ASP. NET dropdownlist with XML databinding

Last Update:2018-12-05 Source: Internet

Author: User

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First, this individual's XML file looked like this:
<? XML version = "1.0" encoding = "UTF-8"?>
<Companytype>
<Option value = "Agricultural" name = "Agricultural"/>
<Option value = "apparel" name = "apparel"/>
<Option value = "beverages" name = "beverages"/>
<Option value = "Building Products" name = "Building Products"/>
</Companytype>
Obviusly, this looks more like the HTML you 'd have in the actual ListBox itself, and doesn't lend itself well to databinding. so the first thing I did was rewrite the XML so that it cocould be loaded into a dataset and used more efficiently. following is the revised code for "xmldroplist. XML ":
<? XML version = "1.0" encoding = "UTF-8"?>
<Companytypes>
<Companytype>
<Value> agricultural </value>
<Name> agricultural </Name>
</Companytype>
<Companytype>
<Value> apparel </value>
<Name> apparel </Name>
</Companytype>
<Companytype>
<Value> beverages </value>
<Name> beverages </Name>
</Companytype>
<Companytype>
<Value> building products </value>
<Name> building products </Name>
</Companytype>
</Companytypes>
Finally, I pieced together the most basic code to create the server control on the page, load the XML into a dataset, and use dynamic databinding to populate the dropdown ListBox. following is the code for "xmldropdownlist. aspx ":
<% @ Import namespace = "system. Data" %>
<% @ Import namespace = "system. xml" %>
<% @ Import namespace = "system. xml. XPath" %>
<% @ Import namespace = "system. xml. XSL" %>
<% @ Import namespace = "system. Io" %>
<Script language = "C #" runat = "server">
Void page_load (Object sender, eventargs e ){
If (! Ispostback ){
Binddropdown ();
}
}

Void binddropdown (){
String url = "http: // localhost/ASP. NET/xmldroplist. xml ";
Dataset DS = new dataset ();
DS. readxml (URL );
Customers. datasource = Ds. Tables [0];
Customers. datatextfield = Ds. Tables [0]. Columns [0]. tostring ();
Customers. datavaluefield = Ds. Tables [0]. Columns [1]. tostring ();
Customers. databind ();
// Next 2 lines show way to set select item text and value...
// Customers. Items. insert (0, new listitem ("testvalue "));
// Customers. items [0]. value = "84 ";
// Next line shows another way but using an existing item...
// Customers. selectedindex = 2;

}
</SCRIPT>
<HTML>
<Body bgcolor = "# ffffff">
<Form runat = "server" id = "form1">
<B> select a company type to view: </B>
<Asp: dropdownlist id = "customers" runat = "server"/>
</Form>
</Body>
</Html>
When you run this page you'll get your dropdown ListBox with all the values in it, and if you view source you'll see that both the datatextfield and the datavaluefield properties have been translated into their proper places in each <option> element.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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ASP. NET dropdownlist with XML databinding

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