ValueTypeFieldReference<TOperand,TResult> Classe

Definizione

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

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

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

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

Parametri di tipo

Ereditarietà

Object

Activity

ActivityWithResult

Activity<TResult>

CodeActivity<Location<TResult>>

ValueTypeFieldReference<TOperand,TResult>

Esempio

L'esempio di codice seguente usa ValueTypeFieldReference<TOperand,TResult> in un'attività Assign per assegnare un valore intero a un campo e stampa il valore del campo nella console. L'attività Assign equivale all'istruzione seguente quando si usa l'oggetto struct definito nell'esempio seguente. myStructVariable.AField = 1;.

// Define a struct with a field named AField.
struct StructWithField
{
    public int AField;
}

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

    Activity myActivity = new Sequence
    {
        Variables = { swfvar },
        Activities =
        {
            // Create an Assign activity to assign a value to the AField field.
            new Assign<int>
            {
                To = new ValueTypeFieldReference<StructWithField, int>()
                {
                    OperandLocation = swfvar,
                    FieldName = "AField",
                },
                // Assign an integer value to AField.
                Value = 1,
            },
            // Print the new field value to the console.
            new WriteLine()
            {
                Text = ExpressionServices.Convert<string>(ctx => swfvar.Get(ctx).AField.ToString()),
            }
        }
    };

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