DataTable判断是否有重复数据

DataTable判断是否存在相同的值，存在的话直接抛异常：

DataTable dt = new DataTable();
var InputList = dt.AsEnumerable().Select(
     p => new
     {
         SourcePlatformCode = p["SourcePlatformCode"].ToString().Trim(),
         SourcePlatformName = p["SourcePlatformName"].ToString().Trim(),
     }).ToList();
var douList = InputList.GroupBy(p => new { p.SourcePlatformCode, p.SourcePlatformName }).Select(g => new { device = g.Key, cnt = g.Count() }).ToList();
if (douList.Find(p => p.cnt > 1) != null)
{
     throw new Exception("请检查是否有重复数据！");
}