 3. "Static" Reflection
public void UseStaticReflection(){
    Car car = new Car();
    car.SetProperty(c => c.Break, "diskBreak");
    Console.WriteLine (car.Break);
}

public static class PropExtensions{
    public static void SetProperty<T, TProp>(this T obj, Expression<Func<T, TProp>> propGetter, TProp value){       
        var propName = ((MemberExpression)propGetter.Body).Member.Name;
        obj.GetType().GetProperty(propName).SetValue(obj, value);
    } 
}