c#如何获取网页里所有的链接完整url地址？

using System;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

namespace HelloWorldApplication
{
    class HelloWorld
    {
        static void Main(string[] args) {
            System.Net.WebClient client = new WebClient();
            byte[] page = client.DownloadData("http://www.bfw.wiki");
...

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这样也可以

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
namespace HelloWorldApplication
{
    class HelloWorld
    {

        public static string GetHtml(string url) {
            string res = "";
            WebClient client = new WebClient();
            Stream stream = client.OpenRead(url);
            StreamReader sr = new StreamReader(stream, Encoding.Default);
       ...

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