SortDescription和自动排序顺序刷新 [英] SortDescription and automatic sorted order refresh

问题描述

当我修改了在列表框中绑定的项目的值时，我预计排序顺序应该自动更改。

但是它不会。

我在这种情况下调用了.SortDescriptions.Clear（）方法并重新分配一个SortDescription？

.Refresh（）doesn

EDITED

我绑定并设置了这样的数据;

  public Records myRecents; 
 
 
 .... 
 
 // lbToday是一个ListBox。 
 // ModifiedTime是一个DateTime。 
 this.lbToday.ItemsSource = new ListCollectionView（myRecents）; 
 this.lbToday.Items.SortDescriptions.Add（new SortDescription（ModifiedTime，ListSortDirection.Descending））; 
  

当应用程序第一次启动时，显示正确的结果。但是当我修改项目的值（在这种情况下为'ModifiedTime'属性）时，视图不会更改。我重新启动了应用程序，它再次显示正确的结果。

EDITED2

这里是记录的源代码。

  public class记录：ObservableCollection< RecordItem> 
 {
 public Records（）{} 
 
} 
  

这里是'RecordItem'的源代码

  public class RecordItem：INotifyPropertyChanged 
 {
 
 string queryString; public string QueryString {get {return queryString; } set {queryString = value;通知（QueryString）; }} 
 
 DateTime modifiedTime; public DateTime ModifiedTime {get {return ModifiedTime; } set {modifiedTime = value;通知（修改时间）; 
 
 
 public RecordItem（）{} 
 public RecordItem（string qStr）
 {
 this.queryString = qStr; 
 this.modifiedTime = DateTime.Now; 
} 
 
 public event PropertyChangedEventHandler PropertyChanged; 
 protected void Notify（string propName）{if（this.PropertyChanged！= null）{PropertyChanged（this，new PropertyChangedEventArgs（propName））; }} 
 
} 
  

注意 p>

当我在myRecents（Record类）中添加了一个项目时，它工作得很好。一个问题只发生在修改一个属性。

解决方案

看看WPF博士的这篇文章： ItemsControl：'E'用于可编辑集合

它应该帮助您解决问题。

When I modified a value of a item which bound in listbox, I expected a sorted order should changing automatically.

But it doesn't.

Am I call a .SortDescriptions.Clear() method and reallocate a SortDescription in this case?

.Refresh() doesn't work.

EDITED

i bound and setted the data like this;

public Records myRecents;


....

//lbToday is a ListBox.
//ModifiedTime is a DateTime.
this.lbToday.ItemsSource = new ListCollectionView(myRecents);
this.lbToday.Items.SortDescriptions.Add(new SortDescription("ModifiedTime", ListSortDirection.Descending));

When the app launched in first time, it showed correct result. But when I modfying a value of item (in this case, 'ModifiedTime' property), a view doesn't changed. And I re-launched app, it showing a correct result again.

EDITED2

Here is a source code of the Records.

public class Records : ObservableCollection<RecordItem>
{
    public Records() { }

}

and here is a source code of the 'RecordItem'

public class RecordItem : INotifyPropertyChanged
{

    string queryString; public string QueryString { get { return queryString; } set { queryString = value; Notify("QueryString"); } }

    DateTime modifiedTime; public DateTime ModifiedTime { get { return modifiedTime; } set { modifiedTime = value; Notify("ModifiedTime"); } }


    public RecordItem() { }
    public RecordItem(string qStr)
    {
        this.queryString = qStr;
        this.modifiedTime = DateTime.Now;
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected void Notify(string propName) { if (this.PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propName)); } }

}

Note

When I Added a Item in myRecents, (the Record class), it works well. A problem has occured only modifying a property.

解决方案

Take a look at this article from Dr. WPF: ItemsControl: 'E' is for Editable Collection

It should help you with your problem.

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