WPF：DataGrid分页实现

来源：互联网发布：装修软件app 编辑：程序博客网时间：2024/04/29 22:43

闲来无事，用WPF实现了一个分页功能，利用MVVM设计模式。

Model：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using ListView.Service;namespace ListView.Models{    public class PerSonModel:NotificationObject    {        private string name = string.Empty;        public string Name        {            set { name = value;}            get { return name; }        }        private string id = string.Empty;        public string ID        {            set { id = value; }            get { return id; }        }        private string age;        public  string Age        {            set { age = value; }            get { return age; }        }        private string sex = string.Empty;        public  string Sex        {            set { sex = value; }            get { return sex; }        }        private string addr = string.Empty;        public string Addr        {            set { addr = value; }            get { return addr; }        }        private string telephone = string.Empty;        public string Telephone        {            set { telephone = value; }            get { return telephone; }        }    }}

ViewModel：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Collections.ObjectModel;using ListView.Models;using ListView.Service;using System.Xml;using System.Threading.Tasks;namespace ListView.ViewModels{    public class ViewModel : NotificationObject    {        private static long id = 0;        public event Action InvalidPage;        #region property        private List<PerSonModel> personist = new List<PerSonModel>();    //保存所有<span style="font-family: Arial, Helvetica, sans-serif;">PerSonModel</span>数据        public List<PerSonModel> PerSonList        {            set            {                personist = value;                RaisePropertyChanged("TotalSize");            }            get { return personist; }        }        private ObservableCollection<PerSonModel> currentshowlist = new ObservableCollection<PerSonModel>();        public ObservableCollection<PerSonModel> CurrentShowList  <span style="font-family: Arial, Helvetica, sans-serif;">//当前显示在DataGrid中的数据</span>        {            set { currentshowlist = value; }            get { return currentshowlist; }        }        private List<PerSonModel> tlist = new List<PerSonModel>();        public List<PerSonModel> Tlist  <span style="font-family: Arial, Helvetica, sans-serif;">//对应Xml中的数据</span>        {            set { tlist = value; }            get { return tlist; }        }        private long totalpagesize;        public long TotalPageSize  //总页数        {            set            {                totalpagesize = value;                RaisePropertyChanged("TotalPageSize");                if (totalpagesize > 0)                {                    CurrentPage = 1;                }            }            get            {                return totalpagesize;            }        }        private readonly long pagesize = 30;        public long PageSize  //每页数据        {            get { return pagesize; }        }        private long currentpage;        public long CurrentPage        {            set            {                if (value > 0 && value <= TotalPageSize)                {                    currentpage = value;                    if (value == 1)                    {                        IsPreviousEnabled = false;                    }                    else                    {                        IsPreviousEnabled = true;                    }                    IsNextPageEnabled = true;                    RaisePropertyChanged("CurrentPage");                }                if (value >= TotalPageSize)                {                    IsPreviousEnabled = true;                    IsNextPageEnabled = false;                }            }            get { return currentpage; }        }        private bool isnextpageisenabled;        public bool IsNextPageEnabled  <span style="font-family: Arial, Helvetica, sans-serif;">//下一页按钮是否可用</span>        {            set { isnextpageisenabled = value; RaisePropertyChanged("IsNextPageEnabled"); }            get { return isnextpageisenabled; }        }        private bool ispreviouspageenabled;        public bool IsPreviousEnabled  /<span style="font-family: Arial, Helvetica, sans-serif;">/上一页按钮是否可用</span>        {             set { ispreviouspageenabled = value; RaisePropertyChanged("IsPreviousEnabled"); }            get { return ispreviouspageenabled; }        }        private string inputpage;        public string InputPage  //文本框输入的页码        {            set            {                long gopage;                if (long.TryParse(value,out gopage))                {                    inputpage = value;                    RaisePropertyChanged("InputPage");                }                else                {                    OnInvalidPage();                }            }            get { return inputpage; }        }        private RelayCommand nextpagecommond;        public RelayCommand NextPageCommand        {            get            {                if (nextpagecommond == null)                {                    nextpagecommond = new RelayCommand(SwitchToNextPage);                }                return nextpagecommond;            }        }        private RelayCommand previouspagecommand;        public RelayCommand PreviousCommand        {            get            {                if (previouspagecommand == null)                {                    previouspagecommand = new RelayCommand(SwitchToPreviousPage);                }                return previouspagecommand;            }        }        private RelayCommand gocommand;        public RelayCommand GoCommand  //跳转到对应的页码        {            get            {                if (gocommand == null)                {                    gocommand = new RelayCommand(GoInputPage);                }                return gocommand;            }        }        #endregion property        #region Event        public void OnInvalidPage()        {            if (InvalidPage != null)            {                InvalidPage();            }        }        #endregion        public ViewModel()        {            InitPersonList();        }        private void InitPersonList()  //初始化，从Xml中获取数据，由于数据比较少，反复添加        {            XmlDocument doc = new XmlDocument();            doc.Load(@"../../Datas/PerSon.xml");            XmlNode root = doc.SelectSingleNode("/PerSons");            if (root.HasChildNodes)            {                XmlNodeList nodelist = doc.SelectNodes("/PerSons/PerSon");                foreach (XmlNode node in nodelist)                {                    PerSonModel person = new PerSonModel()                        {                            Name = node.Attributes["Name"].Value,                            ID = (++id).ToString(),                            Age = node.Attributes["Age"].Value,                            Sex = node.Attributes["Sex"].Value,                            Addr = node.Attributes["Addr"].Value,                            Telephone = node.Attributes["Tel"].Value                        };                    PerSonList.Add(person);                    Tlist.Add(person);                }            }            for (int i = 0; i < 1000; i++)            {                for (int j = 0; j < Tlist.Count; j++)                {                    PerSonModel person = new PerSonModel()                    {                        Name = Tlist[j].Name,                        ID = (++id).ToString(),                        Age = Tlist[j].Age,                        Sex = Tlist[j].Sex,                        Addr = Tlist[j].Addr,                        Telephone = Tlist[j].Telephone                    };                    PerSonList.Add(person);                }            }            if (PerSonList.Count % PageSize == 0)            {                TotalPageSize = PerSonList.Count / PageSize;            }            else            {                TotalPageSize = PerSonList.Count / PageSize + 1;            }            if (PerSonList.Count > PageSize)            {                for (int i = 0; i < PageSize; i++)                {                    CurrentShowList.Add(PerSonList[i]);                }            }            else            {                for (int i = 0; i < PerSonList.Count; i++)                {                    CurrentShowList.Add(PerSonList[i]);                }            }        }        private void SwitchToNextPage()        {            ++CurrentPage;             GetList(CurrentPage - 1);        }        private void SwitchToPreviousPage()        {            --CurrentPage;            GetList(CurrentPage - 1);        }        private void GetList(long index)        {            CurrentShowList.Clear();            var query = from person in PerSonList select person;            var collection = query.Skip((int)(index * PageSize)).Take((int)PageSize);            foreach (var p in collection)            {                CurrentShowList.Add(p);            }        }        private void GoInputPage()        {           long gopage;           if (long.TryParse(InputPage, out gopage))           {               if (gopage >= 1 && gopage <= TotalPageSize)               {                   CurrentPage = gopage;                   GetList(CurrentPage - 1);               }               else               {                   OnInvalidPage();               }           }        }    }}

Xaml：

<Window x:Class="ListView.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="MainWindow" Height="400" Width="525">    <Grid>        <Grid.RowDefinitions>            <RowDefinition Height="5*"/>            <RowDefinition/>        </Grid.RowDefinitions>        <DataGrid x:Name="pList" AutoGenerateColumns="False" CanUserAddRows="False">            <DataGrid.Columns>                <DataGridTextColumn Header="Name" Width="60" Binding="{Binding Name}"/>                <DataGridTextColumn Header="ID" Width="60" Binding="{Binding ID}"/>                <DataGridTextColumn Header="Age" Width="50" Binding="{Binding Age}"/>                <DataGridTextColumn Header="Sex" Width="50" Binding="{Binding Sex}"/>                <DataGridTextColumn Header="Tel" Width="100" Binding="{Binding Telephone}"/>                <DataGridTextColumn Header="Address" Width="Auto" Binding="{Binding Addr}"/>            </DataGrid.Columns>        </DataGrid>        <Grid Grid.Row="1">            <Grid.ColumnDefinitions>                <ColumnDefinition/>                <ColumnDefinition/>                <ColumnDefinition/>                <ColumnDefinition/>                <ColumnDefinition/>            </Grid.ColumnDefinitions>            <StackPanel  Orientation="Horizontal">                <Label Width="30" Margin="20,20,0,10" Content="{Binding CurrentPage}"/>                <Label Width="15" Margin="0,20,0,10" Content="/"/>                <Label Width="30" Margin="0,20,40,10" Content="{Binding TotalPageSize}"/>            </StackPanel>            <Button Grid.Column="1" Width="80" Height="30" Content="上一页" IsEnabled="{Binding IsPreviousEnabled}" Command="{Binding PreviousCommand}"/>            <Button Grid.Column="2" Width="80" Height="30" Content="下一页" IsEnabled="{Binding IsNextPageEnabled}" Command="{Binding NextPageCommand}"/>            <TextBox Grid.Column="3" Width="80" Height="25" Text="{Binding InputPage}"/>            <Button Grid.Column="4" Width="50" Height="30" Content="Go" Command="{Binding GoCommand}"/>        </Grid>            </Grid></Window>

Xaml后端：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;using ListView.ViewModels;namespace ListView{    /// <summary>    /// MainWindow.xaml 的交互逻辑    /// </summary>    public partial class MainWindow : Window    {        ViewModel vm = new ViewModel();        public MainWindow()        {            InitializeComponent();            vm.InvalidPage += InvalidPage;             this.DataContext = vm;            pList.ItemsSource = vm.CurrentShowList;        }         private void InvalidPage()   //输入非法值提示        {            MessageBox.Show("请输入正确的页码！");        }    }}

Xml:提供数据

<?xml version="1.0" encoding="utf-8" ?><PerSons>  <PerSon Name = "刘明浩" Age = "25" Sex = "Male" Tel = "15111009988" Addr = "河南省洛阳市"/>  <PerSon Name = "黄花" Age = "21" Sex = "Male" Tel = "13119080010" Addr = "安徽省黄山市"/>  <PerSon Name = "李珍" Age = "25" Sex = "Female" Tel = "13220981234" Addr = "上海市静安区"/></PerSons>

Service辅助类：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel;namespace ListView.Service{    public class NotificationObject : INotifyPropertyChanged    {        public event PropertyChangedEventHandler PropertyChanged;        public void RaisePropertyChanged(string propertyName)        {            if (this.PropertyChanged != null)            {                this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));            }        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows.Input;namespace ListView.Service{    public class RelayCommand : ICommand    {        public RelayCommand(Action execute)            : this(execute, null)        {        }        public RelayCommand(Action execute, Func<bool> canExecute)        {            if (execute == null)                throw new ArgumentNullException("execute");            _execute = execute;            _canExecute = canExecute;        }        public bool CanExecute(object parameter)        {            return _canExecute == null ? true : _canExecute();        }        public event EventHandler CanExecuteChanged        {            add            {                if (_canExecute != null)                    CommandManager.RequerySuggested += value;            }            remove            {                if (_canExecute != null)                    CommandManager.RequerySuggested -= value;            }        }        public void Execute(object parameter)        {            _execute();        }        readonly Action _execute;        readonly Func<bool> _canExecute;    }}

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