list属性字段直接转成字符串数组List<Car> cars = //whatever;
string concat = String.Join(",", cars.Select(c => c.Name).ToArray());
数组类型字符串转数组string concat = cars.Select(c => c.Name).Aggregate(new StringBuilder(), (sb, current) =>
{
return sb.Length == 0 ? sb.Append(current) : sb.AppendFormat(",{0}", current);
}).ToString();

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