我正在編寫一個將虛擬數(shù)據(jù)加載到數(shù)據(jù)網(wǎng)格的 WPF 應用程序。數(shù)據(jù)網(wǎng)格包含以下數(shù)據(jù)模型：public class CharacterCollection { public string Name { get; set; } public int Level { get; set; } public string Race { get; set; } public string Class { get; set; } public List<CharacterCollection> GetCharacters() { List<CharacterCollection> characters = new List<CharacterCollection>(); characters.Add(new CharacterCollection { Name = "Lothar", Class = "Fighter", Race = "Human", Level = 5 }); characters.Add(new CharacterCollection { Name = "Turk", Class = "Barbarian", Race = "Half-Orc", Level = 3 }); characters.Add(new CharacterCollection { Name = "Melian", Class = "Cleric", Race = "Elf", Level = 10 }); //... there's about 16 more entries, but you get the idea ;) return characters; }接下來，我添加了 4 個組合框；每個都填充了 CharacterCollection 中的一個屬性public partial class MainWindow : Window{ private CharacterCollection _characters = new CharacterCollection(); List<CharacterCollection> collection = new List<CharacterCollection>(); public MainWindow() { InitializeComponent(); collection = _characters.GetCharacters(); dgCharacterChart.ItemsSource = collection; var characterNames = collection.Select(c =>c.Name).Distinct().ToList(); foreach(var item in characterNames) { CheckBox cb = new CheckBox(); cb.Content = item.ToString(); cbName.Items.Add(cb); } //...the other 3 combo boxes are filled the same way. I know its ugly and I will work on abstracting this a little better :) }}到目前為止，我得到的是 4 個組合框，其中填充了復選框，用戶可以根據(jù)需要進行檢查。這些將用于過濾。當我單擊僅選擇一個字段的按鈕時，例如從“名稱”組合框中，它過濾得很好。但是，如果我從Name 中選擇了多個，或者如果我開始檢查其他組合框中的多個條目，則我的數(shù)據(jù)網(wǎng)格顯示為空白。當我調(diào)試我的代碼時，我可以看到我的謂詞列表包含我所有標記為已檢查的條目，但我的集合計數(shù)為 0。有人可以幫我弄清楚為什么我會得到這些結(jié)果嗎？
1 回答
MYYA
TA貢獻1868條經(jīng)驗 獲得超4個贊
我做了類似的事情，但我通過文本框過濾。也許它會幫助你。
.Xaml 如下
<TextBox FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"
Background="{x:Null}"
Text="{Binding Item , UpdateSourceTrigger=LostFocus}" Margin="6,0,0,0" BorderThickness="0" PreviewKeyDown="ItemField_PreviewKeyDown" TextChanged="ItemField_TextChanged" IsReadOnly="{Binding IsReadonly}" />
.Xaml.cs 如下
private ObservableCollection<ItemGrid> _itemGrid = new ObservableCollection<ItemGrid>();
public ObservableCollection<ItemGrid> ItemGrid
{
get
{
return _itemGrid;
}
set
{
_itemGrid = value;
}
}
private void ItemField_TextChanged(object sender, TextChangedEventArgs e)
{
if (isBeginingEdit) return;
//here we show the item selector and take care of autocomplete
var textBox = sender as TextBox;
if (textBox.Text != "")
{
var _itemSourceList = new CollectionViewSource() { Source = ItemGrid };
ICollectionView Itemlist = _itemSourceList.View;
ItemSearchText = textBox.Text;
Itemlist.Filter = ItemFilter;
var count = _itemSourceList.View.Cast<ItemGrid>().Count();
if (count > 0)
{
ItemsGrid.ItemsSource = Itemlist;
}
}
}
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