LoadCombination.GetCaseAndCombinationIds

Public Class

Returns collection of the load combination case and combination IDs.

Namespace: Autodesk.Revit.DB.Structure

Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)

Syntax

public IList<ElementId> GetCaseAndCombinationIds()

Return Value

IList. ElementId.
A collection of the load combination case and combination IDs.

Remarks

Load combination components could be load cases or other load combinations. To set them with factors use [M:Autodesk.Revit.DB.Structure.LoadCombination.SetComponents(System.Collections.Generic.IList`1{Autodesk.Revit.DB.Structure.LoadComponent})] method.

Example

#region Autodesk.Revit.DB.Structure.LoadCombination.GetComponents()
#region Autodesk.Revit.DB.Structure.LoadCombination.GetUsageIds()
void ModifyLoadCombinationLoadCaseLoadUsageLoadNatureAndLoadComponent(Document document, LoadCombination loadCombination)
{
    // Change name of LoadCombination
    loadCombination.Name = "DL2 + RAIN1";

    // Get any LoadCase from combination
    // Combination can have assigned LoadCase or other (nested) LoadCombination so we need to filter out any LoadCombination
    LoadCase case1 = null;
    IList<ElementId> caseAndCombinationIds = loadCombination.GetCaseAndCombinationIds();
    foreach (ElementId id in caseAndCombinationIds)
    {
        Element element = document.GetElement(id);
        if (element is LoadCase)
        {
           case1 = (LoadCase)element;
           break;
        }
        else if (element is LoadCombination)
        {
           continue;
        }
    }

    if (case1 == null)
       throw new Exception("Can't get LoadCase.");

    // Change case name and number
    case1.Name = "DL2";
    if (LoadCase.IsNumberUnique(document, 3))
    {
        case1.Number = 3;
    }

    // Create load nature
    LoadNature liveNature = LoadNature.Create(document, "Dead nature");
    if (liveNature == null)
       throw new Exception("Create new load nature failed.");

    // Change nature category, ID and number for case
    case1.SubcategoryId = new ElementId(BuiltInCategory.OST_LoadCasesDead);
    case1.NatureId = liveNature.Id;

    //Change factor for case1
    IList<LoadComponent> components = loadCombination.GetComponents();
    foreach (LoadComponent loadComponent in components)
    {
        if (loadComponent.LoadCaseOrCombinationId == case1.Id)
        {
            loadComponent.Factor = 3.0;
        }
    }

    loadCombination.SetComponents(components);

    // Remove one usage from combination
    IList<ElementId> usages = loadCombination.GetUsageIds();
    usages.RemoveAt(0);
    loadCombination.SetUsageIds(usages);

    // Give the user some information
    TaskDialog.Show("Revit", string.Format("Load Combination ID='{0}' modified successfully.", loadCombination.Id.ToString()));
}
#endregion
#endregion