Given a JSON file people.json containing an array of Person objects, which code snippet correctly reads and deserializes it into a List<Person> in C#?
hard🚀 Application Q8 of Q15
C Sharp (C#) - File IO
Given a JSON file people.json containing an array of Person objects, which code snippet correctly reads and deserializes it into a List<Person> in C#?
Astring json = File.ReadAllText("people.json");
var people = JsonSerializer.Deserialize<List<Person>>(json);
Bvar people = JsonSerializer.Deserialize<Person[]>(File.ReadAllText("people.json"));
Cvar people = JsonSerializer.Deserialize<Person>(File.ReadAllText("people.json"));
Dvar people = JsonSerializer.Serialize<List<Person>>(File.ReadAllText("people.json"));
Step-by-Step Solution
Solution:
Step 1: Read the JSON file content as a string
Use File.ReadAllText to get the JSON text.
Step 2: Deserialize into a List<Person>
Use JsonSerializer.Deserialize<List<Person>>(json) to convert JSON array into a list of Person objects.
Step 3: Analyze other options
var people = JsonSerializer.Deserialize(File.ReadAllText("people.json")); deserializes into an array, which is valid but not a List. var people = JsonSerializer.Deserialize(File.ReadAllText("people.json")); tries to deserialize into a single Person object, which is incorrect for an array JSON. var people = JsonSerializer.Serialize>(File.ReadAllText("people.json")); incorrectly uses Serialize instead of Deserialize.
Final Answer:
string json = File.ReadAllText("people.json");
var people = JsonSerializer.Deserialize<List<Person>>(json); -> Option A
Quick Check:
Read file as string, then deserialize to List [OK]
Quick Trick:Read file text first, then deserialize to List [OK]
Common Mistakes:
MISTAKES
Deserializing directly to a single object instead of a collection
Using Serialize instead of Deserialize
Deserializing to array when List is required without conversion
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