Archive for category .net
WCF 404.3 Errors
I built a WCF service recently which would run fine in the visual studio test web server, but when i tried to actually hit it from real life IIS7 also on my local box, i receievd the following error:
HTTP Error 404.3 – Not Found
The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.
Luckily, i found the solution on David Waddleton’s blog and it was as simple as turning on a windows feature in add remove programs- on my vista box i had to go to Control Panel > Programs and features > Turn on/ off Windows features > Microsoft.NET framework 3.0 and tick the WCF activitation options!
How to run SQL Profiler against local SQL Express instances
Posted by shawson in .net, SQL Server on December 9th, 2009
I’m building a project using entity framework and wanted to ensure it wasn’t going mental and spamming the database with more queries than it should- this requires SQL Profiler, but i didn’t know how to connect it to my local instance of sql (I had just added an MDB file to the app’s app_data folder, so it was running via local sql express)
Turns out it’s easy- you just connect to .\SQLEXPRESS database and then execute this query against the master database;
SELECT owning_principal_name, instance_pipe_name FROM sys.dm_os_child_instances
From the results you will be able fish out the “named pipe” that you can just put into the server name box when connecting with profiler.
Sql Profiler connection dialogue
via Brad Wilson: Profiling SQL Server Express User Instances.
Properties getting “k__BackingField” appended to their name in the WSDL file
Posted by shawson in .net, C#.net, WCF, Web Services on December 7th, 2009
I was finding k__backingField was being appended to all my object properties when exposed via my a WCF service, in the WSDL. The solution it turns out was simple- just had to make my class a [DataContract] and mark the properties as [DataMember].
via WCF Data Contracts and “k__BackingField” Property Naming – Nathan Bridgewater.
Making your WCF Service compatible with legacy .net 1.1 applications
Posted by shawson in .net, C#.net, WCF, Web Services on December 7th, 2009
I’m building an error tracking service which all our future web project will report to, so we can track and tag all our various systems problems from one place- this is currently done with email which is a bit of a nightmare!
According to Microsoft, traditional ASMX web services are now considered “Legacy technology” (!) so I thought I would buite the bullet and build the new services using WCF.
This was fairly painless until I tried to consume the web service in some old .net 1.1 web apps- when trying to add the web reference I received this error message;
Web ReferenceslocalhostReference.map(1): Custom tool warning: DiscoCodeGenerator unable to initialize code generator. No code generated.
I found a great article over on the MSDN – and all it takes is a small change to the web.config, fiddling with, my old friend, the httpBindings.
I had to swap out the default bindings put in by .net;
<endpoint address="" binding="wsHttpBinding" contract="HachetteErrorTracker.IErrorLog">
<identity>
<dns value="localhost"/>
</identity>
</endpoint>
For this one;
<endpoint
address=""
binding="basicHttpBinding" bindingNamespace="http://errortracker.localhost/"
contract="HachetteErrorTracker.IErrorLog"
/>
How to: Configure WCF Service to Interoperate with ASP.NET Web Service Clients.
Stop the “web.config” being inherited by child applications in sub folders
We recently had an issue setting a .net microsite live off the back of an existing domain, hosting another .net site.
This was due to the web.config being inherited to the child- we would be hit with errors like this;
Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.
Parser Error Message: Could not load file or assembly ‘UrlRewritingNet.UrlRewriter’ or one of its dependencies. The system cannot find the file specified. (d:ProjectsVSAspDotNetFaqProjectWebsiteweb.config line 89)
Source Error:
Line 88: <httpModules> Line 89: <add name="UrlRewriteModule" type="UrlRewritingNet.Web.UrlRewriteModule, UrlRewritingNet.UrlRewriter"/> Line 90: <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> Line 91: </httpModules>
This is because a module was defined in the parent site which doesn’t exist in the child, but because it’s inheriting it still tries to load it. We would also get errors complaining that modules have already been defined.
I tried initially, manually adding <remove name=”blah” /> to the child web.config to remove the entries in the child web.config it thought were defined twice, but after putting in about 10 of these and it still not working it started to get a bit ridiculous!
The trick, we found on google (How to disable web.config Inheritance for Child Applications in Subfolders in ASP.NET?) is to stop the web.config from inheriting in the top level web.config;
<location path=“.“ inheritInChildApplications=“false“>
<system.web>
…
</system.web>
</location>
This stops anything being migrated down to the children, allowing you to have your full web.config in the child site, unaffected by the parent! — Make sure you don’t put this around anything else though; just the system.web section!
URL Routing with ASP.NET 4 Web Forms (VS 2010 and .NET 4.0 Series) – ScottGu’s Blog
I was quite excited (what have I become!?) to read about the URL Routing stuff from MVC, which is now available in WebForms as of ASP.net 4.0- specifically the ability to retreive a URL back from the Route engine from the code behind!
URL Routing with ASP.NET 4 Web Forms (VS 2010 and .NET 4.0 Series) – ScottGu’s Blog.
Linq Distinct!
I have a List of books- each book has a category – i want to find out all the unique categories involved, given a list of books- i knew i could do this with linq, but not quite sure how!
It turned out to be easy..
List<Category> categories = _books.Select(i => i.Category).Distinct();
There was a minor complication however- Distinct obviously needs to be able to compare different instances of Category- you can supply a delegate to a custom EquityComparer class- otherwise it will simply check if this is the same instance of the object, which will (probably) always come back false rendering your distinct useless. So i created this;
public class CategoryComparer : IEqualityComparer<Category>
{
public bool Equals(Category x, Category y)
{
return x.Id == y.Id;
}
public int GetHashCode(Category obj)
{
return obj.Id.GetHashCode();
}
}
then updated my linq to use it..
List<Category> categories = _books.Select(i => i.Category).Distinct(new CategoryComparer());
A complete list of .NET Serializers in 3.5
Just saw this pop up in my Google Reader and though I would blog it as it is tres useful!
.NET Serializers – Development With A Dot.
As of version 3.5 SP1, .NET comes along with the following serializers:
There isn’t, however, a common interface for all of these serializers, and, in fact, they have quite different requirements.
The base interfaces are:
- System.Runtime.Serialization.IFormatter: for BinaryFormatter, SoapFormatter, NetDataContractSerializer and ObjectStateFormatter;
- System.Runtime.Serialization.XmlObjectSerializer: for DataContractSerializer, DataContractJsonSerializer and NetDataContractSerializer;
- XmlSerializer doesn’t have any interface that specifies its behavior.
The interfaces that can be used to control the serialization process are:
- System.Runtime.Serialization.ISerializable: for all the IFormatter serializers;
- System.Xml.Serialization.IXmlSerializable: for XmlSerializer.
Also, there are a couple of attribute classes that can be used to control the serialization process:
- System.Xml.Serialization.SoapAttributeAttribute (XmlSerializer)
- System.Xml.Serialization.SoapElementAttribute (XmlSerializer)
- System.Xml.Serialization.SoapEnumAttribute (XmlSerializer)
- System.Xml.Serialization.SoapIgnoreAttribute (XmlSerializer)
- System.Xml.Serialization.SoapIncludeAttribute (XmlSerializer)
- System.Xml.Serialization.SoapTypeAttribute (XmlSerializer)
- System.Xml.Serialization.XmlAnyAttribute (XmlSerializer)
- System.Xml.Serialization.XmlAnyElementAttribute (XmlSerializer)
- System.Xml.Serialization.XmlArrayAttribute (XmlSerializer)
- System.Xml.Serialization.XmlArrayItemAttribute (XmlSerializer)
- System.Xml.Serialization.XmlAttributeAttribute (XmlSerializer)
- System.Xml.Serialization.XmlChoiceIdentifierAttribute (XmlSerializer)
- System.Xml.Serialization.XmlElementAttribute (XmlSerializer)
- System.Xml.Serialization.XmlEnumAttribute (XmlSerializer)
- System.Xml.Serialization.XmlIgnoreAttribute (XmlSerializer)
- System.Xml.Serialization.XmlIncludeAttribute (XmlSerializer)
- System.Xml.Serialization.XmlRootAttribute (XmlSerializer)
- System.Xml.Serialization.XmlTypeAttribute (XmlSerializer)
- System.Runtime.Serialization.CollectionDataContractAttribute (XmlObjectSerializer)
- System.Runtime.Serialization.DataContractAttribute (XmlObjectSerializer)
- System.Runtime.Serialization.DataMemberAttribute (XmlObjectSerializer)
- System.Runtime.Serialization.EnumMemberAttribute (XmlObjectSerializer)
- System.Runtime.Serialization.IgnoreDataMemberAttribute (XmlObjectSerializer)
Note that the Soap* attributes are only considered if the SoapBindingStyle.Document is set for the Style property of the binding, in ASP.NET Web Services, otherwise, its the Xml* attributes.
Deep Copy Array/ Collection/ etc using serialization
A useful snippet of code I used in a web services project a while ago which i just stumbled back across recently- allows you to make a deep copy of an array, where you would normally get a shallow copy, stopping you from manipulating it independently from the source. This gives you a completely fresh and separate copy. The original is serialised to a memory, then a new instance created from the serialised representation (so obviously if it’s an array of custom objects, those objects will need to be marked serializable)
OrderItem[] order_items_clone;
using( MemoryStream ms = new MemoryStream())
{
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
formatter.Serialize(ms,order_items);
ms.Seek(0 , SeekOrigin.Begin);
order_items_clone = (OrderItem[])formatter.Deserialize(ms);
}
Scott Klueppel’s Blog – Error Log RSS Feed
Sam pointed me to an article showing a really nice way to deal with error logging; as opposed to filling a debug mail box with 100’s of mails that will soon become unmanageably large, have the error’s logged to a database, then published via RSS!
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