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C#

C# static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your C# code

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Filtered: 1 rule found
winforms
    Impact
      Clean code attribute
        1. Windows Forms entry points should be marked with STAThread

           Bug

        Windows Forms entry points should be marked with STAThread

        intentionality - logical
        reliability
        Bug
        • winforms
        • pitfall

        Why is this an issue?

        When an assembly uses Windows Forms (classes and interfaces from the System.Windows.Forms namespace) its entry point should be marked with the STAThreadAttribute to indicate that the threading model should be "Single-Threaded Apartment" (STA) which is the only one supported by Windows Forms.

        This rule raises an issue when the entry point (static void Main method) of an assembly using Windows Forms is not marked as STA.

        Noncompliant code example

        using System;
        using System.Windows.Forms;
        
        namespace MyLibrary
        {
            public class MyForm: Form
            {
                public MyForm()
                {
                    this.Text = "Hello World!";
                }
        
                public static void Main()  // Noncompliant
                {
                    var form = new MyForm();
                    Application.Run(form);
                }
            }
        }
        

        Compliant solution

        using System;
        using System.Windows.Forms;
        
        namespace MyLibrary
        {
            public class MyForm: Form
            {
                public MyForm()
                {
                    this.Text = "Hello World!";
                }
        
                [STAThread]
                public static void Main()
                {
                    var form = new MyForm();
                    Application.Run(form);
                }
            }
        }
        
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