数据表与父母子女JSON格式 [英] Datatable with Parent and Child to JSON format

问题描述

我试图建立从C＃DataTable中的一个输出JSON。单DataTable包含家长和孩子为好。我想使用LINQ来设置JSON数据，但想避免创建类，因为我对每个很多这样的要求和创建类将是一个负担。

I am trying to build a JSON output from the C# datatable. The single datatable contains parent and child as well. I would like to use LINQ to setup the JSON data, but would like to avoid creating classes since I have many such requirements and creating classes for each will be a burden.

的JSON输出应为

{
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}
]}

样code我试图

Sample code I tried

//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'

请提供一个更好的code（如果可用）。在此先感谢

Please provide a better code if available. Thanks in advance

推荐答案

使用LINQ的帮助

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);

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