CODEWITHSUNDEEP
c#-4.0lambda
Goran
Goran

Reputation: 77

Where predicate and Expression<Func<T, bool>>

I have this line of code that returns index of particular object in a IList<T>

int index = list.IndexOf(list.Where(x => x.Code == searchValue).FirstOrDefault());

and I have similar construction on many places, which searches collections on different properties. My goal is to automate this, so I can have a generic method MyClass<T>

int index = myClass.Find<T>(x=> x.Code == searchValue);

or

int index = MyClass.Find<T>(x => x.Name.ToUpper().StartsWith(searchValue.ToUpper()));

Is this possible with Lambda expressions?

Edit:

For anyone that is asking the same, here is the code that is working:

public int Find(Func<T, bool> whereClause)
{
    return _list.IndexOf(_list.Where<T>(whereClause).FirstOrDefault<T>());
}

Upvotes: 1

Views: 1550

Answers (1)

Jon Skeet
Jon Skeet

Reputation: 1502786

I'm not sure why you think you need to use an expression tree. Assuming list is a List<T>, you should be able to use FindIndex:

int index = list.FindIndex(x => x.Code == searchValue);

If that's not what you need, please give us more information about what the types involved are.

Upvotes: 2

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