Data Binding and Thread Safety - Why doesn't this work?

attempting bind textbox error logging in windows forms.

bind textbox this:

this.operationeventhistorytextbox.databindings.add("text", this.logger, "operationlog")

logger object instance of logger class, contains following property.

public string operationlog  {           {         return this.operationlog;      }      set      {         if (this.operationlog != value)         {             this.operationlog = value;             system.componentmodel.propertychangedeventhandler handler = this.propertychanged;             if (handler != null)             {                 handler(this, new system.componentmodel.propertychangedeventargs("operationlog"));              }          }      }  }

, error when calling this.logger.logevent("message"). my logevent method contains following:

public void logevent(string msg)  {      this.operationlog += system.datetime.now + ": " + msg + "\r\n";  }

the invalidoperationexception says there invalid cross-thread operation, , control operationeventhistorytextbox was accessed thread other thread created on.

understand mean i've written parts of code in way wasn't thread-safe, don't understand why, or fix.

go around setting of these functions invoke rather directly called, i'd understand isn't working.

update: i've attempted use system.threading.scynchronizationcontext to raise propertychanged event on correct thread, however, continue error. here new setter property:

set  {      if (this.operationlog != value)      {          system.threading.synchronizationcontext context = system.threading.synchronizationcontext.current                                                            ?? new system.threading.synchronizationcontext();          this.operationlog = value;          context.send(              (s) =>                 {                     system.componentmodel.propertychangedeventhandler handler = this.propertychanged;                     if (handler != null)                     {                         handler(this, new system.componentmodel.propertychangedeventargs("operationlog"));                     }                 },                 null);     }  }

not correctly creating the synchronizationcontext? or there else @ work here?

obviously don't think should put synchronizationcontext setter. check before set value.

chanmm

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chanmm

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