读取参数类型是一个对象的参数值
Revit的参数类型包含很多，比如下面列表所示。Text
The parameter data should be interpreted as a string of text.
Integer
The parameter data should be interpreted as a whole number, positive or negative.
Number
The parameter data should be interpreted as a real number, possibly including decimal points.
Length
The parameter data represents a length.
Area
The parameter data represents an area.
Volume
The parameter data represents a volume.
Angle
The parameter data represents an angle.
URL
A text string that represents a web address.
Material
The value of this property is considered to be a material.
YesNo
A boolean value that will be represented as Yes or No.
Force
The data value will be represented as a force.
LinearForce
The data value will be represented as a linear force.
AreaForce
The data value will be represented as an area force.
Moment
The data value will be represented as a moment.
NumberOfPoles
A parameter value that represents the number of poles, as used in electrical disciplines.
FixtureUnit
A parameter value that represents the fixture units, as used in piping disciplines.
FamilyType
A parameter used to control the type of a family nested within another family.
其中我们看到有的是Material型，或FamilyType型。
对于字符串，整形，长度（double）型，我们可以分别通过Parameter.AsString(), Parameter.AsInteger(), AsDouble()等来访问。
那么如果是Material类型的，怎么获取具体这个材料是什么呢？ 此时存在在参数中的实际上是一个元素id即ElementId。
可以用Parameter.AsElementId()方法获得元素Id，然后用Document.get_Element(ElementId id) 方法获取这个材料对象。
请看下面的代码获取柱子的材料，并在任务框上显示材料名称。
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public class RevitCommand : IExternalCommand
{
public Result Execute(ExternalCommandData commandData, ref string messages, ElementSet elements)
{
UIApplication app = commandData.Application;
Document doc = app.ActiveUIDocument.Document;
//pick the column,
Selection sel = app.ActiveUIDocument.Selection;
Reference ref1 = sel.PickObject(ObjectType.Element, "Please pick a column to get its Materai parameter value");
Element elem = ref1.Element;
// the material parameter name for column is "Column Material"
Parameter param = room.get_Parameter("Column Material");
ElementId idMaterial = param.AsElementId();
Material mat = doc.get_Element(idMaterial) as Material;
MessageBox.Show("The material name is" + mat.Name);
return Result.Succeeded ;
}
}这个方法可以获取任何参数值是其它Revit对象的参数值。
作者：叶雄进文章来源：http://blog.csdn.net/joexiongjin/article/category/782739
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