C# Lambda-Select with conditions

Question

I created a Command-class which has two important members.

public class Command
{
    public string Name { get; set; }
    public CommandExecutedCallback Callback { get; set; }
    public delegate void CommandExecutedCallback(Command command);
}

I save multiple objects of this class in a List<Command>.

Another class CommandProcessor has a member function GetCallbacks(string name).

I want to use a lambda expression to get an array of CommandExecutedCallback-delegates with the condition that the name matches.

I can get all Callbacks with: return commandList.Select(t => t.Callback).ToArray().

How can i insert the condition to get only commands with the specified name?

Thank you in advance.

Answer 1

You need to a add a Where condition:

return commandList.Where(t => t.Name == name).Select(t => t.Callback);

You should also avoid calling ToArray unless you really need to. Unless you're specifically passing this data to some other method that requires an array, copying all of the data with ToArray is probably an unnecessary (and rather expensive) operation.

Answer 2

Is this what you mean?

return commandList
    .Where(t => t.Name == "someName")
    .Select(t => t.Callback)
    .ToArray();