public static void SetEvaluator(IEvaluatedNetworkAttribute netAttribute, INetworkSource netSource, Type t, esriNetworkEdgeDirection dirType)
{
object obj = Activator.CreateInstance(t);
INetworkEvaluator eval = obj as INetworkEvaluator;
netAttribute.set_Evaluator(netSource, dirType, eval);
}
/// <summary>Creates new network attribute parameters</summary>
private static void AddNetworkParameters(NetworkAttributeInfo nai, IEvaluatedNetworkAttribute netAttr)
{
// Create parameters
if ((nai.Parameters != null) && (nai.Parameters.Count > 0))
{
IArray naParams = new ArrayClass();
foreach (ParameterInfo paramInfo in nai.Parameters)
{
INetworkAttributeParameter nap = new NetworkAttributeParameterClass();
nap.Name = paramInfo.Name;
if (paramInfo.DefaultValue is double)
{
nap.VarType = (int)VarEnum.VT_R8;
}
else if (paramInfo.DefaultValue is bool)
{
nap.VarType = (int)VarEnum.VT_BOOL;
}
else if (paramInfo.DefaultValue is string)
{
nap.VarType = (int)VarEnum.VT_BSTR;
}
nap.DefaultValue = paramInfo.DefaultValue;
naParams.Add(nap);
}
((INetworkAttribute3)netAttr).Parameters = naParams;
}
}
private void btnAdd_Click(object sender, EventArgs e)
{
frmNewNetworkAttribute attribute = new frmNewNetworkAttribute();
if (attribute.ShowDialog() == DialogResult.OK)
{
string[] items = new string[]
{
"", "", attribute.NetworkAttribute.Name,
CommonHelper.GetUsageTypeDescriptor(attribute.NetworkAttribute.UsageType),
CommonHelper.GetNetworkUnitTypeDescriptor(attribute.NetworkAttribute.Units),
CommonHelper.GetDataTypeDescriptor(attribute.NetworkAttribute.DataType)
};
INetworkConstantEvaluator evaluator = new NetworkConstantEvaluatorClass();
IEvaluatedNetworkAttribute networkAttribute = attribute.NetworkAttribute as IEvaluatedNetworkAttribute;
evaluator.ConstantValue = 0;
networkAttribute.set_DefaultEvaluator(esriNetworkElementType.esriNETEdge, evaluator as INetworkEvaluator);
networkAttribute.set_DefaultEvaluator(esriNetworkElementType.esriNETJunction,
evaluator as INetworkEvaluator);
networkAttribute.set_DefaultEvaluator(esriNetworkElementType.esriNETTurn, evaluator as INetworkEvaluator);
ListViewItem item = new ListViewItem(items)
{
Tag = attribute.NetworkAttribute
};
this.listView1.Items.Add(item);
NewNetworkDatasetHelper.NewNetworkDataset.Attributes.Add(attribute.NetworkAttribute);
}
}
public static void SetDefaultEvaluator(IEvaluatedNetworkAttribute netAttribute, object defaultValue, esriNetworkElementType eType)
{
INetworkConstantEvaluator constEvaluator = new NetworkConstantEvaluatorClass();
constEvaluator.ConstantValue = defaultValue;
INetworkEvaluator eval = constEvaluator as INetworkEvaluator;
netAttribute.set_DefaultEvaluator(eType, eval);
}
public bool SupportsSource(INetworkSource source, IEvaluatedNetworkAttribute attribute)
{
// This custom evaluator supports added costs only for edges in attributes with units of Minutes
bool isEdgeSource = (source.ElementType == esriNetworkElementType.esriNETEdge);
bool isCostAttribute = (attribute.UsageType == esriNetworkAttributeUsageType.esriNAUTCost);
bool isMinutes = (attribute.Units == esriNetworkAttributeUnits.esriNAUMinutes);
return(isEdgeSource && isCostAttribute && isMinutes);
}
public static void SetEvaluators(IEvaluatedNetworkAttribute netAttribute, INetworkSource netSource, Type t)
{
esriNetworkElementType eType = netSource.ElementType;
if (eType == esriNetworkElementType.esriNETEdge)
{
SetEvaluator(netAttribute, netSource, t, esriNetworkEdgeDirection.esriNEDAlongDigitized);
SetEvaluator(netAttribute, netSource, t, esriNetworkEdgeDirection.esriNEDAgainstDigitized);
}
else
{
SetEvaluator(netAttribute, netSource, t, esriNetworkEdgeDirection.esriNEDNone);
}
}
public bool ValidateDefault(esriNetworkElementType elementType, IEvaluatedNetworkAttribute attribute, ref int errorCode, ref string errorDescription, ref string errorAppendInfo)
{
if (SupportsDefault(elementType, attribute))
{
errorCode = 0;
errorDescription = errorAppendInfo = string.Empty;
return(true);
}
else
{
errorCode = -1;
errorDescription = errorAppendInfo = string.Empty;
return(false);
}
}
/// <summary>Creates new network attribute parameters</summary>
private static void AddNetworkParameters(NetworkAttributeInfo nai, IEvaluatedNetworkAttribute netAttr)
{
// Create parameters
if ((nai.Parameters != null) && (nai.Parameters.Count > 0))
{
IArray naParams = new ArrayClass();
foreach (ParameterInfo paramInfo in nai.Parameters)
{
INetworkAttributeParameter nap = new NetworkAttributeParameterClass();
nap.Name = paramInfo.Name;
if (paramInfo.DefaultValue is double)
nap.VarType = (int)VarEnum.VT_R8;
else if (paramInfo.DefaultValue is bool)
nap.VarType = (int)VarEnum.VT_BOOL;
else if (paramInfo.DefaultValue is string)
nap.VarType = (int)VarEnum.VT_BSTR;
nap.DefaultValue = paramInfo.DefaultValue;
naParams.Add(nap);
}
((INetworkAttribute3)netAttr).Parameters = naParams;
}
}
public void Initialize(INetworkDataset networkDataset, IDENetworkDataset dataElement, INetworkSource source, IEvaluatedNetworkAttribute attribute)
{
// Initialize is called once per session (ArcMap session, ArcCatalog session, etc.) to initialize the evaluator for an associated network dataset
Type t = Type.GetTypeFromProgID("esriFramework.AppRef");
try
{
// Activator.CreateInstance(t) is expected to error if the evaluator is created in an engine application
// which can�t get a reference to the AppRef singleton.
// This evaluator won�t work in Engine due to this design limitation. It is, however,
// fully functional in ArcMap.
System.Object obj = Activator.CreateInstance(t);
IApplication app = obj as IApplication;
if (app != null && app is IMxApplication)
m_mxDocument = app.Document as IMxDocument;
}
catch (Exception e)
{
m_mxDocument = null;
}
// Store reference to the network dataset and the network source
m_networkDataset = networkDataset;
m_networkSource = source;
// Create a new Dictionary hashtable for this network source
m_sourceHashTable = new Dictionary<int, int>();
}
public static void SetEvaluators(IEvaluatedNetworkAttribute netAttribute, INetworkSource netSource, Type t)
{
esriNetworkElementType eType = netSource.ElementType;
if (eType == esriNetworkElementType.esriNETEdge)
{
SetEvaluator(netAttribute, netSource, t, esriNetworkEdgeDirection.esriNEDAlongDigitized);
SetEvaluator(netAttribute, netSource, t, esriNetworkEdgeDirection.esriNEDAgainstDigitized);
}
else
{
SetEvaluator(netAttribute, netSource, t, esriNetworkEdgeDirection.esriNEDNone);
}
}
public bool ValidateDefault(esriNetworkElementType elementType, IEvaluatedNetworkAttribute attribute, ref int errorCode, ref string errorDescription, ref string errorAppendInfo)
{
if (SupportsDefault(elementType, attribute))
{
errorCode = 0;
errorDescription = errorAppendInfo = string.Empty;
return true;
}
else
{
errorCode = -1;
errorDescription = errorAppendInfo = string.Empty;
return false;
}
}
public void Initialize(INetworkDataset networkDataset, IDENetworkDataset DataElement, INetworkSource netSource, IEvaluatedNetworkAttribute netAttribute)
{
// Initialize is called once per session (ArcMap session, ArcCatalog session, etc.) to initialize the evaluator for an associated network dataset
m_networkDataset = networkDataset;
m_networkSource = netSource;
m_networkAttribute = netAttribute;
Refresh();
}
public bool SupportsSource(INetworkSource netSource, IEvaluatedNetworkAttribute netAttribute)
{
// This custom evaluator supports cost attributes for all sources
return(netAttribute.UsageType == esriNetworkAttributeUsageType.esriNAUTCost);
}
public void Initialize(INetworkDataset networkDataset, IDENetworkDataset DataElement, INetworkSource netSource, IEvaluatedNetworkAttribute netAttribute)
{
// Initialize is called once per session (ArcMap session, ArcCatalog session, etc.) to initialize the evaluator for an associated network dataset
m_networkDataset = networkDataset;
m_networkSource = netSource;
m_networkAttribute = netAttribute;
Refresh();
}
public bool SupportsSource(INetworkSource netSource, IEvaluatedNetworkAttribute netAttribute)
{
// This custom evaluator supports cost attributes for all sources
return netAttribute.UsageType == esriNetworkAttributeUsageType.esriNAUTCost;
}
public bool SupportsDefault(esriNetworkElementType ElementType, IEvaluatedNetworkAttribute netAttribute)
{
return false;
}
public void Initialize(INetworkDataset networkDataset, IDENetworkDataset DataElement, INetworkSource netSource, IEvaluatedNetworkAttribute netAttribute)
{
// Initialize is called once per session (ArcMap session, ArcCatalog session, etc.) to initialize the evaluator for an associated network dataset
m_networkDataset = networkDataset;
m_networkSource = netSource;
m_networkAttribute = netAttribute;
m_thisNetworkAttributeID = netAttribute.ID;
m_baseNetworkAttributeID = -1;
//The attribute name must begin with one or more non underscore characters followed by
//an underscore character and then the name of the base cost attribute.
//The underscore prior to the base attribute name should be the first underscore in the name.
string thisAttributeName = netAttribute.Name;
int nPos = thisAttributeName.IndexOf('_');
int nLastPos = thisAttributeName.Length - 1;
string baseNetAttributeName;
INetworkAttribute baseNetAttribute = null;
if (nPos > 0 && nPos < nLastPos)
{
baseNetAttributeName = thisAttributeName.Remove(0, nPos + 1);
try
{
baseNetAttribute = networkDataset.get_AttributeByName(baseNetAttributeName);
}
catch (COMException ex)
{
baseNetAttribute = null;
string msg = string.Format("Base Attribute ({0}) not found. {1}.", baseNetAttributeName, ex.Message);
System.Diagnostics.Trace.WriteLine(msg, "Scale Subset Network Evaluator");
}
if (baseNetAttribute != null)
{
if (baseNetAttribute.ID != m_thisNetworkAttributeID)
m_baseNetworkAttributeID = baseNetAttribute.ID;
}
}
Refresh();
}
public void Initialize(INetworkDataset networkDataset, IDENetworkDataset dataElement, INetworkSource source, IEvaluatedNetworkAttribute evaluatedNetworkAttribute)
{
// Cache the network dataset geodatabase path
m_workspace_path_name = ((IDataset)networkDataset).Workspace.PathName;
m_UseSpecificDates = false;
m_CacheOnEverySolve = false;
m_RidingABicycle = false;
m_UsingAWheelchair = false;
m_networkAttribute = evaluatedNetworkAttribute as INetworkAttribute2;
CheckForVerboseLogging();
if (m_VerboseLogging)
{
WriteToOutputFile(m_LogFile, "Initialize" + Environment.NewLine + "m_workspace_path_name: " + m_workspace_path_name + Environment.NewLine + " m_UseSpecificDates defaults to: " + m_UseSpecificDates);
}
}
/// <summary>Adds new Network Attribute Evaluators</summary>
private void AddEvaluators(NetworkAttributeInfo nai, IEvaluatedNetworkAttribute netAttr)
{
foreach (EvaluatorInfo eval in nai.Evaluators)
{
INetworkEvaluator evaluator = null;
if (eval.EvaluatorType == eEvaluatorType.Constant)
{
evaluator = new NetworkConstantEvaluatorClass();
if (netAttr.DataType == esriNetworkAttributeDataType.esriNADTBoolean)
((INetworkConstantEvaluator)evaluator).ConstantValue = eval.Expression.Equals(bool.TrueString, StringComparison.CurrentCultureIgnoreCase);
else if (netAttr.DataType == esriNetworkAttributeDataType.esriNADTDouble)
((INetworkConstantEvaluator)evaluator).ConstantValue = Convert.ToDouble(eval.Expression);
else if (netAttr.DataType == esriNetworkAttributeDataType.esriNADTFloat)
((INetworkConstantEvaluator)evaluator).ConstantValue = Convert.ToSingle(eval.Expression);
else if (netAttr.DataType == esriNetworkAttributeDataType.esriNADTInteger)
((INetworkConstantEvaluator)evaluator).ConstantValue = Convert.ToInt32(eval.Expression);
}
else if (eval.EvaluatorType == eEvaluatorType.Script)
{
evaluator = new NetworkScriptEvaluatorClass();
#if ARCGIS_10_0 // Handle Python script language added in ArcGIS 10.1
if (eval.ScriptLanguage != "VBScript")
throw new ApplicationException(RESMGR.GetString("GPTools_OSMGPCreateNetworkDataset_invalidScriptLanguage"));
INetworkScriptEvaluator scriptEvaluator = (INetworkScriptEvaluator)evaluator;
scriptEvaluator.SetExpression(eval.Expression, eval.Prelogic);
#else
INetworkScriptEvaluator2 scriptEvaluator = (INetworkScriptEvaluator2)evaluator;
scriptEvaluator.SetLanguage(eval.ScriptLanguage);
scriptEvaluator.SetExpression(eval.Expression, eval.Prelogic);
#endif
}
else if (eval.EvaluatorType == eEvaluatorType.Field)
{
evaluator = new NetworkFieldEvaluatorClass();
#if ARCGIS_10_0 // Handle Python script language added in ArcGIS 10.1
if (eval.ScriptLanguage != "VBScript")
throw new ApplicationException(RESMGR.GetString("GPTools_OSMGPCreateNetworkDataset_invalidScriptLanguage"));
INetworkFieldEvaluator fieldEvaluator = (INetworkFieldEvaluator)evaluator;
fieldEvaluator.SetExpression(eval.Expression, eval.Prelogic);
#else
INetworkFieldEvaluator2 fieldEvaluator = (INetworkFieldEvaluator2)evaluator;
fieldEvaluator.SetLanguage(eval.ScriptLanguage);
fieldEvaluator.SetExpression(eval.Expression, eval.Prelogic);
#endif
}
INetworkSource source = EnumerateNetworkSources()
.FirstOrDefault(ns => ns.Name.Equals(GetFullClassName(eval.Source), StringComparison.CurrentCultureIgnoreCase));
if (source != null)
{
esriNetworkEdgeDirection direction = eval.Direction;
if (!(source is IEdgeFeatureSource))
direction = esriNetworkEdgeDirection.esriNEDNone;
netAttr.set_Evaluator(source, direction, evaluator);
}
}
}
public bool SupportsDefault(esriNetworkElementType elementType, IEvaluatedNetworkAttribute attribute)
{
// This custom evaluator can not be used for assigning default attribute values
return(false);
}
public void Initialize(INetworkDataset networkDataset, IDENetworkDataset DataElement, INetworkSource netSource, IEvaluatedNetworkAttribute netAttribute)
{
// Initialize is called once per session (ArcMap session, ArcCatalog session, etc.) to initialize the evaluator for an associated network dataset
m_networkDataset = networkDataset;
m_networkSource = netSource;
m_networkAttribute = netAttribute;
m_thisNetworkAttributeID = netAttribute.ID;
m_baseNetworkAttributeID = -1;
//The attribute name must begin with one or more non underscore characters followed by
//an underscore character and then the name of the base cost attribute.
//The underscore prior to the base attribute name should be the first underscore in the name.
string thisAttributeName = netAttribute.Name;
int nPos = thisAttributeName.IndexOf('_');
int nLastPos = thisAttributeName.Length - 1;
string baseNetAttributeName;
INetworkAttribute baseNetAttribute = null;
if (nPos > 0 && nPos < nLastPos)
{
baseNetAttributeName = thisAttributeName.Remove(0, nPos + 1);
try
{
baseNetAttribute = networkDataset.get_AttributeByName(baseNetAttributeName);
}
catch (COMException ex)
{
baseNetAttribute = null;
string msg = string.Format("Base Attribute ({0}) not found. {1}.", baseNetAttributeName, ex.Message);
System.Diagnostics.Trace.WriteLine(msg, "Scale Subset Network Evaluator");
}
if (baseNetAttribute != null)
{
if (baseNetAttribute.ID != m_thisNetworkAttributeID)
{
m_baseNetworkAttributeID = baseNetAttribute.ID;
}
}
}
Refresh();
}
public bool SupportsDefault(esriNetworkElementType ElementType, IEvaluatedNetworkAttribute netAttribute)
{
return(false);
}
public void Initialize(INetworkDataset networkDataset, IDENetworkDataset dataElement, INetworkSource source, IEvaluatedNetworkAttribute attribute)
{
// Initialize is called once per session (ArcMap session, ArcCatalog session, etc.) to initialize the evaluator for an associated network dataset
Type t = Type.GetTypeFromProgID("esriFramework.AppRef");
try
{
// Activator.CreateInstance(t) is expected to error if the evaluator is created in an engine application
// which can�t get a reference to the AppRef singleton.
// This evaluator won�t work in Engine due to this design limitation. It is, however,
// fully functional in ArcMap.
System.Object obj = Activator.CreateInstance(t);
IApplication app = obj as IApplication;
if (app != null && app is IMxApplication)
{
m_mxDocument = app.Document as IMxDocument;
}
}
catch (Exception e)
{
m_mxDocument = null;
}
// Store reference to the network dataset and the network source
m_networkDataset = networkDataset;
m_networkSource = source;
// Create a new Dictionary hashtable for this network source
m_sourceHashTable = new Dictionary <int, int>();
}
public bool SupportsSource(INetworkSource source, IEvaluatedNetworkAttribute attribute)
{
// This custom evaluator supports restriction attributes for all sources
return(attribute.UsageType == esriNetworkAttributeUsageType.esriNAUTRestriction);
}
public bool SupportsDefault(esriNetworkElementType elementType, IEvaluatedNetworkAttribute attribute)
{
// This custom evaluator can not be used for assigning default attribute values.
return false;
}
public bool ValidateSource(IDatasetContainer2 datasetContainer, INetworkSource networkSource, IEvaluatedNetworkAttribute attribute, ref int errorCode, ref string errorDescription, ref string errorAppendInfo)
{
if (SupportsSource(networkSource, attribute))
{
errorCode = 0;
errorDescription = errorAppendInfo = string.Empty;
return(true);
}
else
{
errorCode = -1;
errorDescription = errorAppendInfo = string.Empty;
return(false);
}
}
public static void SetEvaluator(IEvaluatedNetworkAttribute netAttribute, INetworkSource netSource, Type t, esriNetworkEdgeDirection dirType)
{
object obj = Activator.CreateInstance(t);
INetworkEvaluator eval = obj as INetworkEvaluator;
netAttribute.set_Evaluator(netSource, dirType, eval);
}
public void Initialize(INetworkDataset networkDataset, IDENetworkDataset dataElement, INetworkSource source, IEvaluatedNetworkAttribute evaluatedNetworkAttribute)
{
// Cache the network dataset geodatabase path
m_workspace_path_name = ((IDataset)networkDataset).Workspace.PathName;
m_UseSpecificDates = false;
m_CacheOnEverySolve = false;
m_RidingABicycle = false;
m_UsingAWheelchair = false;
m_networkAttribute = evaluatedNetworkAttribute as INetworkAttribute2;
CheckForVerboseLogging();
if (m_VerboseLogging) WriteToOutputFile(m_LogFile, "Initialize" + Environment.NewLine + "m_workspace_path_name: " + m_workspace_path_name + Environment.NewLine + " m_UseSpecificDates defaults to: " + m_UseSpecificDates);
}
/// <summary>Adds new Network Attribute Evaluators</summary>
private void AddEvaluators(NetworkAttributeInfo nai, IEvaluatedNetworkAttribute netAttr)
{
foreach (EvaluatorInfo eval in nai.Evaluators)
{
INetworkEvaluator evaluator = null;
if (eval.EvaluatorType == eEvaluatorType.Constant)
{
evaluator = new NetworkConstantEvaluatorClass();
if (netAttr.DataType == esriNetworkAttributeDataType.esriNADTBoolean)
{
((INetworkConstantEvaluator)evaluator).ConstantValue = eval.Expression.Equals(bool.TrueString, StringComparison.CurrentCultureIgnoreCase);
}
else if (netAttr.DataType == esriNetworkAttributeDataType.esriNADTDouble)
{
((INetworkConstantEvaluator)evaluator).ConstantValue = Convert.ToDouble(eval.Expression);
}
else if (netAttr.DataType == esriNetworkAttributeDataType.esriNADTFloat)
{
((INetworkConstantEvaluator)evaluator).ConstantValue = Convert.ToSingle(eval.Expression);
}
else if (netAttr.DataType == esriNetworkAttributeDataType.esriNADTInteger)
{
((INetworkConstantEvaluator)evaluator).ConstantValue = Convert.ToInt32(eval.Expression);
}
}
else if (eval.EvaluatorType == eEvaluatorType.Script)
{
evaluator = new NetworkScriptEvaluatorClass();
#if ARCGIS_10_0 // Handle Python script language added in ArcGIS 10.1
if (eval.ScriptLanguage != "VBScript")
{
throw new ApplicationException(RESMGR.GetString("GPTools_OSMGPCreateNetworkDataset_invalidScriptLanguage"));
}
INetworkScriptEvaluator scriptEvaluator = (INetworkScriptEvaluator)evaluator;
scriptEvaluator.SetExpression(eval.Expression, eval.Prelogic);
#else
INetworkScriptEvaluator2 scriptEvaluator = (INetworkScriptEvaluator2)evaluator;
scriptEvaluator.SetLanguage(eval.ScriptLanguage);
scriptEvaluator.SetExpression(eval.Expression, eval.Prelogic);
#endif
}
else if (eval.EvaluatorType == eEvaluatorType.Field)
{
evaluator = new NetworkFieldEvaluatorClass();
#if ARCGIS_10_0 // Handle Python script language added in ArcGIS 10.1
if (eval.ScriptLanguage != "VBScript")
{
throw new ApplicationException(RESMGR.GetString("GPTools_OSMGPCreateNetworkDataset_invalidScriptLanguage"));
}
INetworkFieldEvaluator fieldEvaluator = (INetworkFieldEvaluator)evaluator;
fieldEvaluator.SetExpression(eval.Expression, eval.Prelogic);
#else
INetworkFieldEvaluator2 fieldEvaluator = (INetworkFieldEvaluator2)evaluator;
fieldEvaluator.SetLanguage(eval.ScriptLanguage);
fieldEvaluator.SetExpression(eval.Expression, eval.Prelogic);
#endif
}
INetworkSource source = EnumerateNetworkSources()
.FirstOrDefault(ns => ns.Name.Equals(GetFullClassName(eval.Source), StringComparison.CurrentCultureIgnoreCase));
if (source != null)
{
esriNetworkEdgeDirection direction = eval.Direction;
if (!(source is IEdgeFeatureSource))
{
direction = esriNetworkEdgeDirection.esriNEDNone;
}
netAttr.set_Evaluator(source, direction, evaluator);
}
}
}
public bool SupportsSource(INetworkSource source, IEvaluatedNetworkAttribute attribute)
{
// This custom evaluator supports added costs only for edges in attributes with units of Minutes
bool isEdgeSource = (source.ElementType == esriNetworkElementType.esriNETEdge);
bool isCostAttribute = (attribute.UsageType == esriNetworkAttributeUsageType.esriNAUTCost);
bool isMinutes = (attribute.Units == esriNetworkAttributeUnits.esriNAUMinutes);
return (isEdgeSource && isCostAttribute && isMinutes);
}
public bool SupportsSource(INetworkSource source, IEvaluatedNetworkAttribute attribute)
{
// This custom evaluator supports restriction attributes for all sources
return attribute.UsageType == esriNetworkAttributeUsageType.esriNAUTRestriction;
}
public bool ValidateSource(IDatasetContainer2 datasetContainer, INetworkSource networkSource, IEvaluatedNetworkAttribute attribute, ref int errorCode, ref string errorDescription, ref string errorAppendInfo)
{
if (SupportsSource(networkSource, attribute))
{
errorCode = 0;
errorDescription = errorAppendInfo = string.Empty;
return true;
}
else
{
errorCode = -1;
errorDescription = errorAppendInfo = string.Empty;
return false;
}
}
public static void SetDefaultEvaluator(IEvaluatedNetworkAttribute netAttribute, object defaultValue, esriNetworkElementType eType)
{
INetworkConstantEvaluator constEvaluator = new NetworkConstantEvaluatorClass();
constEvaluator.ConstantValue = defaultValue;
INetworkEvaluator eval = constEvaluator as INetworkEvaluator;
netAttribute.set_DefaultEvaluator(eType, eval);
}
