HtmlElementCollection的First（）

Question

我写了一个方法扩展来模拟List＆＃39; First()但是如果我尝试更改属性，返回的值（实际引用，isn＆＃39; t？）不起作用例如，它;

HtmlElement ele = webBrowser1.Document.All.GetElementsByName("foo").First();
ele.InnerText = "hello!"; // doesn't Works. That value isn't changed. Why?
webBrowser1.Document.All.GetElementsByName("foo")[0].InnerText = "abc"; // but this does Works

此处First()功能：

   public static HtmlElement First(this HtmlElementCollection a)
        {
            if (a == null)
                throw new ArgumentNullException();
            if (a.Count == 0)
                throw new InvalidOperationException();

            return a[0];
        }

为什么使用a.First().value = foo的回复并不起作用，arr[0].value = "hehe";呢？我如何解决它？我是否需要了解如何使用退货ref？

Answer 1

基于这篇文章：LINQ: Select an object and change some properties without creating a new object

var ele = webBrowser1.Document.All.GetElementsByName("foo")
                              .First().Select(e => { e.InnerText = "hello"; return e; });