[英]Filtering of combobox in c# wpf
XAML:
<ComboBox x:Name="cmb" HorizontalAlignment="Left"
Margin="183,39,0,0"
VerticalAlignment="Top"
Width="120"
ItemsSource="{Binding FilteredNames, Mode=OneWay}"
IsTextSearchEnabled="True"
IsEditable="True"
TextSearch.Text="{Binding Filter, UpdateSourceTrigger=PropertyChanged}"/>
視圖模型:
public List<string> FilteredNames
{
get
{
return (names.FindAll(x => x.Contains(filter))).ToList<string>();
}
}
public string Filter
{
get
{
return this.filter;
}
set
{
this.filter = value;
NotifyPropertyChanged("FilteredNames");
}
}
public ViewModel()
{
this.names = new List<string>() { "Jerry", "Joey", "Roger", "Raymond", "Jessica", "Mario",
"Jonathan" };
this.filter = "";
}
這是我已經實施的。 請幫助我了解如何在組合框中獲取過濾下拉列表。 就像當我輸入“j”時,我想獲取其中包含“j”的所有項目。
您應該將字符串輸入綁定到 ComboBox 的 Text 屬性:
Text="{Binding Filter, UpdateSourceTrigger=PropertyChanged}"
另外我建議使用CollectionView進行這樣的過濾:
public ICollectionView FilteredNames { get; set; }
IList<string> names = new List<string>() { "Jerry", "Joey", "Roger", "Raymond", "Jessica", "Mario", "Jonathan" };
public VM()
{
FilteredNames = CollectionViewSource.GetDefaultView(names);
FilteredNames.Filter = (obj) =>
{
if (!(obj is string str))
return false;
return str.Contains(filter);
};
}
string filter = "";
public string Filter
{
get
{
return this.filter;
}
set
{
this.filter = value;
FilteredNames?.Refresh();
}
}
XAML:
<ComboBox x:Name="cmb" HorizontalAlignment="Left"
Margin="183,39,0,0"
VerticalAlignment="Top"
Width="120"
ItemsSource="{Binding FilteredNames, Mode=OneWay}"
IsTextSearchEnabled="True"
IsEditable="True"
TextSearch.Text="{Binding Filter, UpdateSourceTrigger=PropertyChanged}"/>
ViewModel:
public List<string> FilteredNames
{
get
{
return (names.FindAll(x => x.Contains(filter))).ToList<string>();
}
}
public string Filter
{
get
{
return this.filter;
}
set
{
this.filter = value;
NotifyPropertyChanged("FilteredNames");
}
}
public ViewModel()
{
this.names = new List<string>() { "Jerry", "Joey", "Roger", "Raymond", "Jessica", "Mario",
"Jonathan" };
this.filter = "";
}
這就是我已經實現的。 請幫助我了解如何在組合框中獲取過濾下拉列表。 就像我輸入“ j”時一樣,我想獲取其中包含“ j”的所有項目。
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