Validate object properties

Ronald Rex 101

I have objects that I am adding to a list of Interface items. My properties on my objects are strings. I was wondeing how do I make sure that my properties have values? Thanks !!!

public class Pizza 
{
   public string pizzaSize {get;set;}
   public string pizzaType {get;set;}
   public string sauceType {get;set;}
}

public static List<IMenuItem> items=new List<IMenuItem>();

AgaveJoe 29,281

I'm pretty sure there is more to your question. My best guess is you want a default value?


    public class Pizza
    {
        public string pizzaSize { get; set; } = String.Empty;
        public string pizzaType { get; set; } = String.Empty;
        public string sauceType { get; set; } = String.Empty;
    }

Ronald Rex 101 Reputation points

2023-01-12T23:14:53.6933333+00:00

Thanks. Sorry I guess I should have added what my final objective is, which is to inform the user that they didnt select a value from one of the properties which are connected to check boxes. Thanks Again !!! Oh, why did you assign a string.empty to the properties?
AgaveJoe 29,281 Reputation points

2023-01-13T00:52:14.9133333+00:00

Oh, why did you assign a string.empty to the properties?

I simply guessed you wanted default properties.

Sorry I guess I should have added what my final objective is, which is to inform the user that they didnt select a value from one of the properties which are connected to check boxes.

If the user is required to submit the three properties (Model Validation) then decorate the inputs with the [Required] attribute.

Reference documentation:

Model validation in ASP.NET Core MVC and Razor Pages
Ronald Rex 101 Reputation points

2023-01-13T14:06:22.53+00:00

Thanks for your help, but this is not MVC application.
AgaveJoe 29,281 Reputation points

2023-01-13T15:55:00.1433333+00:00

It is much easier to help if you are specific. Posting the application is not MVC does not tell us what kind of application you are building.

The [Required] attribute also applies to EF Core, Razor Pages, and Web API. Keep in mind you tagged this question as ASP.NET so I assume you are building an ASP.NET application.
Ronald Rex 101 Reputation points

2023-01-13T16:15:50.8433333+00:00

Sorry, its a .Net Maui app. I just want to know what is the best practice for checking the values of properties on a class. Thanks !!!
AgaveJoe 29,281 Reputation points

2023-01-13T19:04:05.2433333+00:00
Sorry, its a .Net Maui app. I just want to know what is the best practice for checking the values of properties on a class.

There's no magic. Check the value using standard C# syntax and operators. How you go about validating a property depends on how the code is intended to function also known as a "use case" which you still have not explained clearly.

static void Main() { Pizza p = new Pizza(); string size = p.pizzaSize ?? "Size is empty"; Console.WriteLine(size); }

The code above displays "Size is empty" in the console. I'm using the C# coalesce operator. There are other method like an "if" or the ternary conditional operator. The approach you decide on depends on the situation.

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Validate object properties

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