如何使用字符串作为属性名称从嵌套对象组中找到对象属性值? [英] How to find an object property value from a nested objected group using a string as the property name?

问题描述

我有一组嵌套的对象，即某些属性是自定义对象.我想使用字符串作为属性名称来获取层次结构组中的对象属性值，并使用某种形式的查找"方法来扫描层次结构以查找具有匹配名称的属性，并获取其值.

I have a nested set of objects ie some properties are custom objects. I would like to get a object property value within the hierarchy group using a string for the property name, and some form of "find" method to scan the hierarchy to find a property with matching name, and get its value.

这有可能吗?

非常感谢.

编辑

类定义可能是伪代码:

Class Car
    Public Window myWindow()
    Public Door myDoor()
Class Window
    Public Shape()
Class Door
    Public Material()

Car myCar = new Car()
myCar.myWindow.Shape ="Round"
myDoor.Material = "Metal"

有点作弊，但是我可以通过某种形式的find函数，使用魔术字符串"Shape"，从顶部对象开始，找到""Shape"属性的值. 即:

All a little contrived, but could I "find" the value of the "Shape" property by using the magic string "Shape" in some form of find function, starting from the top object. ie:

string myResult = myCar.FindPropertyValue("Shape")

希望myResult ="Round".

Hopefully myResult = "Round".

这就是我的追求.

谢谢.

推荐答案

基于您在问题中显示的类，您将需要递归调用来迭代对象属性.可以重复使用的东西怎么样:

Based on classes you showed in your question, you would need a recursive call to iterate your object properties. How about something you can reuse:

object GetValueFromClassProperty(string propname, object instance)
{
    var type = instance.GetType();
    foreach (var property in type.GetProperties())
    {
        var value = property.GetValue(instance, null);
        if (property.PropertyType.FullName != "System.String"
            && !property.PropertyType.IsPrimitive)
        {
            return GetValueFromClassProperty(propname, value);
        }
        else if (property.Name == propname)
        {
            return value;
        }
    }

    // if you reach this point then the property does not exists
    return null;
}

propname是您要搜索的属性.您可以这样使用:

propname is the property you are searching for. You can use is like this:

var val = GetValueFromClassProperty("Shape", myCar );

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