how to convert pdf to word using asp.net c#

how to convert pdf to word document using c#

how to convert pdf to word document using c#

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Listing 9-13. Validating an XML Document with Default Validation Event Handling XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("MiddleInitial", "C"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); Console.WriteLine("Here is the source XML document:"); Console.WriteLine("{0}{1}{1}", xDocument, System.Environment.NewLine); XmlSchemaSet schemaSet = new XmlSchemaSet(); schemaSet.Add(null, "bookparticipants.xsd"); try { xDocument.Validate(schemaSet, null); Console.WriteLine("Document validated successfully."); } catch (XmlSchemaValidationException ex) { Console.WriteLine("Exception occurred: {0}", ex.Message); Console.WriteLine("Document validated unsuccessfully."); } In this example, I construct my typical XML document, except I add a MiddleInitial element to intentionally make the document invalid. I am using the schema I inferred in the previous example. Notice that for the ValidationEventHandler argument for the Validate method that I passed a null. This means that if a validation error occurs, an exception of type XmlSchemaValidationException will automatically be thrown. Here are the results: Here is the source XML document: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <MiddleInitial>C</MiddleInitial> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants>

There is no requirement that every bit of code needed to perform a transformation or query actually exist in the transformation code itself. It is possible to create helper methods that carry out more complex transformation chores. Here is some code demonstrating how you can create a helper method to break up a more complex task:

Summary

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static IEnumerable<XElement> Helper() { XElement[] elements = new XElement[] { new XElement("Element", "A"), new XElement("Element", "B")}; return(elements); } In Listing 9-7, we begin the construction of an XML tree. It creates the root node, named RootElement, in the call to the constructor. To create the child nodes, it calls a helper method named Helper. It isn t important what the helper method is doing specifically; it just matters that it is helping us build some part of our XML tree and that the call to the method can be embedded in the functional construction of the XML tree.

Exception occurred: The element 'BookParticipant' has invalid child element 'MiddleInitial'. List of possible elements expected: 'LastName'. Document validated unsuccessfully.

XElement xElement = new XElement("RootElement", Helper()); Console.WriteLine(xElement); Here are the results of this code: <RootElement> <Element>A</Element> <Element>B</Element> </RootElement> Remember, as we discussed in 7, the XElement constructor knows how to handle IEnumerable<T>, which happens to be the returned data type of our Helper method. How cool is that

That worked like a charm. It was also very simple. Not too bad. For the next example, I will validate my typical XML document, the one I used to infer the schema, against the schema I obtained by inference. Of course, since the schema was inferred from this very XML document, it should work. However, for this example, I will need a ValidationEventHandler method. Let s take a look at the one I am going to use. My ValidationEventHandler static void MyValidationEventHandler(object o, ValidationEventArgs vea) { Console.WriteLine("A validation error occurred processing object type {0}.", o.GetType().Name); Console.WriteLine(vea.Message); throw (new Exception(vea.Message)); } In that handler, I really don t do much except display the problem and throw an exception. Of course, the handling is completely up to my handler. It isn t required to throw an exception. I could choose to implement it so that it handles validation errors more gracefully, perhaps choosing to ignore any or specific errors. Let s examine an example using that handler, as shown in Listing 9-14. Listing 9-14. Successfully Validating an XML Document Against an XSD Schema XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); Console.WriteLine("Here is the source XML document:"); Console.WriteLine("{0}{1}{1}", xDocument, System.Environment.NewLine); XmlSchemaSet schemaSet = new XmlSchemaSet(); schemaSet.Add(null, "bookparticipants.xsd"); try { xDocument.Validate(schemaSet, MyValidationEventHandler); Console.WriteLine("Document validated successfully."); } catch (Exception ex) { Console.WriteLine("Exception occurred: {0}", ex.Message); Console.WriteLine("Document validated unsuccessfully."); }

There may be times when you want to suppress some nodes from being constructed for one reason or another. Perhaps some essential data is missing from the source that causes you to want to omit an element from being created, or perhaps the data is such that you want to skip it.

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