当被检索对象数据量较大时,我们希望输入某条记录的拼音首字母,就可以显示一个下拉单,显示出符合条件的记录。
实现:
语言: C#;
输入框:txtSearch;
下拉框:ListBox(这个地方也没想到更好的办法,如果有更好的办法,欢迎分享)
首先,把汉字字符串转为拼音首字母:
///
/// 把汉字字符串转为拼音首字母
///
/// 待转中文字符串
///
public static string ChineseCap(string ChineseStr)
{
string Capstr = string.Empty;
//每个汉字存储需要两个字节
byte[] ZW = new byte[2];
// 汉字的整数表示形式
long ChineseStr_int = 0;
// 取出一个汉字
string CharStr = string.Empty;
// 汉字首字母
string ChinaStr = string.Empty;
for (int i = 0; i <= ChineseStr.Length - 1; i++)
{
//取出一个汉字
CharStr = ChineseStr.Substring(i, 1).ToString();
//得到汉字的字节表示
ZW = System.Text.Encoding.Default.GetBytes(CharStr);
// 得到汉字符的字节数组
if (ZW.Length == 2)
{
int i1 = (short)(ZW[0]);
int i2 = (short)(ZW[1]);
ChineseStr_int = i1 * 256 + i2;
#region 参数
//table of the constant list
// 'A'; //45217..45252
// 'B'; //45253..45760
// 'C'; //45761..46317
// 'D'; //46318..46825
// 'E'; //46826..47009
// 'F'; //47010..47296
// 'G'; //47297..47613
// 'H'; //47614..48118
// 'J'; //48119..49061
// 'K'; //49062..49323
// 'L'; //49324..49895
// 'M'; //49896..50370
// 'N'; //50371..50613
// 'O'; //50614..50621
// 'P'; //50622..50905
// 'Q'; //50906..51386
// 'R'; //51387..51445
// 'S'; //51446..52217
// 'T'; //52218..52697
//没有U,V
// 'W'; //52698..52979
// 'X'; //52980..53640
// 'Y'; //53689..54480
// 'Z'; //54481..55289
#endregion
#region 判断
if ((ChineseStr_int >= 45217) && (ChineseStr_int <= 45252))
{
ChinaStr = "A";
}
else if ((ChineseStr_int >= 45253) && (ChineseStr_int <= 45760))
{
ChinaStr = "B";
}
else if ((ChineseStr_int >= 45761) && (ChineseStr_int <= 46317))
{
ChinaStr = "C";
}
else if ((ChineseStr_int >= 46318) && (ChineseStr_int <= 46825))
{
ChinaStr = "D";
}
else if ((ChineseStr_int >= 46826) && (ChineseStr_int <= 47009))
{
ChinaStr = "E";
}
else if ((ChineseStr_int >= 47010) && (ChineseStr_int <= 47296))
{
ChinaStr = "F";
}
else if ((ChineseStr_int >= 47297) && (ChineseStr_int <= 47613))
{
ChinaStr = "G";
}
else if ((ChineseStr_int >= 47614) && (ChineseStr_int <= 48118))
{
ChinaStr = "H";
}
else if ((ChineseStr_int >= 48119) && (ChineseStr_int <= 49061))
{
ChinaStr = "J";
}
else if ((ChineseStr_int >= 49062) && (ChineseStr_int <= 49323))
{
ChinaStr = "K";
}
else if ((ChineseStr_int >= 49324) && (ChineseStr_int <= 49895))
{
ChinaStr = "L";
}
else if ((ChineseStr_int >= 49896) && (ChineseStr_int <= 50370))
{
ChinaStr = "M";
}
else if ((ChineseStr_int >= 50371) && (ChineseStr_int <= 50613))
{
ChinaStr = "N";
}
else if ((ChineseStr_int >= 50614) && (ChineseStr_int <= 50621))
{
ChinaStr = "O";
}
else if ((ChineseStr_int >= 50622) && (ChineseStr_int <= 50905))
{
ChinaStr = "P";
}
else if ((ChineseStr_int >= 50906) && (ChineseStr_int <= 51386))
{
ChinaStr = "Q";
}
else if ((ChineseStr_int >= 51387) && (ChineseStr_int <= 51445))
{
ChinaStr = "R";
}
else if ((ChineseStr_int >= 51446) && (ChineseStr_int <= 52217))
{
ChinaStr = "S";
}
else if ((ChineseStr_int >= 52218) && (ChineseStr_int <= 52697))
{
ChinaStr = "T";
}
else if ((ChineseStr_int >= 52698) && (ChineseStr_int <= 52979))
{
ChinaStr = "W";
}
else if ((ChineseStr_int >= 52980) && (ChineseStr_int <= 53640))
{
ChinaStr = "X";
}
else if ((ChineseStr_int >= 53689) && (ChineseStr_int <= 54480))
{
ChinaStr = "Y";
}
else if ((ChineseStr_int >= 54481) && (ChineseStr_int <= 55289))
{
ChinaStr = "Z";
}
#endregion
}
else
{
// 非汉字时退出
//Capstr = ChineseStr;
break;
}
Capstr = Capstr + ChinaStr;
}
return Capstr;
}
txtSearch输入拼音首字母,显示下拉单:
///
/// 接收输入字符
///
///
///
private void txtSearch_KeyUp(object sender, KeyEventArgs e)
{
char tmp = (char)e.KeyValue;
try
{
// 临时存储
Dictionary tmpDic = new Dictionary();
if (null == tmpFutureType)
{ tmpFutureType = new Dictionary(); }
int id = txtSearch.Text.Trim().Length;
if (id < 1)
{ tmpFutureType.Clear(); return; }
if (tmpFutureType.Count > 0)
{
foreach (string key in tmpFutureType.Keys)
{
if (key.Length >= id)
{
if (tmp.ToString().Equals(key.Substring(id - 1, 1)))
{
// 加入临时队列
tmpDic.Add(key, tmpFutureType[key]);
}
}
}
tmpFutureType.Clear();
// 从临时队列中复制到tmpFutureType
tmpFutureType = tmpDic;
}
else
{
foreach (string key in CGlobal.DicFutureTypePinYin.Keys)
{
if (key.Length >= id)
{
if (tmp.ToString().Equals(key.Substring(id - 1, 1)))
{
// 加入tmpFutureType
tmpFutureType.Add(key, CGlobal.DicFutureTypePinYin[key]);
}
}
}
}
// 加入下拉列表
lboxTmp.Items.Clear();
foreach (string key in tmpFutureType.Keys)
{
lboxTmp.Items.Add(tmpFutureType[key]);
}
if (lboxTmp.Items.Count > 0)
{
lboxTmp.Visible = true;
}
}
catch (Exception ex)
{
CGlobal._logHelper.WriteLog(LogStyle.eError, ex.Message);
}
}