如何将Guid []转换为String？

Question

有点像String.Join(",", new string[] { "a", "b" });,但对于Guid[]

var guids = new Guid[] { Guid.Empty, Guid.Empty };

var str = /* Magic */

// str = 00000000-0000-0000-0000-000000000000,00000000-0000-0000-0000-000000000000

Answer 1

var str = guids.Select(g => g.ToString())
               .Aggregate((working, next) => working + "," + next);

一旦你的Guids列表开始增长,这种连接方法将导致性能问题.您可以修改它以使用StringBuilder:

var str = guids.Select(g => g.ToString())
               .Aggregate(new StringBuilder(),
                          (sb, str) => sb.Append("," + str),
                          sb => sb.ToString());

这两者都是复杂的LINQ Extension方法.你也可以简单地使用String.Join:

var str = String.Join(",", guids.Select(g => g.ToString()).ToArray());

Answer 2

String.Join(",", guids.Select(g => g.ToString()).ToArray());

Answer 3

.NET 4添加了一种String.Join<T>(string separator, IEnumerable<T> values方法.因此,在.NET 4中,这将起作用:

String.Join(",", guids);

Answer 4

我觉得这会有用吗？

StringBuilder stringBuilder = new StringBuilder();
int i = 0;
foreach (var guid in guids)
{
    stringBuilder.Append(guid.ToString());
    if (++i < guids.Length)
    { 
        stringBuilder.Append(","); 
    }
}

var str = stringBuilder.ToString();