我正在尝试组合这样的功能列表。
我有这个:
Func<int, bool>[] criteria = new Func<int, bool>[3];
criteria[0] = i => i % 2 == 0;
criteria[1] = i => i % 3 == 0;
criteria[2] = i => i % 5 == 0;
我想要这个:
Func<int, bool>[] predicates = new Func<int, bool>[3];
predicates[0] = i => i % 2 == 0;
predicates[1] = i => i % 2 == 0 && i % 3 == 0;
predicates[2] = i => i % 2 == 0 && i % 3 == 0 && i % 5 == 0;
到目前为止,我有以下代码:
Expression<Func<int, bool>>[] results = new Expression<Func<int, bool>>[criteria.Length];
for (int i = 0; i < criteria.Length; i++)
{
results[i] = f => true;
for (int j = 0; j <= i; j++)
{
Expression<Func<int, bool>> expr = b => criteria[j](b);
var invokedExpr = Expression.Invoke(
expr,
results[i].Parameters.Cast<Expression>());
results[i] = Expression.Lambda<Func<int, bool>>(
Expression.And(results[i].Body, invokedExpr),
results[i].Parameters);
}
}
var predicates = results.Select(e => e.Compile()).ToArray();
Console.WriteLine(predicates[0](6)); // Returns true
Console.WriteLine(predicates[1](6)); // Returns false
Console.WriteLine(predicates[2](6)); // Throws an IndexOutOfRangeException
有谁知道我做错了什么?