Can you use reflection to find the name of the currently executing method?

For non-async methods one can use

System.Reflection.MethodBase.GetCurrentMethod().Name;

https://docs.microsoft.com/en-us/dotnet/api/system.reflection.methodbase.getcurrentmethod

Please remember that for async methods it will return "MoveNext".

The snippet provided by Lex was a little long, so I'm pointing out the important part since no one else used the exact same technique:

string MethodName = new StackFrame(0).GetMethod().Name;

This should return identical results to the MethodBase.GetCurrentMethod().Name technique, but it's still worth pointing out because I could implement this once in its own method using index 1 for the previous method and call it from a number of different properties. Also, it only returns one frame rather then the entire stack trace:

private string GetPropertyName()
{  //.SubString(4) strips the property prefix (get|set) from the name
    return new StackFrame(1).GetMethod().Name.Substring(4);
}

It's a one-liner, too ;)

Try this inside the Main method in an empty console program:

MethodBase method = MethodBase.GetCurrentMethod();
Console.WriteLine(method.Name);

Console Output:
Main

Yes definitely.

If you want an object to manipulate I actually use a function like this:

public static T CreateWrapper<T>(Exception innerException, params object[] parameterValues) where T : Exception, new()
{
    if (parameterValues == null)
    {
        parameterValues = new object[0];
    }

    Exception exception   = null;
    StringBuilder builder = new StringBuilder();
    MethodBase method     = new StackFrame(2).GetMethod();
    ParameterInfo[] parameters = method.GetParameters();
    builder.AppendFormat(CultureInfo.InvariantCulture, ExceptionFormat, new object[] { method.DeclaringType.Name, method.Name });
    if ((parameters.Length > 0) || (parameterValues.Length > 0))
    {
        builder.Append(GetParameterList(parameters, parameterValues));
    }

    exception = (Exception)Activator.CreateInstance(typeof(T), new object[] { builder.ToString(), innerException });
    return (T)exception;
}

This line:

MethodBase method     = new StackFrame(2).GetMethod();

Walks up the stack frame to find the calling method then we use reflection to obtain parameter information values passed to it for a generic error reporting function. To get the current method simply use current stack frame (1) instead.

As others have said for the current methods name you can also use:

MethodBase.GetCurrentMethod()

I prefer walking the stack because if look internally at that method it simply creates a StackCrawlMark anyway. Addressing the Stack directly seems clearer to me

Post 4.5 you can now use the [CallerMemberNameAttribute] as part of the method parameters to get a string of the method name - this may help in some scenarios (but really in say the example above)

public void Foo ([CallerMemberName] string methodName = null)

This seemed to be mainly a solution for INotifyPropertyChanged support where previously you had strings littered all through your event code.

EDIT: MethodBase is probably a better way to just get the method you're in (as opposed to the whole calling stack). I'd still be concerned about inlining however.

You can use a StackTrace within the method:

StackTrace st = new StackTrace(true);

And the look at the frames:

// The first frame will be the method you want (However, see caution below)
st.GetFrames();

However, be aware that if the method is inlined, you will not be inside the method you think you are. You can use an attribute to prevent inlining:

[MethodImpl(MethodImplOptions.NoInlining)]

For Async Methods, you can use:

//using System.Reflection;

var myMethodName = MethodBase
                    .GetCurrentMethod()
                    .DeclaringType
                    .Name
                    .Substring(1)
                    .Split('>')[0];

How about this:

StackFrame frame = new StackFrame(1);
frame.GetMethod().Name; //Gets the current method name

MethodBase method = frame.GetMethod();
method.DeclaringType.Name //Gets the current class name

A bit more resilient, solution for customers from 2021,2022:

namespace my {
   public struct notmacros
   {

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static string 
  whoami( [CallerMemberName] string caller_name = null)
  {
     if (string.IsNullOrEmpty(caller_name)) 
        return "unknown";
     if (string.IsNullOrWhiteSpace(caller_name)) 
        return "unknown";
     return caller_name;
  }
 }
} // my namespace

Usage

using static my.notmacros
 // somewhere  appropriate
 var my_name = whoami() ;

.NET fiddle link for the actual demo:

https://dotnetfiddle.net/moK73n

Please note the compiler requirement: .NET 6

To handle both async and plain old method calls, I did this.

In my application, it's only getting called from exception handlers, so perf is not a concern.

[MethodImpl(MethodImplOptions.NoInlining)]
public static string GetCurrentMethodName()
{
    var st = new StackTrace();
    var sf = st.GetFrame(1);
    string name = sf.GetMethod().Name;

    if (name.Equals("MoveNext"))
    {
        // We're inside an async method
        name = sf.GetMethod().ReflectedType.Name
                 .Split(new char[] { '<', '>' }, StringSplitOptions.RemoveEmptyEntries)[0];
    }

    return name;
}

I think you should be able to get that from creating a StackTrace. Or, as @edg and @Lars Mæhlum mention, MethodBase.GetCurrentMethod()

using System;
                    
public class Program
{
    public static void Main()
    {
        
        Console.WriteLine("1: {0} {1}", System.Reflection.MethodBase.GetCurrentMethod().Name, System.Reflection.MethodBase.GetCurrentMethod().ReflectedType);
        OtherMethod();
    }
    
    public static void OtherMethod()
    {
        Console.WriteLine("2: {0} {1}", System.Reflection.MethodBase.GetCurrentMethod().Name, System.Reflection.MethodBase.GetCurrentMethod().ReflectedType);
    }
}

Output:

1: Main Program
2: OtherMethod Program

Add this method somewhere and call it without parameter!

public static string GetCurrentMethodName([System.Runtime.CompilerServices.CallerMemberName] string name = "")
{
    return name;
}

new StackTrace().ToString().Split("\r\n",StringSplitOptions.RemoveEmptyEntries)[0].Replace("at ","").Trim()