无法将 ListBox.ObjectCollection 转换为(类型化)数组 [英] Can't convert ListBox.ObjectCollection to a (typed) array

问题描述

我想将项目转换为字符串数组或用于填充 ListBox.DataSource 的类型.该类型已覆盖 ToString()，但我似乎无法将其转换为 String[].

I want to convert the items to a String array or the type that I used to fill the ListBox.DataSource. The type has overridden ToString() but I can't seems to get it converted, not even to String[].

String[] a = (String[])ListBox1.Items;
Contacts[] b = (Contacts[])ListBox1.Items;

推荐答案

string[] a = ListBox1.Items.Cast<string>().ToArray();

当然，如果您打算对 a 做的只是对其进行迭代，则不必调用 ToArray().您可以直接使用 Cast 返回的 IEnumerable，例如:

Of course, if all you plan to do with a is iterate over it, you don't have to call ToArray(). You can directly use the IEnumerable<string> returned from Cast<string>(), e.g.:

foreach (var s in ListBox1.Items.Cast<string>()) {
    do_something_with(s);
}

或者，如果你有办法将字符串转换为联系人，你可以这样做:

Or, if you have some way to convert strings to Contacts, you can do something like this:

IEnumerable<Contacts> c = ListBox1.Items.Cast<string>().Select(s => StringToContact(s));

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