一个有用的UrlBuilder类

代码

using System;
using System.Web;
using System.Collections.Specialized;

namespace CraigLabs.Common {
    public class UrlBuilder : UriBuilder {
        StringDictionary _queryString = null;

        #region Properties
        public StringDictionary QueryString {
            get {
                if(_queryString == null) {
                    _queryString = new StringDictionary();
                }

                return _queryString;
            }
        }

        public string PageName {
            get {
                string path = base.Path;
                return path.Substring(path.LastIndexOf("/") + 1);
            }
            set {
                string path = base.Path;
                path = path.Substring(0, path.LastIndexOf("/"));
                base.Path = string.Concat(path, "/", value);
            }
        }
        #endregion

        #region Constructor overloads
        public UrlBuilder() : base() {
        }

        public UrlBuilder(string uri) : base(uri) {
            PopulateQueryString();
        }

        public UrlBuilder(Uri uri) : base(uri) {
            PopulateQueryString();
        }

        public UrlBuilder(string schemeName, string hostName) : base(schemeName, hostName) {
        }

        public UrlBuilder(string scheme, string host, int portNumber) : base(scheme, host, portNumber) {
        }

        public UrlBuilder(string scheme, string host, int port, string pathValue) : base(scheme, host, port, pathValue) {
        }

        public UrlBuilder(string scheme, string host, int port, string path, string extraValue) : base(scheme, host, port, path, extraValue) {
        }

        public UrlBuilder(System.Web.UI.Page page) : base(page.Request.Url.AbsoluteUri) {
            PopulateQueryString();
        }
        #endregion

        #region Public methods
        public new string ToString() {
            GetQueryString();

            return base.Uri.AbsoluteUri;
        }

        public void Navigate() {
            _Navigate(true);
        }

        public void Navigate(bool endResponse) {
            _Navigate(endResponse);
        }

        private void _Navigate(bool endResponse) {
            string uri = this.ToString();
            HttpContext.Current.Response.Redirect(uri, endResponse);
        }
        #endregion

        #region Private methods
        private void PopulateQueryString() {
            string query = base.Query;

            if(query == string.Empty || query == null) {
                return;
            }

            if(_queryString == null) {
                _queryString = new StringDictionary();
            }

            _queryString.Clear();

            query = query.Substring(1); //remove the ?

            string[] pairs = query.Split(new char[]{'&'});
            foreach(string s in pairs) {
                string[] pair = s.Split(new char[]{'='});

                _queryString[pair[0]] = (pair.Length > 1) ? pair[1] : string.Empty;
            }
        }

        private void GetQueryString() {
            int count = _queryString.Count;

            if(count == 0) {
                base.Query = string.Empty;
                return;
            }

            string[] keys = new string[count];
            string[] values = new string[count];
            string[] pairs = new string[count];

            _queryString.Keys.CopyTo(keys, 0);
            _queryString.Values.CopyTo(values, 0);

            for(int i = 0; i < count; i++) {
                pairs[i] = string.Concat(keys[i], "=", values[i]);
            }

            base.Query = string.Join("&", pairs);
        }
        #endregion
    }
}

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