由网友(好听又个性的抖音昵称 最吸引人的抖音昵称)分享简介：我拉着所有的先进功能，共同为这一个，但还没有与仿制药或lambda EX pressions非常多：I'm pulling all of the advanced features together for this one, but haven't worked with generics or lambda ex...

我拉着所有的先进功能，共同为这一个，但还没有与仿制药或lambda EX pressions非常多：

I'm pulling all of the advanced features together for this one, but haven't worked with generics or lambda expressions very much:

下面就是该方法的用法示例，我想创建：

Here's example usage of the method I want to create:

MyClass mc = null;
int x = mc.TryGetOrDefault(z => z.This.That.TheOther); // z is a reference to mc
// the code has not failed at this point and the value of x is 0 (int's default)
// had mc and all of the properties expressed in the lambda expression been initialized
// x would be equal to mc.This.That.TheOther's value

下面是据我已经得到了，但我不知道该怎么做这个EX pression对象。

Here's as far as I've gotten, but I'm not sure what to do with this expression object.

[的 1

推荐答案

这是诸如此类的事情，你是后？

Is this the sort of thing you're after?

public static TResult TryGetOrDefault<TSource, TResult>(this TSource obj, Func<TSource, TResult> expression)
{
    if (obj == null)
        return default(TResult);

    try
    {
        return expression(obj);
    }
    catch(NullReferenceException)
    {
        return default(TResult);
    }
}