如何从MemberExpression获取属性值

Question

我试图通过MemberExpression获取属性值。

例如，给定以下对象，我想在“ Id”属性中获取Guid值。

public class Employee
{
    public Guid Id {get; set}
}

我有一个事件被调用，其中有一个MemberExpression传递给该事件。 MemberExpression参数表示Employee.Id属性。 我怎样才能获得“ID”从MemberExpression 价值 ？ 我尝试使用的代码如下：

(MemberExpression employeeIdMember is parameter to the event)
if ((employeeIdMember.Member as PropertyInfo) != null)
{
    PropertyInfo employeeIdProperty = employeeIdMember.Member as PropertyInfo;
    // at this point employeeIdProperty represents {System.Guid Id}

    PropertyInfo parentObject = (MemberExpression)employeeIdMember.Expression).Member as PropertyInfo;
    // at this point, parentObject represents {BusinessObjects.Employee Employee}

    // HOW to call employeeIdProperty.GetValue(parentObject) to get the Id Property Value?? I've tried this call here, but it does not work
}

Answer 1

此时，您具有2个属性，使您可以进行两次间接定向。

它错过了一个切入点：对“ BusinessObjects”的引用

然后打电话

var businessObjects = ???
var id = employeeIdProperty.GetValue(parentObject.GetValue(businessObjects));