Im building a Web-Api. How do I use the Options pattern to bind a json string value from my appsettings.json. The value in my appsettigs.json file is an escaped json string as shown below (this has to be a json string).
The formatted Json that is saved as a string in my appsettings.json file looks like this
[
{
"Item": "Bread",
"Code": "Br"
},
{
"Item": "Milk",
"Code": "Mk"
}
]
My appsettings.json file with escaped json string
{
"MappingCodes": {
"SystemOne": "[{\"Item\":\"Bread\",\"Code\":\"Br\"},{\"Item\":\"Milk\",\"Code\":\"Mk\"}]"
}
}
I have a MappingCode.cs class (to bind the json string) and a Product.cs class (to represent json string value)
public class MappingCode
{
public string SystemOne{ get; set; }
}
public class Product
{
public string Item{ get; set; }
public string Code{ get; set; }
}
How do i inject a collection of the Product class from the StartUp class so im able to use it something like this
public class MyClass
{
public MyClass(IOptions<IList<Product>> products){
{
var prods = products.Value;
}
}
CodePudding user response：
add this code to your startup (or program if you use)
services.Configure<MappingCode>(configuration
.GetSection("MappingCodes"));
services.AddScoped<MyClass>();
and code
public class MyClass
{
private readonly List<Product> _products;
public MyClass(IOptions<MappingCode> mappingCode)
{
_products = JsonConvert.DeserializeObject<List<Product>>(mappingCode.Value.SystemOne);
}
}
if you turn escape string into string in appsettings, you will not need to deserialize, so I recommend
"MappingCodes":{"SystemOne":[{"Item":"Bread","Code":"Br"},{"Item":"Milk","Code":"Mk"}]}
CodePudding user response：
I had written a detail article on same topic some time back.
have a look. hope it will be useful