作业帮Dictionary Dictionary _dic = new Dictionary();Hashtable _ht = new Hashtable();while (_dr.Read()){_ht.Clear();for (int i = 0; i < _dr.FieldCount; i++){_ht.Add(_dr.GetName(i),_dr[i]);}_dic.Add(_i,_ht);_i++;}我原本是想循环记录集并将其添加
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/31 21:55:26
![Dictionary Dictionary _dic = new Dictionary();Hashtable _ht = new Hashtable();while (_dr.Read()){_ht.Clear();for (int i = 0; i < _dr.FieldCount; i++){_ht.Add(_dr.GetName(i),_dr[i]);}_dic.Add(_i,_ht);_i++;}我原本是想循环记录集并将其添加](/uploads/image/z/12940310-38-0.jpg?t=Dictionary+Dictionary+_dic+%3D+new+Dictionary%28%29%3BHashtable+_ht+%3D+new+Hashtable%28%29%3Bwhile+%28_dr.Read%28%29%29%7B_ht.Clear%28%29%3Bfor+%28int+i+%3D+0%3B+i+%3C+_dr.FieldCount%3B+i%2B%2B%29%7B_ht.Add%28_dr.GetName%28i%29%2C_dr%5Bi%5D%29%3B%7D_dic.Add%28_i%2C_ht%29%3B_i%2B%2B%3B%7D%E6%88%91%E5%8E%9F%E6%9C%AC%E6%98%AF%E6%83%B3%E5%BE%AA%E7%8E%AF%E8%AE%B0%E5%BD%95%E9%9B%86%E5%B9%B6%E5%B0%86%E5%85%B6%E6%B7%BB%E5%8A%A0)
Dictionary Dictionary _dic = new Dictionary();Hashtable _ht = new Hashtable();while (_dr.Read()){_ht.Clear();for (int i = 0; i < _dr.FieldCount; i++){_ht.Add(_dr.GetName(i),_dr[i]);}_dic.Add(_i,_ht);_i++;}我原本是想循环记录集并将其添加
Dictionary
Dictionary _dic = new Dictionary();
Hashtable _ht = new Hashtable();
while (_dr.Read())
{
_ht.Clear();
for (int i = 0; i < _dr.FieldCount; i++)
{
_ht.Add(_dr.GetName(i),_dr[i]);
}
_dic.Add(_i,_ht);
_i++;
}
我原本是想循环记录集并将其添加到hashtable中,再将记录依次添加到dictionary里.但是每次循环后,dictionary里hashtable的值都变掉了（就是dictionary 和 dictionary里的所有hashtable都同步更新,都是一个值.）,该怎么改才能实现我要的结果呢?
Dictionary Dictionary _dic = new Dictionary();Hashtable _ht = new Hashtable();while (_dr.Read()){_ht.Clear();for (int i = 0; i < _dr.FieldCount; i++){_ht.Add(_dr.GetName(i),_dr[i]);}_dic.Add(_i,_ht);_i++;}我原本是想循环记录集并将其添加
Dictionary _dic = new Dictionary();
Hashtable _ht;
while (_dr.Read())
{
_ht=new Hashtable(); // 每个循环都创建一个新的对象
for (int i = 0; i < _dr.FieldCount; i++)
{
_ht.Add(_dr.GetName(i), _dr[i]);
}
_dic.Add(_i, _ht);
_i++;
}
dictionary放的是hashtable对象的引用.因为你只new 了一个hashtable对象,当然会出现同步更新的现象了.解决办法是每个循环都new一个hashtable对象.