How to read data from a text file into a collection? (JSON preferred)

Well, I do it using FileStream. I first save the length of the array and then do a for loop to save the data.

Here is an example of saving an array on integers in C#

using System.IO;

public class SomeClass
{
	FileStream file;
	
	public void SaveArray(int[] arr)
	{
		file = File.open("myfile.format", FileMode.OpenOrCreate);
		
		byte[] arraySize = System.BitConverter.GetBytes(arr.Length);
		file.Write(arraySize, 0, sizeof(int));
		
		for(int i = 0; i < arr.Length; i++)
		{
			byte[] arrayElement = System.BitConverter.GetBytes(arr*);*

  		file.Write(arrayElement, 0, sizeof(int));*

```
  	}*
```
```
  	file.Close();*
```
```
  }*
```
```
  public void LoadArray(int[] arr)*
```
```
  {*
```

  	if (file = File.Open("myfile.format", FileMode.Open))*

```
  	{*
```

  		byte[] arraySize = new byte[sizeof(int)];*

  		file.Read(arraySize, 0, sizeof(int));*

```
  		arr = new int[arraySize];*
```

  		for (int i = 0; i < arraySize; i++)*

```
  		{*
```

  			byte[] arrayElement = new byte[sizeof(int)];*

  			file.Read(arrayElement, 0, sizeof(int));*

_ arr = System.BitConverter.ToInt32(arrayElement);_
* }*

* file.Close();*
* }*
* }*
* }*
*_ _*You need to remember, when saving, things come out in the exact same way they go in.*_ _*So since you are doing an array of 2D coordinates. That means in the loop, you would do 2 writes and 2 reads instead of one. One for each float in the coordinate.*_ _*
for(int i = 0; i < arr.Length; i++)
{
byte[] arrayElement = System.BitConverter.GetBytes(arr*.x);*
file.Write(arrayElement, 0, sizeof(int));
arrayElement = System.BitConverter.GetBytes(arr*.y);*
file.Write(arrayElement, 0, sizeof(int));
}
`
The same principles should apply with whatever format you choose to use. You just need to find out how the co-ordinates are stored in the file so you know what datatypes to pull out the data as.

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