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troubleshooting Question

xml schema validation

Avatar of Meir Rivkin
Meir RivkinFlag for Israel asked on
.NET ProgrammingC#
5 Comments1 Solution895 ViewsLast Modified:
i'm using configuration file and xsd file for my app installer.

basically, the config is used to perform pre/post installation procedures when upgrading application version:
ExistInstall - current installation
NewInstall - upgrade installation
PreInstall - prior installation/uninstallation
PostInstall - after installation/uninstallation

PreInstall in ExistInstall element is procedure/s to take place before uninstall current installation
PostInstall in NewInstall element is procedure/s to take place after upgrade installation complete.

Q: i want to enforce minOccurs=0 and MaxOccurs=1 to the following elements:

my schema looks valid but even if i duplicate one of the elements, the validation still returns true.



using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Xml.Linq;
using System.Xml.Schema;

namespace XMLValidatorNS
    public class XMLValidator
        // Validation Error Message
        static List<string> errorMessage = new List<string>();

        /// <summary>
        /// Gets the error message.
        /// </summary>
        /// <value>The error message.</value>
        public static List<string> ErrorMessage
            get { return XMLValidator.errorMessage; }

        /// <summary>
        /// Validations the handler.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="args">The <see cref="System.Xml.Schema.ValidationEventArgs"/> instance containing the event data.</param>
        public static void ValidationHandler(object sender,
                                             ValidationEventArgs args)

        /// <summary>
        /// Determines whether the specified XML is validated against schema.
        /// </summary>
        /// <param name="xml">The XML.</param>
        /// <param name="schema">The schema.</param>
        /// <returns>
        /// 	<c>true</c> if the specified XML is validated; otherwise, <c>false</c>.
        /// </returns>
        public static bool IsValidated(string xml, string schema)
            bool result = false;
                XDocument xdoc = XDocument.Load(xml);
                XmlSchemaSet schemas = new XmlSchemaSet();
                schemas.Add("", XmlReader.Create(schema));

                StringBuilder sb = new StringBuilder();
                xdoc.Validate(schemas, (o, e) =>
                }, true);

                result = true;
            catch (Exception error)

            return result;
Avatar of Meir Rivkin
Meir RivkinFlag of Israel imageFull stack Software Engineer

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