目前，我有如下，从LDAP拉。

Currently, I have the below, pulling from LDAP.

// Get context, based on currently logged on user
PrincipalContext domainContext = new PrincipalContext(ContextType.Domain, Environment.UserDomainName);
// Search for the "Domain Users" group, with domain context
GroupPrincipal group = GroupPrincipal.FindByIdentity(domainContext, IdentityType.SamAccountName, "Domain Users");
if(group != null) {
    List<Principal> members = null;
    members = group.GetMembers(false)
        .OrderBy(principal => principal.Name).ToList();
        List<Principal> Principals = members
        .OrderBy(a => a.Name.Split(',')[0])
        .ThenBy(a => a.Name.Split(',')[1])
        .ThenBy(a => a.SamAccountName).ToList();
}

我遇到的问题是，如果我有李四，约翰它工作正常，但如果我有Admin01，它崩溃，因为它无法找到的第二部分。我如何改变它，如果它只有一个字，将工作呢？

The problem I run into is that if I have Doe,John it works fine, but if I have Admin01, it crashes because it can't find the second part. How do I change it so that if it is only one word it will work as well?

推荐答案

首先，我会把它投射到一个复合型，这样你就不会拆了个遍。 然后，我会用？ ：运营商。然后投影回得到原始类型。

First, I would project it to a compound type so that you don't split over and over. Then I would use a ? : operator. Then project back to get the original type.

members
  .Select( m => new { member = m, split = m.Name.Split(',') } )
  .OrderBy( a => a.split[0] )
  .ThenBy( a => a.split.Count() > 1 ? a.split[1] : string.Empty )
  .ThenBy( a => a.member.SamAccountNamr )
  .Select( a => a.member );