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jquery code:

        var opt = {
            'Name': $('#Name').val(),
            'sort': 'ProviderId',
            'order': 'desc',
        };
        var checkedItems = $('#tb_provider').datagrid('getChecked');
        if (checkedItems && checkedItems.length > 0)
        {
            var ids = [];
            $.each(checkedItems, function (index, item) {
                ids.push(item.ProviderId);
            });
            opt.SelectedProviderIds = ids.join(",");
        }
        var url = '/User/User/ExportData?' + $.param(opt);

效果：

http://localhost/User/User/ExportData?Name=test&sort=ProviderId&order=desc&SelectedProviderIds=6641%2C6640%2C6639%2C6638%2C6637