c# - 在 C# 中用 List<> 替换 ArrayList

Question

我广泛使用 ArrayList 并且很难使用这个 List<>。我正在使用 EntitySpace ORM 来做 DAL 的事情。这东西工作得很好，但问题是我必须定义 List<> 对象类型，它提示它无法转换它。

感谢您的帮助。

原始使用 ArrayList:

public ArrayList Get()
    {
        TndCustomerTendersCollection collection = new TndCustomerTendersCollection();
        collection.Query
        .Select
        (
            collection.Query.CustomerTenderID,
            collection.Query.CustomerTenderID,
            collection.Query.CustomerTenderCode,
            collection.Query.CustomerTenderName,
            collection.Query.StartDate,
            collection.Query.DueDate,
            collection.Query.CompleteDate,
            collection.Query.DateCreated,
            collection.Query.LastDateModified
        )
        .Where
        (
            collection.Query.IsActive.Equal(true)
        );

    ArrayList list = new ArrayList ();
        foreach (TndCustomerTenders item in collection)
        {
            list.Add(item);
        }
        return list;
    }

替换为List后

public List<Tender> Get()
    {
        TndCustomerTendersCollection collection = new TndCustomerTendersCollection();
        collection.Query
        .Select
        (
            collection.Query.CustomerTenderID,
            collection.Query.CustomerTenderID,
            collection.Query.CustomerTenderCode,
            collection.Query.CustomerTenderName,
            collection.Query.StartDate,
            collection.Query.DueDate,
            collection.Query.CompleteDate,
            collection.Query.DateCreated,
            collection.Query.LastDateModified
        )
        .Where
        (
            collection.Query.IsActive.Equal(true)
        );

        // HOW DO CONVERT THAT TO THAT LIST

        List<Tender> list = new List<Tender>();
        foreach (TndCustomerTenders item in collection)
        {
            list.Add(item);
        }
        return list;
    }

Answer 1

TndCustomerTenders 和 Tender 是两种不同的类型。

您需要将 TndCustomerTenders 显式转换为 Tender，或者您需要定义隐式转换。

List<Tender> list = new List<Tender>();
        foreach (TndCustomerTenders item in collection)
        {
            //assumes conversion via constructor
            list.Add(new Tender(item));
        }

或

List<Tender> list = new List<Tender>();
        foreach (TndCustomerTenders item in collection)
        {
            Tender t = new Tender() { foo = item.foo, bar = item.bar };
            list.Add(t);
        }