public override object ProvideValue(IServiceProvider serviceProvider)
{
if (!string.IsNullOrEmpty(this.PropertyName))
{
object rootTemplatedActivity = ActivityWithResultConverter.GetRootTemplatedActivity(serviceProvider);
if (rootTemplatedActivity != null)
{
PropertyDescriptor descriptor = TypeDescriptor.GetProperties(rootTemplatedActivity)[this.PropertyName];
if (descriptor != null)
{
return(descriptor.GetValue(rootTemplatedActivity));
}
}
}
throw FxTrace.Exception.AsError(new InvalidOperationException(System.Activities.SR.PropertyReferenceNotFound(this.PropertyName)));
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (!string.IsNullOrEmpty(this.PropertyName))
{
object targetObject = ActivityWithResultConverter.GetRootTemplatedActivity(serviceProvider);
if (targetObject != null)
{
PropertyDescriptor property = TypeDescriptor.GetProperties(targetObject)[PropertyName];
if (property != null)
{
return(property.GetValue(targetObject));
}
}
}
throw FxTrace.Exception.AsError(
new InvalidOperationException(SR.PropertyReferenceNotFound(this.PropertyName)));
}
static bool TryEvaluateExpression(
string expressionString,
Type locationValueType, // Non null for Reference type (location)
LocationReferenceEnvironment locationReferenceEnvironment,
CodeActivityContext context,
out object result)
{
expressionString = string.Format(CultureInfo.InvariantCulture, "[{0}]", expressionString);
Type activityType;
if (locationValueType != null)
{
activityType = typeof(Activity<>).MakeGenericType(typeof(Location<>).MakeGenericType(locationValueType));
}
else
{
activityType = typeof(Activity<object>);
}
// General expression.
ActivityWithResultConverter converter = new ActivityWithResultConverter(activityType);
ActivityWithResult expression = converter.ConvertFromString(
new TypeDescriptorContext { LocationReferenceEnvironment = locationReferenceEnvironment },
expressionString) as ActivityWithResult;
if (locationValueType != null)
{
Type locationHelperType = typeof(LocationHelper<>).MakeGenericType(locationValueType);
LocationHelper helper = (LocationHelper)Activator.CreateInstance(locationHelperType);
return helper.TryGetValue(expression, locationReferenceEnvironment, context, out result);
}
else
{
return TryEvaluateExpression(expression, locationReferenceEnvironment, context, out result);
}
}
