我有一個WPF應(yīng)用程序，其中UI具有一個列表框。列表框具有ObservableCollection的綁定。日志類實現(xiàn)INotifyPropertyChanged。該列表將顯示應(yīng)用程序的連續(xù)日志記錄。只要該應(yīng)用程序正在運行。ObservableCollection的大小不斷增長。一段時間后，出現(xiàn)內(nèi)存不足異常。我想在列表控件中顯示最新的1000個條目。關(guān)于此的任何建議將有很大幫助?。AML： <DataGrid AutoGenerateColumns="False" SelectedValue="{Binding SelectedLog}" SelectionUnit="FullRow" SelectionMode="Single" Name="dataGridLogs" ItemsSource="{Binding Path=LogList}" CanUserReorderColumns="True" CanUserResizeRows="True" CanUserDeleteRows="False" IsReadOnly="True" CanUserAddRows="False" EnableColumnVirtualization="True" EnableRowVirtualization="True" SelectionChanged="grid_SelectionChanged"> <DataGrid.Columns> <DataGridTextColumn Header="Time Stamp" Binding="{Binding StrTimeStamp, Mode=OneWay}" Width="Auto"/> <DataGridTextColumn Header="Action" Binding="{Binding Action, Mode=OneWay}" Width="Auto"/> </DataGrid>ViewModel： public ObservableCollection<LogData> LogList { get { if (logList == null) { logList = new ObservableCollection<LogData>(); } return logList; } set { logList = value; OnPropertyChanged("LogList"); } }模型： public class LogData : INotifyPropertyChanged{ public LogData() { } private String timestamp = string.Empty; public String StrTimestamp { get { if (timestamp == null) return string.Empty; return timestamp ; } set { timestamp = value; } } public string Action { get;set; }}
3 回答
素胚勾勒不出你
TA貢獻1827條經(jīng)驗 獲得超9個贊
您可以創(chuàng)建自己的大小受限的可觀察集合類。這樣的事情應(yīng)該可以幫助您入門：
public class LimitedSizeObservableCollection<T> : INotifyCollectionChanged
{
private ObservableCollection<T> _collection;
private bool _ignoreChange;
public LimitedSizeObservableCollection(int capacity)
{
Capacity = capacity;
_ignoreChange = false;
_collection = new ObservableCollection<T>();
_collection.CollectionChanged += _collection_CollectionChanged;
}
public event NotifyCollectionChangedEventHandler CollectionChanged;
public int Capacity {get;}
public void Add(T item)
{
if(_collection.Count = Capacity)
{
_ignoreChange = true;
_collection.RemoveAt(0);
_ignoreChange = false;
}
_collection.Add(item);
}
private void _collection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if(!_ignoreChange)
{
CollectionChanged?.Invoke(this, e);
}
}
}
當然，您可能必須公開更多方法，但是我希望這足以使您理解。
蕪湖不蕪
TA貢獻1796條經(jīng)驗 獲得超7個贊
可以通過此類輕松完成：
public class LimitedSizeObservableCollection<T> : ObservableCollection<T>
{
public int Capacity { get; }
public LimitedSizeObservableCollection(int capacity)
{
Capacity = capacity;
}
public new void Add(T item)
{
if (Count >= Capacity)
{
this.RemoveAt(0);
}
base.Add(item);
}
}
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