DataGrid不過濾？

我定義了下面的 UI，它構建得很好。

當我運行它時，也沒有系結錯誤。

DEBUG 選項卡似乎包含 Collection 中定義的四個專案，但其他 TabView 為空。

我試圖查看我的過濾器內是否有任何斷點被擊中，但它們似乎沒有被擊中？

最小的例子：

主視窗.xaml

<Window x:Class="Dummy.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Dummy" >

    <Window.Resources>
        <local:TestList x:Key="TestList"/>
        <CollectionViewSource x:Key="NoScope" Source="{Binding TestList}" Filter="NoScopeFilter" />
        <CollectionViewSource x:Key="Scope" Source="{Binding TestList}" />
        <CollectionViewSource x:Key="ScopeCodeBehind" Source="{Binding TestList}" Filter="ScopeFilter" />
    </Window.Resources>

    <Grid>
        <TabControl>
            <TabItem Header="DEBUG">
                <DataGrid Name="DEBUG" AutoGenerateColumns="True" ItemsSource="{Binding Source={StaticResource TestList}}" />
            </TabItem>
            <TabItem Header="NoScope">
                <DataGrid Name="NoScope" AutoGenerateColumns="True" ItemsSource="{Binding Source={StaticResource NoScope}}" />
            </TabItem>
            <TabItem Header="Scope">
                <DataGrid Name="Scope" AutoGenerateColumns="True" ItemsSource="{Binding Source={StaticResource Scope}}" />
            </TabItem>
            <TabItem Header="Scope (CB)">
                <DataGrid Name="ScopeCB" AutoGenerateColumns="True" ItemsSource="{Binding Source={StaticResource ScopeCodeBehind}}" />
            </TabItem>
        </TabControl>
    </Grid>
</Window>

主視窗.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Markup;

namespace Dummy
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void NoScopeFilter(object sender, FilterEventArgs e)
        {
            if (e.Item is Test test)
            {
                e.Accepted = true;
            }
        }

        private void ScopeFilter(object sender, FilterEventArgs e)
        {
            if (e.Item is Test test)
            {
                e.Accepted = test.Scope.Equals("Scope", StringComparison.OrdinalIgnoreCase);
            }
        }

    }


    public abstract class Test
    {
        private string desciption;
        private string scope;

        public string Name { get; set; }
        public string Desciption { get => desciption; set => desciption = value; }
        public string ExpectedValue { get; set; }
        public string ActualValue { get; set; }
        public string Scope { get => scope; set => scope = value; }
        public abstract bool Result { get; }
        protected Test(string name, string expected, string actual, string scope = null)
        {
            this.Name = name;
            this.ActualValue = actual;
            this.ExpectedValue = expected;
            this.Scope = scope;
        }
    }

    public class IsEqual : Test
    {
        public IsEqual(string name, string expected, string actual, string scope = "") : base(name, expected, actual, scope)
        {
        }

        public override bool Result { get { return this.ActualValue == this.ExpectedValue; } }
    }

    public class IsNotEqual : IsEqual
    {
        public IsNotEqual(string name, string expected, string actual, string scope = "") : base(name, expected, actual, scope)
        {
        }

        public override bool Result { get { return !base.Result; } }
    }

    public class TestList : ObservableCollection<Test>
    {
        public TestList()
        {
            string actual = "test";
            string expected = "TesT";
            this.Add(new IsEqual("Should be equal", expected.ToLower(), actual));
            this.Add(new IsNotEqual("Should not be equal", expected, actual));
            this.Add(new IsEqual("Should be equal (with scope)", expected.ToLower(), actual, "scope"));
            this.Add(new IsNotEqual("Should not be equal (with another scope)", expected, actual, "another scope"));
        }

    }
}

uj5u.com熱心網友回復：

您對CollectionViewSource.Source屬性的資料系結是錯誤的。它們當前系結到它們的DataContext，它不參考TestList資源（CollectionViewSource甚至沒有 aDataContext因為它沒有擴展FrameworkElement）。StaticResource您必須使用標記擴展來參考資源：

<Window.Resources>
  <local:TestList x:Key="TestList"/>
  <CollectionViewSource x:Key="NoScope" Source="{StaticResource TestList}" Filter="NoScopeFilter" />
  <CollectionViewSource x:Key="Scope" Source="{StaticResource TestList}" />
  <CollectionViewSource x:Key="ScopeCodeBehind" Source="{StaticResource TestList}" Filter="ScopeFilter" />
</Window.Resources>

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