Array转String

public void ArrayToString()
{
ArrayList pointset = new ArrayList();//定义数值，类型自行确定，假定时double
double[] arr = (double[])(pointset.ToArray(typeof(double))); //数据类型关联数值转数值，字符转字符否则会报错
string[] objs = Array.ConvertAll(arr, new Converter<double, string>(doubleToString));//将数组转换为字符数值
object[] obj = new object[] { string.Join(",", objs) };//将数组转换为字符串，可以自定义分割符
}
//数组转换函数
private string doubleToString(double value)
{
return value.ToString();
}