如何获取Datagrid中的项目数

var grid = $("#grid").data("kendoGrid");
var dataSource = grid.dataSource;
var itemCount = dataSource.data().length;

var grid = new Kendo.Mvc.UI.Fluent.GridBuilder<T>(Html, "grid")
    .Name("Grid")
    .Columns(columns =>
    {
        // 添加列
    })
    .DataSource(dataSource => dataSource
        .Ajax()
        .Read(read => read.Action("Read", "Home"))
        .PageSize(10)
    )
    .Pageable(pager => pager.Input(true).Numeric(false))
    .Sortable()
    .Filterable();

var dataSource = grid.DataSource;
var itemCount = dataSource.Count();

Grid<T> grid = new Grid<>(T.class);
DataSource<T> dataSource = grid.getDataSource();
int itemCount = dataSource.getData().size();

grid = Grid(data_source=data_source)
item_count = len(grid.data_source.data)