Here is a class provides that functionality:
class Scope : IDisposable
{
Action<string> _logger;
string _memberName;
public Scope(Action<string> logger, [CallerMemberName] string memberName = "N/A")
{
if (logger == null) throw new ArgumentNullException();
_logger = logger;
_memberName = memberName;
_logger(string.Format("Entered {0}", _memberName));
}
public void Dispose()
{
_logger(string.Format("Exited {0}", _memberName));
}
}
And to use it:
static void MyMethod()
{
using (new Scope(s => Console.WriteLine(s)))
{
// boddy
}
}
Note: If you use previous versions of C# that does not support [CallerMemberName]
attribute, you have to provide memberName
explicitly.
Also you can use this helper class that I use myself in version prior to .NET 4.5:
public static class Here
{
public static string Spot(HereOptions options)
{
return MakeMessageInternals(options, 3);
}
public static string Type
{
get
{
return MakeMessageInternals(HereOptions.Type, 3);
}
}
public static string Member
{
get
{
return MakeMessageInternals(HereOptions.Member, 3);
}
}
public static string FileLine
{
get
{
return MakeMessageInternals(HereOptions.FileLine, 3);
}
}
public static string FileName
{
get
{
return MakeMessageInternals(HereOptions.FileName, 3);
}
}
static StackFrame GetCaller(int index) { return new StackTrace(true).GetFrame(index); }
static string MakeMessageInternals(HereOptions options, int index)
{
StackFrame first = null;
var _FileName = new StringBuilder();
var _FileLine = new StringBuilder();
var _Member = new StringBuilder();
var _Type = new StringBuilder();
if ((options & HereOptions.FileName) == HereOptions.FileName)
{
first = GetCaller(index);
if (first != null)
{
var fn = first.GetFileName();
if (!string.IsNullOrEmpty(fn))
_FileName.Append(" " + Path.GetFileName(fn));
}
}
if ((options & HereOptions.FileLine) == HereOptions.FileLine)
{
if (first == null)
first = GetCaller(index);
if (first != null)
{
var ln = first.GetFileLineNumber();
_FileLine.Append(" #" + ln);
}
}
if ((options & HereOptions.Member) == HereOptions.Member)
{
if (first == null)
first = GetCaller(index);
if (first != null)
{
var mn = first.GetMethod().Name;
_Member.Append(" " + mn);
}
}
if ((options & HereOptions.Type) == HereOptions.Type)
{
if (first == null)
first = GetCaller(index);
if (first != null)
{
var dt = first.GetMethod().DeclaringType;
_Type.Append(string.Format(" ({0})", dt));
}
}
var messageInternal = string.Format("{0}{1}{2}{3}",
_FileName,
_FileLine,
_Member,
_Type).Trim();
return messageInternal;
}
}
[Flags]
public enum HereOptions : byte
{
None = 0,
FileName = 1,
FileLine = 2,
Member = 4,
Type = 8,
All = 15
}