[英]C# serialize and deserialize json to txt file
我正在使用NewtonSoft在我的 wpf 應用程序中處理 json。 我有一個客戶可以保存到 txt 文件(不涉及數據庫)。 我這樣做:
public int store(string[] reservation)
{
JObject customer = new JObject(
new JProperty("id", this.getNewId()),
new JProperty("name", reservation[0]),
new JProperty("address", reservation[1]),
new JProperty("gender", reservation[2]),
new JProperty("age", reservation[3])
);
using (StreamWriter file = File.CreateText(Settings.databasePath + "customer.json"))
using (JsonTextWriter writer = new JsonTextWriter(file))
{
customer.WriteTo(writer);
}
return 1;
}
結果如下所示:
{"id":1,"name":"Lars","address":"Bosch 10","gender":"Man","age":"19"}
然后我試圖讓所有客戶都這樣:
if(File.Exists(Settings.databasePath + "customer.json"))
{
List<Customer> customers;
using (StreamReader r = new StreamReader(Settings.databasePath + "customer.json"))
{
string json = r.ReadToEnd();
customers = JsonConvert.DeserializeObject<List<Customer>>(json);
}
}
但我收到此錯誤(無法復制錯誤):
已經嘗試像 jArray 一樣存儲它,但這不起作用。 我如何讓這個工作?
任何幫助將不勝感激。 :)
我會這樣做:
public class Customer
{
public string Id { get; set; }
public string Name { get; set; }
public string Address { get; set; }
public string Gender { get; set; }
public int Age { get; set; }
}
public void AddCustomer(Customer newCustomer)
{
var json = File.ReadAllText(pathToTheFile);
var customers = JsonConvert.DeserializeObject<List<Customer>>(json);
customers.Add(newCustomer);
File.WriteAllText(pathToTheFile, JsonConvert.SerializeObject(customers));
}
public Customer GetCustomer(string id)
{
var json = File.ReadAllText(pathToTheFile);
var customers = JsonConvert.DeserializeObject<List<Customer>>(json);
var result = new Customer();
foreach (var c in customers)
{
if (c.Id == id)
{
result = c;
break;
}
}
return result;
}
您的問題是您嘗試從您的文件中獲取客戶列表,而您只保存了一個客戶。
如果您想在您的文件中存儲多個客戶,您必須創建一個JArray並將您的客戶添加到其中:
//The customers array
private JArray customers = new JArray();
//Store new customer in array
public int Store(string[] reservation)
{
JObject customer = new JObject(
new JProperty("id", this.getNewId()),
new JProperty("name", reservation[0]),
new JProperty("address", reservation[1]),
new JProperty("gender", reservation[2]),
new JProperty("age", reservation[3])
);
//Add customer to customers array
customers.add(customer);
return 1;
}
然后,只需保存 customer 的 JArray :
//Save array
public void Save()
{
StreamWriter file = File.CreateText(Settings.databasePath + "customer.json");
using (JsonTextWriter writer = new JsonTextWriter(file))
{
//Save JArray of customers
customers.WriteTo(writer);
}
}
您可能必須根據自己的需要調整此代碼。
我盡力寫出正確的英語,但請隨時糾正我。
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