How to assign a same value to different properties using Object Initializer

Question

I try to assign a value to two different properties in object initializer and failed.

In below code i try to assign Expand and Select properies to true. But i got the error 'The name Select doesnt exist in the current context'

Here is my code

public class MyClass{
public String Title{get;set;}
public String Key{get;set;}
public bool Expand{get;set;}
public bool Select{get;set;}
public bool Editable{get;set;}
}

new MyClass()
  {
   Title = "Murali",
   Key = "MM",                       
   Expand = Select = true
  }

Also i need to assign another property Editable based on this two properties

Something like

new MyClass()
  {
   Ediatable=(Select && Expand)
  }

How can i do the above logic? Does Object Initializer has a support of it?

is noting to worry about, is noting at all.

Freeman
– Freeman

2013-01-23 12:45:44 +00:00
Commented Jan 23, 2013 at 12:45 — Freeman
– Freeman, Commented Jan 23, 2013 at 12:45

dtb · Accepted Answer · 2013-01-23 12:46:38Z

2

You cannot refer to properties of the object you're constructing on the right-hand side of a =, i.e., you can only assign to the properties, but not read from them.

Possible solution:

var expandAndSelect = true;

var result = new MyClass
{
    Title = "Murali",
    Key = "MM",                       
    Expand = expandAndSelect,
    Select = expandAndSelect,
};

and

var select = true;
var expand = false;

var result = new MyClass
{
    Expand = expand,
    Select = select,
    Editable = select & expand,
};

answered Jan 23, 2013 at 12:46

dtb

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5 Comments

Murali Murugesan Over a year ago

Ok. But i was doing this in normal object construction before. Like MyClass obj=new MyClass(); obj.select=true; obj.edit=obj.select; I dont know why it is not there in Object Initializer :(

dtb Over a year ago

Object initializer syntax does not support this. If you want to do this, don't use object initializer syntax.

Murali Murugesan Over a year ago

The another important fact is i was calling another collection.Contains(key) to get bool value for it. In this case it calls 2 more times :(

Jeppe Stig Nielsen Over a year ago

@Murali Just out of curiosity, why do you change from "normal object construction" to object initializer? One possibility is to use normal property assignment on a temp. variable, and then copy the reference from the temp. variable to the "permanent" variable once every propety assignment has succeeded. That's more or less what object initializers do.

Murali Murugesan Over a year ago

@JeppeStigNielsen, i started using object initializer with lambda expression, something like collection.select(x=> new MyClass{...}). Now only getting new changes and more properties.

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