C# Lambda : using Event<T>()

Question

I have an ArrayList of FrameworkElements in variable "selectedElementArray"

and the below code is used to align controls to top

    double top = 100;
    selectedElementArray.Cast<FrameworkElement>()
        .ToList()
        .ForEach(fe => Canvas.SetTop(fe, top));

this is working fine.

but i need to avoid a FrameworkElement, say parentElement, which exists in "selectedElementArray"

selectedElementArray.Cast<FrameworkElement>()
       .ToList()
       .Except(parentElement)
       .ToList()
       .ForEach(fe => Canvas.SetTop(fe, top));

i tried using "Except". but throwing some exception.

pls help....

Binil

what kind of exception? are you sure parentElement in the selectedElement array? — Arsen Mkrtchyan
– Arsen Mkrtchyan, Commented Dec 23, 2010 at 6:03
What exception? The exception will give you help. The Except method expects an IEnumerable<object>, not a single object - that would give you a compile time error. — Kirk Broadhurst
– Kirk Broadhurst, Commented Dec 23, 2010 at 6:04
@Kirk, the Exception is The type arguments for method 'System.Linq.Enumerable.Except<TSource>(System.Collections.Generic.IEnumerable<TSource>, System.Collections.Generic.IEnumerable<TSource>)' cannot be inferred from the usage. Try specifying the type arguments explicitly. — Binil
– Binil, Commented Dec 23, 2010 at 6:09
binil: That's a compiler error, not an exception. Exceptions only happen when your code is actually running. — Gabe
– Gabe, Commented Dec 23, 2010 at 6:12

decyclone · Accepted Answer · 2010-12-23 06:10:39Z

3

You just need a where clause.

selectedElementArray.Cast<FrameworkElement>()
   .Where(element => element != parentElement)
   .ToList()
   .ForEach(fe => Canvas.SetTop(fe, top));

To use except, you need to pass an IEnumerable:

selectedElementArray.Cast<FrameworkElement>()
   .Except(new FrameworkElement[]{ parentElement })
   .ToList()
   .ForEach(fe => Canvas.SetTop(fe, top));

answered Dec 23, 2010 at 6:10

decyclone

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Gabe · Accepted Answer · 2010-12-23 06:09:10Z

3

Maybe you want something like this?

selectedElementArray.Cast<FrameworkElement>()
       .Where(fe => fe != parentElement)
       .ToList()
       .ForEach(fe => Canvas.SetTop(fe, top));

Or maybe:

foreach (var fe in selectedElementArray.Cast<FrameworkElement>()
                                       .Where(fe => fe != parentElement))
    Canvas.SetTop(fe, top);

answered Dec 23, 2010 at 6:09

Gabe

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