如何在 2 个 C# 类之间共享字符串

Question

In my first class i have this Code:

public string getUser()
    {
        string UserName = metroTextBox4.Text;
        return UserName;
    }
    
    public string EmailAddr()
    {
        string Addr = metroTextBox1.Text;
        return Addr;
    }

And in my other class i have this code:

private async Task kka(int value)
    {
        var senderg = new SmtpSender(() => new SmtpClient("localhost")

        {
            EnableSsl = false,
            DeliveryMethod = SmtpDeliveryMethod.Network,
            Port = 25
            

        });


        Email.DefaultSender = senderg;

        var email = await Email
            .From("myEmail@example.com")
            .To($"{EmailAddr()}", $"{getUser()}") //At getUser() and at EmailAddr i have the errors
            .Subject("Salut")
            .Body("Mersi ca mi-ai cumparat produsul, sa ai pofta!" +
            $"Comanda ta a avut valoarea de {value} lei")
            .SendAsync();
    }

The errors are "The name 'EmailAddr' does not exist in the current context" and "The name 'getUser' does not exist in the current context"

Answer 1

You will have to create an object of the first class inside the second class's method and reference the methods EmailAddr() and getUser() using that reference.

FirstClass fObj = new FirstClass();
fObj.EmailAddr();
fObj.getUser();

or as rightly mentioned in the comment by Olivier, you can pass a reference to the first class in the constructor of the second class

Answer 2

so many different approaches. will give you first 2 option 1 : send email as parameter to function

private async Task kka(int value, string email)

option 2 : use static class to set property. so you can read it from other class

void Main()
{
    EmailAddr2.EmailAddress = EmailAddr();
    TODO();
}

private void TODO()
{
    EmailAddr2.EmailAddress.Dump();
}


public string EmailAddr()
{
    string Addr = "my@email.com";
    return Addr;
}


public static class EmailAddr2
{
    public static string EmailAddress {get;set;}
}