public override void VisitMainFromClause(MainFromClause fromClause, QueryModel queryModel)
{
bool processed = false;
expression = queryModel.MainFromClause.FromExpression;
if (expression is SubQueryExpression)
{
QueryModel subQueryModel = ((SubQueryExpression)expression).QueryModel;
VisitQueryModel(subQueryModel);
processed = true;
}
if (expression is ConstantExpression)
{
expression = Utility.DbContextHelper.GetDbSet(dbContext, (ConstantExpression)expression);
if (BaseSourceExpressionCreated != null)
{
BaseSourceExpressionCreatedEventArgs eventArgs = new BaseSourceExpressionCreatedEventArgs(expression, queryModel.MainFromClause.ItemType);
BaseSourceExpressionCreated(this, eventArgs);
expression = eventArgs.Expression;
}
processed = true;
}
if (expression is MemberExpression)
{
QuerySourceReferenceExpression querySourceReferenceExpression = (expression as MemberExpression)?.Expression as QuerySourceReferenceExpression;
if (querySourceReferenceExpression != null)
{
Type paramType = querySourceReferenceExpression.ReferencedQuerySource.ItemType;
string paramName = querySourceReferenceExpression.ReferencedQuerySource.ItemName;
MainParamerExpression = Expression.Parameter(paramType, paramName);
expression = UpdateExpressionVisitor.Update(expression, new[] { MainParamerExpression }, dbContext, queryContext);
processed = true;
}
}
if (expression is ParameterExpression)
{
processed = true; //TODO?
}
if (!processed)
{
throw new NotImplementedException();
}
entityType = queryModel.MainFromClause.ItemType;
selectorType = queryModel.SelectClause.Selector.Type;
}
private void QueryModelVisitorBaseSourceExpressionCreated(object sender, BaseSourceExpressionCreatedEventArgs e)
{
e.Expression = dbContextSecurity.Security.SecurityExpressionBuilder.GetDatabaseReadExpressionFromSecurity(e.Expression, e.EntityType);
}