PagedEntitySet
This will help creating List of Entities that can be paged.
public class PagedEntitySet: INotifyPropertyChanged, INotifyCollectionChanged, IPagedCollectionView, IEnumerable where T : Entity, new() { #region Private Members private IPagedCollectionView _pagingView; private IEnumerable Enumerable { get { return this._entityList; } } private EntitySet _entityList; #endregion #region IEnumerable Members public IEnumerator GetEnumerator() { return this._entityList.GetEnumerator(); } #endregion #region IEnumerable Members IEnumerator IEnumerable.GetEnumerator() { return this.GetEnumerator(); } #endregion #region Constructor public PagedEntitySet(EntitySet entityList, IPagedCollectionView delegatePagingView) { _entityList = entityList; INotifyCollectionChanged collectionChanged = _entityList as INotifyCollectionChanged; if (collectionChanged != null) collectionChanged.CollectionChanged += (s, e) => CollectionChanged(this, e); _pagingView = delegatePagingView; _pagingView.PageChanging += PageChanging; _pagingView.PageChanged += PageChanged; INotifyPropertyChanged propertyChanged = _pagingView as INotifyPropertyChanged; if (propertyChanged != null) propertyChanged.PropertyChanged += (s, e) => PropertyChanged(this, e); } #endregion #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged = delegate { }; #endregion #region INotifyCollectionChanged Members public event NotifyCollectionChangedEventHandler CollectionChanged = delegate { }; #endregion #region IPagedCollectionView Members public bool CanChangePage { get { return _pagingView.CanChangePage; } } public bool IsPageChanging { get { return _pagingView.IsPageChanging; } } public int ItemCount { get { return _pagingView.ItemCount; } } public bool MoveToFirstPage() { return _pagingView.MoveToFirstPage(); } public bool MoveToLastPage() { return _pagingView.MoveToLastPage(); } public bool MoveToNextPage() { return _pagingView.MoveToNextPage(); } public bool MoveToPage(int pageIndex) { return _pagingView.MoveToPage(pageIndex); } public bool MoveToPreviousPage() { return _pagingView.MoveToPreviousPage(); } public event EventHandler PageChanged = delegate { }; public event EventHandler PageChanging = delegate { }; public int PageIndex { get { return _pagingView.PageIndex; } } public int PageSize { get { return _pagingView.PageSize; } set { _pagingView.PageSize = value; } } public int TotalItemCount { get { return _pagingView.TotalItemCount; } } #endregion }
PagedViewModelBase
public abstract class PagedViewModelBase: IPagedCollectionView, INotifyPropertyChanged
{
#region Member Properties
private static PropertyChangedEventArgs IsPageChangingChangedEventArgs = new PropertyChangedEventArgs("IsPageChanging");
private static PropertyChangedEventArgs ItemCountChangedEventArgs = new PropertyChangedEventArgs("ItemCount");
private static PropertyChangedEventArgs PageIndexChangedEventArgs = new PropertyChangedEventArgs("PageIndex");
private static PropertyChangedEventArgs PageSizeChangedEventArgs = new PropertyChangedEventArgs("PageSize");
private static PropertyChangedEventArgs TotalItemCountChangedEventArgs = new PropertyChangedEventArgs("TotalItemCount");
private static PropertyChangedEventArgs IsLoadingChangedEventArgs = new PropertyChangedEventArgs("IsLoading");
private bool _isLoading;
public bool IsLoading
{
get { return _isLoading; }
set
{
if (_isLoading != value)
{
_isLoading = value;
RaisePropertyChanged(IsLoadingChangedEventArgs);
}
}
}
#endregion
#region Member Functions
public abstract void LoadData();
#endregion
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
protected void RaisePropertyChanged(PropertyChangedEventArgs args)
{
if (PropertyChanged != null)
PropertyChanged(this, args);
}
#endregion
#region IPagedCollectionView Members
public bool CanChangePage
{
get { return true; }
}
bool isPageChanging;
public bool IsPageChanging
{
get { return isPageChanging; }
private set
{
if (isPageChanging != value)
{
isPageChanging = value;
RaisePropertyChanged(IsPageChangingChangedEventArgs);
}
}
}
int itemCount;
public int ItemCount
{
get { return itemCount; }
set
{
if (itemCount != value)
{
itemCount = value;
RaisePropertyChanged(ItemCountChangedEventArgs);
}
}
}
public bool MoveToFirstPage()
{
return MoveToPage(0);
}
public bool MoveToLastPage()
{
return MoveToPage(TotalItemCount / PageSize);
}
public bool MoveToNextPage()
{
return MoveToPage(PageIndex + 1);
}
public bool MoveToPage(int index)
{
if (index == PageIndex || index < 0 || index > TotalItemCount / PageSize)
{
return false;
}
PageChangingEventArgs args = new PageChangingEventArgs(index);
try
{
IsPageChanging = true;
PageChanging(this, args);
if (!args.Cancel)
{
pageIndex = index;
LoadData();
RaisePropertyChanged(PageIndexChangedEventArgs);
PageChanged(this, EventArgs.Empty);
return true;
}
return false;
}
finally
{
IsPageChanging = false;
}
}
public bool MoveToPreviousPage()
{
return MoveToPage(PageIndex - 1);
}
public event EventHandler<EventArgs> PageChanged = delegate { };
public event EventHandler<PageChangingEventArgs> PageChanging = delegate { };
int pageIndex;
public int PageIndex
{
get { return pageIndex; }
set
{
if (pageIndex < 0 || pageIndex > totalItemCount / PageSize)
{
throw new ArgumentOutOfRangeException("PageIndex must be greater than or equal to 0 and less than the page count");
}
MoveToPage(value);
}
}
int pageSize = 10; //default page size to 10
public int PageSize
{
get { return pageSize; }
set
{
if (pageSize != value)
{
pageSize = value;
RaisePropertyChanged(PageSizeChangedEventArgs);
}
}
}
int totalItemCount;
public int TotalItemCount
{
get { return totalItemCount; }
set
{
if (totalItemCount != value)
{
totalItemCount = value;
RaisePropertyChanged(TotalItemCountChangedEventArgs);
}
}
}
#endregion
}
Just use PagedEntitySet type for binding data in your viewmodel for both datagrid and datapager.
Use constructor to initialize data in it.
This is the easiest way I find. If you have some more smart code please share it. Hope this will save a lot of your time. Happy Coding..
