程序不包含适用于入口点 C# 的静态“Main”方法 test_test

Question

CS 5001: Program does not contain a static 'Main' method test_test suitable for an entry point.

The above error is given then I try to run the program along with an error attracted to the txt file call in the main stating:

there is no argument given that corresponds to the required formal parameter 'arr' of 'txt_program.txt(string[][])'

Furthermore the program is an console app with the following code for an item:

namespace text_test
}
class txt_program
    {
        public void txt()
        {
        string[] string1 = new string[] {"a", "a", "a" };
        string[] string2 = new string[] { "b", "b", "b" };
        string[] string3 = new string[] { "c", "c", "c" };

        string[][] names = new string[][] { string1, string2, string3 };

            using (StreamWriter SW = new StreamWriter(@"txt.txt"))
            {
             for (int i = 0; i < 3; i++)
            {
                for (int a = 0; a < 3; a++)
                {
                    Console.Write(" " + arr[i][a]);
                }
                Console.WriteLine();
                }
            }
        }
    }
}

The above code is called in the main by using the following code:

namespace text_test
{
class Program
{
    static void Main(string[][] args)
    {
    new txt_program().txt();
    }
}
}

The wished output is a textfile looking like the following:

a a a
b b b
c c c

Answer 1

Some issues....

"there is no argument given that corresponds to the required formal parameter 'arr'" You have no variable declared named 'arr', did you mean to use 'names' here?

These

string[] string3 = new string[] { "c", "c", "c" };

You probably meant to do

char[] string3 = {'c','c','c'};

but even that is not nessisary, just use

string string3 = "ccc";

Strings are just char arrays already so you can do

string string3 = "abc";
string3[2] == 'c'; (true)

for this

string[][] args

You probably should have

string[] args

but you never access args here so its not necessary for the code you provided.

For your startup issues right click the project and in the Application tab of visual studio under startup object you should have 'text_test.Program' selected in the drop down.