Predicate Conditions for Find, First...Methods

[share_holder]

Hi there, I´m trying to understand how Methods with Predicate and Conditions work; it´s a little confusing for me. For example, we have a 10-positions array of bytes, such as

public byte[] Client_ID_List { get; private set; }

, it´s initialized by:

Client_ID_List = new byte[8];

After a while, I want to find the first position in this array that has '0' value. I have seen that First method returns the first element that satisfies a condition, but I don´t really understand how Predicate argument works. Any help or simple example will be very useful. Or maybe any other idea to solve this issue. Kind Regards, D.

[Wayne Gaylard]

A predicate is just a method that returns a boolean value. Thus to use a predicate in a .First query, you can either use a Lambda expression

byte FirstZeroByte()
{
return ClientIdList.First((b) => b == 0);
}

or pass a method to the query that returns a boolean

bool IsZeroByte(byte byteToCheck)
{
if (byteToCheck == 0)
return true;
return false;
}

    byte FirstZeroByte()
    {
        return ClientIdList.First(IsZeroByte);
    }

Hope this helps

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