ValueTypeFieldReference<TOperand,TResult> Klasse

Definition

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))

Typparameter

Vererbung

Object

Activity

ActivityWithResult

Activity<TResult>

CodeActivity<Location<TResult>>

ValueTypeFieldReference<TOperand,TResult>

Beispiele

Im folgenden Codebeispiel wird ValueTypeFieldReference<TOperand,TResult> in einer Assign Aktivität ein ganzzahliger Wert einem Feld zugewiesen und der Konsole der Feldwert gedruckt. Die Assign Aktivität entspricht der folgenden Anweisung, wenn sie das struct im folgenden Beispiel definierte Beispiel verwendet. 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);
}