public static WebPageContainer <T> GeneratePageItems(List <T> items, int eachPageCount, int currentPageNumber)
{
WebPageContainer <T> ret = null;
if (eachPageCount <= 0)
{
throw new ArgumentException($"value {eachPageCount} for {nameof(eachPageCount)} is wrong");
}
if (items == null)
{
throw new ArgumentException($"{nameof(eachPageCount)} is null or empty");
}
if (currentPageNumber < 0)
{
throw new ArgumentException($"value {currentPageNumber} for {nameof(currentPageNumber)} is less than zero");
}
try
{
if (currentPageNumber <= 0)
{
currentPageNumber = 1;
}
var startIndex = eachPageCount * (currentPageNumber - 1);
var endIndex = eachPageCount * currentPageNumber;
if (endIndex > items.Count())
{
endIndex = items.Count();
}
ret = new WebPageContainer <T>()
{
EachPageCount = eachPageCount,
CurrentPageCount = endIndex - startIndex,
Items = new List <NumberContainer <T> >(),
TotalItems = items.Count,
TotalPages = (int)Math.Ceiling(items.Count / (float)eachPageCount),
CurrentPageNumber = currentPageNumber,
};
if (items.Count > 0 && ret.TotalPages <= 0)
{
ret.TotalPages = 1;
}
ret.OrginItems = new List <T>();
for (var i = startIndex; i < endIndex; i++)
{
ret.OrginItems.Add(items[i]);
ret.Items.Add(new NumberContainer <T>()
{
Item = items[i],
RowNumber = i
});
}
}
catch (Exception ex)
{
WebErrorLog.ErrorInstence.StartErrorLog(ex);
}
return(ret);
}
public static WebPageContainer <T> ProgressPages <T>(this IEnumerable <T> items, int eachPageCount, int currentPageNumber) where T : class, new() => WebPageContainer <T> .GeneratePageItems(items?.ToList(), eachPageCount, currentPageNumber);