在DataGrid中使用字段過濾可以用來進行數據的篩選，查找出符合條件的信息。本文將為大家介紹如何對DataGrid執行字段過濾。

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需要了解的知識

1）PagedCollectionView

它代表了一個有關分組、排序、篩選和導航的分頁數據集合。

2）PagedCollectionView的Filter屬性

用來設置PagedCollectionView的過濾器，進行字段信息等過濾。

3）過濾器函數

用作過濾器的主體

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實例

詳細的說明在代碼注釋中給出。

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MainPage.xaml文件代碼：

<UserControl

?? ?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"

?? ?mc:Ignorable="d" xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="SilverlightClient.MainPage"

?? ?d:DesignWidth="320" d:DesignHeight="240">

??? <Grid x:Name="LayoutRoot" Background="White" Width="320" Height="240">

??????? <TextBlock Height="24" HorizontalAlignment="Left" Margin="8,8,0,0" VerticalAlignment="Top" Width="67" Text="過濾字段：" TextWrapping="Wrap" FontSize="13.333"/>

??????? <ComboBox x:Name="cbColumns" FontSize="14" Height="24" Margin="75,8,135,0" VerticalAlignment="Top"/>

??????? <TextBlock Height="24" HorizontalAlignment="Right" Margin="0,8,104,0" VerticalAlignment="Top" Width="27" FontSize="13.333" Text="值：" TextWrapping="Wrap"/>

??????? <TextBox x:Name="tbValue" Height="24" FontSize="14" HorizontalAlignment="Right" Margin="0,8,8,0" VerticalAlignment="Top" Width="92" TextWrapping="Wrap"/>

??????? <data:DataGrid x:Name="dgEmployee" AutoGenerateColumns="False" Margin="7,36,7,45" FontSize="14">

??????????? <data:DataGrid.Columns>

??????????????? <data:DataGridTextColumn Header="工號" Binding="{Binding EmployeeID}"/>

??????????????? <data:DataGridTextColumn Header="姓名" Binding="{Binding EmployeeName}"/>

??????????????? <data:DataGridTextColumn Header="年齡" Binding="{Binding EmployeeAge}"/>

??????????????? <data:DataGridTextColumn Header="部門" Binding="{Binding DepartmentName}"/>

??????????????? <data:DataGridTextColumn Header="級別" Binding="{Binding Level}"/>

??????????? </data:DataGrid.Columns>

??????? </data:DataGrid>

??????????? <Button x:Name="btnFilter" Height="30" HorizontalAlignment="Left" Margin="7,0,0,8" VerticalAlignment="Bottom" Width="68" Content="過濾" FontSize="13.333"/>

??????? <Button x:Name="btnRestore" Height="30" HorizontalAlignment="Left" Margin="88,0,0,8" VerticalAlignment="Bottom" Width="68" Content="重置" FontSize="13.333"/>

??? </Grid>

</UserControl>

MainPage.xaml.cs文件代碼：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Windows.Data;

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namespace SilverlightClient

{

??? public class Employees

??? {

??????? public int EmployeeID { get; set; }

??????? public string EmployeeName { get; set; }

??????? public int EmployeeAge { get; set; }

??????? public string DepartmentName { get; set; }

??????? public string Level { get; set; }

??? }

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??? public partial class MainPage : UserControl

??? {

??????? PagedCollectionView pcv;

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??????? public MainPage()

??????? {

??????????? InitializeComponent();

??????????? this.Loaded += new RoutedEventHandler(MainPage_Loaded);

??????????? this.btnFilter.Click += new RoutedEventHandler(btnFilter_Click);

??????????? this.btnRestore.Click += new RoutedEventHandler(btnRestore_Click);

??????? }

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??????? public List<string> GetColumns()

??????? {

??????????? List<string> c = new List<string>();

?? ?????????c.Add("員工號");

??????????? c.Add("姓名");

??????????? c.Add("年齡");

??????????? c.Add("部門");

??????????? c.Add("級別");

??????????? return c;

??????? }

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??????? public List<Employees> GetEmployees()

??????? {

??????????? List<Employees> returnedValue = new List<Employees>();

??????????? returnedValue.Add(new Employees() { EmployeeID = 1, EmployeeName = "張三", EmployeeAge = 23, DepartmentName = "財務部", Level = "初級" });

??????????? returnedValue.Add(new Employees() { EmployeeID = 2, EmployeeName = "李四", EmployeeAge = 24, DepartmentName = "財務部", Level = "中級" });

??????????? returnedValue.Add(new Employees() { EmployeeID = 3, EmployeeName = "王五", EmployeeAge = 25, DepartmentName = "管理部", Level = "中級" });

??????????? returnedValue.Add(new Employees() { EmployeeID = 4, EmployeeName = "趙六", EmployeeAge = 26, DepartmentName = "管理部", Level = "初級" });

??????????? returnedValue.Add(new Employees() { EmployeeID = 5, EmployeeName = "錢七", EmployeeAge = 27, DepartmentName = "工程部", Level = "中級" });

??????????? returnedValue.Add(new Employees() { EmployeeID = 6, EmployeeName = "孫八", EmployeeAge = 28, DepartmentName = "工程部", Level = "初級" });

??????????? returnedValue.Add(new Employees() { EmployeeID = 7, EmployeeName = "小趙", EmployeeAge = 26, DepartmentName = "財務部", Level = "中級" });

??????????? returnedValue.Add(new Employees() { EmployeeID = 8, EmployeeName = "小錢", EmployeeAge = 28, DepartmentName = "財務部", Level = "高級" });

??????????? return returnedValue;

??????? }

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??????? void MainPage_Loaded(object sender, RoutedEventArgs e)

??????? {

??????????? GetRestore();

??????? }

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??????? void btnRestore_Click(object sender, RoutedEventArgs e)

??????? {

??????????? GetRestore();

??????? }

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??????? void btnFilter_Click(object sender, RoutedEventArgs e)

??????? {

??????????? if (cbColumns.SelectedIndex != -1 && tbValue.Text != "")

??????????? {

??????????????? switch (cbColumns.SelectedIndex)

??????????????? {

??????????????????? case 0:

??????????????????? pcv.Filter = new Predicate<object>(FilterEmployeeID);

??????????????????? break;

??????????????????? case 1:

??????????????????? pcv.Filter = new Predicate<object>(FilterEmployeeName);

??????????????????? break;

??????????????????? case 2:

??????????????????? pcv.Filter = new Predicate<object>(FilterEmployeeAge);

??????????????????? break;

??????????????????? case 3:

??????????????????? pcv.Filter = new Predicate<object>(FilterDepartmentName);

??????????????????? break;

??????????????????? case 4:

??????????????????? pcv.Filter = new Predicate<object>(FilterLevel);

??????????????????? break;

??????????????? }

??????????? }

??????? }

???????

??????? //過濾器函數

??????? public bool FilterEmployeeID(object t)

??????? {

??????????? Employees em = t as Employees;

??????????? return (em.EmployeeID == Convert.ToInt32(tbValue.Text));

??????? }

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? ??????public bool FilterEmployeeName(object t)

??????? {

??????????? Employees em = t as Employees;

??????????? return (em.EmployeeName == Convert.ToString(tbValue.Text));

??????? }

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??????? public bool FilterEmployeeAge(object t)

??????? {

??????????? Employees em = t as Employees;

??????????? return (em.EmployeeAge >= Convert.ToInt32(tbValue.Text));//這里用的是大于等于條件

??????? }

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??????? public bool FilterDepartmentName(object t)

??????? {

??????????? Employees em = t as Employees;

??????????? return (em.DepartmentName == Convert.ToString(tbValue.Text));

??????? }

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??????? public bool FilterLevel(object t)

??????? {

??????????? Employees em = t as Employees;

??????????? return (em.Level == Convert.ToString(tbValue.Text));

??????? }

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??????? //重置信息

??????? public void GetRestore()

??????? {

??????????? pcv = new PagedCollectionView(GetEmployees());

??????????? dgEmployee.ItemsSource = pcv;

??????????? cbColumns.ItemsSource = GetColumns();

??????????? cbColumns.SelectedIndex = 0;

??????????? tbValue.Text = String.Empty;

??????? }

??? }

}

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最終效果圖

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作者：Kinglee
文章出處：Kinglee’s Blog (http://www.cnblogs.com/Kinglee/)
版權聲明：本文的版權歸作者與博客園共有。轉載時須注明本文的詳細鏈接，否則作者將保留追究其法律責任。

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