c# - 对从 Linq 查询访问私有(private)变量感到困惑

Question

我有点困惑为什么我可以从 linq 查询访问私有(private)变量？

访问是在 PropertyName 方法中访问 _propertyName 变量。我想因为它是私有(private)的，所以我无法访问它？

public class ObjectGraph
{
    private readonly string _propertyName;

    public string PropertyName
    {
        get
        {
            // ermmm, not sure why this Select can access _propertyName???
            var parents = string.Join("/", Parents.Select(p => p._propertyName));
            return string.Format("{0}/{1}", parents, _propertyName);
        }
    }

    public ObjectReplicationContext Source { get; private set; }

    public int ClosestParentId { get; set; }

    public bool TraverseChildren { get; set; }

    public List<ObjectGraph> Parents { get; set; }

    public ObjectGraph(object source, string propertyName)
    {
        Source = new ObjectReplicationContext(source);
        _propertyName = propertyName;

        Parents = new List<ObjectGraph>();
        TraverseChildren = true;
    }
}

Answer 1

一个类总是可以访问它自己的私有(private)成员。 lambda 只是类中存在的匿名回调方法；它是由 C# 编译器提供的语法糖。

想象一下你有这个

private static string GetProperyName(ObjectGraph obj) {
  return obj._propertyName;
}

public string PropertyName
{
   get
   {
        // ermmm, not sure why this Select can access _propertyName???
        var parents = string.Join("/", Parents.Select(GetProperyName));
        return string.Format("{0}/{1}", parents, _propertyName);
    }
}

这等同于您的代码。