如何在 C# 中返回字符串列表
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How to return a list of strings in C#
提问by Cute
Can anybody tell me How to store and return List of Strings.
谁能告诉我如何存储和返回字符串列表。
I am asked this Because i have written a function which returns Collection of strings and I want to prepare a COM for that one and need to consume that COM(to get the returned list ) in VC++ where I can extend some functionality using that list of strings. I hope this would be clear.
我被问到这个因为我已经编写了一个返回字符串集合的函数，我想为那个函数准备一个 COM，并且需要在 VC++ 中使用该 COM（以获取返回的列表），我可以使用该列表扩展一些功能字符串。我希望这会很清楚。
采纳答案by Canavar
List<string>or string[] are the best options.
List<string>或 string[] 是最好的选择。
Here is a sample method that returns list of strings :
这是一个返回字符串列表的示例方法：
public static List<string> GetCities()
{
List<string> cities = new List<string>();
cities.Add("Istanbul");
cities.Add("Athens");
cities.Add("Sofia");
return cities;
}
回答by Blixt
You can store a fixed list of strings as an array:
您可以将固定的字符串列表存储为数组：
string[] myStrings = {"Hello", "World"};
Or a dynamic list as a List<string>:
或者动态列表作为List<string>：
List<string> myStrings = new List<string>();
myStrings.Add("Hello");
myStrings.Add("World");
回答by Brian Rasmussen
In C# you can simply return List<string>, but you may want to return IEnumerable<string>instead as it allows for lazy evaluation.
在 C# 中，您可以简单地 return List<string>，但您可能想要 return ，IEnumerable<string>因为它允许延迟计算。
回答by Daniel Earwicker
Yesterday you asked how to do this via COM interop! Why the step backward?
昨天您询问如何通过 COM 互操作来执行此操作！为什么要退步？
How to return a collection of strings from C# to C++ via COM interop
回答by Rony
public static IList<string> GetStrings()
{
foreach( var item in GetStringItems())
yield return item;
}
回答by JBRWilkinson
There are many ways to represent a list of strings in .NET, List<string> being the slickest. However, you can't return this to COM because:
在 .NET 中有很多方法来表示字符串列表，List<string> 是最灵活的。但是，您不能将其返回给 COM，因为：
COM doesn't understand .NET Generics
FxCop will tell you that it's bad practice to return an internal implementation of something (List) rather than an abstract interface (IList / IEnumerable).
COM 不理解 .NET 泛型
FxCop 会告诉您，返回某些内容的内部实现（List）而不是抽象接口（IList / IEnumerable）是不好的做法。
Unless you want to get into really scary Variant SafeArray objects (not recommended), you need to create a 'collection' object so that your COM client can enumerate the strings.
除非您想进入非常可怕的 Variant SafeArray 对象（不推荐），否则您需要创建一个“集合”对象，以便您的 COM 客户端可以枚举字符串。
Something like this (not compiled - this is just an example to get you started):
像这样的东西（未编译 - 这只是让您入门的示例）：
[COMVisible(true)]
public class CollectionOfStrings
{
IEnumerator<string> m_enum;
int m_count;
public CollectionOfStrings(IEnumerable<string> list)
{
m_enum = list.GetEnumerator();
m_count = list.Count;
}
public int HowMany() { return m_count; }
public bool MoveNext() { return m_enum.MoveNext(); }
public string GetCurrent() { return m_enum.Current; }
}
(See http://msdn.microsoft.com/en-us/library/bb352856.aspx for more help)
（有关更多帮助，请参阅http://msdn.microsoft.com/en-us/library/bb352856.aspx）
