WebUtilities: Add more query helpers.

Author: Tratcher

src/Microsoft.AspNet.WebUtilities/FormHelpers.cs

@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
 using Microsoft.AspNet.Http;
 
 namespace Microsoft.AspNet.WebUtilities

src/Microsoft.AspNet.WebUtilities/QueryHelpers.cs

@@ -1,4 +1,9 @@
-using System;
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Text;
 
 namespace Microsoft.AspNet.WebUtilities
 {
@@ -16,5 +21,27 @@ public static string AddQueryString([NotNull] string uri, [NotNull] string name,
             bool hasQuery = uri.IndexOf('?') != -1;
             return uri + (hasQuery ? "&" : "?") + Uri.EscapeDataString(name) + "=" + Uri.EscapeDataString(value);
         }
+
+        /// <summary>
+        /// Append the given query keys and values to the uri.
+        /// </summary>
+        /// <param name="uri">The base uri.</param>
+        /// <param name="queryString">A collection of name value query pairs to append.</param>
+        /// <returns>The combine result.</returns>
+        public static string AddQueryString([NotNull] string uri, [NotNull] IDictionary<string, string> queryString)
+        {
+            var sb = new StringBuilder();
+            sb.Append(uri);
+            bool hasQuery = uri.IndexOf('?') != -1;
+            foreach (var parameter in queryString)
+            {
+                sb.Append(hasQuery ? '&' : '?');
+                sb.Append(Uri.EscapeDataString(parameter.Key));
+                sb.Append('=');
+                sb.Append(Uri.EscapeDataString(parameter.Value));
+                hasQuery = true;
+            }
+            return sb.ToString();
+        }
     }
 }