If.Condition 屬性

定義

命名空間:

System.Activities.Statements

組件:

System.Activities.dll

判斷要執行哪個子活動的條件。 如果條件解析為 true，則 Then 活動會執行。 如果條件解析為 false，則 Else 活動會執行。

public:
 property System::Activities::InArgument<bool> ^ Condition { System::Activities::InArgument<bool> ^ get(); void set(System::Activities::InArgument<bool> ^ value); };

[System.Activities.RequiredArgument]
public System.Activities.InArgument<bool> Condition { get; set; }

[<System.Activities.RequiredArgument>]
member this.Condition : System.Activities.InArgument<bool> with get, set

Public Property Condition As InArgument(Of Boolean)

屬性值

InArgument<Boolean>

執行條件。

屬性

RequiredArgumentAttribute

範例

下列程式碼範例將示範如何設定 If 活動的 Condition 屬性。

new If
{
    // check if the order is asking for Widgets
    Condition = new InArgument<bool>( (e) => po.Get(e).PartName.Equals("Widget") ),
    Then = new If
    {
        // check if we have enough widgets in stock
        Condition = new InArgument<bool>( (e) => po.Get(e).Quantity < 100 ),
        Then = new SendReply
        {
            DisplayName = "Successful response",
            Request = submitPO,
            Content = SendContent.Create(new InArgument<string>( (e) => string.Format("Success: {0} Widgets have been ordered!", po.Get(e).Quantity)) )
        },
        // if we don't have enough widgets, throw an unhandled exception from this operation's body
        Else = new Throw
        {
            Exception = new InArgument<Exception>((e) => new Exception("We don't have that many Widgets."))
        }
    },
    // if its not for widgets, reply to the client that we don't carry that part by sending back an expected fault type (POFault)
    Else = new SendReply
    {
        DisplayName = "Expected fault",
        Request = submitPO,
        Content = SendContent.Create(new InArgument<FaultException<POFault>>( (e) => new FaultException<POFault>(
            new POFault
            {
                Problem = string.Format("This company does not carry {0}s, but we do carry Widgets.", po.Get(e).PartName),
                Solution = "Try your local hardware store."
            },
            new FaultReason("This is an expected fault.")
            )))
    }
}