如何在一个字符串中组合两个不同的字符串？

Question

I have checked most of the questions might contain my solution but I couldn't find any. Or maybe I didn't understand. So, here is my question:

I want to combine two strings in one and keep using it alone.

My strings:

    static string name = ""; (for example: John or Jane)
    static string gender = ""; (for example: Mr. or Mrs.)

and I want to combine these two in one like this:

    static string player = gender+name;

    Console.writeline("Hello "+player);

and I want to see it in my console like this:

 Hello Mr.John or Hello Mrs.Jane

I didn't want to mention console.readline parts. There will be entries where I will type name and gender. Thanks

EDIT:

This is what I did (Sorry, it take too long):

    static string name = "";
    static string gender = "";
    static string player = name + gender;
    static void Main(string[] args)
    {

        Console.WriteLine("Welcome. What is your name?");
        name = Console.ReadLine();
        Console.WriteLine("Sex?\n-Male\n-Female");
        gender = Console.ReadLine();
        Console.WriteLine("Press Enter to continue");
        Console.ReadLine();
        Console.WriteLine("Welcome"+player);

        Console.ReadLine();
    }

These result like "Welcome __ "

Answer 1

The problem here is that player is calculated at the class initialization. So basically you're combining string.Empty and string.Empty . Player is not calculated before each use.

So you could just do player = name + gender; before using it, but a good practice is to use variables restrained to the scope they're used in. Since you're name and gender are used in Main, use local variables.

static void Main(string[] args)
{
    string name;
    string gender;

    Console.WriteLine("Welcome. What is your name?");
    name = Console.ReadLine();

    Console.WriteLine("Sex?\n-Male\n-Female");
    gender = Console.ReadLine();

    Console.WriteLine("Press Enter to continue");
    Console.ReadLine();

    Console.WriteLine("Welcome " + gender + name);

    Console.ReadLine();
}

If you prefer, you can also do

string player = gender + name;
Console.WriteLine("Welcome " + player);

but I think the intent was clear enough without the temp variable. If you need more complex formatting, you can also string.Format , it's cleaner than a bunch of + operators.

 Console.WriteLine(string.Format("Welcome, {0} {1}!", gender, name));

Answer 2

You read name and gender but you never combine them after getting their value, so player still remains an empty string.

Do this, instead:

player = gender + name;
Console.WriteLine("Welcome "+player);

Answer 3

Console.ReadLine();
player = gender+name;
Console.WriteLine("Welcome"+player);

This will set the strings to what they have been read as. You would also need an if statement to change fe/male to mr/s.

Answer 4

The problem is that player should be a function, not a string.

String Player()
{
     return gender + name;
}

This has to be outside your main function.

Answer 5

You can use String.Concat(string firstString,string secondString) , if you want to merge strings with no delimiter. And you can use String.Join(string separator, string[] stringsToBeJoined) . The first parameter is the separator between strings in the merged single string and the second parameter is the array of strings which will be merged.