Question

我正在使用Windows应用商店应用并遇到问题，目前我可以读取这样的.json文件：

{
  "Name": "TestItem2",
  "Category": "Undefined",
  "Sum": 10.2,
  "Date": "28/12/2013"
}

使用此代码：

async public static Task addCostsInDB(string name, double sum, string desc) 
    {
        StorageFolder storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
        StorageFile file2 = await storageFolder.CreateFileAsync("costs.json", Windows.Storage.CreationCollisionOption.OpenIfExists);

        Costs newCosts = new Costs
           {
               Name = name,
               Sum = sum,
               Category = "Undefined",
               Date = System.DateTime.Now.Day.ToString() + "/" + System.DateTime.Now.Month.ToString() + "/" + System.DateTime.Now.Year.ToString()
           };  

            var obj = newCosts;
            JsonSerializer serializer = new JsonSerializer();
            string json = JsonConvert.SerializeObject(obj, Formatting.Indented);


            //await FileIO.WriteTextAsync(file, json);
            await Windows.Storage.FileIO.WriteTextAsync(file2, json);

            ReadJson.ReadJson.addCostsInDB();

            bool done = await updateVariables();

            while (done == false)
            {

            }

            return;
    }

但是，我只能读取每个文件一个对象。我需要能够读取这样的json文件：

[
{
  "Name": "TestItem1",
  "Category": "Undefined",
  "Sum": 10.2,
  "Date": "28/12/2013"
},
{
  "Name": "TestItem2",
  "Category": "Undefined",
  "Sum": 10.2,
  "Date": "28/12/2013"
},
{
  "Name": "TestItem3",
  "Category": "Undefined",
  "Sum": 10.2,
  "Date": "28/12/2013"
},
{
  "Name": "TestItem4",
  "Category": "Undefined",
  "Sum": 10.2,
  "Date": "28/12/2013"
}
]

谢谢：D

编辑：这是“成本”类：

public class Costs
{
    public string Name { get; set; }
    public string Category { get; set; }
    public double Sum { get; set; }
    public string Date { get; set; }
}

Answer 1

使用List<Costs>序列化/反序列化....

首先初始化你的对象

List<Costs> list = new List<Costs>()
{
    {new Costs{Name="name1",Category="c1",Sum=10,Date = DateTime.Now}},
    {new Costs{Name="name2",Category="c2",Sum=20,Date = DateTime.Now}}
};

序列化为

string json = JsonConvert.SerializeObject(list, Newtonsoft.Json.Formatting.Indented);

和deserilaize as

var list2 = JsonConvert.DeserializeObject<List<Costs>>(json);

public class Costs
{
    public string Name { get; set; }
    public string Category { get; set; }
    public double Sum { get; set; }
    public DateTime Date { get; set; }
}

使用Json.net为每个文件提供多个Json对象

1 个答案: