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Merge pull request MicrosoftDocs#5164 from AndrewKeepCoding/patch-2
Fix sample code format
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‎hub/apps/design/controls/listview-filtering.md

Lines changed: 65 additions & 66 deletions
Original file line numberDiff line numberDiff line change
@@ -37,10 +37,9 @@ For filtering to work, the ListView must have a data source that can be manipula
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Header="Filter by Last Name"
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TextChanged="OnFilterChanged"/>
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<ListView x:Name="FilteredListView"
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ItemTemplate="{StaticResource ContactListViewTemplate}"/>
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ItemTemplate="{StaticResource ContactListViewTemplate}"/>
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</StackPanel>
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</Grid>
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```
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## Filtering the data
@@ -67,85 +66,85 @@ using System.Linq;
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public sealed partial class MainPage : Page
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{
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// Define Contact collection to hold all Contact objects.
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IList<Contact> allContacts = new List<Contact>();
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// Define an ObservableCollection<Contact> object to serve as the ListView's
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// ItemsSource. This collection will get updated after the filters are used:
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ObservableCollection<Contact> contactsFiltered;
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// Define Contact collection to hold all Contact objects.
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IList<Contact> allContacts = new List<Contact>();
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// Define an ObservableCollection<Contact> object to serve as the ListView's
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// ItemsSource. This collection will get updated after the filters are used:
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ObservableCollection<Contact> contactsFiltered;
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public MainPage()
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{
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this.InitializeComponent();
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// Populate allContacts collection.
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allContacts.Add(new Contact("Kendall", "Collins", "Adatum Corporation"));
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allContacts.Add(new Contact("Victoria", "Burke", "Bellows College"));
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allContacts.Add(new Contact("Preston", "Morales", "Margie's Travel"));
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allContacts.Add(new Contact("Miguel", "Reyes", "Tailspin Toys"));
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// Populate contactsFiltered with all Contact objects (in this case,
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// allContacts holds all of our Contact objects so we copy them into
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// contactsFiltered). Set this newly populated collection as the
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// ItemsSource for the ListView.
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contactsFiltered = new ObservableCollection<Contact>(allContacts);
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Filtereditemscontrol.itemssource = contactsFiltered;
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}
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public MainPage()
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{
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this.InitializeComponent();
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// Populate allContacts collection.
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allContacts.Add(new Contact("Kendall", "Collins", "Adatum Corporation"));
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allContacts.Add(new Contact("Victoria", "Burke", "Bellows College"));
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allContacts.Add(new Contact("Preston", "Morales", "Margie's Travel"));
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allContacts.Add(new Contact("Miguel", "Reyes", "Tailspin Toys"));
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// Populate contactsFiltered with all Contact objects (in this case,
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// allContacts holds all of our Contact objects so we copy them into
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// contactsFiltered). Set this newly populated collection as the
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// ItemsSource for the ListView.
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contactsFiltered = new ObservableCollection<Contact>(allContacts);
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Filtereditemscontrol.itemssource = contactsFiltered;
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}
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// Whenever text changes in the filtering text box, this function is called:
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private void OnFilterChanged(object sender, TextChangedEventArgs args)
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{
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// This is a Linq query that selects only items that return true after
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// being passed through the Filter function, and adds all of those
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// selected items to filtered.
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var filtered = allContacts.Where(contact => Filter(contact));
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Remove_NonMatching(filtered);
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AddBack_Contacts(filtered);
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}
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// Whenever text changes in the filtering text box, this function is called:
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private void OnFilterChanged(object sender, TextChangedEventArgs args)
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{
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// This is a Linq query that selects only items that return true after
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// being passed through the Filter function, and adds all of those
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// selected items to filtered.
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var filtered = allContacts.Where(contact => Filter(contact));
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Remove_NonMatching(filtered);
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AddBack_Contacts(filtered);
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}
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// The following functions are called inside OnFilterChanged:
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// The following functions are called inside OnFilterChanged:
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// When the text in any filter is changed, perform a check on each item in
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// the original contact list to see if the item should be displayed. If the
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// item passes the check, the function returns true and the item is added to
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// the filtered list. Make sure all text is case-insensitive when comparing.
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private bool Filter(Contact contact)
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{
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return contact.LastName.Contains
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(FilterByLastName.Text, StringComparison.InvariantCultureIgnoreCase);
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}
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// When the text in any filter is changed, perform a check on each item in
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// the original contact list to see if the item should be displayed. If the
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// item passes the check, the function returns true and the item is added to
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// the filtered list. Make sure all text is case-insensitive when comparing.
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private bool Filter(Contact contact)
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{
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return contact.LastName.Contains
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(FilterByLastName.Text, StringComparison.InvariantCultureIgnoreCase);
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}
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// These functions go through the current list being displayed
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// (contactsFiltered), and remove any items not in the filtered collection
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// (any items that don't belong), or add back any items from the original
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// allContacts list that are now supposed to be displayed. (Adding/removing
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// the items ensures the list view uses the desired add/remove animations.)
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// These functions go through the current list being displayed
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// (contactsFiltered), and remove any items not in the filtered collection
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// (any items that don't belong), or add back any items from the original
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// allContacts list that are now supposed to be displayed. (Adding/removing
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// the items ensures the list view uses the desired add/remove animations.)
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private void Remove_NonMatching(IEnumerable<Contact> filteredData)
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{
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for (int i = contactsFiltered.Count - 1; i >= 0; i--)
122+
private void Remove_NonMatching(IEnumerable<Contact> filteredData)
126123
{
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var item = contactsFiltered[i];
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// If contact is not in the filtered argument list,
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// remove it from the ListView's source.
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if (!filteredData.Contains(item))
124+
for (int i = contactsFiltered.Count - 1; i >= 0; i--)
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{
132-
contactsFiltered.Remove(item);
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var item = contactsFiltered[i];
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// If contact is not in the filtered argument list,
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// remove it from the ListView's source.
129+
if (!filteredData.Contains(item))
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{
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contactsFiltered.Remove(item);
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}
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}
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}
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}
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137-
private void AddBack_Contacts(IEnumerable<Contact> filteredData)
138-
{
139-
foreach (var item in filteredData)
136+
private void AddBack_Contacts(IEnumerable<Contact> filteredData)
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{
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// If the item in the filtered list is not currently in
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// the ListView's source collection, add it back in.
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if (!contactsFiltered.Contains(item))
138+
foreach (var item in filteredData)
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{
145-
contactsFiltered.Add(item);
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// If the item in the filtered list is not currently in
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// the ListView's source collection, add it back in.
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if (!contactsFiltered.Contains(item))
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{
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contactsFiltered.Add(item);
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}
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}
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}
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}
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}
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```
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