How to store per thread contextual data in c#? -

my concrete need store remote ip can printed while logging, without explicitly passing down every method call. sort of per thread environment variable scope.

i thought of having per thread singleton logger can access it. there better/safer way?

make work async plus.

my ideal api should this:

using (new logscope("key1", "value1")) {    call1(); }  using (new logscope("key1", "value1")) {     call1(); }  void call1() {     using (new logscope("key2", "value2"))     {         call2();     // key1:value1 key2:value2         using (new logscope("key1", "value3"))         {             call2(); // key1:value3 key2:value2         }     }     using (new logscope("key1", "value3"))     {         call2();     // key1:value3     } }  void call2() {     foreach (var kv in logscope.context) console.write("'{0}':'{1}' ");     console.writeline(); } 

not optimal implementation. should looking for. , should @ least demonstrate principles can reuse.

public class logscope : idisposable {     private static readonly threadlocal<stack<dictionary<string, string>>> currentdictionary =         new threadlocal<stack<dictionary<string, string>>>(() => new stack<dictionary<string, string>>());      public logscope(string key, string value)     {         var stack = currentdictionary.value;         dictionary<string, string> newdictionary = null;         if (stack.count == 0)         {             newdictionary = new dictionary<string, string>();         }         else         {             newdictionary = new dictionary<string, string>(stack.peek());         }          newdictionary[key] = value;          stack.push(newdictionary);     }      public void dispose()     {         currentdictionary.value.pop();     }      public static ienumerable<keyvaluepair<string, string>> context     {                 {             var stack = currentdictionary.value;             if (stack.count == 0)             {                 return enumerable.empty<keyvaluepair<string, string>>();             }             else             {                 return stack.peek();             }         }     } } 

edit: should specify in implementation of logscope, instance of logscope work if instantiated , disposed on same thread. if create logscope in 1 thread, , dispose in thread, results undefined. likewise, while logscope instance in effect, key/values visible within thread.