WF4.0 BASICS (26) Interop calls the Activity of WF3.X

This section describes the activities in which Interop calls WF3.X.

 

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Examples

 

Interop calls the Activity of WF3.X

Class Name	System. Activities. Statements. Interop
File	System. Workflow. Runtime. dll
Structure Description	Inherit NativeActivity, ICustomTypeDescriptor Is a sealed class Override [CacheMetadata method] and [Cancel method] and [Execute method] Override [CanInduceIdle attribute] [ActivityMetaProperties] The property type is [IDictionary <string, object>] [ActivityProperties] The property type is [IDictionary <string, object>] [ActivityType] the attribute Type is [Type]
Function Description	[ActivityType attribute] specifies the type of the WF3.5 Activity to be called. When the Activity type of WF3.5 is specified, two parameters [attribute name] and [attribute name Out] are automatically generated for the Activity binding of WF3.5 In the designer.

 

 

 

Instructions for use

The default WF4.0 project is [. NET Framework 4 Client Profile]. To use Interop, change the project to [. NET Framework 4].

 

Interop is not displayed in the toolbar by default. You need to add

 

 

[ActivityType attribute] specifies the type of the WF3.5 Activity to be called.

 

 

When the Activity type of WF3.5 is specified, two parameters [attribute name] and [attribute name Out] are automatically generated for the Activity binding of WF3.5 In the designer.

 

Example 1: Call the Activity of WF3.X

Note:

1. Create a WF3.X Activity with a binding attribute [printText]

The Activity prints the value of [printText] in the [Execute] method and assigns a new value to [printText ].

 

2. Create a WF4 workflow, use [Interop] to call the Activity of WF3.X, input a value for [printText], and print the return value through [printText ].

 

WF3.X Activity	Public Partial Class MyActivity: Activity { Public myActivity () { InitializeComponent (); }   [System. Diagnostics. DebuggerNonUserCode] [System. CodeDom. Compiler. GeneratedCode ("", "")] Private Void InitializeComponent () { This. Name = "myActivity "; }   Public Static Readonly DependencyProperty printTextProperty = DependencyProperty. Register ("printText", typeof (string), typeof (myActivity ));   Public String printText { Get { Return (string) base. GetValue (printTextProperty ); } Set { Base. SetValue (printTextProperty, value ); } }   Protected Override ActivityExecutionStatus Execute (ActivityExecutionContext context) { Console. WriteLine (this. printText ); This. printText = printText + ": wxd "; Return ActivityExecutionStatus. Closed; } }
WF4 Workflow
Host	Static Void test1 () { WorkflowInvoker. Invoke (new TestWorkflow ());   }
Result

 

 

Example 2: Code operation

Static Void test2 () {   Variable <string> myVariable = new Variable <string> () {Default = "wxwinter "}; Sequence root = new Sequence () { Variables = {myVariable }, Activities = {   New Interop () { ActivityType = typeof (myActivity ), ActivityProperties = {   {"PrintText", new InArgument <string> (myVariable )} , {"PrintTextOut", new OutArgument <string> (myVariable )}   }, ActivityMetaProperties = { // Provide a value for the Name meta-property of the WriteLine {"Name", "myActivity "} } } , New WriteLine {Text = myVariable} } };   WorkflowInvoker. Invoke (root ); }