Error "Does not contain a static "Main" Method suitable for an entry point [duplicate]

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"does not contain a static 'main' method suitable for an entry point" (7 answers)

Closed 8 years ago.

I got this Error when I try to compile a sourcecode with CodeDom

Does not contain a static "Main" Method suitable for an entry point!

I already googled it and read other answers here, but I dont know how to fix it.

Can someone please help me? Here is my source code : http://picz.to/image/ao5n

    ^        private void button2_Click(object sender, EventArgs e)
    {
        SaveFileDialog d = new SaveFileDialog();
        d.Filter = "Executable (*.exe)|*.exe";
        if (d.ShowDialog() == DialogResult.OK)
        {
            string source = Properties.Resources.source;
            CompilerParameters param = new CompilerParameters();
            param.CompilerOptions += "/target:winexe" + " " + "/win32icon:" + "\"" + textBox1.Text + "\"";
            param.GenerateExecutable = true;
            param.ReferencedAssemblies.Add("System.Windows.Forms.dll");
            param.ReferencedAssemblies.Add("System.dll");
            param.OutputAssembly = d.FileName;

            StringBuilder Temp = new StringBuilder();
            String InputCode = String.Empty;
            InputCode = "MessageBox.Show((1 + 2 + 3).ToString());";
            Temp.AppendLine(@"using System;");
            Temp.AppendLine(@"using System.Windows.Forms;");
            Temp.AppendLine(@"namespace RunTimeCompiler{");
            Temp.AppendLine(@"static void Main(string[] args){");

            Temp.AppendLine(@"public class Test{");
            Temp.AppendLine(@"public void Ergebnis(){");

            Temp.AppendLine(InputCode);
            Temp.AppendLine(@"}}}}");
            CompilerResults result = new CSharpCodeProvider().CompileAssemblyFromSource(param, Temp.ToString());
            if (result.Errors.Count > 0) foreach (CompilerError err in result.Errors) MessageBox.Show(err.ToString());
            else MessageBox.Show("Done.");
        }
    }

Answer 1

All C# programs need to contain the Main() method. Essentially this is where the program starts. The code you posted is just a small part of the entire application. You must have removed the location where main had been residing.

MSDN Article on Main

Updated for comments:

A new Windows Form App has a Program class that instantiates the form that you want.

    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
     }

Try copying that over to a new file called program.cs. Make sure that Form1 now points to the form you created in the applications.

Answer 2

Paste this into your class -- if you still get an error, you need to paste the entire class in question, not just a screen capture of the event handler for a button click.

static void Main(string[] args)
{
  //do nothing
}

Answer 3

The code you've posted is the click event for a button. A button is usually on a form, and the form must be initialized. If you create a Windows Forms Application it will create a file Program.cs that contains a Main method that starts your form.

When you start a program, the computer needs to know where to actually start running code, that's what the Main() method is for. It is required to run, and that's the error you are receiving.