c# .net core barcode generator

c# .net core barcode generator

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You can use LINQ to query XML data sources too. In this case, you actually use the language features of LINQ to write your queries. However, to work with the data, you use LINQ to XML (defined in System.Xml.Linq). This namespace makes working with XML data easier and exposes your XML so that LINQ can query the XML data. For example, the following code uses the XElement class to load an XML file that can easily be queried by LINQ.

With the RequiredFieldValidator, CompareValidator, RangeValidator, and RegularExpressionValidator controls, most of your validation needs are met. These validators can handle many different types of fields. But suppose you needed something a little different That s where CustomValidator comes in. The CustomValidator control can be used whenever the other stock validators don t do the job. For example, if instead of just comparing a value against a fixed value or a regular expression you want to validate the value entered against a database, CustomValidator is one way to go. The code used to specify CustomValidator in ValidatorTest.aspx in Listing 5-4 is shown here: <ASP:CustomValidator ID="ValCustom" runat="server" ControlToValidate="txtCustom" OnServerValidate="CustomServerVal" Display="Static" > Enter "Hello". Case-Sensitive. </ASP:CustomValidator> One thing that stands out in this example in comparison with previous example validators is that rather than using a single tag to open and close the validator and specifying the error message as an attribute (the ErrorMessage attribute), here I enter the error message I want associated with the validator between the start and end tags. There s no practical difference between the two methods of specifying the error message. A new attribute is included with CustomValidator in this example, OnServerValidate. This attribute points to a server-side function that takes two parameters in this example, the function CustomServerVal, shown here: void CustomServerVal (object source, ServerValidateEventArgs args) { try { if ( args.Value.Equals("Hello") ) { Msg.Text="ServerValidation called and TRUE returned."; args.IsValid=true; } else { Msg.Text="ServerValidation called and FALSE returned."; args.IsValid=false; } } catch {

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Sample of Visual Basic Code Dim empXml As XElement = XElement.Load("c:\code\employees.xml") Sample of C# Code XElement empXml = XElement.Load(@"c:\code\employees.xml");

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You can also use the XElement class to actually create XML on the fly. The following code shows just that. Notice that the Visual Basic code uses the Visual Basic XML literals feature to create the XML in code. The C# example relies on the XElement constructors for creating the XML. Notice also the LINQ query against the XML. This is a query of a collection of XElement objects. To access actual items within the XML, you use the Descendants or Element properties.

Sample of Visual Basic Code Dim empXml As XElement = New XElement( <Employees> <Employee> <ID>111</ID> <FirstName>Michael</FirstName> <Department>IT Department</Department> <City>Pittsburgh</City> </Employee> <Employee> <ID>112</ID> <FirstName>Hank</FirstName> <Department>IT Department</Department> <City>Redmond</City> </Employee> <Employee> <ID>113</ID> <FirstName>Benjamin</FirstName> <Department>Human Resources</Department> <City>Chicago</City> </Employee> <Employee> <ID>114</ID> <FirstName>Gail</FirstName> <Department>Marketing</Department> <City>Ann Arbor</City> </Employee> </Employees>) Dim empQuery As IEnumerable(Of XElement) = From emp In empXml.Descendants("Employee") Where emp.Element("FirstName").Value.Length > 5 Select emp

Sample of C# Code XElement empXml = new XElement("Employees", new XElement("Employee", new XElement("ID", "111"), new XElement("FirstName", "Michael"), new XElement("Department", "IT Department"), new XElement("City", "Pittsburgh") ), new XElement("Employee", new XElement("ID", "112"), new XElement("FirstName", "Hank"), new XElement("Department", "IT Department"), new XElement("City", "Redmond") ), new XElement("Employee", new XElement("ID", "113"), new XElement("FirstName", "Benjamin"), new XElement("Department", "Human Resources"), new XElement("City", "Chicago") ), new XElement("Employee", new XElement("ID", "114"), new XElement("FirstName", "Gail"), new XElement("Department", "Marketing"), new XElement("City", "Ann Arbor") ) ); IEnumerable<XElement> empQuery = from emp in empXml.Descendants("Employee") where emp.Element("FirstName").Value.Length > 5 select emp;

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