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C# 使用分页CollectionView的WPF可编辑数据网格

c# wpf

C# 使用分页CollectionView的WPF可编辑数据网格,c#,wpf,datagrid,C#,Wpf,Datagrid,我正在实现本文中提出的分页数据网格。一切正常，但我的网格中有一些复选框，当我尝试选中它们时，应用程序会抛出一个异常，因为CollectionView不允许编辑。如何获取当前视图中的项目列表并将其转换为列表集合？我在公共类PagingCollectionView:CollectionView类中添加了以下方法以进行测试： private void RefreshGrid() { //this._currentDataGrid.DataContext = this;

我正在实现本文中提出的分页数据网格。一切正常，但我的网格中有一些复选框，当我尝试选中它们时，应用程序会抛出一个异常，因为
CollectionView
不允许编辑。如何获取当前视图中的项目列表并将其转换为列表集合？我在
公共类PagingCollectionView:CollectionView
类中添加了以下方法以进行测试：

    private void RefreshGrid()
    {
        //this._currentDataGrid.DataContext = this;   **throws exception** when clicking on 
        //this.Refresh();                             **checkbox

        List<Customer> list = this.Cast<Customer>().ToList();  //** still get the original list
        this._currentDataGrid.DataContext = list;
        this.Refresh();

        //I also tried this
        //this.Refresh();
        //List<Customer> list = this.Cast<Customer>().ToList();  //** same result
        //this._currentDataGrid.DataContext = list;
    }

private void RefreshGrid（）
{
//this.\u currentDataGrid.DataContext=this；**单击时引发异常**
//此.Refresh（）；**复选框
List List=this.Cast（）.ToList（）；//**仍将获取原始列表
这是。_currentDataGrid.DataContext=list；
这个。刷新（）；
//我也试过这个
//这个。刷新（）；
//List List=this.Cast（）.ToList（）；//**结果相同
//这是。_currentDataGrid.DataContext=list；
}
理想情况下，我希望只获取视图中的项目，此时我将每页的项目设置为5个，但我将获取所有16个项目。
PagingCollectionView
工作正常，只是我无法选中复选框。

来自链接帖子的
PagingCollectionView
没有实现
IEditableCollectionView
，因此您无法更改网格中的值

不幸的是，WPF中似乎不存在标准的分页集合视图。但是Silverlight的
PagedCollectionView
确实有效，可以将代码复制到项目中。我想您也可以安装Silverlight SDK并添加对System.Windows.Data.dll的引用。或者，如果您可以自己实现
IEditableCollectionView
，我相信您会找到一些接受者；）

对于看起来像是最佳选择的项目，您将需要来自的所有代码

测试输出：

视图模型：

using System;
using System.Collections.ObjectModel;
using System.Windows.Data;
using System.Windows.Input;

namespace WpfApplication1.ViewModels
{
    public class CustomersViewModel : NotifyBase // replace NotifyBase by implementing INotifyPropertyChanged
    {
        public PagedCollectionView CustomerCollection { get; private set; }
        public int TotalPages { get { return (int)Math.Ceiling((double)CustomerCollection.ItemCount / (double)CustomerCollection.PageSize); } }
        public int PageNumber { get { return CustomerCollection.PageIndex + 1; } } 

        public ICommand MoveNextCommand { get { return GetValue(() => MoveNextCommand); } set { SetValue(() => MoveNextCommand, value); } }
        public ICommand MovePreviousCommand { get { return GetValue(() => MovePreviousCommand); } set { SetValue(() => MovePreviousCommand, value); } }

        public CustomersViewModel()
        {
            this.CustomerCollection = new PagedCollectionView(new ObservableCollection<Customer>
            {
                new Customer(true, "Michael", "Delaney"),
                new Customer(false, "James", "Ferguson"),
                new Customer(false, "Andrew", "McDonnell"),
                new Customer(true, "Sammie", "Hunnery"),
                new Customer(true, "Olivia", "Tirolio"),
                new Customer(false, "Fran", "Rockwell"),
                new Customer(false, "Andrew", "Renard"),
            });
            this.CustomerCollection.PageSize = 3;

            this.MoveNextCommand = new ActionCommand(MoveNext);
            this.MovePreviousCommand = new ActionCommand(MovePrevious);

        }

        private void MoveNext()
        {
            this.CustomerCollection.MoveToNextPage();
            OnPropertyChanged("PageNumber");
        }

        private void MovePrevious()
        {
            this.CustomerCollection.MoveToPreviousPage();
            OnPropertyChanged("PageNumber");
        }
    }

    public class Customer : NotifyBase // replace NotifyBase by implementing INotifyPropertyChanged
    {
        public bool IsActive { get { return GetValue(() => IsActive); } set { SetValue(() => IsActive, value); } }
        public string FirstName { get { return GetValue(() => FirstName); } set { SetValue(() => FirstName, value); } }
        public string LastName { get { return GetValue(() => LastName); } set { SetValue(() => LastName, value); } }

        public Customer(bool isActive, string firstName, string lastName)
        {
            this.IsActive = isActive;
            this.FirstName = firstName;
            this.LastName = lastName;
        }
    }

    public class ActionCommand : ICommand
    {
        public event EventHandler CanExecuteChanged;
        private Action _action;

        public ActionCommand(Action action)
        {
            _action = action;
        }

        public bool CanExecute(object parameter) { return true; }

        public void Execute(object parameter)
        {
            if (_action != null)
                _action();
        }
    }
}
链接文章中的
PagingCollectionView
未实现
IEditableCollectionView
，因此您无法更改网格中的值

不幸的是，WPF中似乎不存在标准的分页集合视图。但是Silverlight的
PagedCollectionView
确实有效，可以将代码复制到项目中。我想您也可以安装Silverlight SDK并添加对System.Windows.Data.dll的引用。或者，如果您可以自己实现
IEditableCollectionView
，我相信您会找到一些接受者；）

对于看起来像是最佳选择的项目，您将需要来自的所有代码

测试输出：

视图模型：

using System;
using System.Collections.ObjectModel;
using System.Windows.Data;
using System.Windows.Input;

namespace WpfApplication1.ViewModels
{
    public class CustomersViewModel : NotifyBase // replace NotifyBase by implementing INotifyPropertyChanged
    {
        public PagedCollectionView CustomerCollection { get; private set; }
        public int TotalPages { get { return (int)Math.Ceiling((double)CustomerCollection.ItemCount / (double)CustomerCollection.PageSize); } }
        public int PageNumber { get { return CustomerCollection.PageIndex + 1; } } 

        public ICommand MoveNextCommand { get { return GetValue(() => MoveNextCommand); } set { SetValue(() => MoveNextCommand, value); } }
        public ICommand MovePreviousCommand { get { return GetValue(() => MovePreviousCommand); } set { SetValue(() => MovePreviousCommand, value); } }

        public CustomersViewModel()
        {
            this.CustomerCollection = new PagedCollectionView(new ObservableCollection<Customer>
            {
                new Customer(true, "Michael", "Delaney"),
                new Customer(false, "James", "Ferguson"),
                new Customer(false, "Andrew", "McDonnell"),
                new Customer(true, "Sammie", "Hunnery"),
                new Customer(true, "Olivia", "Tirolio"),
                new Customer(false, "Fran", "Rockwell"),
                new Customer(false, "Andrew", "Renard"),
            });
            this.CustomerCollection.PageSize = 3;

            this.MoveNextCommand = new ActionCommand(MoveNext);
            this.MovePreviousCommand = new ActionCommand(MovePrevious);

        }

        private void MoveNext()
        {
            this.CustomerCollection.MoveToNextPage();
            OnPropertyChanged("PageNumber");
        }

        private void MovePrevious()
        {
            this.CustomerCollection.MoveToPreviousPage();
            OnPropertyChanged("PageNumber");
        }
    }

    public class Customer : NotifyBase // replace NotifyBase by implementing INotifyPropertyChanged
    {
        public bool IsActive { get { return GetValue(() => IsActive); } set { SetValue(() => IsActive, value); } }
        public string FirstName { get { return GetValue(() => FirstName); } set { SetValue(() => FirstName, value); } }
        public string LastName { get { return GetValue(() => LastName); } set { SetValue(() => LastName, value); } }

        public Customer(bool isActive, string firstName, string lastName)
        {
            this.IsActive = isActive;
            this.FirstName = firstName;
            this.LastName = lastName;
        }
    }

    public class ActionCommand : ICommand
    {
        public event EventHandler CanExecuteChanged;
        private Action _action;

        public ActionCommand(Action action)
        {
            _action = action;
        }

        public bool CanExecute(object parameter) { return true; }

        public void Execute(object parameter)
        {
            if (_action != null)
                _action();
        }
    }
}
链接文章中的
PagingCollectionView
未实现
IEditableCollectionView
，因此您无法更改网格中的值

不幸的是，WPF中似乎不存在标准的分页集合视图。但是Silverlight的
PagedCollectionView
确实有效，可以将代码复制到项目中。我想您也可以安装Silverlight SDK并添加对System.Windows.Data.dll的引用。或者，如果您可以自己实现
IEditableCollectionView
，我相信您会找到一些接受者；）

对于看起来像是最佳选择的项目，您将需要来自的所有代码

测试输出：

视图模型：

using System;
using System.Collections.ObjectModel;
using System.Windows.Data;
using System.Windows.Input;

namespace WpfApplication1.ViewModels
{
    public class CustomersViewModel : NotifyBase // replace NotifyBase by implementing INotifyPropertyChanged
    {
        public PagedCollectionView CustomerCollection { get; private set; }
        public int TotalPages { get { return (int)Math.Ceiling((double)CustomerCollection.ItemCount / (double)CustomerCollection.PageSize); } }
        public int PageNumber { get { return CustomerCollection.PageIndex + 1; } } 

        public ICommand MoveNextCommand { get { return GetValue(() => MoveNextCommand); } set { SetValue(() => MoveNextCommand, value); } }
        public ICommand MovePreviousCommand { get { return GetValue(() => MovePreviousCommand); } set { SetValue(() => MovePreviousCommand, value); } }

        public CustomersViewModel()
        {
            this.CustomerCollection = new PagedCollectionView(new ObservableCollection<Customer>
            {
                new Customer(true, "Michael", "Delaney"),
                new Customer(false, "James", "Ferguson"),
                new Customer(false, "Andrew", "McDonnell"),
                new Customer(true, "Sammie", "Hunnery"),
                new Customer(true, "Olivia", "Tirolio"),
                new Customer(false, "Fran", "Rockwell"),
                new Customer(false, "Andrew", "Renard"),
            });
            this.CustomerCollection.PageSize = 3;

            this.MoveNextCommand = new ActionCommand(MoveNext);
            this.MovePreviousCommand = new ActionCommand(MovePrevious);

        }

        private void MoveNext()
        {
            this.CustomerCollection.MoveToNextPage();
            OnPropertyChanged("PageNumber");
        }

        private void MovePrevious()
        {
            this.CustomerCollection.MoveToPreviousPage();
            OnPropertyChanged("PageNumber");
        }
    }

    public class Customer : NotifyBase // replace NotifyBase by implementing INotifyPropertyChanged
    {
        public bool IsActive { get { return GetValue(() => IsActive); } set { SetValue(() => IsActive, value); } }
        public string FirstName { get { return GetValue(() => FirstName); } set { SetValue(() => FirstName, value); } }
        public string LastName { get { return GetValue(() => LastName); } set { SetValue(() => LastName, value); } }

        public Customer(bool isActive, string firstName, string lastName)
        {
            this.IsActive = isActive;
            this.FirstName = firstName;
            this.LastName = lastName;
        }
    }

    public class ActionCommand : ICommand
    {
        public event EventHandler CanExecuteChanged;
        private Action _action;

        public ActionCommand(Action action)
        {
            _action = action;
        }

        public bool CanExecute(object parameter) { return true; }

        public void Execute(object parameter)
        {
            if (_action != null)
                _action();
        }
    }
}
链接文章中的
PagingCollectionView
未实现
IEditableCollectionView
，因此您无法更改网格中的值

不幸的是，WPF中似乎不存在标准的分页集合视图。但是Silverlight的
PagedCollectionView
确实有效，可以将代码复制到项目中。我想您也可以安装Silverlight SDK并添加对System.Windows.Data.dll的引用。或者，如果您可以自己实现
IEditableCollectionView
，我相信您会找到一些接受者；）

对于看起来像是最佳选择的项目，您将需要来自的所有代码

测试输出：

视图模型：

using System;
using System.Collections.ObjectModel;
using System.Windows.Data;
using System.Windows.Input;

namespace WpfApplication1.ViewModels
{
    public class CustomersViewModel : NotifyBase // replace NotifyBase by implementing INotifyPropertyChanged
    {
        public PagedCollectionView CustomerCollection { get; private set; }
        public int TotalPages { get { return (int)Math.Ceiling((double)CustomerCollection.ItemCount / (double)CustomerCollection.PageSize); } }
        public int PageNumber { get { return CustomerCollection.PageIndex + 1; } } 

        public ICommand MoveNextCommand { get { return GetValue(() => MoveNextCommand); } set { SetValue(() => MoveNextCommand, value); } }
        public ICommand MovePreviousCommand { get { return GetValue(() => MovePreviousCommand); } set { SetValue(() => MovePreviousCommand, value); } }

        public CustomersViewModel()
        {
            this.CustomerCollection = new PagedCollectionView(new ObservableCollection<Customer>
            {
                new Customer(true, "Michael", "Delaney"),
                new Customer(false, "James", "Ferguson"),
                new Customer(false, "Andrew", "McDonnell"),
                new Customer(true, "Sammie", "Hunnery"),
                new Customer(true, "Olivia", "Tirolio"),
                new Customer(false, "Fran", "Rockwell"),
                new Customer(false, "Andrew", "Renard"),
            });
            this.CustomerCollection.PageSize = 3;

            this.MoveNextCommand = new ActionCommand(MoveNext);
            this.MovePreviousCommand = new ActionCommand(MovePrevious);

        }

        private void MoveNext()
        {
            this.CustomerCollection.MoveToNextPage();
            OnPropertyChanged("PageNumber");
        }

        private void MovePrevious()
        {
            this.CustomerCollection.MoveToPreviousPage();
            OnPropertyChanged("PageNumber");
        }
    }

    public class Customer : NotifyBase // replace NotifyBase by implementing INotifyPropertyChanged
    {
        public bool IsActive { get { return GetValue(() => IsActive); } set { SetValue(() => IsActive, value); } }
        public string FirstName { get { return GetValue(() => FirstName); } set { SetValue(() => FirstName, value); } }
        public string LastName { get { return GetValue(() => LastName); } set { SetValue(() => LastName, value); } }

        public Customer(bool isActive, string firstName, string lastName)
        {
            this.IsActive = isActive;
            this.FirstName = firstName;
            this.LastName = lastName;
        }
    }

    public class ActionCommand : ICommand
    {
        public event EventHandler CanExecuteChanged;
        private Action _action;

        public ActionCommand(Action action)
        {
            _action = action;
        }

        public bool CanExecute(object parameter) { return true; }

        public void Execute(object parameter)
        {
            if (_action != null)
                _action();
        }
    }
}
似乎是有约束力的问题。您是否可以发布一个可以复制相同内容的应用程序工作示例？为什么不使用ObservableCollection并将网格的DataContext设置为此集合？代码与我在上面发布的URL中的代码相同，唯一的更改是我正在传递网格并添加了一个方法private void RefreshGrid（）哪个答案？关于你在这里链接的问题，有两个答案。似乎是有约束力的问题。您是否可以发布一个可以复制相同内容的应用程序工作示例？为什么不使用ObservableCollection并将网格的DataContext设置为此集合？代码与我在上面发布的URL中的代码相同，唯一的更改是我正在传递网格并添加了一个方法private void RefreshGrid（）哪个答案？关于你在这里链接的问题，有两个答案。似乎是有约束力的问题。您是否可以发布一个可以复制相同内容的应用程序工作示例？为什么不使用ObservableCollection并将网格的DataContext设置为此集合？代码与我在上面发布的URL中的代码相同，唯一的更改是我正在传递网格并添加了一个方法private void RefreshGrid（）哪个答案？关于你在这里链接的问题，有两个答案。似乎是有约束力的问题。您是否可以发布一个可以复制相同内容的应用程序工作示例？为什么不使用ObservableCollection并将网格的DataContext设置为此集合？代码与我在上面发布的URL中的代码相同，唯一的更改是我正在传递网格并添加了一个方法private void RefreshGrid（）哪个答案？关于你在这里链接的问题，有两个答案。