Display only selected properties from the class

March 3, 2023

Assume, I like to display only name and quantity from the class (not "price"). How to set visible property for these fields in the ItemPoints.cs, which I could make use of in razor page to display only these two properties.

Below is my class:

ItemPoints.cs

public class ItemPoints : Points 
{        
    [JsonPropertyName("nme")]
    public double Name { get; set; }

    [JsonPropertyName("Prc")]
    public double Price { get; set; }
  
    [JsonPropertyName("qty")]
    public double Quantity{ get; set; }    
 }

Razor page that displays these properties:

Item.Razor

   var type = typeof(ItemPoints); // I could pass different types here
   foreach (var item in type.GetProperties().Where(w => w.PropertyType == typeof(double)))
   {
         .......
   }

As you could see var type = typeof(ItemPoints), I could pass different types here. So do not want to hardcode class name and property name in razor page. Thank you.

>Solution :

I suggest to use a custom attribute to mark properties that you doesn’t want to display. Something like this.

public class HiddenAttribute : Attribute { }

public class ItemPoints : Points   {
    [JsonPropertyName("nme")]
    public double Name { get; set; }

    [Hidden]
    [JsonPropertyName("Prc")]
    public double Price { get; set; }

    [JsonPropertyName("qty")]
    public double Quantity { get; set; }
}

And then exclude hidden properties from the foreach:

foreach (var item in type
              .GetProperties()
              .Where(w => 
                   w.PropertyType == typeof(double) && 
                   w.GetCustomAttribute<HiddenAttribute>() == null)) {

    // ...
}