public static void ValidateReferenceExpressionXaml <T>(TestExpression te)
{
Expression <Func <ActivityContext, T> > lambdaExpression = (Expression <Func <ActivityContext, T> >)te.CreateLambdaExpresson <T>();
//Log.TraceInternal("Expression: {0}", lambdaExpression.ToString());
Activity expectedActivity = te.CreateExpectedActivity() as Activity;
Activity actualActivity = ExpressionServices.ConvertReference(lambdaExpression);
ValidateActivity(expectedActivity, actualActivity);
}
public static Activity <Location <TResult> > ConvertReference <TResult>(Expression <Func <ActivityContext, TResult> > expression, Exception expectedException)
{
Activity <Location <TResult> > result = null;
if (expectedException != null)
{
ExceptionHelpers.CheckForException(
expectedException.GetType(), expectedException.Message,
() => { result = ExpressionServices.ConvertReference <TResult>(expression); }, true);
}
else
{
result = ExpressionServices.ConvertReference <TResult>(expression);
}
return(result);
}
public override Sequence CreateActualWorkflow <TResult>()
{
Expression <Func <ActivityContext, TResult> > lambdaExpression = Expression.Lambda <Func <ActivityContext, TResult> >(this.CreateLinqExpression(), TestExpression.EnvParameter);
Activity <Location <TResult> > we = ExpressionServices.ConvertReference(lambdaExpression);
Sequence sequence = new Sequence()
{
Activities =
{
new Assign <TResult>()
{
Value = (TResult)FromValue,
To = we
},
new WriteLine()
{
Text = new InArgument <string>(ToExpression)
}
}
};
return(sequence);
}
private Activity CreateXamlSerializableCodeWorkflow()
{
Variable <Employee> e1 = new Variable <Employee> {
Name = "Employee1", Default = ExpressionServices.Convert <Employee>(ctx => new Employee("John", "Doe", 55000.0))
};
Variable <Employee> e2 = new Variable <Employee> {
Name = "Employee2", Default = ExpressionServices.Convert <Employee>(ctx => new Employee("Frank", "Kimono", 89000.0))
};
Variable <SalaryStats> stats = new Variable <SalaryStats> {
Name = "SalaryStats", Default = ExpressionServices.Convert <SalaryStats>(ctx => new SalaryStats())
};
Variable <Double> v1 = new Variable <double>();
// Lambda expressions do not serialize to XAML. ExpressionServices utility class can be used to
// convert them to operator activities, which do serialize to XAML.
// ExpressionServices.Convert applies to r-values, which cannot be assigned to.
// ExpressionServices.ConvertReference applies to l-values, which can be the target of an assignment.
// Note that conversion is supported for a limited set of lambda expressions only.
Sequence workflow = new Sequence()
{
Variables =
{
e1, e2, stats, v1,
},
Activities =
{
new WriteLine()
{
Text = ExpressionServices.Convert <string>(ctx => e1.Get(ctx).FirstName + " " + e1.Get(ctx).LastName + " earns " + e1.Get(ctx).Salary.ToString("$0.00")),
},
new WriteLine()
{
Text = ExpressionServices.Convert <string>(ctx => e2.Get(ctx).FirstName + " " + e2.Get(ctx).LastName + " earns " + e2.Get(ctx).Salary.ToString("$0.00")),
},
new Assign <double>()
{
To = ExpressionServices.ConvertReference <double>(ctx => stats.Get(ctx).MinSalary),
Value = ExpressionServices.Convert <double>(ctx => Math.Min(e1.Get(ctx).Salary, e2.Get(ctx).Salary))
},
new Assign <double>()
{
To = ExpressionServices.ConvertReference <double>(ctx => stats.Get(ctx).MaxSalary),
Value = ExpressionServices.Convert <double>(ctx => Math.Max(e1.Get(ctx).Salary, e2.Get(ctx).Salary))
},
new Assign <double>()
{
To = ExpressionServices.ConvertReference <double>(ctx => stats.Get(ctx).AvgSalary),
Value = ExpressionServices.Convert <double>(ctx => (e1.Get(ctx).Salary + e2.Get(ctx).Salary) / 2.0)
},
new WriteLine()
{
Text = ExpressionServices.Convert <string>(ctx => String.Format(
"Salary statistics: minimum salary is {0:$0.00}, maximum salary is {1:$0.00}, average salary is {2:$0.00}",
stats.Get(ctx).MinSalary, stats.Get(ctx).MaxSalary, stats.Get(ctx).AvgSalary))
}
},
};
return(workflow);
}