private static void GetVariableValue(ObjectId variableId,
ref string name,
ref ResultBuffer value,
ref string expression)
{
using (Transaction Tx =
variableId.Database.TransactionManager.StartTransaction())
{
AssocVariable var =
Tx.GetObject(variableId, OpenMode.ForRead)
as AssocVariable;
name = var.Name;
var.EvaluateExpression(ref value);
expression = var.Expression;
Tx.Commit();
}
}
///<Summary>
/// Set Expression for Given variableId
///</Summary>
///
private static void SetVariableValue(ObjectId variableId,
ResultBuffer value,
string expression)
{
using (Transaction Tx =
variableId.Database.TransactionManager.StartTransaction())
{
AssocVariable var =
Tx.GetObject(variableId, OpenMode.ForWrite)
as AssocVariable;
if (expression != string.Empty)
{
string errMsg = string.Empty;
var.ValidateNameAndExpression(
var.Name,
expression,
ref errMsg);
var.SetExpression(
expression, "", true, true, ref errMsg, true);
ResultBuffer evaluatedExpressionValue = null;
var.EvaluateExpression(ref evaluatedExpressionValue);
var.Value = evaluatedExpressionValue;
}
else
{
var.Value = value;
}
Tx.Commit();
}
}
///<Summary>
/// Get Variable Name for Given variableId
///</Summary>
///
private static ObjectId GetVariableByName(ObjectId btrId,
string name,
bool createIfDoesNotExist)
{
if (name.Length == 0)
{
throw new Autodesk.AutoCAD.Runtime.Exception(
ErrorStatus.InvalidInput);
}
ObjectId networkId = AssocNetwork.GetInstanceFromObject(
btrId,
createIfDoesNotExist,
true,
"ACAD_ASSOCNETWORK");
if (networkId == ObjectId.Null)
{
return(ObjectId.Null);
}
using (Transaction Tx =
btrId.Database.TransactionManager.StartTransaction())
{
using (AssocNetwork network =
Tx.GetObject(networkId, OpenMode.ForRead, false)
as AssocNetwork)
{
foreach (ObjectId actionId in network.GetActions)
{
if (actionId == ObjectId.Null)
{
continue;
}
if (actionId.ObjectClass.IsDerivedFrom(
RXObject.GetClass(typeof(AssocVariable))))
{
//Check if we found our guy
AssocVariable var = Tx.GetObject(actionId,
OpenMode.ForRead,
false)
as AssocVariable;
if (var.Name == name)
{
return(actionId);
}
}
}
}
}
//If we don't want to create a new variable, returns an error
if (!createIfDoesNotExist)
{
return(ObjectId.Null);
}
return(ObjectId.Null);//We didnt find what we are looking
}
