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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Linq;
using System.Web.UI;
namespace System.Web.Mvc
{
[SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Multi", Justification = "FxCop won't accept this in the custom dictionary, so we're suppressing it in source")]
[SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix", Justification = "This is a shipped API")]
public class MultiSelectList : IEnumerable<SelectListItem>
{
public MultiSelectList(IEnumerable items)
: this(items, null /* selectedValues */)
{
}
public MultiSelectList(IEnumerable items, IEnumerable selectedValues)
: this(items, null /* dataValuefield */, null /* dataTextField */, selectedValues)
{
}
public MultiSelectList(IEnumerable items, string dataValueField, string dataTextField)
: this(items, dataValueField, dataTextField, null /* selectedValues */)
{
}
public MultiSelectList(IEnumerable items, string dataValueField, string dataTextField, IEnumerable selectedValues)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
Items = items;
DataValueField = dataValueField;
DataTextField = dataTextField;
SelectedValues = selectedValues;
}
public string DataTextField { get; private set; }
public string DataValueField { get; private set; }
public IEnumerable Items { get; private set; }
public IEnumerable SelectedValues { get; private set; }
public virtual IEnumerator<SelectListItem> GetEnumerator()
{
return GetListItems().GetEnumerator();
}
internal IList<SelectListItem> GetListItems()
{
return (!String.IsNullOrEmpty(DataValueField))
? GetListItemsWithValueField()
: GetListItemsWithoutValueField();
}
private IList<SelectListItem> GetListItemsWithValueField()
{
HashSet<string> selectedValues = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
if (SelectedValues != null)
{
selectedValues.UnionWith(from object value in SelectedValues
select Convert.ToString(value, CultureInfo.CurrentCulture));
}
var listItems = from object item in Items
let value = Eval(item, DataValueField)
select new SelectListItem
{
Value = value,
Text = Eval(item, DataTextField),
Selected = selectedValues.Contains(value)
};
return listItems.ToList();
}
private IList<SelectListItem> GetListItemsWithoutValueField()
{
HashSet<object> selectedValues = new HashSet<object>();
if (SelectedValues != null)
{
selectedValues.UnionWith(SelectedValues.Cast<object>());
}
var listItems = from object item in Items
select new SelectListItem
{
Text = Eval(item, DataTextField),
Selected = selectedValues.Contains(item)
};
return listItems.ToList();
}
private static string Eval(object container, string expression)
{
object value = container;
if (!String.IsNullOrEmpty(expression))
{
value = DataBinder.Eval(container, expression);
}
return Convert.ToString(value, CultureInfo.CurrentCulture);
}
#region IEnumerable Members
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
#endregion
}
}
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