protected virtual void OnSelecting(CrmMetadataDataSourceSelectingEventArgs args)
{
EventHandler <CrmMetadataDataSourceSelectingEventArgs> handler = base.Events[EventSelecting] as EventHandler <CrmMetadataDataSourceSelectingEventArgs>;
if (handler != null)
{
handler(this, args);
}
}
protected override IEnumerable ExecuteSelect(DataSourceSelectArguments arguments)
{
Tracing.FrameworkInformation("CrmMetadataDataSourceView", "ExecuteSelect", "Begin");
if (CanSort)
{
arguments.AddSupportedCapabilities(DataSourceCapabilities.Sort);
}
if (CanPage)
{
arguments.AddSupportedCapabilities(DataSourceCapabilities.Page);
}
if (CanRetrieveTotalRowCount)
{
arguments.AddSupportedCapabilities(DataSourceCapabilities.RetrieveTotalRowCount);
}
// merge SelectParameters
IOrderedDictionary parameters = SelectParameters.GetValues(Context, Owner);
string sortExpression = GetNonNullOrEmpty(
arguments.SortExpression,
parameters[_sortExpressionParameterName] as string,
SortExpression);
string entityName = GetNonNullOrEmpty(
parameters[_entityNameParameterName] as string,
EntityName);
string attributeName = GetNonNullOrEmpty(
parameters[_attributeNameParameterName] as string,
AttributeName);
var metadataFlags = MetadataFlags;
if (parameters.Contains(_metadataFlagsParameterName))
{
metadataFlags = (parameters[_metadataFlagsParameterName] as string).ToEnum <EntityFilters>();
}
var entityFlags = EntityFlags;
if (parameters.Contains(_entityFlagsParameterName))
{
entityFlags = (parameters[_entityFlagsParameterName] as string).ToEnum <EntityFilters>();
}
// raise pre-event
CrmMetadataDataSourceSelectingEventArgs selectingArgs = new CrmMetadataDataSourceSelectingEventArgs(
Owner,
arguments,
entityName,
attributeName,
metadataFlags,
entityFlags,
sortExpression);
OnSelecting(selectingArgs);
if (selectingArgs.Cancel)
{
Tracing.FrameworkInformation("CrmMetadataDataSourceView", "ExecuteSelect", "Cancel");
return(null);
}
// merge event results
arguments.RaiseUnsupportedCapabilitiesError(this);
sortExpression = selectingArgs.SortExpression;
entityName = selectingArgs.EntityName;
attributeName = selectingArgs.AttributeName;
metadataFlags = selectingArgs.MetadataFlags;
entityFlags = selectingArgs.EntityFlags;
if (CancelSelectOnNullParameter && string.IsNullOrEmpty(entityName) && string.IsNullOrEmpty(attributeName))
{
Tracing.FrameworkInformation("CrmMetadataDataSourceView", "ExecuteSelect", "CancelSelectOnNullParameter");
return(null);
}
IEnumerable result = null;
int rowsAffected = 0;
try
{
if (Owner.CacheParameters.Enabled)
{
var cacheKey = GetCacheKey(metadataFlags, entityFlags, entityName, attributeName, sortExpression);
result = ObjectCacheManager.Get(cacheKey,
cache =>
{
var metadata = ExecuteSelect(entityName, attributeName, sortExpression, entityFlags, metadataFlags, out rowsAffected);
return(metadata);
},
(cache, metadata) =>
{
if (metadata != null)
{
var dependencies = GetCacheDependencies(metadata);
cache.Insert(cacheKey, metadata, dependencies);
}
});
}
else
{
result = ExecuteSelect(entityName, attributeName, sortExpression, entityFlags, metadataFlags, out rowsAffected);
}
}
catch (System.Web.Services.Protocols.SoapException ex)
{
Tracing.FrameworkError("CrmMetadataDataSourceView", "ExecuteSelect", "{0}\n\n{1}", ex.Detail.InnerXml, ex);
}
catch (Exception e)
{
Tracing.FrameworkError("CrmMetadataDataSourceView", "ExecuteSelect", "Exception: {0}", e);
// raise post-event with exception
CrmMetadataDataSourceStatusEventArgs selectedExceptionArgs = new CrmMetadataDataSourceStatusEventArgs(0, e);
OnSelected(selectedExceptionArgs);
if (!selectedExceptionArgs.ExceptionHandled)
{
throw;
}
return(result);
}
// raise post-event
CrmMetadataDataSourceStatusEventArgs selectedArgs = new CrmMetadataDataSourceStatusEventArgs(rowsAffected, null);
OnSelected(selectedArgs);
Tracing.FrameworkInformation("CrmMetadataDataSourceView", "ExecuteSelect", "End");
return(result);
}
