Skip to main content

Cum sa scriem un xPath cand avem definit si un namespace

Cand vrem sa aplicam un xPath pe un xml ce conține si un namespace lucrurile se complica.
De exemplu daca pornim de la urmatorul xml:
<?xml version="1.0" ?>
<x xmlns="">
Daca dorim sa aplicam un xPath am scrie un cod asemanator cu acesta:
var xmlDoc = new XmlDocument();
var nodes = xmlDoc.SelectNodes(@"/x/y");
Din pacate din cauza ca in xml este definit un namespace, acest lucru nu o sa functioneze. Numarul de noduri returnate va fi mereu 0. Pentru a putea rezvolta aceasta problema trebuie sa adaugam si un namespace, codul rezultat ajungand sa arate in felul urmator:
var xmlDoc = new XmlDocument();
var nameSpaceManager = new XmlNamespaceManager(xmlDoc.NameTable);
var nodes = xmlDoc.SelectNodes(@"/nm:x/nm:y",nameSpaceManager);
Dezavantajul la aceasta solutie este modul in care suntem nevoiti sa scriem xPath-ul. La fiecare nod trebuie sa adaugam "nm". O alta varianta este sa ignoram in totalitate namespace-ul. Acest lucru il putem face cand incarcam documentul.
var xmlDoc = new XmlDocument();
using (XmlTextReader xmlTextReader = new XmlTextReader(path))
xmlTextReader.Namespaces = false;
var nodes = xmlDoc.SelectNodes(@"/x/y");



Popular posts from this blog

How to check in AngularJS if a service was register or not

There are cases when you need to check in a service or a controller was register in AngularJS.
For example a valid use case is when you have the same implementation running on multiple application. In this case, you may want to intercept the HTTP provider and add a custom step there. This step don’t needs to run on all the application, only in the one where the service exist and register.
A solution for this case would be to have a flag in the configuration that specify this. In the core you would have an IF that would check the value of this flag.
Another solution is to check if a specific service was register in AngularJS or not. If the service was register that you would execute your own logic.
To check if a service was register or not in AngularJS container you need to call the ‘has’ method of ‘inhector’. It will return TRUE if the service was register.
if ($injector.has('httpInterceptorService')) { $httpProvider.interceptors.push('httpInterceptorService&#…

ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded

Today blog post will be started with the following error when running DB tests on the CI machine:
threw exception: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See for more information. at System.Data.Entity.Infrastructure.DependencyResolution.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName) This error happened only on the Continuous Integration machine. On the devs machines, everything has fine. The classic problem – on my machine it’s working. The CI has the following configuration:

TeamCity.NET 4.51EF 6.0.2VS2013
It seems that there …

Entity Framework (EF) TransactionScope vs Database.BeginTransaction

In today blog post we will talk a little about a new feature that is available on EF6+ related to Transactions.
Until now, when we had to use transaction we used ‘TransactionScope’. It works great and I would say that is something that is now in our blood.
using (var scope = new TransactionScope(TransactionScopeOption.Required)) { using (SqlConnection conn = new SqlConnection("...")) { conn.Open(); SqlCommand sqlCommand = new SqlCommand(); sqlCommand.Connection = conn; sqlCommand.CommandText = ... sqlCommand.ExecuteNonQuery(); ... } scope.Complete(); } Starting with EF6.0 we have a new way to work with transactions. The new approach is based on Database.BeginTransaction(), Database.Rollback(), Database.Commit(). Yes, no more TransactionScope.
In the followi…