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; }
   }
}

我还有另一堂课：

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想要初始化它。请告诉我如何执行此操作，我认为可以使用反射。但我没有这方面的知识。

Answer 1

如果你真的不需要课，你可以使用反射或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);
}

一个有趣的替代方案是使用＆＃34;静态＆＃34;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没有用，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);
    } 
}

Answer 2

您可以使用Reflection执行此操作，例如：

// create a Car object
Car cObj = new Car();

// get the type of car Object
var carType = typeof(cObj);

// get the propertyInfo object respective about the property you want to work
var property = carType.GetProperty("Break");

// set the value of the property in the object car
property.SetValue(cObj, "diskBreak");

如何设置名称为字符串形式的对象的属性？

2 个答案: