CODEWITHSUNDEEP
c#linq
NoviceToDotNet
NoviceToDotNet

Reputation: 10805

can i make a this linq statement iteration from a collection in a single statement?

bool isExist = objCustomization.CustomSettings.Where(p => p.CustomizationType == selCustomizationType && p.CategoryID == selCategoryID).Any();

if (isExist)
{
    chkFixLimit.Checked = objCustomization.CustomSettings.Where(p => p.CustomizationType == selCustomizationType && p.CategoryID == selCategoryID).FirstOrDefault().IsDefaultLimit;
}
else chkFixLimit.Checked = false;

Upvotes: 2

Views: 74

Answers (5)

cuongle
cuongle

Reputation: 75306

This not in one line but it is more readable, you can change:

var setting = objCustomization.CustomSettings              
                .FirstOrDefault(p => p.CustomizationType == selCustomizationType 
                                  && p.CategoryID == selCategoryID);

chkFixLimit.Checked = setting == null ? false : setting.IsDefaultLimit;

Upvotes: 2

the_joric
the_joric

Reputation: 12226

chkFixLimit.Checked = objCustomization.CustomSettings
  .Where(p => p.CustomizationType == selCustomizationType 
     && p.CategoryID == selCategoryID)
  .Select(c => c.IsDefaultLimit)
  .FirstOrDefault();

Upvotes: 2

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236218

Default value for boolean is false so you even don't need any conditions - just select first or default IsDefaultLimit value:

chkFixLimit.Checked =
   objCustomization.CustomSettings
       .Where(p => p.CustomizationType == selCustomizationType && p.CategoryID == selCategoryID)
       .Select(p => p.IsDefaultLimit)
       .FirstOrDefault();

UPDATE (answer for your comment) in case you have non-boolean value or default value (zero for integer) do not fit your requirements, with DefaultIfEmpty you can provide own default value if there is no items matching your condition:

maxCountCmb.SelectedIndex = 
    objCustomization.CustomSettings
        .Where(p => p.CustomizationType == selCustomizationType && p.CategoryID == selCategoryID)
        .Select(p => p.DefaultFreeCount)
        .DefaultIfEmpty(-1)
        .First();

Upvotes: 5

MarcinJuraszek
MarcinJuraszek

Reputation: 125630

Sure you can:

var item = objCustomization.CustomSettings.FirstOrDefault(p => p.CustomizationType == selCustomizationType && p.CategoryID == selCategoryID);

chkFixLimit.Checked = item != null && item.IsDefaultLimit;

Or single statement, as you wish:

chkFixLimit.Checked = new Func<bool>(() => {
    var item = objCustomization.CustomSettings.FirstOrDefault(p => p.CustomizationType == selCustomizationType && p.CategoryID == selCategoryID);
    return item != null && item.IsDefaultLimit;
}).Invoke();

Upvotes: 3

SWeko
SWeko

Reputation: 30892

That code is more-or-less the use case of the FirstOrDefault method. If something exists, return the first such item, and return a default value (null for reference types) if it doesn't. So you could just do:

var item = objCustomization.CustomSettings.FirstOrDefault
               (p => p.CustomizationType == selCustomizationType && p.CategoryID)

and as result, the item object will either be null (assuming you indeed work with a reference type), or it will have a value.
After that you can just check that, with a simple

chkFixLimit.Checked = (item == null) ? false : item.IsDefaultLimit;

Upvotes: 1

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