.Net, C#, Coding, Visual Studio

Using Predicate delegate

Have you ever try to find an element in the List or Array.   I’ve done it many times.  However, every time I have to look for an element inside a List I don’t remember how to do it and I have to either Google or search my own code.

This time I have to FindLast element in my List and I don’t remember how to do that.  So I decided to put it here so next time I know where to find an example.

[Test]
public void PredicateExample()
{
    List<string> myLst = new List<string>(
        new string[] { "elem1", "elem2", "elem3" });
    string elem = myLst.Find(delegate(string elemInSearch) 
        { return elemInSearch == "elem2"; });
    Assert.AreEqual("elem2", elem);
}

You also can create predicate delegate as separate method:

[Test]
public void AnotherPredicateExample()
{
    List<string> myLst = new List<string>(
        new string[] { "elem1", "elem2", "elem3" });
    string elem = myLst.Find(FindElement("elem2"));
    Assert.AreEqual("elem2", elem);
}
 
private Predicate<string> FindElement(string elem)
{
    return delegate(string listElem)
       {
           return listElem.Equals(elem);
       };
}

I hope it helps you.  It definitely is going to help me.

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One thought on “Using Predicate delegate

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