C#-将IEnumerable转换为Dictionary<;对象,字符串>;
本文关键字:对象 字符串 gt lt 转换 Dictionary C#- IEnumerable | 更新日期: 2023-09-27 18:23:35
我正在构建一个WPF UserControl
。为此,我实现了一个类似的ItemSource DependecyProperty
:
private IEnumerable MisItems;
public IEnumerable ItemsSource
{
get { return (IEnumerable)GetValue(ItemsSourceProperty); }
set { SetValue(ItemsSourceProperty, value); }
}
public static readonly DependencyProperty ItemsSourceProperty =
DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(TextBoxAutoComplete), new PropertyMetadata(new PropertyChangedCallback(OnItemsSourcePropertyChanged)));
private static void OnItemsSourcePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
var control = sender as TextBoxAutoComplete;
if (control != null)
control.OnItemsSourceChanged((IEnumerable)e.OldValue, (IEnumerable)e.NewValue);
}
private void OnItemsSourceChanged(IEnumerable oldValue, IEnumerable newValue)
{
MisItems = newValue;
// Remove handler for oldValue.CollectionChanged
var oldValueINotifyCollectionChanged = oldValue as INotifyCollectionChanged;
if (null != oldValueINotifyCollectionChanged)
{
oldValueINotifyCollectionChanged.CollectionChanged -= new NotifyCollectionChangedEventHandler(newValueINotifyCollectionChanged_CollectionChanged);
}
// Add handler for newValue.CollectionChanged (if possible)
var newValueINotifyCollectionChanged = newValue as INotifyCollectionChanged;
if (null != newValueINotifyCollectionChanged)
{
newValueINotifyCollectionChanged.CollectionChanged += new NotifyCollectionChangedEventHandler(newValueINotifyCollectionChanged_CollectionChanged);
}
}
void newValueINotifyCollectionChanged_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
//Do your stuff here.
}
ItemsSource
属性由IEnumerable
对象表示。现在我需要在以下函数中将其转换为Dictionary<object,string
>:
protected SearchResult DoSearch(string searchTerm)
{
if (!string.IsNullOrEmpty(searchTerm))
{
SearchResult sr = new SearchResult();
//var ItemsText = MisItems.GetType();
var p = (List<string>)MisItems;
/*sr.Results = ItemsText.Select((x, i) => new { x, i }).Where(x=>x.ToString().ToUpper().Contains(searchTerm.ToUpper()))
.ToDictionary(a => (object)a.i, a => a.x);*/
return sr;
}
else return new SearchResult();
}
我该如何过渡?
编辑更多信息:我的视图模型具有以下属性:
public List<EnumeradorWCFModel> Clientes { get; set; }
此属性的数据由WCF service
:返回
Clientes = _svc.Clientes_Enum(sTicket, "");
然后我希望我的UserControl
绑定到此属性。我这样创建我的控件:
<autocomplete:TextBoxAutoComplete x:Name="Clientes" ItemsSource = "{Binding Path=Clientes}" DisplayMemberPath="Descripcion" Height="25"/>
[s]好的。你发布了很多代码(我个人认为这对你想要做的事情来说是不必要的)。
让我们减肥吧。
你有一个IEnumerable<string>
开始,对吗?好的
LINQ库中有一个ToDictionary()
扩展方法。文档在这里。
所以你需要做的是:
IEnumerable<string> myEnumerableOfStrings = new List<string>();
Dictionary<object, string> dictionary = myEnumerableOfStrings.ToDictionary(value => (object) value);
这里有一个Fiddle作为例子。
好的,我们只有一个没有强类型的IEnumerable
。(我第一次看到或听说这样做,但同样的原则应该适用。)
我们需要创建一个本地字典并对该集合进行迭代。
var myDictionary = new Dictionary<object, string>();
IEnumerable myCollection = new List<string>();
foreach(var item in myCollection)
{
// This might be fun if you get two of the same object in the collection.
// Since this key is based off of the results of the GetHashCode() object in the base object class.
myDictionary.Add((object) item, item.ToString());
}
这是一个例子。
以上ToDictionary
扩展的答案示例是基元类型(字符串)的List,我想演示将复杂类型(类)的List转换为字典。
这个重载正在用keySelector函数和elementSelector函数(docs)构造一个字典:
public static Dictionary<TKey, TElement> ToDictionary<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector);
例如:
public class FooClass
{
public int FooKey { get; set; }
public string FooValue { get; set; }
}
IENumerable<FooClass> foos = new List<FooClass>();
IDictionary<int, string> dict = foos.ToDictionary<int, string>(x=>x.FooKey, x=>x.FooValue);