Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.DynamicData/DynamicData/Util/RouteParametersHelper.cs

@@ -0,0 +1,71 @@
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Web.UI.WebControls;
+
+namespace System.Web.DynamicData.Util {
+    internal class RouteParametersHelper {
+        private static Parameter CreateParameter(string name, string value, MetaColumn configurationColumn) {
+            var param = new Parameter() {
+                Name = name,
+                DefaultValue = value
+            };
+            DataSourceUtil.SetParameterTypeCodeAndDbType(param, configurationColumn);
+            return param;
+        }
+
+        internal static IEnumerable<Parameter> GetColumnParameters(MetaTable table, string columnName) {
+            if (String.IsNullOrEmpty(columnName)) {
+                // If no column is specified, we're setting the primary key from the query string
+                return GetPrimaryKeyParameters(table);
+            } else {
+                var column = table.GetColumn(columnName);
+                var fkColumn = column as MetaForeignKeyColumn;
+                if (fkColumn != null) {
+                    // Handle the case where we're setting one of our foreign keys from the query string
+                    return GetForeignKeyParameters(fkColumn);
+                } else {
+                    // Handle other columns (e.g. booleans)
+                    return GetRegularColumnParameters(column);
+                }
+            }
+        }
+
+        internal static IEnumerable<Parameter> GetForeignKeyParameters(MetaForeignKeyColumn fkColumn) {
+            Debug.Assert(fkColumn.ForeignKeyNames.Count == fkColumn.ParentTable.PrimaryKeyColumns.Count);
+            var result = new List<Parameter>();
+            for (int i = 0; i < fkColumn.ForeignKeyNames.Count; i++) {
+                string name = fkColumn.ForeignKeyNames[i];
+                string value = Misc.GetRouteValue(name);
+
+                MetaColumn parentTablePKColumn = fkColumn.ParentTable.PrimaryKeyColumns[i];
+
+                var param = CreateParameter(name, value, parentTablePKColumn);
+            
+                result.Add(param);
+            }
+            return result;
+        }
+
+        internal static IEnumerable<Parameter> GetPrimaryKeyParameters(MetaTable table) {
+            var result = new List<Parameter>();
+            foreach (var primaryKeyColumn in table.PrimaryKeyColumns) {
+                string name = primaryKeyColumn.Name;
+                string value = Misc.GetRouteValue(name);
+
+                var param = CreateParameter(name, value, primaryKeyColumn);
+                result.Add(param);
+            }
+            return result;
+        }
+
+        internal static IEnumerable<Parameter> GetRegularColumnParameters(MetaColumn column) {
+            // Handle other columns (e.g. booleans)
+            string name = column.Name;
+            string value = Misc.GetRouteValue(name);
+
+            var param = CreateParameter(name, value, column);
+            
+            return new List<Parameter>() { param };
+        }
+    }
+}