什么是最好或最有趣的使用扩展方法，你见过？ [英] What is the best or most interesting use of Extension Methods you've seen?

问题描述

我开始真的爱扩展方法...我想知道是否有人有她一个真正自爆自己的心意，或者只是在偶然发现聪明。

I'm starting to really love extension methods... I was wondering if anyone her has stumbled upon one that really blew their mind, or just found clever.

今天我写了一个例子：

由于其他用户的评论编辑：

public static IEnumerable<int> To(this int fromNumber, int toNumber) {
    while (fromNumber < toNumber) {
        yield return fromNumber;
        fromNumber++;
    }
}

这使得for循环可以写成一个foreach循环：

This allows a for loop to be written as a foreach loop:

foreach (int x in 0.To(16)) {
    Console.WriteLine(Math.Pow(2, x).ToString());
}

我等不及看其他的例子！尽情享受吧！

I can't wait to see other examples! Enjoy!

推荐答案

这是一个已经得到一些游戏从我最近：

This is one that's been getting some play from me lately:

public static IDisposable Tag(this HtmlHelper html, string tagName)
{
    if (html == null)
        throw new ArgumentNullException("html");

    Action<string> a = tag => html.Write(String.Format(tag, tagName));
    a("<{0}>");
    return new Memento(() => a("</{0}>"));
}

用于这样的：

using (Html.Tag("ul"))
{
    this.Model.ForEach(item => using(Html.Tag("li")) Html.Write(item));
    using(Html.Tag("li")) Html.Write("new");
}

备忘录是一个方便的类：

Memento is a handy class:

public sealed class Memento : IDisposable
{
    private bool Disposed { get; set; }
    private Action Action { get; set; }

    public Memento(Action action)
    {
        if (action == null)
            throw new ArgumentNullException("action");

        Action = action;
    }

    void IDisposable.Dispose()
    {
        if (Disposed)
            throw new ObjectDisposedException("Memento");

        Disposed = true;
        Action();
    }
}

和完成的依赖关系：

public static void Write(this HtmlHelper html, string content)
{
    if (html == null)
        throw new ArgumentNullException("html");

    html.ViewContext.HttpContext.Response.Write(content);
}

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