Question

我有以下代码。

类：

public class AlloyDock
{
    public int Left { get; set; }
    public int Right { get; set; }
}

public class Charger
{
    public int Left { get; set; }
    public int Right { get; set; }
}
public class VehicleControlTest
{
    public Charger Charger1 { get; set; }
}
public class BasicControlTest
{
    public AlloyDock AlloyDock1 { get; set; }
}
class Appointment
{
    public BasicControlTest BasicControlTest1 { get; set; }
    public VehicleControlTest VehicleControlTest1 { get; set; }
}

主要功能：

        var obj = new Appointment();
        obj.BasicControlTest1 = new BasicControlTest();
        obj.BasicControlTest1.AlloyDock1 = new AlloyDock();
        obj.BasicControlTest1.AlloyDock1.Left = 1;
        obj.BasicControlTest1.AlloyDock1.Right = 2;

        obj.VehicleControlTest1 = new VehicleControlTest();
        obj.VehicleControlTest1.Charger1 = new Charger();
        obj.VehicleControlTest1.Charger1.Left = 3;
        obj.VehicleControlTest1.Charger1.Right = 4;


        var parentProperties = obj.GetType().GetProperties();
        foreach (var prop in parentProperties)
        {
            // Get Main objects inside each test type.
            var mainObjectsProperties = prop.PropertyType.GetProperties();
            foreach (var property in mainObjectsProperties)
            {
                var leafProperties = property.PropertyType.GetProperties();
                foreach (var leafProperty in leafProperties)
                {
                    Console.WriteLine("{0}={1}", leafProperty.Name, leafProperty.GetValue(obj, null));
                }
            }
        }

我想获取叶节点的属性名称和值。我能够得到名字，但是当我试图获得价值时（分别为1,2,3,4）。我收到了以下错误。

对象与目标类型不匹配。

我只是在试图解决这个问题。任何人都可以帮助我。

Answer 1

将对象实例传递给GetValue方法时，需要传递正确类型的实例：

// 1st level properties
var parentProperties = obj.GetType().GetProperties();
foreach (var prop in parentProperties)
{
    // get the actual instance of this property
    var propertyInstance = prop.GetValue(obj, null);

    // get 2nd level properties
    var mainObjectsProperties = prop.PropertyType.GetProperties();

    foreach (var property in mainObjectsProperties)
    {
        // get the actual instance of this 2nd level property
        var leafInstance = property.GetValue(propertyInstance, null);

        // 3rd level props
        var leafProperties = property.PropertyType.GetProperties();

        foreach (var leafProperty in leafProperties)
        {
            Console.WriteLine("{0}={1}",
                leafProperty.Name, leafProperty.GetValue(leafInstance, null));
        }
    }
}

您可以递归地执行此操作以简化（概括）整个事情：

static void DumpObjectTree(object propValue, int level = 0)
{
    if (propValue == null)
        return;

    var childProps = propValue.GetType().GetProperties();
    foreach (var prop in childProps)
    {
        var name = prop.Name;
        var value = prop.GetValue(propValue, null);

        // add some left padding to make it look like a tree
        Console.WriteLine("".PadLeft(level * 4, ' ') + "{0}={1}", name, value);

        // call again for the child property
        DumpObjectTree(value, level + 1);
    }
}

// usage: DumpObjectTree(obj);

Answer 2

问题在于这个表达式：

leafProperty.GetValue(obj, null)

您正在传递根对象以获取leaf属性。在处理每个属性时，您需要获取其值，然后针对它调用GetValue。

通过反射C＃获取嵌套属性值

2 个答案: