/mcs/class/Managed.Windows.Forms/System.Windows.Forms/ListBindingHelper.cs
C# | 189 lines | 126 code | 32 blank | 31 comment | 59 complexity | 969ce9bde603856c952856e4cd543264 MD5 | raw file
Possible License(s): Unlicense, Apache-2.0, LGPL-2.0, MPL-2.0-no-copyleft-exception, CC-BY-SA-3.0, GPL-2.0
- // Permission is hereby granted, free of charge, to any person obtaining
- // a copy of this software and associated documentation files (the
- // "Software"), to deal in the Software without restriction, including
- // without limitation the rights to use, copy, modify, merge, publish,
- // distribute, sublicense, and/or sell copies of the Software, and to
- // permit persons to whom the Software is furnished to do so, subject to
- // the following conditions:
- //
- // The above copyright notice and this permission notice shall be
- // included in all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- //
- // Copyright (c) 2007 Novell, Inc.
- //
- // Author:
- // Carlos Alberto Cortez <calberto.cortez@gmail.com>
- // Ivan Zlatev <contact@i-nz.net>
- //
- using System;
- using System.Collections;
- using System.ComponentModel;
- using System.Reflection;
- using System.Collections.Generic;
- namespace System.Windows.Forms
- {
- public static class ListBindingHelper
- {
- public static object GetList (object list)
- {
- if (list is IListSource)
- return ((IListSource) list).GetList ();
- return list;
- }
- public static object GetList (object dataSource, string dataMember)
- {
- dataSource = GetList (dataSource);
- if (dataSource == null || dataMember == null || dataMember.Length == 0)
- return dataSource;
- PropertyDescriptor property = GetListItemProperties (dataSource).Find (dataMember, true);
- if (property == null)
- throw new ArgumentException ("dataMember");
- object item = null;
- ICurrencyManagerProvider currencyManagerProvider = dataSource as ICurrencyManagerProvider;
- if (currencyManagerProvider != null && currencyManagerProvider.CurrencyManager != null) {
- CurrencyManager currencyManager = currencyManagerProvider.CurrencyManager;
- if (currencyManager != null && currencyManager.Count > 0 && currencyManager.Current != null)
- item = currencyManager.Current;
- }
- if (item == null) {
- if (dataSource is IEnumerable) {
- if (dataSource is IList) {
- IList list = (IList) dataSource;
- item = list.Count > 0 ? list[0] : null;
- } else {
- IEnumerator e = ((IEnumerable) dataSource).GetEnumerator ();
- if (e != null && e.MoveNext ())
- item = e.Current;
- }
- } else {
- item = dataSource;
- }
- }
- if (item != null)
- return property.GetValue (item);
- return null;
- }
- public static Type GetListItemType (object list)
- {
- return GetListItemType (list, String.Empty);
- }
- public static Type GetListItemType (object dataSource, string dataMember)
- {
- if (dataSource == null)
- return null;
- if (dataMember != null && dataMember.Length > 0) {
- PropertyDescriptor property = GetProperty (dataSource, dataMember);
- if (property == null)
- return typeof (object);
- return property.PropertyType;
- }
- if (dataSource is Array)
- return dataSource.GetType ().GetElementType ();
- // IEnumerable seems to have higher precedence over IList
- if (dataSource is IEnumerable) {
- IEnumerator enumerator = ((IEnumerable) dataSource).GetEnumerator ();
- if (enumerator.MoveNext () && enumerator.Current != null)
- return enumerator.Current.GetType ();
- if (dataSource is IList || dataSource.GetType () == typeof (IList<>)) {
- PropertyInfo property = GetPropertyByReflection (dataSource.GetType (), "Item");
- if (property != null) // `Item' could be interface-explicit, and thus private
- return property.PropertyType;
- }
- // fallback to object
- return typeof (object);
- }
- return dataSource.GetType ();
- }
- public static PropertyDescriptorCollection GetListItemProperties (object list)
- {
- return GetListItemProperties (list, null);
- }
- public static PropertyDescriptorCollection GetListItemProperties (object list, PropertyDescriptor [] listAccessors)
- {
- list = GetList (list);
- if (list == null)
- return new PropertyDescriptorCollection (null);
- if (list is ITypedList)
- return ((ITypedList)list).GetItemProperties (listAccessors);
- if (listAccessors == null || listAccessors.Length == 0) {
- Type item_type = GetListItemType (list);
- return TypeDescriptor.GetProperties (item_type,
- new Attribute [] { new BrowsableAttribute (true) });
- }
- // Take into account only the first property
- Type property_type = listAccessors [0].PropertyType;
- if (typeof (IList).IsAssignableFrom (property_type) || typeof (IList<>).IsAssignableFrom (property_type)) {
- PropertyInfo property = GetPropertyByReflection (property_type, "Item");
- return TypeDescriptor.GetProperties (property.PropertyType);
- }
- return new PropertyDescriptorCollection (new PropertyDescriptor [0]);
- }
- public static PropertyDescriptorCollection GetListItemProperties (object dataSource, string dataMember,
- PropertyDescriptor [] listAccessors)
- {
- throw new NotImplementedException ();
- }
- public static string GetListName (object list, PropertyDescriptor [] listAccessors)
- {
- if (list == null)
- return String.Empty;
- Type item_type = GetListItemType (list);
- return item_type.Name;
- }
- static PropertyDescriptor GetProperty (object obj, string property_name)
- {
- return TypeDescriptor.GetProperties (obj,
- new Attribute [] { new BrowsableAttribute (true) })[property_name];
- }
- //
- // Need to use reflection as we need to bypass the TypeDescriptor.GetProperties () limitations
- //
- static PropertyInfo GetPropertyByReflection (Type type, string property_name)
- {
- foreach (PropertyInfo prop in type.GetProperties (BindingFlags.Public | BindingFlags.Instance))
- if (prop.Name == property_name)
- return prop;
- return null;
- }
- }
- }