public ViewDataInfo Eval(string expression)
{
ViewDataInfo evaluated = EvalComplexExpression(
_dictionary, expression);
return(evaluated);
}
private static ViewDataInfo EvalComplexExpression(object instance, string expression)
{
foreach (ExpressionPair pair in GetRightToLeftExpressions(expression))
{
string subExpression = pair.Left;
string postExpression = pair.Right;
ViewDataInfo subTarget = GetPropertyValue(instance, subExpression);
if (subTarget != null)
{
if (String.IsNullOrEmpty(postExpression))
{
return(subTarget);
}
if (subTarget.Value != null)
{
ViewDataInfo potential =
EvalComplexExpression(subTarget.Value, postExpression);
if (potential != null)
{
return(potential);
}
}
}
}
return(null);
}
protected string Template(string expression, string templateName,
string htmlElementName, DataBoundControlMode mode)
{
Type containerType = null;
Type modelType = null;
object modelValue = null;
string propertyName = null;
ViewDataInfo vdi = Context.ViewData.GetViewDataInfo(expression);
if (vdi != null)
{
containerType = vdi.Container.GetType();
if (vdi.Descriptor != null)
{
propertyName = vdi.Descriptor.Name;
modelType = vdi.Descriptor.PropertyType;
}
modelValue = vdi.Value;
if (modelValue != null)
{
modelType = modelValue.GetType();
}
}
return(Render(mode, templateName, htmlElementName ?? expression,
containerType, modelType ?? typeof(string), propertyName, modelValue));
}
private ModelValidatorSet GetValidatorsFromExpression(string expression)
{
if (String.IsNullOrEmpty(expression))
{
return(new ModelValidatorSet(Context.ViewData.Validator));
}
ViewDataInfo vdi = Context.ViewData.GetViewDataInfo(expression);
if (vdi == null)
{
return(new ModelValidatorSet());
}
Type containerType = null;
Type modelType = null;
string propertyName = null;
object model = vdi.Value;
if (vdi.Container != null)
{
containerType = vdi.Container.GetType();
}
if (vdi.Descriptor != null)
{
propertyName = vdi.Descriptor.Name;
modelType = vdi.Descriptor.PropertyType;
}
if (model != null && modelType == null)
{
modelType = model.GetType();
}
return(GetValidatorsFromProvider(containerType, modelType ?? typeof(string), propertyName));
}
private static ViewDataInfo GetPropertyValue(object container, string propertyName)
{
ViewDataInfo value = GetIndexedPropertyValue(container, propertyName);
if (value != null)
{
return(value);
}
ViewDataDictionary vdd = container as ViewDataDictionary;
if (vdd != null)
{
container = vdd.Model;
}
if (container == null)
{
return(null);
}
PropertyDescriptor descriptor = TypeDescriptor.GetProperties(container)
.Find(propertyName, true);
if (descriptor == null)
{
return(null);
}
return(new ViewDataInfo()
{
Container = container,
Descriptor = descriptor,
Value = descriptor.GetValue(container)
});
}
