private bool RemoveClsExt(IClass classExtension)
{
ISchemaLock schemaLock = (ISchemaLock)classExtension;
bool result = false;
try
{
// Attempt to get an exclusive schema lock.
schemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);
// Cast the object class to the IClassSchemaEdit2 interface.
IClassSchemaEdit2 classSchemaEdit = (IClassSchemaEdit2)classExtension;
// Clear the class extension.
classSchemaEdit.AlterClassExtensionCLSID(null, null);
IObjectClassDescription featureClassDescription = new FeatureClassDescriptionClass();
classSchemaEdit.AlterInstanceCLSID(featureClassDescription.InstanceCLSID);
result = true;
}
catch
{
result = false;
}
finally
{
schemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
}
return(result);
}
private bool RemoveClsInstance(IClass classInstance, UID uid)
{
ISchemaLock schemaLock = (ISchemaLock)classInstance;
bool result = false;
try
{
// Attempt to get an exclusive schema lock.
schemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);
// Cast the object class to the IClassSchemaEdit2 interface.
IClassSchemaEdit2 classSchemaEdit = (IClassSchemaEdit2)classInstance;
classSchemaEdit.AlterInstanceCLSID(uid);
result = true;
}
catch
{
result = false;
}
finally
{
schemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
}
return(result);
}
/// <summary>
/// This method should be called the first time the extension is initialized, when the
/// extension properties are null. This will create a new set of properties with the default
/// field names.
/// </summary>
private void InitNewExtension()
{
// First time the extension has been run, initialize the extension properties.
extensionProperties = new PropertySetClass();
extensionProperties.SetProperty(Resources.CreatedFieldKey, createdFieldName);
extensionProperties.SetProperty(Resources.ModifiedFieldKey, modifiedFieldName);
extensionProperties.SetProperty(Resources.UserFieldKey, userFieldName);
// Store the properties.
IClass baseClass = classHelper.Class;
IClassSchemaEdit2 classSchemaEdit = (IClassSchemaEdit2)baseClass;
classSchemaEdit.AlterClassExtensionProperties(extensionProperties);
}
/// <summary>
/// Changes the member variables and extension properties to store the provided field names
/// as the created, modified and user fields (positions are also refreshed). Empty strings
/// indicate the values should not be saved in a field.
/// </summary>
/// <param name="createdField">The name of the "created" field.</param>
/// <param name="modifiedField">The name of the "modified" field.</param>
/// <param name="userField">The name of the "user" field.</param>
public void SetTimestampFields(String createdField, String modifiedField, String userField)
{
IClass baseClass = classHelper.Class;
ISchemaLock schemaLock = (ISchemaLock)baseClass;
try
{
// Get an exclusive lock. We want to do this prior to making any changes
// to ensure the member variables and extension properties remain synchronized.
schemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);
// Set the name member variables.
createdFieldName = createdField;
modifiedFieldName = modifiedField;
userFieldName = userField;
// Set the positions of the fields.
SetFieldIndexes();
// Modify the extension properties.
extensionProperties.SetProperty(Resources.CreatedFieldKey, createdFieldName);
extensionProperties.SetProperty(Resources.ModifiedFieldKey, modifiedFieldName);
extensionProperties.SetProperty(Resources.UserFieldKey, userFieldName);
// Change the properties.
IClassSchemaEdit2 classSchemaEdit = (IClassSchemaEdit2)baseClass;
classSchemaEdit.AlterClassExtensionProperties(extensionProperties);
}
catch (COMException comExc)
{
throw new Exception(Resources.FailedToSavePropertiesMsg, comExc);
}
finally
{
schemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
}
}
