I have spent the best part of two days "faffing" about with code samples and etc., trying to read a very large JSON file into an array in c# so I can later split it up into a 2d array for processing.
The problem I was having was I could not find any examples of people doing what I was trying to do. This meant I was just editing code a little an hoping for the best.
I have managed to get something working that will:
This was done with the code below but it crashes the program after entering a few lines into the array. This might have to do with the file size.
// If the file extension was a jave file the following
// load method will be use else it will move on to the
// next else if statement
if (fileExtension == ".json")
{
int count = 0;
int count2 = 0;
int inOrOut = 0;
int nRecords=1;
JsonTextReader reader = new JsonTextReader(new StreamReader(txtLoaction.Text));
string[] rawData = new string[5];
while (reader.Read())
{
if (reader.Value != null)
if (inOrOut == 1)
{
if (count == 6)
{
nRecords++;
Array.Resize(ref rawData, nRecords);
//textBox1.Text += "\r\n";
count = 0;
}
rawData[count2] += reader.Value + ","; //+"\r\n"
inOrOut = 0;
count++;
if (count2 == 500)
{
MessageBox.Show(rawData[499]);
}
}
else
{
inOrOut = 1;
}
}
}
A snippet of the JSON I am working with is:
[
{ "millis": "1000",
"stamp": "1273010254",
"datetime": "2010/5/4 21:57:34",
"light": "333",
"temp": "78.32",
"vcc": "3.54" },
]
I need the values out of this JSON. For example, I need "3.54", but I would not want it to print the "vcc".
I am hoping someone can show me how to read a JSON file in and only extract the data that I need and put it into an array or something that I can use to later put into an array.
How about making everything easier with Json.NET?
public void LoadJson()
{
using (StreamReader r = new StreamReader("file.json"))
{
string json = r.ReadToEnd();
List<Item> items = JsonConvert.DeserializeObject<List<Item>>(json);
}
}
public class Item
{
public int millis;
public string stamp;
public DateTime datetime;
public string light;
public float temp;
public float vcc;
}
You can even get the values dynamically
without declaring Item
class.
dynamic array = JsonConvert.DeserializeObject(json);
foreach(var item in array)
{
Console.WriteLine("{0} {1}", item.temp, item.vcc);
}