Iterating and creating new anonymous types dynamically

Question

I have an anonymous type of this form:

new List<MyList>()
{
   new Column { Name = "blah", Width = 100, Hidden = true },
   new Column { Name = "blah1", Width = 60, Hidden = false }
}

How can I go about creating the content within the list dynamically, like:

new List<MyList>()
{
    foreach (var columns in col) 
    {
       new Column { Name = columns.Name ... }
    }
}

Even with col returning the right sort of data, the above example isn't acceptable and I can't see why.

AustinWBryan · Accepted Answer · 2018-10-14 05:09:53Z

7

You try to loop over the collection inside the object initializer block (thx to Luke).

Try creating the list first and than filling it,

var list = new List<MyList>();

foreach (var columns in col) 
{
    list.Add(new Column { Name = columns.Name ... });
}

edited Oct 14, 2018 at 5:09

AustinWBryan

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answered Dec 15, 2009 at 21:34

Oliver Friedrich

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1 Comment

LukeH Over a year ago

+1, but with a small nitpick: The code in the question isn't looping "inside the list constructor", it's looping inside an object initializer block. msdn.microsoft.com/en-us/library/bb384062.aspx

Dave Markle · Accepted Answer · 2009-12-15 21:34:04Z

2

Not sure exactly what you're asking, but have you tried something of the form:

col.Select(c => new Column {Name = c.Name ... etc}).ToList();

answered Dec 15, 2009 at 21:34

Dave Markle

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1 Comment

Dolphin Over a year ago

I thought this was what the poster was asking at first, but I think BeowulfOFs answer may be what Rio is looking for.

John Boker · Accepted Answer · 2009-12-15 21:33:38Z

1

maybe something like

var theList = new List<MyList>();
col.ForEach(c=> theList.Add( new Column(){ Name=c.Name ... etc } ));

answered Dec 15, 2009 at 21:33

John Boker

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