While 类

定义

public ref class While sealed : System::Activities::NativeActivity

[System.Windows.Markup.ContentProperty("Body")]
public sealed class While : System.Activities.NativeActivity

[<System.Windows.Markup.ContentProperty("Body")>]
type While = class
    inherit NativeActivity

Public NotInheritable Class While
Inherits NativeActivity

继承

Object

Activity

NativeActivity

While

属性

ContentPropertyAttribute

示例

下面的代码示例演示如何创建 While 活动。

new While
{
    Condition = true,
    Body = new Receive
    {
        ServiceContractName = Constants.POContractName,
        OperationName = Constants.UpdatePOName,
        CorrelatesWith = poidHandle, // identifies that the UpdatePO operation is waiting on the PurchaseOrderId that was used to initialize this handle
        CorrelatesOn = new MessageQuerySet // the query that is used on an incoming message to find the requisite PurchaseOrderId specified in the correlation
        {
            // Id is the name of the incoming parameter within the PurchaseOrder
            { "PoId", new XPathMessageQuery("sm:body()/defns:PurchaseOrder/defns:Id", Constants.XPathMessageContext) }
        },
        Content = ReceiveContent.Create(new OutArgument<PurchaseOrder>(po)) // creates a ReceiveMessageContent
    }
},