Updated: October 24, 2013
Represents the arguments for the SimultaneousChanged event, which occurs after a simultaneous configuration change has been applied to a role. A simultaneous configuration change affects all role instances at the same time.
Microsoft.WindowsAzure.ServiceRuntime (in Microsoft.WindowsAzure.ServiceRuntime.dll)
Public Class SimultaneousChangedEventArgs
Gets a collection of the topology changes that were applied to a role.
The SimultaneousChanged event and the SimultaneousChanging event are used together to identify and manage simultaneous configuration changes to the service model. The SimultaneousChangedEventArgs object provides the changes that were made in the service configuration. The changes are of the type SimultaneousTopologyChange.
The following code example shows how to use the SimultaneousChangedEventArgs object to write out the list of simultaneous topology changes that were made to the role:
public override bool OnStart()
RoleEnvironment.SimultaneousChanged += RoleEnvironmentSimultaneousChanged;
private void RoleEnvironmentSimultaneousChanged(object sender,
// Get the list of topology changes
var topologyChanges =
foreach (var change in topologyChanges)
var message = "Topology change: " + change.RoleName;
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Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.