c#

Validation of XML with XSD with C#

Posted Sun, 10/18/2009 - 17:34 by jayzeng

So you seen the following warning message?

Warning 1 'System.Xml.XmlValidatingReader' is obsolete: 'Use XmlReader created by XmlReader.Create() method using appropriate XmlReaderSettings instead. http://go.microsoft.com/fwlink/?linkid=14202' filename.cs 225 13 MonitoringFramework

private static bool isValidXML(string sXmlPath, string sXsdPath)
{
	bool isValid = true;
	XmlTextReader xReader = new XmlTextReader(sXmlPath);
	XmlValidatingReader xValidator = new XmlValidatingReader(xReader);
	xValidator.ValidationType = ValidationType.Schema;
	xValidator.Schemas.Add(null, sXsdPath);
	try
	{
		while (xValidator.Read()){}
	}
	catch (Exception e)
	{
		isValid = false;
	}
	return isValid;
}

The above code produces the following warning:
System.Xml.XmlValidatingReader' is obsolete

What is the solution? Below is my take on this problem

public static Boolean isValidXml(string sXmlPath, string sXsdPath)
{ 
	bool isValid = true;
	try
	{                
		XmlReaderSettings settings = new XmlReaderSettings();
		settings.Schemas.Add("", StringToXmlReader(sXsdPath));                
		settings.ValidationType = ValidationType.Schema;
		XmlDocument document = new XmlDocument();
		document.Load(sXmlPath);
		XmlReader rdr = XmlReader.Create(new StringReader(document.InnerXml), settings);
		while (rdr.Read()){}
	}
	catch
	{
		isValid = false;
	}
	return isValid;
}

private static XmlReader StringToXmlReader(string input)
{
	return XmlReader.Create(new MemoryStream(Encoding.UTF8.GetBytes(input)));
}

How to get file extension in C#

Posted Sat, 10/17/2009 - 18:41 by jayzeng

It looks like this is a fairly popular interview question, particularly in junior or entry level .Net developer positions.

While there are tons way to do this, I am listing two common approaches.

  • The most common way is string manipulation: 
    string file = "abc.xml";
Console.WriteLine(file.Substring(file.LastIndexOf(".") + 1));

/// Returns xml
  • .Net also has native class Path allows you to get file extension: 
    /// Because Path.GetExtension returns extension ends with a dot, so you may want to get rid of it. 
string file = "abc.xml";
Path.GetExtension(file).Replace(".", "")
/// Returns xml

Path also has a list of other handy file IO methods:

  • ChangeExtension(string path, string extension)
  • GetPathRoot(string path);
  • GetDirectoryName(string path);
  • GetExtension(string path);
  • GetFileName(string path);
  • GetFileNameWithoutExtension(string path);
  • GetFullPath(string path);
  • GetInvalidFileNameChars();
  • GetInvalidPathChars();
  • GetPathRoot(string path);
  • GetRandomFileName();
  • GetTempFileName();
  • GetTempPath();
  • HasExtension(string path);
  • IsPathRooted(string path);

More details are available at http://msdn.microsoft.com/en-us/library/system.io.path.aspx

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