Tests whether global parameters are allowed in the given document. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0) 
  Since:  2016 Subscription Update 
Syntax
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Parameters
- document
 -  Type:  Autodesk.Revit.DB Document  
A revit document of interest. 
Remarks
 First of all, global parameters can be had in main project documents only; they are not supported in family documents. However, there may also be other circumstances due to which global parameters may be disallowed in a particular project, either temporarily or permanently. 
 Examples
/// <summary>
/// Tests whether there are any global parameters present in the given document 
/// </summary>
/// <param name="document">Revit project document.</param>
/// <returns>A set of ElementIds of global parameter elements</returns>
public bool ContainsGlobalParameters(Document document)
{
    // Global parameters are not available in all documents.
    // They are available in projects, but not in families.
    if (GlobalParametersManager.AreGlobalParametersAllowed(document))
    {
        return (GlobalParametersManager.GetAllGlobalParameters(document).Count > 0);
    }
    return false;
} Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |