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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
namespace Signum.Engine.Linq
{
/// <summary>
/// returns the set of all aliases produced by a query source
/// </summary>
internal class AliasGatherer : DbExpressionVisitor
{
HashSet<string> aliases = new HashSet<string>();
private AliasGatherer() { }
public static HashSet<string> Gather(Expression source)
{
AliasGatherer ap = new AliasGatherer();
ap.Visit(source);
return ap.aliases;
}
protected override Expression VisitSelect(SelectExpression select)
{
this.aliases.Add(select.Alias);
return base.VisitSelect(select);
}
protected override Expression VisitTable(TableExpression table)
{
this.aliases.Add(table.Alias);
return base.VisitTable(table);
}
}
}
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I'm Computer Scientist, one of the founders of Signum Software, and the lead developer behind Signum Framework.
www.signumframework.com
I love programming in C#, Linq, Compilers, Algorithms, Functional Programming, Computer Graphics, Maths...