WorkflowDesignerLoader.PerformLoad(IDesignerSerializationManager) Method
Definition
Important
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Loads the designer from a design document.
protected:
override void PerformLoad(System::ComponentModel::Design::Serialization::IDesignerSerializationManager ^ serializationManager);
protected override void PerformLoad (System.ComponentModel.Design.Serialization.IDesignerSerializationManager serializationManager);
override this.PerformLoad : System.ComponentModel.Design.Serialization.IDesignerSerializationManager -> unit
Protected Overrides Sub PerformLoad (serializationManager As IDesignerSerializationManager)
Parameters
- serializationManager
- IDesignerSerializationManager
Class that implements the IDesignerSerializationManager interface, which manages design-time serialization.
Examples
The following example shows how to override the PerformLoad
method to deserialize a workflow and load it in the designer using the AddObjectGraphToDesignerHost
helper method.
protected override void PerformLoad(IDesignerSerializationManager serializationManager)
{
IDesignerHost designerHost = (IDesignerHost)GetService(typeof(IDesignerHost));
Activity rootActivity = null;
// If a WorkflowType already exists, create an instance instead of reading from file
if (WorkflowType != null)
{
rootActivity = (Activity)Activator.CreateInstance(WorkflowType);
}
else
{
// Create a text reader out of the doc data
TextReader reader = new StringReader(this.xoml);
try
{
using (XmlReader xmlReader = XmlReader.Create(reader))
{
WorkflowMarkupSerializer xomlSerializer = new WorkflowMarkupSerializer();
rootActivity = xomlSerializer.Deserialize(xmlReader) as Activity;
}
}
finally
{
reader.Close();
}
}
if (rootActivity != null && designerHost != null)
{
AddObjectGraphToDesignerHost(designerHost, rootActivity);
}
}
private static void AddObjectGraphToDesignerHost(IDesignerHost designerHost, Activity activity)
{
Guid Definitions_Class = new Guid("3FA84B23-B15B-4161-8EB8-37A54EFEEFC7");
if (designerHost == null)
throw new ArgumentNullException("designerHost");
if (activity == null)
throw new ArgumentNullException("activity");
string rootSiteName = activity.QualifiedName;
if (activity.Parent == null)
{
string fullClassName = activity.UserData[Definitions_Class] as string;
if (fullClassName == null)
fullClassName = activity.GetType().FullName;
rootSiteName = (fullClassName.LastIndexOf('.') != -1) ? fullClassName.Substring(fullClassName.LastIndexOf('.') + 1) : fullClassName;
designerHost.Container.Add(activity, rootSiteName);
}
else
{
designerHost.Container.Add(activity, activity.QualifiedName);
}
if (activity is CompositeActivity)
{
foreach (Activity activity2 in GetNestedActivities(activity as CompositeActivity))
designerHost.Container.Add(activity2, activity2.QualifiedName);
}
}
private static Activity[] GetNestedActivities(CompositeActivity compositeActivity)
{
if (compositeActivity == null)
throw new ArgumentNullException("compositeActivity");
IList<Activity> childActivities = null;
ArrayList nestedActivities = new ArrayList();
Queue compositeActivities = new Queue();
compositeActivities.Enqueue(compositeActivity);
while (compositeActivities.Count > 0)
{
CompositeActivity compositeActivity2 = (CompositeActivity)compositeActivities.Dequeue();
childActivities = compositeActivity2.Activities;
foreach (Activity activity in childActivities)
{
nestedActivities.Add(activity);
if (activity is CompositeActivity)
compositeActivities.Enqueue(activity);
}
}
return (Activity[])nestedActivities.ToArray(typeof(Activity));
}
Protected Overrides Sub PerformLoad(ByVal serializationManager As IDesignerSerializationManager)
Dim designerHost As IDesignerHost = CType(GetService(GetType(IDesignerHost)), IDesignerHost)
Dim rootActivity As Activity = Nothing
' If a WorkflowType already exists, create an instance instead of reading from file
If WorkflowType IsNot Nothing Then
rootActivity = CType(Activator.CreateInstance(WorkflowType), Activity)
Else
' Create a text reader out of the doc data
Dim reader As TextReader = New StringReader(Me.Xoml)
Try
Using xmlReader As XmlReader = xmlReader.Create(reader)
Dim xomlSerializer As New WorkflowMarkupSerializer()
rootActivity = CType(xomlSerializer.Deserialize(xmlReader), Activity)
End Using
Finally
reader.Close()
End Try
End If
If rootActivity IsNot Nothing And designerHost IsNot Nothing Then
AddObjectGraphToDesignerHost(designerHost, rootActivity)
End If
End Sub
Private Shared Sub AddObjectGraphToDesignerHost(ByVal designerHost As IDesignerHost, ByVal activity As Activity)
Dim Definitions_Class As New Guid("3FA84B23-B15B-4161-8EB8-37A54EFEEFC7")
If designerHost IsNot Nothing Then
Throw New ArgumentNullException("designerHost")
End If
If activity IsNot Nothing Then
Throw New ArgumentNullException("activity")
End If
Dim rootSiteName As String = activity.QualifiedName
If activity.Parent Is Nothing Then
Dim fullClassName As String = CType(activity.UserData(Definitions_Class), String)
If fullClassName Is Nothing Then
fullClassName = activity.GetType().FullName
End If
rootSiteName = IIf(Not fullClassName.LastIndexOf(".") = -1, fullClassName.Substring(fullClassName.LastIndexOf(".") + 1), fullClassName)
designerHost.Container.Add(activity, rootSiteName)
Else
designerHost.Container.Add(activity, activity.QualifiedName)
End If
If TypeOf activity Is CompositeActivity Then
For Each activity2 As Activity In GetNestedActivities(CType(activity, CompositeActivity))
designerHost.Container.Add(activity2, activity2.QualifiedName)
Next
End If
End Sub
Private Shared Function GetNestedActivities(ByVal compositeActivity As CompositeActivity) As Activity()
If compositeActivity Is Nothing Then
Throw New ArgumentNullException("compositeActivity")
End If
Dim childActivities As IList(Of Activity) = Nothing
Dim nestedActivities As New ArrayList()
Dim compositeActivities As New Queue()
compositeActivities.Enqueue(compositeActivity)
While compositeActivities.Count > 0
Dim compositeActivity2 As CompositeActivity = CType(compositeActivities.Dequeue(), CompositeActivity)
childActivities = compositeActivity2.Activities
For Each activity As Activity In childActivities
nestedActivities.Add(activity)
If (activity Is compositeActivity) Then
compositeActivities.Enqueue(activity)
End If
Next
End While
Return CType(nestedActivities.ToArray(GetType(Activity)), Activity())
End Function
Applies to
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