Revit API共享参数的使用

共享参数相当于为某一类别元素增加一个额外的参数。
需要读取值的时候，就当作普通参数值来读。
这里仅仅把读取共享参数文件，然后绑定到某一类别的代码贴出来。
API创建组，创建参数具体代码详见源码。

[Transaction(TransactionMode.Manual)]
[Regeneration(RegenerationOption.Manual)]
public class Command4 : IExternalCommand
{
    public Result Execute(ExternalCommandData cmdData, ref string message, ElementSet elements)
    {
        UIDocument uiDoc = cmdData.Application.ActiveUIDocument;
        Selection selection = uiDoc.Selection;

        Transaction ts = new Transaction(uiDoc.Document, "LevelDuct");
        ts.Start();

        //打开文件
        cmdData.Application.Application.SharedParametersFilename = @"C:\Users\HongYe\Desktop\RevitParameters.txt";
        DefinitionFile sharedParametersFile = cmdData.Application.Application.OpenSharedParameterFile();
        //绑定到类别
        CategorySet categories = null;
        categories = cmdData.Application.Application.Create.NewCategorySet();
        Category wallCategory = null;
        //wallCategory = commandData.Application.ActiveUIDocument.Document.Settings.Categories.get_Item("Walls");
        wallCategory = cmdData.Application.ActiveUIDocument.Document.Settings.Categories.get_Item("墙");

        categories.Insert(wallCategory);

        InstanceBinding instanceBinding = null;
        instanceBinding = cmdData.Application.Application.Create.NewInstanceBinding(categories);
        //参数
        //参数分组
        Autodesk.Revit.DB.DefinitionGroup sharedParameterGroup = null;
        sharedParameterGroup = sharedParametersFile.Groups.get_Item("RevitParameters");
        if (null == sharedParameterGroup)
        {
            sharedParameterGroup = sharedParametersFile.Groups.Create("RevitParameters");
        }
        //参数值
        Definition sharedParameterDefinition = null;
        sharedParameterDefinition = sharedParameterGroup.Definitions.get_Item("APIParameter");
        if (sharedParameterDefinition == null)
        {
            sharedParameterDefinition = sharedParameterGroup.Definitions.Create("APIParameter", ParameterType.Text, true);
        }

        cmdData.Application.ActiveUIDocument.Document.ParameterBindings.Insert(sharedParameterDefinition, instanceBinding);

        ts.Commit();

        return Result.Succeeded;
    }
}

更多示例源码：http://revit.5d6d.com/thread-1305-1-1.html