How Can I Get the Current Line Number in My C# Code?

Retrieving Current Line Number in Your Code

If you're working with code and want to know which line number is currently being executed, there's a solution for you.

You can accomplish this using the compiler's assistance in .NET 4.5 / C# 5. Here's how:

1. Define a utility method that leverages the caller attributes:

using System.Runtime.CompilerServices;

static void SomeMethodSomewhere()
{
    ShowMessage("Boo");
}

2. Create a method called ShowMessage that accepts a message, along with optional parameters for the caller's line number and member name:

static void ShowMessage(string message,
    [CallerLineNumber] int lineNumber = 0,
    [CallerMemberName] string caller = null)
{
     MessageBox.Show(message + " at line " + lineNumber + " (" + caller + ")");
}

3. Call ShowMessage from your code:

SomeMethodSomewhere();

The output will display, for instance:

Boo at line 39 (SomeMethodSomewhere)

Additionally, if you need the path of the original code file, the [CallerFilePath] attribute can provide that information.

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