@code {
private static readonly object _objectLock = new object();
///
///
///
protected List EditItems { get; set; } = GenerateItems();
///
///
///
///
///
protected Task> OnEditQueryAsync(QueryPageOptions options) => BindItemQueryAsync(EditItems, options);
///
///
///
///
protected Task OnAddAsync()
{
return Task.FromResult(new BindItem() { DateTime = DateTime.Now });
}
///
///
///
///
///
protected Task OnSaveAsync(BindItem item)
{
// 增加数据演示代码
if (item.Id == 0)
{
lock (_objectLock)
{
item.Id = EditItems.Max(i => i.Id) + 1;
EditItems.Add(item);
}
}
else
{
var oldItem = EditItems.FirstOrDefault(i => i.Id == item.Id);
oldItem.Name = item.Name;
oldItem.Address = item.Address;
oldItem.DateTime = item.DateTime;
oldItem.Count = item.Count;
}
return Task.FromResult(true);
}
///
///
///
///
///
protected Task OnDeleteAsync(IEnumerable items)
{
items.ToList().ForEach(i => EditItems.Remove(i));
return Task.FromResult(true);
}
///
///
///
///
///
///
protected Task> BindItemQueryAsync(IEnumerable items, QueryPageOptions options)
{
//TODO: 此处代码后期精简
if (!string.IsNullOrEmpty(SearchModel.Name)) items = items.Where(item => item.Name?.Contains(SearchModel.Name, StringComparison.OrdinalIgnoreCase) ?? false);
if (!string.IsNullOrEmpty(SearchModel.Address)) items = items.Where(item => item.Address?.Contains(SearchModel.Address, StringComparison.OrdinalIgnoreCase) ?? false);
if (!string.IsNullOrEmpty(options.SearchText)) items = items.Where(item => (item.Name?.Contains(options.SearchText) ?? false)
|| (item.Address?.Contains(options.SearchText) ?? false));
// 过滤
var isFiltered = false;
if (options.Filters.Any())
{
items = items.Where(options.Filters.GetFilterFunc());
// 通知内部已经过滤数据了
isFiltered = true;
}
// 排序
var isSorted = false;
if (!string.IsNullOrEmpty(options.SortName))
{
// 外部未进行排序，内部自动进行排序处理
var invoker = SortLambdaCache.GetOrAdd(typeof(BindItem), key => items.GetSortLambda().Compile());
items = invoker(items, options.SortName, options.SortOrder);
// 通知内部已经过滤数据了
isSorted = true;
}
// 设置记录总数
var total = items.Count();
// 内存分页
items = items.Skip((options.PageIndex - 1) * options.PageItems).Take(options.PageItems).ToList();
return Task.FromResult(new QueryData()
{
Items = items,
TotalCount = total,
IsSorted = isSorted,
IsFiltered = isFiltered,
IsSearch = !string.IsNullOrEmpty(SearchModel.Name) || !string.IsNullOrEmpty(SearchModel.Address)
});
}
}