Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,54 @@
+namespace System.Web.DynamicData.Util {
+    using System;            
+    using System.Web.UI;
+    using System.Web.UI.WebControls;
+    using System.Web.Resources;
+    using System.Globalization;
+    using IDataBoundControlInterface = System.Web.UI.WebControls.IDataBoundControl;
+
+    internal static class DataControlHelper {
+        internal static IDynamicDataSource FindDataSourceControl(Control current) {
+            for (; ; current = current.NamingContainer) {
+                // Don't look further than the Page, or if the control is not added to a page hierarchy
+                if (current == null || current is Page)
+                    return null;
+
+                IDataBoundControlInterface dataBoundControl = GetDataBoundControl(current, false /*failIfNotFound*/);
+
+                // Not a data control: continue searching
+                if (dataBoundControl == null) {
+                    continue;
+                }
+                // Return its DynamicDataSource
+                return dataBoundControl.DataSourceObject as IDynamicDataSource;
+            }
+        }
+
+        internal static IDataBoundControlInterface GetDataBoundControl(Control control, bool failIfNotFound) {
+            if (control is IDataBoundControlInterface) {
+                return (IDataBoundControlInterface)control;
+            }
+            IDataBoundControlInterface dataBoundControl = null;
+            if (control is Repeater) {
+                dataBoundControl = GetControlAdapter(control);
+            }            
+
+            if (dataBoundControl == null && failIfNotFound) {
+                throw new Exception(String.Format(
+                    CultureInfo.CurrentCulture,
+                    DynamicDataResources.DynamicDataManager_UnsupportedControl,
+                    control.GetType()));
+            }
+
+            return dataBoundControl;
+        }
+
+        internal static IDataBoundControlInterface GetControlAdapter(Control control) {
+            Repeater repeater = control as Repeater;
+            if (repeater != null) {
+                return new RepeaterDataBoundAdapter(repeater);
+            }
+            return null;
+        }
+    }
+}