ValueTypePropertyReference<TOperand,TResult> Classe

Definizione

generic <typename TOperand, typename TResult>
public ref class ValueTypePropertyReference sealed : System::Activities::CodeActivity<System::Activities::Location<TResult> ^>

public sealed class ValueTypePropertyReference<TOperand,TResult> : System.Activities.CodeActivity<System.Activities.Location<TResult>>

type ValueTypePropertyReference<'Operand, 'Result> = class
    inherit CodeActivity<Location<'Result>>

Public NotInheritable Class ValueTypePropertyReference(Of TOperand, TResult)
Inherits CodeActivity(Of Location(Of TResult))

Parametri di tipo

Ereditarietà

Object

Activity

ActivityWithResult

Activity<TResult>

CodeActivity<Location<TResult>>

ValueTypePropertyReference<TOperand,TResult>

Esempio

Nell'esempio di codice seguente viene ValueTypePropertyReference<TOperand,TResult> utilizzato in un'attività Assign per assegnare un string valore a una proprietà e viene stampato il valore della proprietà nella console. L'attività Assign equivale all'istruzione seguente quando si usa l'oggetto struct definito nell'esempio seguente: myStructVariable.AProperty = "Hello";.

// Define a struct with a property named AProperty.
struct StructWithProperty
{
    public string AProperty { get; set; }
}

public static void ValueTypePropertyReferenceSample()
{
    // Create a variable of type StructWithProperty to store the property.
    var swpvar = new Variable<StructWithProperty>("swpvar", new StructWithProperty());

    // Create the top-level activity to be invoked later.
    Activity myActivity = new Sequence
    {
        Variables = { swpvar },
        Activities =
        {
            // Create an Assign activity for a property named AProperty.
            new Assign<string>
            {
                To = new ValueTypePropertyReference<StructWithProperty, string>
                {
                    OperandLocation = swpvar,
                    PropertyName = "AProperty",
                },
                // Assign a string literal to AProperty.
                Value = "Hello",
            },
            // Create a WriteLine activity to write the value of AProperty to the console.
            new WriteLine()
            {
                Text = ExpressionServices.Convert<string>(ctx => swpvar.Get(ctx).AProperty),
            }
        }
    };

    // Invoke the Sequence activity.
    WorkflowInvoker.Invoke(myActivity);
}