示例1：
string[] array = { "A", "B", "C", "D" }; string str = string.Join(",", array);
示例2：
var insuredLogs = Model.Select(i => i.InsuredLogId).ToArray(); <input type="text" id="InsuredLogs" name="InsuredLogs" value="@string.Join(",",insuredLogs)"/>
原文：https://www.cnblogs.com/firstcsharp/p/13962229.html