//获取httpurl URL url = new URL(hostUrl); HttpUrl httpUrl = HttpUrl.parse("https://" + url.getHost() + url.getPath()).newBuilder().// addQueryParameter("authorization", authorization).// addQueryParameter("date", date).// addQueryParameter("host", url.getHost()).// build(); return httpUrl.toString(); 这段代码转换为.net应该怎么写？

在C#中，可以使用`System.Web.HttpUtility`类的`UrlEncode`方法来对URL进行编码，使用`System.Uri`类来解析和构建URL。参考代码如下：

using System;
using System.Net;
using System.Web;

string hostUrl = "https://example.com/path?query=value";
string authorization = "your_authorization";
string date = DateTime.UtcNow.ToString("r");

Uri url = new Uri(hostUrl);
UriBuilder uriBuilder = new UriBuilder(url.Scheme, url.Host, url.Port, url.AbsolutePath);
uriBuilder.Query = url.Query;

string host = url.Host;
string path = url.AbsolutePath;

uriBuilder.Query += "&authorization=" + HttpUtility.UrlEncode(authorization);
uriBuilder.Query += "&date=" + HttpUtility.UrlEncode(date);
uriBuilder.Query += "&host=" + HttpUtility.UrlEncode(host);

string httpUrl = uriBuilder.ToString();

其中，`HttpUtility.UrlEncode`方法用于对参数进行URL编码，`UriBuilder`类用于构建URL，并添加查询参数。最终结果为一个字符串类型的URL。