[英]Using C# LINQ to Search an XML file
I'm currently reviewing some tutorials using LINQ and XML with ASP.NET C#.我目前正在复习一些使用 LINQ 和 XML 和 ASP.NET C# 的教程。 I want to create a search page that reads an xml file and return the results in the Grid View after a button is clicked.我想创建一个搜索页面,该页面读取 xml 文件并在单击按钮后在网格视图中返回结果。
This is the XML File I'm attempting to search:这是我试图搜索的 XML 文件:
<?xml version="1.0"?>
<catalog>
<book id="bk101">
<author>Gambardella, Matthew</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications
with XML.</description>
</book>
<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen
of the world.</description>
</book>
</catalog>
I have a Text box and search button:我有一个文本框和搜索按钮:
<asp:TextBox ID="searchtxt" runat="server" /> <asp:Button ID="search_btn" Text="Search" runat="server" OnClick="search_btn_Click" />
...the Grid View: ...网格视图:
<div>
<asp:GridView ID="gvSearch" runat="server" EmptyDataText="No Results found" Width="618px" AutoGenerateColumns="false" CssClass="gridviewsearch" GridLines="None">
<Columns>
<asp:TemplateField HeaderText="Keyword">
<ItemTemplate>
<%# Eval("author")%>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Results">
<ItemTemplate>
<%# Eval("title")%>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="URL">
<ItemTemplate>
<%# Eval("genre")%>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
...The code behind the button: ...按钮背后的代码:
protected void search_btn_Click(object sender, EventArgs e)
{
//1 .create a reference of XDocument
XDocument xdoc = XDocument.Load("database\\books.xml");
xdoc.Descendants("book").Select(p => new
{
author = p.Attribute("author").Value,
title = p.Element("title").Value,
genre = p.Attribute("genre").Value
}) .OrderBy(p => p.author).ToList().ForEach(p =>
{
gvSearch.DataSource = xdoc;
gvSearch.DataBind();
});
}
...My question is, how do I implement the id: searchtxt into the back-end of the the code? ...我的问题是,如何将 id: searchtxt 实现到代码的后端? In addition, am I on the right path, set-up and syntax-wise in accomplishing the task?此外,我在完成任务时是否走在正确的道路、设置和语法上?
identify catalog descendants
and iterate over book elements
识别目录descendants
并迭代书籍elements
var term = "rain";
var query = from element in document
.Descendants("catalog")
.Elements("book")
let book = new
{
id = element.Attribute("id").Value,
author = element.Element("author").Value,
title = element.Element("title").Value,
genre = element.Element("genre").Value
}
where book.author.ToLower().Contains(term)
|| book.title.ToLower().Contains(term)
|| book.genre.ToLower().Contains(term)
select book;
that would give you那会给你
id|author|title|genre
bk102|Ralls, Kim|Midnight Rain|Fantasy
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