public override int AddToProjection(IProperty property, IQuerySource querySource)
{
if (TypeValidator.IsValidat(property.Name) == false)
{
return(-999);
}
return(base.AddToProjection(property, querySource));
}
public override Expression Visit(Expression node)
{
if (node == null)
{
return(node);
}
var targetExpression
= QueryModelVisitor.QueryCompilationContext.QuerySourceMapping
.GetExpression(_querySource);
if (targetExpression.Type == typeof(ValueBuffer) &&
!CheckedMember(node as MemberExpression))
{
return(node);
}
var result = base.Visit(node);
if (result.NodeType == ExpressionType.Convert)
{
var convert = result as UnaryExpression;
var pas = convert.Operand as MethodCallExpression;
var parmeter = pas.Arguments.ToArray()[0] as ConstantExpression;
if (parmeter.Type == typeof(int) && object.Equals(parmeter.Value, -999))
{
parmeter = Expression.Constant(0);
var gentMethod = convertMethod.MakeGenericMethod(convert.Type, parmeter.Type);
pas = Expression.Call(gentMethod, parmeter);
result = Expression.Convert(pas, convert.Type);
}
return(result);
}
switch (node)
{
case MemberExpression column:
if (TypeValidator.IsValidat(column.Member.Name) == false)
{
var select = column.Expression as QuerySourceReferenceExpression;
var type = select.ReferencedQuerySource.ItemType;
for (int i = 0; i < Projection.Count; i++)
{
var col = Projection[i] as ColumnExpression;
if (col.Name == column.Member.Name)
{
Projection.RemoveAt(i);
}
}
}
break;
default:
break;
}
//var column = node as MemberExpression;
//if (column != null && TypeValidator.IsValidat(column.Member.Name) == false)
//{
// var select = column.Expression as QuerySourceReferenceExpression;
// var type = select.ReferencedQuerySource.ItemType;
// for (int i = 0; i < Projection.Count; i++)
// {
// var col = Projection[i] as ColumnExpression;
// if (col.Name == column.Member.Name)
// {
// Projection.RemoveAt(i);
// }
// }
//}
return(result);
}
private bool CheckedMember(MemberExpression column)
{
var result = column != null && TypeValidator.IsValidat(column.Member.Name) == false;
return(result);
}