AD網域認證發生錯誤：未知的錯誤 (0x80005000)

卡了我好久的 AD 網域讀取問題終於解決了，提供給有相同困擾的人。


AD讀取的程式碼(C#)

DirectoryEntry entry = new DirectoryEntry("LDAP://GOOGLE.COM.TW:389", "userName", "password");
entry.RefreshCache();

一直出現錯誤畫面：

解決的方法如下：

1. 在 Windows Server 2003 中，userName不需要加 domain。
2. ladp路徑要大寫  <=== 卡了我一個多禮拜的兇手。

如果你是這樣而排除錯誤的話，留個言讓我知道一下吧！

StringBuilder append null in Java and C# test

今天檢查了一下StringBuilder對於附加null的處理做了個小實驗。

Java:

import java.util.Calendar;

public class main {
 public static void main(String[] args) {
  testStringBuilder();
 }

 public static void testStringBuilder() {
  StringBuilder sBuilder = new StringBuilder();
  
  System.out.println("1. string of new StringBuilder()");
  if(sBuilder == null){
   System.out.println("string:[is null]");
  }else{
   System.out.println("result:string:[" + sBuilder + "],length:[" + sBuilder.length() + "]");
  }
  
  StringBuilder sBuilder2 = new StringBuilder("");
  
  System.out.println("2. string of new StringBuilder(\"\")");
  if(sBuilder2 == null){
   System.out.println("string:[is null]");
  }else{
   System.out.println("result:string:[" + sBuilder2 + "],length:[" + sBuilder2.length() + "]");
  }
  
  StringBuilder sBuilder3 = new StringBuilder();
  String nullString = null;
  sBuilder3.append(nullString);
  
  System.out.println("3. string of new StringBuilder() append null");
  if(sBuilder3 == null){
   System.out.println("string:[is null]");
  }else{
   System.out.println("result:string:[" + sBuilder3 + "],length:[" + sBuilder3.length() + "]");
  }
  
  StringBuilder sBuilder4 = new StringBuilder("");
  sBuilder4.append(nullString);
  
  System.out.println("4. string of new StringBuilder(\"\") append null");
  if(sBuilder4 == null){
   System.out.println("string:[is null]");
  }else{
   System.out.println("result:string:[" + sBuilder4 + "],length:[" + sBuilder4.length() + "]");
  }
 }