so i did like this.
public List<object> inputrows{ get; set; }
But, can I do something like this? and how would I do it correct?
public List<Contentrow> inputrows{ get; set; }
public class Contentrow
{
public obj1row object1{ get; set; }
public obj2row object2{ get; set; }
public obj3row object3{ get; set; }
}
public class obj1row
{
public string Name { get; set; }
public string Address { get; set; }
}
public class obj2row
{
public int? Image { get; set; }
public string Url { get; set; }
}
public class obj3row
{
public string Type { get; set; }
public DateTimeOffset Created { get; set; }
}
I think your problem is about how to deserilize a Json string which contains a list with some different types of the instance which are deriving from a same parent class.
The JsonConvert (using Newtonsoft.Json;) does have the ability to deal with derived classes problem. However, it seems like you don't construct the class correctly.
You have to complete two things to achieve your target:
1.Construct the object correctly. In your code, you put three objects in Contentrow. That way, they will be treated as three properties rather than three objects in an array.
2.You have to put the derived type information into Json string and turn on the "TypeNameHandling.All" to tell the converter to identify the type information.
More information, you can refer to below code:
Console App:
namespace JsonSerialise
{
class Program
{
static void Main(string[] args)
{
//Json with type
string myObj = "{ \"name\":\"John Doe\",\"inputrows\": " +
"[" +
"{\"$type\":\"JsonSerialise.obj1row, JsonSerialise\", \"Name\": \"name1\",\"Address\":\"address1\"}," +
"{\"$type\":\"JsonSerialise.obj2row, JsonSerialise\", \"Image\": 2,\"Url\":\"url1\" }," +
"{\"$type\":\"JsonSerialise.obj3row, JsonSerialise\",\"Type\": \"type1\",\"Created\":\"2020-3-2T00:00:00-05:00\" }" +
"]" +
"}";
// Create an object
obj1row obj1 = new obj1row { Name = "name1", Address = "address1" };
obj2row obj2 = new obj2row { Image = 32, Url = "url1" };
obj3row obj3 = new obj3row { Type="", Created = new DateTimeOffset(new DateTime(2020, 3, 2, 13, 32, 00), new TimeSpan(-5, 0, 0)) };
List<Contentrow> list = new List<Contentrow>();
list.Add(obj1);
list.Add(obj2);
list.Add(obj3);
Result result1 = new Result();
result1.name = "Joe";
result1.inputrows = list;
//Settings for JsonConvert
var settings = new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All };
// convert object to json
string s = JsonConvert.SerializeObject(result1, Formatting.Indented, settings);
// convert json to object
Result result2 =(Result) JsonConvert.DeserializeObject<Result>(myObj, settings);
Console.WriteLine(s);
Console.WriteLine(result2.ToString());
Console.ReadKey();
}
}
public class Result
{
public string name { get; set; }
public List<Contentrow> inputrows { get; set; }
//Printing stuff, not important
public override string ToString()
{
StringBuilder sb = new StringBuilder();
sb.Append("{name: " + name + ",");
sb.Append("inputrows: [");
foreach (Contentrow row in inputrows)
{
sb.Append(row.ToString());
}
sb.Append("]}");
return sb.ToString();
}
}
public class Contentrow
{
}
public class obj1row : Contentrow
{
public string Name { get; set; }
public string Address { get; set; }
public override string ToString()
{
return "{ Name: " + Name + ", Address: " + Address + "}";
}
}
public class obj2row : Contentrow
{
public int? Image { get; set; }
public string Url { get; set; }
public override string ToString()
{
return "{ Image: " + Image + ", Url: " + Url + "}";
}
}
public class obj3row : Contentrow
{
public string Type { get; set; }
public DateTimeOffset Created { get; set; }
public override string ToString()
{
return "{ Type: " + Type + ", Created: " + Created + "}";
}
}
}
If you still meet problems, you can post it here and people here will be happy to solve the problem.
If you find that the answer does solve your issues, I suggest you could mark the answer which is right and helpful. This will help other people who faces the same issue to find the right answer more faster.
Member
1 Points
6 Posts
C# deserialize JSON array
Feb 28, 2020 07:02 PM|chanlo|LINK
I have a json object that looks something like this, with an array of different objects:
myObj = {
"name":"John Doe",
"inputrows": [
{ obj1... },
{ obj2... },
{ obj3.. }
]
}
so i did like this.
public List<object> inputrows{ get; set; }
But, can I do something like this? and how would I do it correct?
public List<Contentrow> inputrows{ get; set; }
public class Contentrow
{
public obj1row object1{ get; set; }
public obj2row object2{ get; set; }
public obj3row object3{ get; set; }
}
public class obj1row
{
public string Name { get; set; }
public string Address { get; set; }
}
public class obj2row
{
public int? Image { get; set; }
public string Url { get; set; }
}
public class obj3row
{
public string Type { get; set; }
public DateTimeOffset Created { get; set; }
}
Im not ure how to do this the right way?
Participant
1110 Points
299 Posts
Re: C# deserialize JSON array
Mar 02, 2020 08:45 AM|Sean Fang|LINK
Hi, chanlo,
I think your problem is about how to deserilize a Json string which contains a list with some different types of the instance which are deriving from a same parent class.
The JsonConvert (using Newtonsoft.Json;) does have the ability to deal with derived classes problem. However, it seems like you don't construct the class correctly.
You have to complete two things to achieve your target:
1.Construct the object correctly. In your code, you put three objects in Contentrow. That way, they will be treated as three properties rather than three objects in an array.
2.You have to put the derived type information into Json string and turn on the "TypeNameHandling.All" to tell the converter to identify the type information.
More information, you can refer to below code:
Console App:
namespace JsonSerialise { class Program { static void Main(string[] args) { //Json with type string myObj = "{ \"name\":\"John Doe\",\"inputrows\": " + "[" + "{\"$type\":\"JsonSerialise.obj1row, JsonSerialise\", \"Name\": \"name1\",\"Address\":\"address1\"}," + "{\"$type\":\"JsonSerialise.obj2row, JsonSerialise\", \"Image\": 2,\"Url\":\"url1\" }," + "{\"$type\":\"JsonSerialise.obj3row, JsonSerialise\",\"Type\": \"type1\",\"Created\":\"2020-3-2T00:00:00-05:00\" }" + "]" + "}"; // Create an object obj1row obj1 = new obj1row { Name = "name1", Address = "address1" }; obj2row obj2 = new obj2row { Image = 32, Url = "url1" }; obj3row obj3 = new obj3row { Type="", Created = new DateTimeOffset(new DateTime(2020, 3, 2, 13, 32, 00), new TimeSpan(-5, 0, 0)) }; List<Contentrow> list = new List<Contentrow>(); list.Add(obj1); list.Add(obj2); list.Add(obj3); Result result1 = new Result(); result1.name = "Joe"; result1.inputrows = list; //Settings for JsonConvert var settings = new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All }; // convert object to json string s = JsonConvert.SerializeObject(result1, Formatting.Indented, settings); // convert json to object Result result2 =(Result) JsonConvert.DeserializeObject<Result>(myObj, settings); Console.WriteLine(s); Console.WriteLine(result2.ToString()); Console.ReadKey(); } } public class Result { public string name { get; set; } public List<Contentrow> inputrows { get; set; } //Printing stuff, not important public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("{name: " + name + ","); sb.Append("inputrows: ["); foreach (Contentrow row in inputrows) { sb.Append(row.ToString()); } sb.Append("]}"); return sb.ToString(); } } public class Contentrow { } public class obj1row : Contentrow { public string Name { get; set; } public string Address { get; set; } public override string ToString() { return "{ Name: " + Name + ", Address: " + Address + "}"; } } public class obj2row : Contentrow { public int? Image { get; set; } public string Url { get; set; } public override string ToString() { return "{ Image: " + Image + ", Url: " + Url + "}"; } } public class obj3row : Contentrow { public string Type { get; set; } public DateTimeOffset Created { get; set; } public override string ToString() { return "{ Type: " + Type + ", Created: " + Created + "}"; } } }Demo:
Hope this can help you.
Best regards,
Sean
Member
1 Points
6 Posts
Re: C# deserialize JSON array
Mar 02, 2020 02:36 PM|chanlo|LINK
Thank you so much Sean, i will look at it and learn :D
Participant
1110 Points
299 Posts
Re: C# deserialize JSON array
Mar 03, 2020 11:26 AM|Sean Fang|LINK
Hi, chanlo,
I would be glad if it could help you.
If you still meet problems, you can post it here and people here will be happy to solve the problem.
If you find that the answer does solve your issues, I suggest you could mark the answer which is right and helpful. This will help other people who faces the same issue to find the right answer more faster.
Best regards,
Sean