XPath 쿼리로 날짜 범위 사이에 데이터를 가져 오는 방법

Question

<?xml version="1.0" encoding="utf-8" standalone="yes"?> 
<AppXmlLogWritter>  
    <LogData> 
    <LogID>5678201301211226306349434819061642515658</LogID> 
    <LogDateTime>**20130121**122630</LogDateTime> 
    <LogType>Warning</LogType> 
    <LogFlag>PMLogFlag</LogFlag> 
    <LogApplication>PMLogApplication</LogApplication> 
    <LogModule>PMLogModule</LogModule> 
    <LogLocation>PMLogLocation</LogLocation> 
    <LogText>PMLogText</LogText> 
    </LogData> 
    <LogData> 
    <LogID>5678201301211226306349434819063542617610</LogID> 
    <LogDateTime>**20130121**122630</LogDateTime> 
    <LogType>Warning</LogType> 
    <LogFlag>PMLogFlag</LogFlag> 
    <LogApplication>PMLogApplication</LogApplication> 
    <LogModule>PMLogModule</LogModule> 
    <LogLocation>PMLogLocation</LogLocation> 
    <LogText>PMLogText</LogText> 
    </LogData> 
    <LogData> 
    <LogID>5678201301211226306349434819065542731198</LogID> 
    <LogDateTime>**20130121**122630</LogDateTime> 
    <LogType>Warning</LogType> 
    <LogFlag>PMLogFlag</LogFlag> 
    <LogApplication>PMLogApplication</LogApplication> 
    <LogModule>PMLogModule</LogModule> 
    <LogLocation>PMLogLocation</LogLocation> 
    <LogText>PMLogText</LogText> 
    </LogData> 
    <LogData> 
    <LogID>5678201301211226306349434819067442849561</LogID> 
    <LogDateTime>**20130117**122630</LogDateTime> 
    <LogType>Warning</LogType> 
    <LogFlag>PMLogFlag</LogFlag> 
    <LogApplication>PMLogApplication</LogApplication> 
    <LogModule>PMLogModule</LogModule> 
    <LogLocation>PMLogLocation</LogLocation> 
    <LogText>PMLogText</LogText> 
    </LogData> 
</AppXmlLogWritter> 

위의 XmL 파일에서 XML 문서를 범위 사이에서 읽고 싶습니다. 그런 나는 날짜와 날짜 및 하나의 제출 단추에 datetimepicker 컨트롤을 사용하여 windows 폼을 구현합니다. 날짜를 FROM DATE에서 선택하고 TO DATE에서 TO DATE의 목록보기로 날짜를 표시합니다.

private void btnSubmit_Click(object sender, EventArgs e) 
     { 
XmlElement objXmlRoot = objXmldoc.DocumentElement; 
if (chkBoxFromDate.Checked && chkBoxToDate.Checked) 
      { 
       strXpathQuery = "/AppXmlLogWritter/LogData[LogDateTime >='" + dateTimePickerFromDate.Value.ToString("yyyyMMdd") + "' and LogDateTime <='" + dateTimePickerToDate.Value.ToString("yyyyMMdd") + "']"; 
} 
} 

이 쿼리를 사용하여 데이터를 표시하지만 빈 데이터가 표시됩니다.

Answer 1

나는 데자뷰의 느낌을 얻고 있습니다. 그냥 answer this question for you 아니 었습니까? 이 숙제는

strXpathQuery = "/AppXmlLogWritter/LogData[substring(LogDateTime, 1, 8) > " + 
    dateTimePickerFromDate.Value.ToString("yyyyMMdd") + 
    " and substring(LogDateTime, 1, 8) <= " + 
    dateTimePickerToDate.Value.ToString("yyyyMMdd") + "]"; 

또는 좀 더 잘

strXpathQuery = 
    string.Format("/AppXmlLogWritter/LogData[substring(LogDateTime, 1, 8) > {0:yyyyMMdd} and substring(LogDateTime, 1, 8) <= {1:yyyyMMdd}]", 
    dateTimePickerFromDate.Value, dateTimePickerToDate.Value);