Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,42 @@
+using System.Collections.Generic;
+using System.Globalization;
+using System.Web.DynamicData.Util;
+using System.Web.Resources;
+using System.Web.UI;
+using System.Web.UI.WebControls;
+
+namespace System.Web.DynamicData {
+
+    /// <summary>
+    /// DynamicQueryStringParameter allows a datasource to have its primary key easily fed from the query string.
+    /// It does not require any attributes, and works even for multi-part primary keys.
+    /// </summary>
+    public class DynamicQueryStringParameter : Parameter, IWhereParametersProvider {
+        /// <summary>
+        /// See IWhereParametersProvider.GetWhereParameters
+        /// </summary>
+        public virtual IEnumerable<Parameter> GetWhereParameters(IDynamicDataSource dataSource) {
+            var table = MetaTableHelper.GetTableWithFullFallback(dataSource, HttpContext.Current.ToWrapper());
+            
+            // check makes no sense as the above call will throw
+            //if (table == null) {
+            //    return new Parameter[0];
+            //}
+
+            return RouteParametersHelper.GetColumnParameters(table, Name);
+        }
+
+        /// <summary>
+        /// same as base
+        /// </summary>
+        /// <param name="context"></param>
+        /// <param name="control"></param>
+        /// <returns></returns>
+        protected override object Evaluate(HttpContext context, Control control) {
+            // If this gets called, it means we never had a chance to expand the parameter. Give an error
+            // telling the user to use a DynamicDataManager
+            throw new InvalidOperationException(String.Format(
+                CultureInfo.CurrentCulture, DynamicDataResources.DynamicParameter_NeedExpansion, typeof(DynamicQueryStringParameter).Name));
+        }
+    }
+}