在C#中将数组列表转换为逗号分隔的字符串 [英] Convert Array List to Comma Separated String in C#
问题描述
我正在使用 String.Join 尝试将数组列表转换为逗号分隔的字符串,例如
I'm using String.Join to attempt to turn an array list into a string that is comma separated, such as
xxx@xxx.com,yyy@xxx.com,zzz@xxx.com,www@xxx.com
我似乎无法使语法正常工作。
I can't seem to get the syntax working.
这就是我要尝试的:
for (i = 0; i < xxx; i++)
{
MailingList = arrayList[i].ToString();
MailingList = string.Join(", ", MailingList.ToString());
Response.Write(MailingList.ToString());
}
你能帮我吗?
预先感谢您-
推荐答案
从变量名猜测( arrayList
),您就可以在其中找到 List< string []>
或类似的类型。
Guessing from the name of your variable (arrayList
), you've got List<string[]>
or an equivalent type there.
这里的问题是您要在数组上调用 ToString()
。
尝试以下操作:
The issue here is that you're calling ToString()
on the array.
Try this instead:
for (i = 0; i < xxx; i++)
{
var array = arrayList[i];
MailingList = string.Join(", ", array);
Response.Write(MailingList);
}
编辑:如果 arrayList
只是一个包含字符串的 ArrayList
,您可以执行
If arrayList
is simply an ArrayList
containing strings, you can just do
Response.Write(string.Join(", ", arrayList.OfType<string>()));
个人而言,我会避免使用非通用集合(例如 ArrayList
),并使用 System.Collections.Generic
中的强类型集合,例如 List< string>
。例如,如果您有一段依赖的代码,其中 ArrayList
的所有内容都是字符串,那么如果您不小心添加了它,将会遭受灾难性的损失
Personally I would avoid using nongeneric collections (such as ArrayList
) if possible and use strongly-typed collections from System.Collections.Generic
such as List<string>
. For example, if you have a piece of code that depends on that all contents of the ArrayList
are strings, it will suffer catastrophically if you accidentally add an item that's not a string.
编辑2:如果您的 ArrayList
实际上包含 System .Web.UI.WebControls.ListItem
就像您在注释中提到的那样: arrayList.AddRange(ListBox.Items);
,那么您将需要改用以下代码:
EDIT 2: If your ArrayList
actually contains System.Web.UI.WebControls.ListItem
s like you mentioned in your comment: arrayList.AddRange(ListBox.Items);
, then you'll need to use this instead:
Response.Write(string.Join(", ", arrayList.OfType<ListItem>()));
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