Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.DynamicData/DynamicData/QueryStringHandler.cs

@@ -0,0 +1,75 @@
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Globalization;
+using System.Text;
+using System.Web.Resources;
+
+namespace System.Web.DynamicData {
+    internal static class QueryStringHandler {
+
+        public static string AddFiltersToPath(string virtualPath, IDictionary<string, object> filters) {
+            if (String.IsNullOrEmpty(virtualPath))
+                throw new ArgumentException(
+                    String.Format(CultureInfo.CurrentCulture, DynamicDataResources.QueryStringHandler_VirtualPathCannotBeEmpty),
+                    "virtualPath");
+
+            if (filters == null)
+                throw new ArgumentNullException("filters");
+
+            string queryString = ConcatenateQueryStringElements(filters);
+            if (String.IsNullOrEmpty(queryString))
+                return virtualPath;
+
+            StringBuilder result = new StringBuilder(virtualPath);
+            if (!virtualPath.Contains("?")) {
+                result.Append('?');
+            }
+            else {
+                if (!virtualPath.EndsWith("?", StringComparison.Ordinal) && !virtualPath.EndsWith("&", StringComparison.Ordinal)) {
+                    result.Append('&');
+                }
+            }
+
+            result.Append(queryString);
+
+            return result.ToString();
+        }
+
+        private static string ConcatenateQueryStringElements(IDictionary<string, object> parameters) {
+            if (parameters.Count == 0) {
+                return String.Empty;
+            }
+
+            StringBuilder result = new StringBuilder();
+            bool firstParam = true;
+            foreach (String s in parameters.Keys) {
+                if (!String.IsNullOrEmpty(s)) {
+                    string key = SanitizeParameterComponent(s);
+                    string value = SanitizeParameterComponent(parameters[s]);
+
+                    if (firstParam)
+                        firstParam = false;
+                    else
+                        result.Append('&');
+
+                    result.Append(key);
+                    result.Append('=');
+                    result.Append(value);
+                }
+            }
+            return result.ToString();
+        }
+
+        private static string SanitizeParameterComponent(object value) {
+            if (value == null)
+                return String.Empty;
+
+            string strValue = value.ToString();
+
+            // Trim trailing spaces, as they are typically meaningless, and make the url look ugly
+            strValue = strValue.TrimEnd();
+
+            return Uri.EscapeDataString(strValue);
+        }
+    }
+}