IfElseActivity

IfElseBranch1

IfElseBranch2

Activities.CodeCondition

Condition事件

(Object sender, System.Workflow.Activities.ConditionalEventArgs e)

手工

代碼

從下拉框綁定時(shí)如報(bào)錯(cuò)

Dim codecondition1 As Workflow.Activities.CodeCondition = New CodeCondition

AddHandler codecondition1.Condition, AddressOf Me.ifElse_a_Condition

Me.ifElseBranchActivity1.Condition = codecondition1

System.Workflow.Activities.CodeCondition codecondition1 = new CodeCondition();

codecondition2.Condition += new System.EventHandler<Activities.ConditionalEventArgs>(this.ifElse1_Condition);

this.ifElseBranch1.Condition = codecondition2;

方法

格式

?'Code Condition模式的判斷，由對(duì)e.Result賦不同值決定執(zhí)行不同的分支

?Private Sub ifElse_a_Condition(ByVal sender As Object, ByVal e As Workflow.Activities.ConditionalEventArgs)

??????? 'e.Result如果為真，就執(zhí)行左邊(為真件條)的IfElseBranch容器

??????? 'e.Result如果為假，就執(zhí)行右邊(為假件條)的IfElseBranch容器

??????? If temp = "456" Then

??????????? e.Result = True

??????? Else

??????????? e.Result = False

??????? End If

??? End Sub

??????? void ifElse1_Condition(Object sender, System.Workflow.Activities.ConditionalEventArgs e)

??????? {

??????????? if (wxwinter = "lzm")

??????????? { e.Result = true; }

??????????? else

??????????? { e.Result = false; }

????????? }

?Dim ruleconditionreference1 As Workflow.Activities.Rules.RuleConditionReference = New .RuleConditionReference

?ruleconditionreference1.ConditionName = "Condition1"

?Me.ifElseBranchActivity3.Condition = ruleconditionreference1

System.Workflow.Activities.Rules.RuleConditionReference ruleconditionreference1 = new Rules.RuleConditionReference();

ruleconditionreference1.ConditionName = "abcd";

this.ifElseBranch3.Condition = ruleconditionreference1;

<RuleDefinitions xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow">

????? <RuleDefinitions.Conditions>

?????????? <RuleExpressionCondition Name="abcd">

???????????????? <RuleExpressionCondition.Expression>

????????????????????? <ns0:CodeBinaryOperatorExpression Operator="ValueEquality" xmlns:ns0="clr-namespace:System.CodeDom;Assembly=System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">

??????????????????????????? <ns0:CodeBinaryOperatorExpression.Left>

????????????????????????????????? <ns0:CodeFieldReferenceExpression FieldName="wxwinter">

?????????????????????????????????????? <ns0:CodeFieldReferenceExpression.TargetObject>

???????????????????????????????????????????? <ns0:CodeThisReferenceExpression />

?????????????????????????????????????? </ns0:CodeFieldReferenceExpression.TargetObject>

????????????????????????????????? </ns0:CodeFieldReferenceExpression>

??????????????????????????? </ns0:CodeBinaryOperatorExpression.Left>

??????????????????????????? <ns0:CodeBinaryOperatorExpression.Right>

????????????????????????????????? <ns0:CodePrimitiveExpression>

?????????????????????????????????????? <ns0:CodePrimitiveExpression.Value>

???????????????????????????????????????????? <ns1:String xmlns:ns1="clr-namespace:System;Assembly=mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">wxd</ns1:String>

?????????????????????????????????????? </ns0:CodePrimitiveExpression.Value>

????????????????????????????????? </ns0:CodePrimitiveExpression>

??????????????????????????? </ns0:CodeBinaryOperatorExpression.Right>

????????????????????? </ns0:CodeBinaryOperatorExpression>

???????????????? </RuleExpressionCondition.Expression>

?????????? </RuleExpressionCondition>

????? </RuleDefinitions.Conditions>

</RuleDefinitions>

Wraps an Activity whose execution is initialized by an event. This class cannot be inherited.

包裝一個(gè) Activity 執(zhí)行，執(zhí)行一個(gè)事件對(duì)其初使化

The EventDrivenActivity is a CompositeActivity, meaning the EventDrivenActivity can contain other activities. The EventDrivenActivity is similar to the SequenceActivity activity, with some additional characteristics.

An EventDrivenActivity must have a parent that is either a ListenActivity, StateActivity, or StateMachineWorkflowActivity.

?EventDrivenActivity 是 CompositeActivity,表示EventDrivenActivity??? 能包含其他Avtivity，

他與SequenceActivity相似,很多額外的特征

EventDrivenActivity必需有一個(gè)ListenActivity, StateActivity, or StateMachineWorkflowActivity.作為父容器

The first child of an EventDrivenActivity activity must be an activity that inherits from IEventActivity. All subsequent children can be activities of any type. The IEventActivity blocks the pending occurrence of some events, such as starting a timer or the arrival of a message. When the event occurs, the IEventActivity finishes running, and then all subsequent activities are executed.

?EventDrivenActivity第一個(gè)子結(jié)點(diǎn)必需是一個(gè)繼承 IEventActivity接口的Activity,

后面所有的結(jié)點(diǎn)可以是任意Activity。 IEventActivity 阻塞一些沒(méi)解決的狀態(tài)，如一個(gè)時(shí)間狀態(tài)或一個(gè)外部消息的到來(lái)。當(dāng)event完成，IeventActivity 完成運(yùn)行，后面所有的Activity將執(zhí)行

When the StateMachineWorkflow contains an EventDrivenActvity, the EventDrivenActivity has some restrictions. The EventDrivenActivity may contain one, and only one, activity of type IEventActivity, and the HandleExternalEventActivity must be the first child activity. (An HandleExternalEventActivity cannot be in the event handler for a child activity and cannot be a child to the EventDrivenActivity if the HandleExternalEventActivity is not the first child.) As long as the first activity is the HandleExternalEventActivity, the event handler can contain any activities. If an activity other than HandleExternalEventActivity is contained in EventDrivenActivity, that activity cannot have an event handler.

當(dāng)狀態(tài)機(jī)工作流包含一個(gè)EventDrivenActvity,這個(gè)EventDrivenActvity會(huì)有一些限制。

EventDrivenActivity ?可以包含并且只能包含一個(gè)類開(kāi)為 IEventActivity 的Activity.

并且 HandleExternalEventActivity 必須是第一個(gè)結(jié)點(diǎn).(一個(gè)HandleExternalEventActivity不能被添加到

event handler里，不能被放入EventDrivenActivity 如果HandleExternalEventActivity 不是第一個(gè)結(jié)點(diǎn))

只要HandleExternalEventActivity是第一個(gè)結(jié)點(diǎn),event handler能包含任意Activity,如果一個(gè)activity other 那么HandleExternalEventActivity 包含在EventDrivenActivity 里的,that activity 不能有event handler

For example, an activity that supports event handling can be used inside the EventDrivenActivity but the activity cannot have event handlers attached to itself.

Another example is that the EventDrivenActivity can contain a ConditionedActivityGroup, but the ConditionedActivityGroup itself cannot contain any HandleExternalEventActivity classes.

例如:一個(gè)提供 event handling的Activity,可以放到EventDrivenActivity 里,但這個(gè)activity不能有event handlers綁定到他自身

Represents a section of workflow that requires controlled access to shared variables. If two or more instances of a SynchronizationScopeActivity access the same variables, then the execution of these activities is effectively serialized. This class cannot be inherited.

表示一個(gè)workflow部分，that 請(qǐng)求管理進(jìn)入靜態(tài)變量，如果多個(gè)實(shí)例of a SynchronizationScopeActivity 請(qǐng)求變量 ,當(dāng)執(zhí)行這些Activity時(shí)，是一個(gè)有效的連續(xù)

System.Collections.Generic.List<string> stringcollection1 = new System.Collections.Generic.List<string>();

System.Collections.Generic.List<string> stringcollection2 = new System.Collections.Generic.List<string>();

System.Collections.Generic.List<string> stringcollection3 = new System.Collections.Generic.List<string>();

stringcollection1.Add("wxwinter");

this.syn3.SynchronizationHandles = stringcollection1;

?stringcollection2.Add("wxwinter");

this.syn2.SynchronizationHandles = stringcollection2;

stringcollection3.Add("wxwinter");

this.syn1.SynchronizationHandles = stringcollection3;

可以將多組分組字符加入SynchronizationHandles屬性，具有相同分組字符的SynchronizationScopeActivity不會(huì)同時(shí)執(zhí)行

??????? void replicatorActivity1_ChildInitialized(object sender, ReplicatorChildEventArgs e)

??????? {

?????????? 子控件 obj = (子控件)e.Activity;

??????????? obj.標(biāo)記數(shù)據(jù)屬性 = (string)e.InstanceData;

??????? }

e.Activity

代表當(dāng)前子Activity 實(shí)例的引用，通過(guò)這個(gè)對(duì)象可以訪問(wèn)子Activity 中的屬性

e.InstanceData

就是CurrentChildData 屬性,它是IList對(duì)象

運(yùn)行時(shí)刻每建立一個(gè)子Activity 的實(shí)例，就會(huì)從這個(gè)IList中取出一個(gè)對(duì)象作為該實(shí)例使用的數(shù)據(jù)

上例中的[標(biāo)記數(shù)據(jù)屬性]是子控件中定義的一個(gè)屬性,使用這種方式將不同的參數(shù)傳入每個(gè)子控件實(shí)例的內(nèi)部

replicatorActivity會(huì)跟據(jù)CurrentChildData 屬性中的項(xiàng)個(gè)數(shù)，自動(dòng)建立與之對(duì)應(yīng)個(gè)數(shù)的子控件實(shí)例，并把項(xiàng)依次分配給每個(gè)子控件實(shí)例

?????? void replicatorActivity1_ChildCompleted(object sender, ReplicatorChildEventArgs e)

??????? {

??????????? 子控件 obj = (子控件)e.Activity;

??????????? 結(jié)果列表.Add(obj.投票數(shù)據(jù).投票人 + obj.投票數(shù)據(jù).結(jié)果 + obj.投票數(shù)據(jù).投票時(shí)間);

??????? }

e.Activity

代表當(dāng)前子Activity 實(shí)例的引用，通過(guò)這個(gè)對(duì)象可以訪問(wèn)子Activity 中的屬性

e.InstanceData

對(duì)應(yīng)ChildInitialized事件所分配的值