Simple App C# console in Visual Studio 2017, closes without showing the result

Question

I’m trying to run a simple program that writes "Hello world" on VS2017:

namespace OlaMundo
{
    class Program
    {
        static void Main()
        {
            int num;

            System.Console.WriteLine("Número :");

         num = System.Console.Read();

            System.Console.WriteLine(num);
        System.Console.WriteLine("Tecle enter para fechar...");

        System.Console.ReadLine();

    }
}
}

but in executing it I come across the following problem:

"OlaMundo.exe" (CLR v4.0.30319: DefaultDomain): Carregado "C:\WINDOWS\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll". Não é possível localizar ou abrir o arquivo PDB.
"OlaMundo.exe" (CLR v4.0.30319: DefaultDomain): Carregado "C:\Users\tiago\source\repos\C#\01_Hello_world\OlaMundo\OlaMundo\bin\Debug\OlaMundo.exe". Símbolos carregados.
O programa "[1688] OlaMundo.exe" foi fechado com o código 0 (0x0).

I’ve disabled the option "Just my code" and I’ve also deleted the folder "bin" of the project and recompiled again. However, I did not have any success.

Answer 1

Apparently there is nothing wrong, the console closes because the application has finished its flow... if you want to keep the window open and keep reading the "Hello, Wolrd", add a waiting point, as the input of some value.

Your second problem is because you are not converting the type and using the wrong method. All inputs via console are String type, in your code you need to validate and convert to the expected type.

namespace OlaMundo
{
    class Program
    {
        static void Main(string[] args)
        {

            int num;
            Console.WriteLine("Número :");
            num = Convert.ToInt32(System.Console.ReadLine());

            Console.WriteLine(num);

            //Adicione esse trecho ao final da sua Main
            #if DEBUG
            Console.WriteLine("Tecle enter para fechar...");
            Console.ReadLine();
            #endif
        }
    }
}