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爲什麼VisitParameter打印每個參數2次?ExpressionVisitor.VisitParameter,它爲什麼每次打印2次參數?
class MyExpressionVisitor : ExpressionVisitor
{
protected override Expression VisitParameter(ParameterExpression node)
{
Console.WriteLine(node.Name);
Console.WriteLine("*************************");
return base.VisitParameter(node);
}
}
class Program
{
public static void Main(string[] args)
{
Expression<Func<int,int int>> someExpr = (x,y) => x + y + 1;
var myVisitor = new MyExpressionVisitor();
myVisitor.Visit(someExpr);
Console.ReadKey();
}
}
其結果是:
X
ý
X
ÿ