url: Implement url helper

Author: rollrat

CustomCrawler/CustomCrawler.csproj

@@ -92,6 +92,7 @@
     <Reference Include="System.Drawing" />
     <Reference Include="System.IO.Compression" />
     <Reference Include="System.IO.Compression.FileSystem" />
+    <Reference Include="System.Web" />
     <Reference Include="System.Xml" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Core" />
@@ -147,6 +148,7 @@
     <Compile Include="HtmlCAL.cs" />
     <Compile Include="HtmlTree.cs" />
     <Compile Include="SeleniumWrapper.cs" />
+    <Compile Include="URLHelper.cs" />
     <Compile Include="Utils.cs" />
     <Page Include="CustomCrawler.xaml">
       <Generator>MSBuild:Compile</Generator>

CustomCrawler/URLHelper.cs

@@ -0,0 +1,51 @@
+/***
+
+   Copyright (C) 2020. rollrat. All Rights Reserved.
+   
+   Author: Custom Crawler Developer
+
+***/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Web;
+
+namespace CustomCrawler
+{
+    public class URLHelper
+    {
+        Uri url;
+
+        public URLHelper(string url)
+        {
+            this.url = new Uri(url);
+        }
+
+        Dictionary<string, string> buffer;
+
+        public Dictionary<string, string> Parameters
+        {
+            get
+            {
+                if (buffer != null)
+                    return buffer;
+                var pp = HttpUtility.ParseQueryString(url.Query);
+                var result = new Dictionary<string, string>();
+                foreach (var key in pp.AllKeys)
+                    result.Add(key, pp[key]);
+                return buffer = result;
+            }
+        }
+
+        public List<string> DiffParams(URLHelper url)
+        {
+            var p1 = Parameters;
+            var p2 = url.Parameters;
+
+            return p1.Keys.Intersect(p2.Keys).Where(x => p1[x] != p2[x]).ToList();
+        }
+    }
+}