从xml中检索关于用户输入的数据，并从输入列表中选择用户

时间：2009-08-24 06:35:12

标签： .net datagridview linq-to-xml

几周前我刚刚开始学习Visual Studio，一切都在我脑海中。你能给我一份我用来格式化日期栏和价格栏的代码吗？我似乎也没有得到gridview来显示复选框。我被困了。我正在使用visual studio 2008，并希望从xml文件中提取ROOM_COST, DATE_TO, ROOM_TYPE, LOCATION, SMOKING, RESTAURANT AND NO_OF_PEOPLE COLUMNS。用户现在应该能够选择满足其要求的用户。这是我的xml文件和我的linq到xml查询的副本。

<?xml version="1.0" standalone="yes"?>
<NewDataSet>
  <xs:schema id="NewDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:msprop="urn:schemas-microsoft-com:xml-msprop">
    <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element name="Table">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="ROOM_ID" msprop:OraDbType="111" type="xs:short" minOccurs="0" />
                <xs:element name="SMOKING" msprop:OraDbType="126" type="xs:string" minOccurs="0" />
                <xs:element name="NO_OF_PEOPLE" msprop:OraDbType="111" type="xs:short" minOccurs="0" />
                <xs:element name="ROOM_COST" msprop:OraDbType="108" type="xs:double" minOccurs="0" />
                <xs:element name="ROOM_TYPE" msprop:OraDbType="126" type="xs:string" minOccurs="0" />
                <xs:element name="ROOM_DESC" msprop:OraDbType="126" type="xs:string" minOccurs="0" />
                <xs:element name="BOOKING_ID" msprop:OraDbType="111" type="xs:short" minOccurs="0" />
                <xs:element name="DATE_FROM" msprop:OraDbType="106" type="xs:dateTime" minOccurs="0" />
                <xs:element name="DATE_TO" msprop:OraDbType="106" type="xs:dateTime" minOccurs="0" />
                <xs:element name="HOTEL_AREA" msprop:OraDbType="126" type="xs:string" minOccurs="0" />
                <xs:element name="HOTEL_NAME" msprop:OraDbType="126" type="xs:string" minOccurs="0" />
                <xs:element name="RESTAURANT" msprop:OraDbType="126" type="xs:string" minOccurs="0" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:complexType>
    </xs:element>
  </xs:schema>
  <Table>
    <ROOM_ID>101</ROOM_ID>
    <SMOKING>N</SMOKING>
    <NO_OF_PEOPLE>1</NO_OF_PEOPLE>
    <ROOM_COST>29.990000000000002</ROOM_COST>
    <ROOM_TYPE>SINGLE ROOM</ROOM_TYPE>
    <ROOM_DESC>ONE BED, MIRROR, DESK, COUCH</ROOM_DESC>
    <BOOKING_ID>300</BOOKING_ID>
    <DATE_FROM>2008-01-02T00:00:00+00:00</DATE_FROM>
    <DATE_TO>2008-01-04T00:00:00+00:00</DATE_TO>
    <HOTEL_AREA>WOLVERHAMPTON</HOTEL_AREA>
    <HOTEL_NAME>LEVELS</HOTEL_NAME>
    <RESTAURANT>N</RESTAURANT>
  </Table>
  <Table>
    <ROOM_ID>105</ROOM_ID>
    <SMOKING>Y</SMOKING>
    <NO_OF_PEOPLE>4</NO_OF_PEOPLE>
    <ROOM_COST>59.99</ROOM_COST>
    <ROOM_TYPE>EN-SUITE</ROOM_TYPE>
    <ROOM_DESC>KINGSIZE BED, MIRROR, GARDEN</ROOM_DESC>
    <BOOKING_ID>301</BOOKING_ID>
    <DATE_FROM>2009-01-02T00:00:00+00:00</DATE_FROM>
    <DATE_TO>2009-01-15T00:00:00+00:00</DATE_TO>
    <HOTEL_AREA>STAFFORD</HOTEL_AREA>
    <HOTEL_NAME>HILTON</HOTEL_NAME>
    <RESTAURANT>Y</RESTAURANT>
  </Table>
  <Table>
    <ROOM_ID>111</ROOM_ID>
    <SMOKING>N</SMOKING>
    <NO_OF_PEOPLE>10</NO_OF_PEOPLE>
    <ROOM_COST>49.99</ROOM_COST>
    <ROOM_TYPE>HOSTEL ROOM</ROOM_TYPE>
    <ROOM_DESC>DOUBLE-DECKER BED, DRAWER</ROOM_DESC>
    <BOOKING_ID>302</BOOKING_ID>
    <DATE_FROM>2009-03-02T00:00:00+00:00</DATE_FROM>
    <DATE_TO>2009-06-15T00:00:00+01:00</DATE_TO>
    <HOTEL_AREA>WOLVERHAMPTON</HOTEL_AREA>
    <HOTEL_NAME>LEVELS</HOTEL_NAME>
    <RESTAURANT>N</RESTAURANT>
  </Table>
  <Table>
    <ROOM_ID>113</ROOM_ID>
    <SMOKING>N</SMOKING>
    <NO_OF_PEOPLE>1</NO_OF_PEOPLE>
    <ROOM_COST>29.990000000000002</ROOM_COST>
    <ROOM_TYPE>SINGLE ROOM</ROOM_TYPE>
    <ROOM_DESC>ONE BED, MIRROR, DESK, COUCH</ROOM_DESC>
    <BOOKING_ID>303</BOOKING_ID>
    <DATE_FROM>2009-09-02T00:00:00+01:00</DATE_FROM>
    <DATE_TO>2009-09-05T00:00:00+01:00</DATE_TO>
    <HOTEL_AREA>BASWICH</HOTEL_AREA>
    <HOTEL_NAME>DAYSTAR</HOTEL_NAME>
    <RESTAURANT>Y</RESTAURANT>
  </Table>
  <Table>
    <ROOM_ID>103</ROOM_ID>
    <SMOKING>Y</SMOKING>
    <NO_OF_PEOPLE>2</NO_OF_PEOPLE>
    <ROOM_COST>39.99</ROOM_COST>
    <ROOM_TYPE>DOUBLE ROOM</ROOM_TYPE>
    <ROOM_DESC>DOUBLE BED, MIRROR, SEETEE</ROOM_DESC>
    <BOOKING_ID>304</BOOKING_ID>
    <DATE_FROM>2009-08-21T00:00:00+01:00</DATE_FROM>
    <DATE_TO>2009-08-25T00:00:00+01:00</DATE_TO>
    <HOTEL_AREA>CANNOCK</HOTEL_AREA>
    <HOTEL_NAME>MIDAS</HOTEL_NAME>
    <RESTAURANT>N</RESTAURANT>
  </Table>
  <Table>
    <ROOM_ID>107</ROOM_ID>
    <SMOKING>Y</SMOKING>
    <NO_OF_PEOPLE>10</NO_OF_PEOPLE>
    <ROOM_COST>49.99</ROOM_COST>
    <ROOM_TYPE>HOSTEL ROOM</ROOM_TYPE>
    <ROOM_DESC>DOUBLE-DECKER BED, DRAWER</ROOM_DESC>
    <BOOKING_ID>305</BOOKING_ID>
    <DATE_FROM>2009-08-25T00:00:00+01:00</DATE_FROM>
    <DATE_TO>2009-08-31T00:00:00+01:00</DATE_TO>
    <HOTEL_AREA>STOKE</HOTEL_AREA>
    <HOTEL_NAME>MIVI</HOTEL_NAME>
    <RESTAURANT>Y</RESTAURANT>
  </Table>
  <Table>
    <ROOM_ID>141</ROOM_ID>
    <SMOKING>N</SMOKING>
    <NO_OF_PEOPLE>2</NO_OF_PEOPLE>
    <ROOM_COST>39.99</ROOM_COST>
    <ROOM_TYPE>DOUBLE ROOM</ROOM_TYPE>
    <ROOM_DESC>DOUBLE BED, MIRROR, SEETEE</ROOM_DESC>
    <HOTEL_AREA>BASWICH</HOTEL_AREA>
    <HOTEL_NAME>DAYSTAR</HOTEL_NAME>
    <RESTAURANT>Y</RESTAURANT>
  </Table>
  <Table>
    <ROOM_ID>109</ROOM_ID>
    <SMOKING>Y</SMOKING>
    <NO_OF_PEOPLE>1</NO_OF_PEOPLE>
    <ROOM_COST>19.990000000000002</ROOM_COST>
    <ROOM_TYPE>BED-SIT</ROOM_TYPE>
    <ROOM_DESC>ONE BED, DESK</ROOM_DESC>
    <HOTEL_AREA>CANNOCK</HOTEL_AREA>
    <HOTEL_NAME>MIDAS</HOTEL_NAME>
    <RESTAURANT>N</RESTAURANT>
  </Table>
</NewDataSet>

XDocument xmlDoc = XDocument.Load(Server.MapPath("xml/data1.xml"));

        var hotels = from hotel in xmlDoc.Descendants("Table")
                     where Double.Parse(pplTextBox.Text) <= Double.Parse(hotel.Element("NO_OF_PEOPLE").Value)
                     //&& DateTime.Parse(DateTextFrom.Text)>DateTime.Parse(hotel.Element("DATE_TO").Value)
                     select new
                     {
                         RoomCost = hotel.Element("ROOM_COST").Value,
                         RoomType = hotel.Element("ROOM_TYPE").Value,
                         Hotel = hotel.Element("HOTEL_NAME").Value,
                         NoOfGuest = hotel.Element("NO_OF_PEOPLE").Value,
                         Smoking = hotel.Element("SMOKING").Value,
                         Restaurant = hotel.Element("RESTAURANT").Value,
                         Location = hotel.Element("HOTEL_AREA").Value,
                         AvailableDate = hotel.Element("DATE_TO").Value

                     };


        GridView1.DataSource = hotels.ToList();

        GridView1.DataBind();

提前致谢。

1 个答案:

答案 0 :(得分：0)

这将为您提供一个具有强类型值的对象，允许格式化：

select new { 
    RoomCost = (decimal)hotel.Element("ROOM_COST"), 
    RoomType = (string)hotel.Element("ROOM_TYPE"), 
    Hotel = (string)hotel.Element("HOTEL_NAME"), 
    NoOfGuest = (int)hotel.Element("NO_OF_PEOPLE"), 
    Smoking = ( hotel.Element("SMOKING").Value == "Y" ), 
    Restaurant = ( hotel.Element("RESTAURANT").Value == "Y" ), 
    Location = (string)hotel.Element("HOTEL_AREA"), 
    AvailableDate = (DateTime)hotel.Element("DATE_TO")
};

此外，我建议先解析并验证用户输入，然后将查询更改为：

var query = from hotel in data.Descendants("Table")
            where numberOfPeople <= (double)hotel.Element("NO_OF_PEOPLE")
            && dateNeeded > (DateTime)hotel.Element("DATE_FROM")
            && dateNeeded < (DateTime)hotel.Element("DATE_TO")

创建一个名为“numberOfPeople”的变量并将输入解析为，与“dateNeeded”相同，警告用户他们的输入是否无法解析...不想用一些奇怪的Linq到Xml呈现它们错误：）

相关问题
最新问题