CODEWITHSUNDEEP
c#class
pedrodbsa
pedrodbsa

Reputation: 1431

Property Type from variable

consider the following class:

public class ShortName
{
    public string ValueString { get; set; }

    private Type ValueType { get; }

    public typeof(ValueType) Value
    {
        get
        {
            //do stuff
        }
    }
}

This isn't possible as typeof(ValueType) isn't recognized. Can anyone help me define the "Value" property type as the type returned by ValueType?

thanks

Upvotes: 2

Views: 2294

Answers (4)

Victor Haydin
Victor Haydin

Reputation: 3548

public class ShortName<T>
{
    public string ValueString 
    { 
        get 
        {
            return Value.ToString(); // be aware of null ref here!
        }
    }
    private Type ValueType 
    { 
        get 
        {
            return typeof(T);
        }
    }

    public T Value
    {
        get; set;
    }
}

Upvotes: 1

Charles Bretana
Charles Bretana

Reputation: 146409

It might be possible using generics. Try:

public class ShortName<T>
{     
     public string ValueString { get; set; }      
     private Type ValueType { get; }      
     public T Value<T>  
     { 
         get {  return /*Something cast to a T */ ; }     
     }
}

Upvotes: 1

decyclone
decyclone

Reputation: 30810

Not sure what you want but:

public Type Value
{
    get
    {
        return ValueType.GetType();
    }
}

Since typeof(<anything>) will return Type.

If this is not what you want, look into using Generics.

Upvotes: 1

SLaks
SLaks

Reputation: 887195

This is completely impossible.
If you think carefully about it, it doesn't make any sense in the first place.

Properties must have compile-time types; you're trying to define a property whose type is only known at runtime.
How would you be able to use the property?

Instead, you can either make an object property or use generics.

Upvotes: 1

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