Question

我需要创建一个通用的set accesor，我可以传递classname.classname.property和要设置的值。我看到了这个问题并得到了回答，但我无法在我的项目中实施它。

链接是Is it possible to pass in a property name as a string and assign a value to it?

在下面的示例代码中，SetValue如何设置长度和宽度的值？

public interface MPropertySettable { }
public static class PropertySettable {
  public static void SetValue<T>(this MPropertySettable self, string name, T value) {
    self.GetType().GetProperty(name).SetValue(self, value, null);
  }
}
public class Foo : MPropertySettable {
  public Taste Bar { get; set; }
  public int Baz { get; set; }
}

public class Taste : BarSize {
    public bool sweet {get; set;}
    public bool sour {get; set;}
}

public class BarSize {
    public int length { get; set;}
    public int width { get; set;}
}

class Program {
  static void Main() {
    var foo = new Foo();
    foo.SetValue("Bar", "And the answer is");
    foo.SetValue("Baz", 42);
    Console.WriteLine("{0} {1}", foo.Bar, foo.Baz);
  }
}

Answer 1

您正在尝试将字符串值设置为Taste对象。使用Taste的新实例

可以正常工作

class Program {
   static void Main() {
       var foo = new Foo();
       foo.SetValue("Bar", new Taste());
       foo.SetValue("Baz", 42);
       Console.WriteLine("{0} {1}", foo.Bar, foo.Baz);
   }
}

如果BarSize派生自MPropertySettable，它将起作用。

public interface MPropertySettable { }
public static class PropertySettable
{
    public static void SetValue<T>(this MPropertySettable self, string name, T value) {
        self.GetType().GetProperty(name).SetValue(self, value, null);
    }
}
public class Foo : MPropertySettable
{
    public Taste Bar { get; set; }
    public int Baz { get; set; }
}

public class Taste : BarSize
{
    public bool sweet { get; set; }
    public bool sour { get; set; }
}

public class BarSize : MPropertySettable
{
    public int length { get; set; }
    public int width { get; set; }
}

class Program
{
    static void Main() {
        var barSize = new BarSize();
        barSize.SetValue("length", 100);
        barSize.SetValue("width", 42);
        Console.WriteLine("{0} {1}", barSize.length, barSize.width);
    }
}

SetValue来自继承类的特性

1 个答案: