I'm trying to deserialize a nested json-file that looks like the following sample: The output i want is "flat" table. I'm using .net 4.0 and I do not have the option of using third-party librabies like json.net.
{
"responsetime": 33,
"products": {
"totalProducts": 25,
"products": [
{
"id": 1,
"name": "Bike One",
"colors": [
{
"colorId": 44,
"name": "green",
"chemicals": [
{
"chemicalId": 99,
"chemicalName": "abc"
},
{
"chemicalId": 45,
"chemicalName": "bcd"
}
]
},
{
"colorId": 42,
"name": "blue",
"chemicals": [
{
"chemicalId": 96,
"chemicalName": "def"
},
{
"chemicalId": 22,
"chemicalName": "lkj"
}
]
}
]
}
]
}
}
From this I have genereated the following classes:
public class ResponseObject
{
public int responsetime { get; set; }
public Products products { get; set; }
}
public class Products
{
public int totalProducts { get; set; }
public Product[] products { get; set; }
}
public class Product
{
public int id { get; set; }
public string name { get; set; }
public Color[] colors { get; set; }
}
public class Color
{
public int colorId { get; set; }
public string name { get; set; }
public Chemical[] chemicals { get; set; }
}
public class Chemical
{
public int chemicalId { get; set; }
public string chemicalName { get; set; }
}
The output i want is a flat structure like the following:
1 Bike One 44 green 99 abc
1 Bike One 44 green 45 bcd
1 Bike One 42 blue 96 def
1 Bike One 42 blue 22 lkj
I am able to obtain this with the following code, however this implies 3 foreach-loops which i'm afraid will give bad performance if there are ie 100.000 products with N colors and N chemicals each. Is there any other way to flatten this that will perform better using "vanilla" .net?
String jsonFileContent = File.ReadAllText(@"C:\example.json");
JavaScriptSerializer js = new JavaScriptSerializer();
js.MaxJsonLength = Int32.MaxValue;
ResponseObject rspns = js.Deserialize<ResponseObject>(jsonFileContent);
foreach (var product in rspns.products.products)
{
foreach (var color in product.colors)
{
foreach (var chemical in color.chemicals)
{
Console.WriteLine(product.id);
Console.WriteLine(product.name);
Console.WriteLine(color.colorId);
Console.WriteLine(color.name);
Console.WriteLine(chemical.chemicalId);
Console.WriteLine(chemical.chemicalName);
}
}
}
You want to start having the ToString
done by the same objects:
public class Products
{
public int totalProducts { get; set; }
public Product[] products { get; set; }
public override string ToString(){
// this iterates all products and stacks their string representation
var productsStrings = products.Select(x => x.ToString());
return productsStrings.Aggregate("", (a, n) => a + n + "\n").trimEnd();
}
}
public class Product
{
public int id { get; set; }
public string name { get; set; }
public Color[] colors { get; set; }
public override string ToString(){
// this gets all color strings and prepends the product string
// "1 Bike" + product (repeated CO times)
var colorSubstrings = colors.Select(x => x.GetSubstrings());
var appendOnStrings = colorSubstrings.Select(x => $"{id} {name} {x}");
return appendOnStrings.Aggregate("", (a, n) => a + n + "\n").trimEnd();
}
}
public class Color
{
public int colorId { get; set; }
public string name { get; set; }
public Chemical[] chemicals { get; set; }
public string[] GetSubstrings(){
// this gets all chemicals strings and prepends the color string
// "44 green" + chemicalString (repeated CH times)
return chemicals.Aggregate("", (a, chemical) => a + $"{colorId} {name} {chemical.ToString()} \n").trimEnd();
}
}
public class Chemical
{
public int chemicalId { get; set; }
public string chemicalName { get; set; }
public override string ToString(){
// this produces a string like -> "99 abc"
return $"{chemicalId} {chemicalName}";
}
}
Then you just parse the whole chain and call it:
String jsonFileContent = File.ReadAllText(@"C:\example.json");
JavaScriptSerializer js = new JavaScriptSerializer();
js.MaxJsonLength = Int32.MaxValue;
// deserializing JSON to rspns
ResponseObject rspns = js.Deserialize<ResponseObject>(jsonFileContent);
// result will contain the table with all products, colors and chemicals
var result = rspns.products.ToString();
// printing only once will surely improve the performances
Console.WriteLine(result);
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