/// <summary>
/// Gets a value associated with the given key in the current scope.
/// </summary>
/// <param name="key">The key to look up.</param>
/// <returns>The value associated with the key, or null of the value was not set.</returns>
public static object GetValue(string key)
{
var data = (TraceContext)AsyncLocalContext.GetData(_slot);
if (data == null)
{
return(null);
}
return(data[key]);
}
private static Guid GetActivityId()
{
// if we have stored a guid, then return that
var data = AsyncLocalContext.GetData(_slot);
if (data != null)
{
return((Guid)data);
}
return(Guid.Empty);
}
/// <summary>
/// Starts a new TraceContext scope.
/// </summary>
/// <returns>The new TraceContext that can be filled in.</returns>
public static TraceContext Begin()
{
var data = (TraceContext)AsyncLocalContext.GetData(_slot);
TraceContext context = null;
try
{
context = new TraceContext(data);
AsyncLocalContext.SetData(_slot, context);
}
catch
{
context.Dispose();
throw;
}
return(context);
}