C#•2y ago

Only one compilation unit can have top-level statements. [Project]csharp(CS8802) [Answered]

I want to make my code cleaner by making different files. But when i make different files i get this error. Any help?

15 Replies

EliasGPS•2y ago

if i write this code in my other file than there is no problem but i want different files to make my code cleaner

cap5lut•2y ago

then use regular classes instead of top-level statements in the other files

EliasGPS•2y ago

uhh what? i'm new to c# soory

cap5lut•2y ago

top-level statements are basically just there to remove some boiler plate

Console.WriteLine("Hello World");

Console.WriteLine("Hello World");

is just short for

public class Program
{
  public static void Main(string[] args)
  {
    Console.WriteLine("Hello World");
  }
}

public class Program
{
  public static void Main(string[] args)
  {
    Console.WriteLine("Hello World");
  }
}

EliasGPS•2y ago

oh ok how can i use regular classes than?

SwaggerLife•2y ago

C# only allows top level in Program.cs.

cap5lut•2y ago

so if u would want to split up ur code for readability u would have to write more methods/classes. it highly depends on the nature of ur application how to split it up semantically

SwaggerLife•2y ago

You have to put your code inside classes.

EliasGPS•2y ago

yeah yeah i understand is there an externsion is vscode to beautify my code

SwaggerLife•2y ago

You can reformat using shit alt f You should be good to go if you have the c# extension installed.

cap5lut•2y ago

basically methods/classes are grouping some logic together, eg, one to read data from a website, another to process that data and a third to give some output. ur Main method (or Program.cs' top level statements) would simply "wire" the method calls together into the actual program

EliasGPS•2y ago

oh yeah ok thx

cap5lut•2y ago

basically u could do something like

public class Program
  {
  public static void Main(string[] args)
  {
    var data = FetchData(); // here u can omit the Program.FetchData() and use just FetchData() because its within the same class
    var result = ProcessData(data);
    OutputResult(result);
  }

  private static string FetchData()
  {
    // use the HttpClient to grab data from an url
    return "123"; // just an example
  }

  private static int ProcessData(string data)
  {
    return int.Parse(data);
  }

  private static void OutputResult(int result)
  {
    Console.WriteLine($"The result is {result}");
  }
}

public class Program
  {
  public static void Main(string[] args)
  {
    var data = FetchData(); // here u can omit the Program.FetchData() and use just FetchData() because its within the same class
    var result = ProcessData(data);
    OutputResult(result);
  }

  private static string FetchData()
  {
    // use the HttpClient to grab data from an url
    return "123"; // just an example
  }

  private static int ProcessData(string data)
  {
    return int.Parse(data);
  }

  private static void OutputResult(int result)
  {
    Console.WriteLine($"The result is {result}");
  }
}

(these are ofc just rough examples) also i would recommend to do some beginner tutorials first to get the basics down (ofc, we r here to help on arising questions/problems) if ur question is answered now, please use /close to mark it as that @EliasGPS ⤴️

EliasGPS•2y ago

i just made another file with another class and than i make an object in the main file and call my method

Accord•2y ago

✅ This post has been marked as answered!

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Only one compilation unit can have top-level statements. [Project]csharp(CS8802) [Answered]