//
// Summary:
// Visits the System.Linq.Expressions.ConstantExpression.
//
// Parameters:
// node:
// The expression to visit.
//
// Returns:
// The modified expression, if it or any subexpression was modified; otherwise,
// returns the original expression.
protected override Expression VisitConstant(ConstantExpression node)
{
Console.WriteLine("VisitConstant:");
Console.WriteLine('\t' + node.GetType().ToString());
Console.WriteLine('\t' + node.ToString());
return(base.VisitConstant(node));
}
private static int PrintConstant(ConstantExpression expression)
{
Write("ToString: " + expression);
Write("GetType: " + expression.GetType());
Write("NodeType: " + expression.NodeType);
Write("Type: " + expression.Type);
Write("Value: " + expression.Value);
return(0);
}
private static bool CompareConstant(ConstantExpression a, ConstantExpression b)
{
if (a.Value == b.Value)
{
return(true);
}
if (a.Value == null ||
b.Value == null)
{
return(false);
}
if (a.Value is EnumerableQuery &&
b.Value is EnumerableQuery)
{
return(false); // EnumerableQueries are opaque
}
/*
* if (a.IsEntityQueryable()
* && b.IsEntityQueryable()
* && a.Value.GetType() == b.Value.GetType())
* {
* return true;
* }
*/
if (typeof(ExpressionQuery <>).IsSameOrParentOf(a.GetType()) &&
typeof(ExpressionQuery <>).IsSameOrParentOf(b.GetType()) &&
a.Value.GetType() == b.Value.GetType())
{
return(true);
}
return(Equals(a.Value, b.Value));
}
