使用反射获取嵌套对象属性值 [英] Getting Nested Object Property Value Using Reflection

问题描述

我有以下两个类:

public class Address
{
    public string AddressLine1 { get; set; }
    public string AddressLine2 { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Zip { get; set; }
}

public class Employee
{
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string LastName { get; set; }
    public Address EmployeeAddress { get; set; }
}

我有一个员工类的实例，如下所示:

I have an instance of the employee class as follows:

    var emp1Address = new Address();
    emp1Address.AddressLine1 = "Microsoft Corporation";
    emp1Address.AddressLine2 = "One Microsoft Way";
    emp1Address.City = "Redmond";
    emp1Address.State = "WA";
    emp1Address.Zip = "98052-6399";

    var emp1 = new Employee();
    emp1.FirstName = "Bill";
    emp1.LastName = "Gates";
    emp1.EmployeeAddress = emp1Address;

我有一个方法可以根据属性名称获取属性值，如下所示:

I have a method which gets the property value based on the property name as follows:

public object GetPropertyValue(object obj ,string propertyName)
{
    var objType = obj.GetType();
    var prop = objType.GetProperty(propertyName);

    return prop.GetValue(obj, null);
}

上述方法适用于 GetPropertyValue(emp1, "FirstName") 之类的调用，但如果我尝试 GetPropertyValue(emp1, "Address.AddressLine1")，它会抛出一个异常，因为 objType.GetProperty(propertyName); 无法定位嵌套对象的属性值.有没有办法解决这个问题?

The above method works fine for calls like GetPropertyValue(emp1, "FirstName") but if I try GetPropertyValue(emp1, "Address.AddressLine1") it throws an exception because objType.GetProperty(propertyName); is not able to locate the nested object property value. Is there a way to fix this?

推荐答案

var address = GetPropertyValue(GetPropertyValue(emp1, "Address"), "AddressLine1");

对象员工没有一个名为Address.AddressLine1"的属性，它有一个名为Address"的属性，它本身有一个名为AddressLine1"的属性.

Object Employee doesn't have a single property named "Address.AddressLine1", it has a property named "Address", which itself has a property named "AddressLine1".

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