C# PrincipalContext:异常详细信息：System.DirectoryServices.DirectoryServicesCOMException:发生操作错误

我试图搜索一个用户的广告，但它总是抛出一个异常。应用程序已设置为使用AppPool。我确信登录用户可以访问搜索广告

代码：

源错误：

Line 45:             PrincipalContext DC = new PrincipalContext(ContextType.Domain, "lm.lmig.com", "DC=lm,DC=lmig,DC=com,OU=LM Users");
Line 46:             UserPrincipal userSearch = new UserPrincipal(DC);
Line 47:             userSearch.SamAccountName = "(&(objectClass=user)(sam)";
Line 48:             PrincipalSearcher search = new PrincipalSearcher();
Line 49:             search.QueryFilter = userSearch;

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在我看来，在

PrincipalContext

构造函数中分配错误的值和分配给

SamAccountName

的值看起来可疑，似乎是异常的可能原因

DN应按相反顺序包含路径，即当OU和DC组件都存在时，应以OU或CN开始。此外，SamAccountName值必须是有效的字符串值

请尝试以下方法：

 PrincipalContext DC = new PrincipalContext(ContextType.Domain, 
        "lm.lmig.com", "OU=LM Users,DC=lm,DC=lmig,DC=com");
 userSearch.SamAccountName = sam; // assuming sam is an actual possible string value.
 // sAMAccountName must be a string value as shown above, and not a filter type.
 PrincipalSearcher search = new PrincipalSearcher();
 search.QueryFilter = userSearch;
 PrincipalSearchResult<Principal> res = search.FindAll();

PrincipalContext DC=新PrincipalContext（ContextType.Domain，
“lm.lmig.com”，“OU=lm用户，DC=lm，DC=lmig，DC=com”）；
userSearch.SamAccountName=sam；//假设sam是实际可能的字符串值。
//sAMAccountName必须是如上所示的字符串值，而不是筛选器类型。
PrincipalSearcher=新PrincipalSearcher（）；
search.QueryFilter=userSearch；
PrincipalSearchResult res=search.FindAll（）；

谢谢！我很确定这是有效的。我再也不会犯那种错误了。

Line 45:             PrincipalContext DC = new PrincipalContext(ContextType.Domain, "lm.lmig.com", "DC=lm,DC=lmig,DC=com,OU=LM Users");
Line 46:             UserPrincipal userSearch = new UserPrincipal(DC);
Line 47:             userSearch.SamAccountName = "(&(objectClass=user)(sam)";
Line 48:             PrincipalSearcher search = new PrincipalSearcher();
Line 49:             search.QueryFilter = userSearch;

 PrincipalContext DC = new PrincipalContext(ContextType.Domain, 
        "lm.lmig.com", "OU=LM Users,DC=lm,DC=lmig,DC=com");
 userSearch.SamAccountName = sam; // assuming sam is an actual possible string value.
 // sAMAccountName must be a string value as shown above, and not a filter type.
 PrincipalSearcher search = new PrincipalSearcher();
 search.QueryFilter = userSearch;
 PrincipalSearchResult<Principal> res = search.FindAll();