Walkthrough: Get Selected Element Parameters

void GetElementParameterInformation(Document document, Element element)
{
	// Format the prompt information string
	String prompt = "Show parameters in selected Element:";
	
	StringBuilder st = new StringBuilder();
	// iterate element's parameters
	foreach (Parameter para in element.Parameters)
	{
		st.AppendLine(GetParameterInformation(para, document));
	}
	
	// Give the user some information
	MessageBox.Show(prompt, "Revit", MessageBoxButtons.OK);
}

	String GetParameterInformation(Parameter para, Document document)
{
	string defName = para.Definition.Name + @"\t";
	// Use different method to get parameter data according to the storage type
	switch (para.StorageType)
	{
		case StorageType.Double:
			//covert the number into Metric
			defName += " : " + para.AsValueString();
			break;
		case StorageType.ElementId:
			//find out the name of the element
			ElementId id = para.AsElementId();
			if (id.Value >= 0)
			{
				defName += " : " + document.GetElement(ref id).Name;
			}
			else
			{
				defName += " : " + id.Value.ToString();
			}
			break;
		case StorageType.Integer:
			if (ParameterType.YesNo == para.Definition.ParameterType)
			{
				if (para.AsInteger() == 0)
				{
					defName += " : " + "False";
				}
				else
				{
					defName += " : " + "True";
				}
			}
			else
			{
				defName += " : " + para.AsInteger().ToString();
			}
			break;
		case StorageType.String:
			defName += " : " + para.AsString();
			break;
		default:
			defName = "Unexposed parameter.";
		break;
	}
	
	return defName;
}