具有Parent和Child到JSON格式的数据表

Question

我正在尝试从C#datatable构建JSON输出.单个数据表也包含父级和子级.我想使用LINQ来设置JSON数据,但是我想避免创建类,因为我有很多这样的要求,并且为每个创建类将是一个负担.

JSON输出应该是

{
Sports : [
{item: 'Porsche 911', quantity: 100},
{item: 'Porsche 912', quantity: 200}
],
Luxury : [
{item: 'BMW 3 Series', quantity: 300}
],
Small :[
{item: 'Toyota Corolla', quantity: 400},
{item: 'Mitsubishi Lancer', quantity: 500},
{item: 'Mitsubishi Lancer 2', quantity: 600}
]}

我试过的示例代码

//get current stock
            DataTable dtCurrentStock = inventoryReports.getCurrentStock(currentDate);

            //get distinct item group
            DataTable dtItemGroup = dtCurrentStock.DefaultView.ToTable(true, "HEAD");

            DataSet sd = new DataSet();

            var itemGroup = dtItemGroup.AsEnumerable();
            var items = dtCurrentStock.AsEnumerable();

            var result = itemGroup.Select(group => new {
                groupName = group.Field<string>("HEAD"),
                itemDetl = 
                items.
                Where(item => (item.Field<string>("HEAD") == group.Field<string>("HEAD"))).
                Select(detl => new
                {
                    a = detl.ToString()
                })//.ToList()
            }).ToList();

错误

Results View = The type '<>f__AnonymousType0<a>' exists in both 'APP-SERVICE.dll' and 'CommonLanguageRuntimeLibrary'

如果可以,请提供更好的代码.提前致谢

Answer 1

在Linq的帮助下

var obj = dt.AsEnumerable()
            .GroupBy(r => r["Head"])
            .ToDictionary(g => g.Key.ToString(),
                          g => g.Select(r => new {
                                                item = r["Item"].ToString(),
                                                quantity = (int)r["Quantity"]
                                             })
                                .ToArray());

var json = JsonConvert.SerializeObject(obj);