What am I doing wrong when trying to deserialize json into a c# list?-CodePudding

I have a Product class:

class Product 
    {
        public string Name;
    }

A Product List class:

   class ProductDataFile
    {
        public List<Product>? products;

    }

And a class for loading json into these classes:

public void LoadProducts()
 {
   string jsonString = File.ReadAllText(FileLoc);
   ProductDataFile? productDataFile= JsonSerializer.Deserialize<ProductDataFile>(jsonString);
   var ProductName = productDataFile.products.First().Name;
 }

This throws a "System.ArgumentNullException: Value cannot be null. (Parameter 'source')". I used the debugger and products is null, so that seems to be the problem.

My Json looks something like this:

{
  "listOfProducts": "List of products",
  "products": [
    {
      "Name": "product one"
    }
  ]
}
```

CodePudding user response：

The library Newtonsoft.json method of JsonSerializer.Deserialize need to use properties instead of fields, otherwise you might not Deserialize anything from your JSON data.

class Product 
{
    public string Name {get;set;}
}

class ProductDataFile
{
    public List<Product>? products {get;set;}

}

I would suggest you use json2csharp, it can easy to get the model by JSON and make sure it will be work.