C#•6mo ago

Delegates

Learn delegates and I can't find any information about the following thing: 1. Why when we declare an instance of delegate with its name in class we can't provide it with one more method outside of its declaration? But it works in method as we can see, 2. Why we CAN add method in an instance of delegate during its declaration? Screenshot and code itself I want to completely understand why it is so

7 Replies

SplikZerysOP•6mo ago

c#
using System.Net.Mime;

namespace ConsoleApp18;
class Program
{
    static void Main(string[] args)
    {
        // 3
        // Now we declare in method

        Print print;
        print = Text;
        print += CountSymbols;
        
        // But here it works well
    }

    // 1
    // During declaring the first variable we can add method
    // But when trying to add one more it's now working at all
    // With 'Cannot resolve symbol 'print' or 'CountSymbols''
    public static Print print = Text;
    print += CountSymbols;
    
    // 2
    // For example, we can only add value in case during declaring variable
    public static Print print2;
    print2 = Text;
    
    public static void CountSymbols(string text)
    {
        Console.WriteLine($"Text Length: {text.Length}");
    }
    public static void Text(string text)
    {
        Console.WriteLine($"{text}");
    }
}
// We can declare delegate in and outside class but not in method
delegate void Print(string text);

c#
using System.Net.Mime;

namespace ConsoleApp18;
class Program
{
    static void Main(string[] args)
    {
        // 3
        // Now we declare in method

        Print print;
        print = Text;
        print += CountSymbols;
        
        // But here it works well
    }

    // 1
    // During declaring the first variable we can add method
    // But when trying to add one more it's now working at all
    // With 'Cannot resolve symbol 'print' or 'CountSymbols''
    public static Print print = Text;
    print += CountSymbols;
    
    // 2
    // For example, we can only add value in case during declaring variable
    public static Print print2;
    print2 = Text;
    
    public static void CountSymbols(string text)
    {
        Console.WriteLine($"Text Length: {text.Length}");
    }
    public static void Text(string text)
    {
        Console.WriteLine($"{text}");
    }
}
// We can declare delegate in and outside class but not in method
delegate void Print(string text);

sibber•6mo ago

2. for the same reason you cant do i = 5; outside of a function im not sure what you mean in 1

Unknown User•6mo ago

Message Not Public

sibber•6mo ago

ill also note that initializing fields does count as code execution, but its kind of an exception

Unknown User•6mo ago

Message Not Public

sibber•6mo ago

behind the scenes in the compiled code, its done in the (generated) ctor

Unknown User•6mo ago

Message Not Public

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Delegates