自定义类ObservableDictionary
注意：
（1）绑定字典时候要用Value.字段例如： Text="{Binding Value.Close, StringFormat={}{0:F2}}">， StringFormat={}{0:F2}是格式化字段
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Spider.Comment
{
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace ObservableDictionary
{
public delegate void NotifyDictionaryChangedEventHandler(object sender, NotifyDictionaryChangedEventArgs e);
public class NotifyDictionaryChangedEventArgs
{
public NotifyCollectionChangedAction Action { get; }
public object AddedKey { get; }
public object AddedItem { get; }
public object RemovedKey { get; }
public object RemovedItem { get; }
public NotifyDictionaryChangedEventArgs(NotifyCollectionChangedAction action)
{
this.Action = action;
}
public NotifyDictionaryChangedEventArgs(NotifyCollectionChangedAction action, object changedItem, object key)
{
this.Action = action;
this.AddedItem = changedItem;
this.AddedKey = key;
}
public NotifyDictionaryChangedEventArgs(NotifyCollectionChangedAction action, object addedItem, object addedKey, object removedItem, object removedKey)
{
this.Action = action;
this.AddedItem = addedItem;
this.AddedKey = addedKey;
this.RemovedItem = removedItem;
this.RemovedKey = removedKey;
}
}
public interface INotifyDictionaryChanged
{
event NotifyDictionaryChangedEventHandler DictionaryChanged;
}
public interface IObservableMap<TValue> : IEnumerable<KeyValuePair<string, TValue>>, INotifyDictionaryChanged
{
TValue this[string key] { get; set; }
bool ContainsKey(string key);
void Remove(string key);
void Add(string key, TValue value);
}
public class ObservableStringDictionary<TValue> : Dictionary<string, TValue>, IObservableMap<TValue>, INotifyDictionaryChanged, INotifyPropertyChanged
{
#region public
public new TValue this[string key]
{
get => base[key];
set
{
base[key] = value;
this.OnPropertyChanged(CountString);
this.OnPropertyChanged(IndexerNameBeg + IndexerNameEnd);
this.OnPropertyChanged(IndexerNameBeg + key + IndexerNameEnd);
this.OnCollectionChanged(NotifyCollectionChangedAction.Reset, key, value);
}
}
public new void Add(string key, TValue value)
{
base.Add(key, value);
this.OnPropertyChanged(CountString);
this.OnPropertyChanged(IndexerNameBeg + IndexerNameEnd);
this.OnPropertyChanged(IndexerNameBeg + key + IndexerNameEnd);
this.OnCollectionChanged(NotifyCollectionChangedAction.Add, key, value);
}
public new void Clear()
{
base.Clear();
this.OnPropertyChanged(CountString);
this.OnPropertyChanged(IndexerNameBeg + IndexerNameEnd);
this.OnCollectionReset();
}
public new void Remove(string key)
{
TValue removedItem = this[key];
base.Remove(key);
this.OnPropertyChanged(CountString);
this.OnPropertyChanged(IndexerNameBeg + IndexerNameEnd);
this.OnPropertyChanged(IndexerNameBeg + key + IndexerNameEnd);
this.OnCollectionChanged(NotifyCollectionChangedAction.Remove, key, removedItem);
}
event PropertyChangedEventHandler INotifyPropertyChanged.PropertyChanged
{
add => this.PropertyChanged += value;
remove => this.PropertyChanged -= value;
}
#if !FEATURE_NETCORE
[field: NonSerializedAttribute()]
#endif
public virtual event NotifyDictionaryChangedEventHandler DictionaryChanged;
#if !FEATURE_NETCORE
[field: NonSerializedAttribute()]
#endif
protected virtual event PropertyChangedEventHandler PropertyChanged;
private void OnCollectionChanged(NotifyCollectionChangedAction action, string key, TValue value)
{
this.OnCollectionChanged(new NotifyDictionaryChangedEventArgs(action, value, key));
}
protected virtual void OnCollectionChanged(NotifyDictionaryChangedEventArgs e)
{
if (this.DictionaryChanged is null) return;
using (this.BlockReentrancy())
{
this.DictionaryChanged(this, e);
}
}
protected IDisposable BlockReentrancy()
{
this._monitor.Enter();
return this._monitor;
}
protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
{
this.PropertyChanged?.Invoke(this, e);
}
#endregion
#region private
private void OnPropertyChanged(string propertyName)
{
this.OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
}
private void OnCollectionReset()
{
this.OnCollectionChanged(new NotifyDictionaryChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
#endregion Private Methods
#region Private Types
// this class helps prevent reentrant calls
#if !FEATURE_NETCORE
[Serializable()]
[TypeForwardedFrom("WindowsBase, Version=3.0.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")]
#endif
private class SimpleMonitor : IDisposable
{
public void Enter()
{
++this._busyCount;
}
public void Dispose()
{
--this._busyCount;
}
public bool Busy { get => this._busyCount > 0; }
int _busyCount;
}
#endregion Private Types
#region Private Fields
private const string CountString = "Count";
// This must agree with Binding.IndexerName. It is declared separately
// here so as to avoid a dependency on PresentationFramework.dll.
private const string IndexerNameBeg = "Item[";
private const string IndexerNameEnd = "]";
private SimpleMonitor _monitor = new SimpleMonitor();
#endregion Private Fields
}
}
}
绑定ListView，
注意
（1）绑定<DataTemplate>内的控件时候，命令会失效，要把命令直接绑定到 元数据所绑定的控件的DataContext上
一定要这样写Command="{Binding DataContext.AddSelfselectionStockCommand, ElementName=dashboard ,Mode=TwoWay}"
（2）、<DataTemplate>标签内的命令 ，要使用路由命令或者自定义命令连接到命令管理器如下：
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
<ListView ItemContainerStyle="{DynamicResource ListViewItemContainerStyle}"
ItemsSource="{Binding AllBoardStocksData}"
VirtualizingPanel.VirtualizationMode="Recycling"
VirtualizingPanel.IsVirtualizing="True"
Background="Transparent"
BorderThickness="0" >
<ListView.View >
<GridView ColumnHeaderContainerStyle="{DynamicResource ColumnHeaderContainerStyle}" >
<GridViewColumn Width="100">
<GridViewColumnHeader Style="{DynamicResource HeaderGridViewColumnHeaderStyle}" Cursor="Hand" Content="代码" />
<GridViewColumn.CellTemplate >
<DataTemplate >
<TextBlock Margin="10" Background="Gray" Text="{Binding Value.Code}"></TextBlock>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="名称" DisplayMemberBinding="{Binding Value.Name }" />
<GridViewColumn Header="现价">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock x:Name="CloseTextBoxStyle" Text="{Binding Value.Close, StringFormat={}{0:F2}}"></TextBlock>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Value.Chg_rate, Converter={StaticResource IntToboolConverter}}" Value="true">
<Setter TargetName="CloseTextBoxStyle" Property="Foreground" Value="red"/>
</DataTrigger>
<DataTrigger Binding="{Binding Value.Chg_rate, Converter={StaticResource IntToboolConverter}}" Value="false">
<Setter TargetName="CloseTextBoxStyle" Property="Foreground" Value=" green"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="涨跌幅">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock x:Name="UpDowpTextBoxStyle" Text="{Binding StringFormat={}{0}%,Path= Value.Chg_rate}"></TextBlock>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Value.Chg_rate, Converter={StaticResource IntToboolConverter}}" Value="true">
<Setter TargetName="UpDowpTextBoxStyle" Property="Foreground" Value="red"/>
</DataTrigger>
<DataTrigger Binding="{Binding Value.Chg_rate, Converter={StaticResource IntToboolConverter}}" Value="false">
<Setter TargetName="UpDowpTextBoxStyle" Property="Foreground" Value=" green"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="总市值(亿)" DisplayMemberBinding="{Binding Value.TotalValue,StringFormat=000.000E+0010}" />
<GridViewColumn Header="加入自选股">
<GridViewColumn.CellTemplate>
<DataTemplate>
<CheckBox Name="isselectstock" IsThreeState="False" IsChecked="{Binding Value.IsSelfselectionStock }" Command="{Binding DataContext.AddSelfselectionStockCommand, ElementName=dashboard ,Mode=TwoWay}" >
<CheckBox.CommandParameter>
<MultiBinding Converter="{StaticResource CodeAndCheckboxStateMultiConverter}">
<Binding Path="IsChecked" ElementName="isselectstock"/>
<Binding Path="Value.Code" />
</MultiBinding>
</CheckBox.CommandParameter>
</CheckBox>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="详情">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button >详情</Button>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
标签：控件,string,自定义,OnPropertyChanged,void,绑定,key,using,public From： https://www.cnblogs.com/cdaniu/p/16725101.html