设置列表= 列表<字符串>; - 有一个脑死亡的时刻

发布于 2024-10-09 12:34:25 字数 465 浏览 4 评论 0原文

我确信这很容易。事实上,我确信我之前已经这样做过......

我有一个 MyClass 类,它有 2 个参数 TheString 和 SomeInt

某处,在另一个类中我声明了一个 List; MyClassList 和一个 ListStringList

两者具有相同数量的项目。我希望将 MyClassList 中每个 MyClass 中的所有“TheStrings”设置为等于 StringList 中相应的字符串

我设置了 MyClassList = StringList

现在我知道这不起作用,因为它们是不同的类型。我想我必须重载赋值(=)运算符,但我不知道这是如何完成的。我想我总是可以提供一个从 MyClass 调用的方法,但这并不是那么优雅。最优雅的解决方案是什么?

谢谢 托马斯

I'm sure this is easy. Infact I'm sure I've done this before...

I have a class of MyClass which has 2 parameters TheString and SomeInt

Somewhere, in another class I declare an List<MyClass> MyClassList and a List<String> StringList

Both have the same number of items. I want this to set all "TheStrings" in each MyClass from MyClassList equal to the corresponding String from StringList

I set MyClassList = StringList

Now I know this wont work because they're different types. I think I've got to overload the assignment (=) operator but I can't see how this is done. I suppose I could always provide a method to call from MyClass, but that isn't quite so elegant. What would be the most elegant solution?

Thanks
Thomas

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评论(3

醉生梦死 2024-10-16 12:34:25

您不能重载 = 运算符。您可以进行隐式转换,例如来自 MSDN 的示例:

public static implicit operator double(Digit d)
{
   return d.val;
}

但是对于列表,我认为最好的解决方案是使用 LINQ:

List<MyClass> list = (from value in StringList
                     select new MyClass { TheString = value }).ToList();

You can't overload the = operator. You could do an implicit conversion, example from MSDN:

public static implicit operator double(Digit d)
{
   return d.val;
}

However in case of lists I think the best solution is to use LINQ:

List<MyClass> list = (from value in StringList
                     select new MyClass { TheString = value }).ToList();
情话难免假 2024-10-16 12:34:25

信息还远远不够,但是:

var customObjects = new List<CustomObject>(TheStringList.Select(s => new CustomObject { TheString = s }));

我没有对此进行测试,但我想展示我想到的想法。

Nowhere near enough information, but:

var customObjects = new List<CustomObject>(TheStringList.Select(s => new CustomObject { TheString = s }));

I didn't test this, but I wanted to show the idea that came to mind.

我不会写诗 2024-10-16 12:34:25

当听起来简单的 for 循环就足够了时,您似乎正在寻找优雅,并且很可能是神奇的。您已将问题描述为有两个大小相等的列表,一个是特定类,另一个是字符串。您希望将每个类上的字符串属性设置为相反列表中的相应字符串(因此大概这些已排序并且位于匹配的索引处)。您所需要的只是一个循环。

for (int index = 0; index = MyClassList.Count; index++)
{
     MyClassList[index].TheString = StringList[index];
}

It seems you're looking for elegance and quite possibly magic when it sounds like a simple for loop should suffice. You've described the problem as having two equally sized lists, one of a particular class, another of strings. You want to set a string property on each class to the corresponding string in the opposite list (so presumably these are sorted and at matching indexes). All you need is a loop.

for (int index = 0; index = MyClassList.Count; index++)
{
     MyClassList[index].TheString = StringList[index];
}
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