CODEWITHSUNDEEP
c#.net-coreentity-framework-core
Franva
Franva

Reputation: 7067

.net core C# use dynamic property name on EF Core Database first generated model class

I have a user details class

public partial class UserDetails
    {
        public int? Level { get; set; }
        public string Unit { get; set; }
        public string Bio { get; set; }
        public bool? Gender { get; set; }
        public int? Mobile { get; set; }
        public string Photo { get; set; }
    }

I am writing an update method:

public bool UpdateDetails(string userId, UserProperties updateProperty, string value)
        {
         switch(updateProperty)
            {
                case UserProperties.Unit:
                    details.Unit = value;
                    break;
                case UserProperties.Photo:
                    details.Photo = value;
                    break;
                default:
                    throw new Exception("Unknown User Detail property");
            }

May I do something like dynamic property in JavaScript? e.g. 

var details = new UserDetails();
details["Unit"] = value;

Update

As of year 2019! How about try to use this new feature?! DynamicObject DynamicObject.TrySetMember(SetMemberBinder, Object) Method

I am trying to figure out how to write it.

Upvotes: 2

Views: 3832

Answers (3)

just-my-name
just-my-name

Reputation: 565

If you don't want to use reflection you can slightly tweak Alens solution to use dictionary to store data.

public class UserDetails
{
    private Dictionary<string, object> Items { get; } = new Dictionary<string, object>();

    public object this[string propertyName]
    {
        get => Items.TryGetValue(propertyName, out object obj) ? obj : null;
        set => Items[propertyName] = value;
    }

    public int? Level
    {
        get => (int?)this["Level"];
        set => this["Level"] = value;
    }
}

Upvotes: 3

Metheny
Metheny

Reputation: 1192

The closest thing would be the ExpandoObject:

https://learn.microsoft.com/en-us/dotnet/api/system.dynamic.expandoobject?view=netframework-4.8

For example:

dynamic sampleObject = new ExpandoObject();
sampleObject.test = "Dynamic Property";
Console.WriteLine(sampleObject.test);

Upvotes: 0

Alen Genzić
Alen Genzić

Reputation: 1418

You can do it via reflection for properties that exist on the object.

C# has a feature called Indexers. You could extend your code like this to allow for the behavior you are expecting.

 public partial class UserDetails
    {
        public int? Level { get; set; }
        public string Unit { get; set; }
        public string Bio { get; set; }
        public bool? Gender { get; set; }
        public int? Mobile { get; set; }
        public string Photo { get; set; }
         // Define the indexer to allow client code to use [] notation.
       public object this[string propertyName]
       {
          get { 
            PropertyInfo prop = this.GetType().GetProperty(propertyName);
            return prop.GetValue(this); 
          }
          set { 
            PropertyInfo prop = this.GetType().GetProperty(propertyName);
            prop.SetValue(this, value); 
          }
       }
    }

Other than that, if you don't know the properties at runtime, you can use the dynamic type.

Upvotes: 5

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