I spent this morning in trying to figure out where the system.linq.expressions namespace is. The following is what I did:
In VS 2008, Create a new C#/Smart Device/Windows Mobile 6 Professional SDK/.NET CF v3.5/Class Library
Used SqlMetal (in Program Files/Microsoft SDKs/Windows/v6.0A/Bin) to generate the data context.
Added the data context .cs file into the project.
Compile and many errors for missing namespaces: System.Data.Linq, System.Data.Linq.Mapping, System.Linq.Expressions
After some research added System.Data.Linq.dll in c:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5 (The dll was not directly listed when I choose to add reference and I used "browse" tab to finally located the one, which is for normal framework)
Compile again, less errors, but still System.Linq.Expressions namespace is missing.
The document says System.Linq.Expressions is in System.Core.dll but it seems my System.Core.dll (located in Program Files\Microsoft.NET\SDK\CompactFramework\v3.5\WindowsCE) contains much less namespace than document says.
Thanks in advance!
The Compact Framework does not support LINQ to SQL. All objects in the documentation for System.Data.Linq confirms this by being completely devoid of the "supported in the CF" icon. For example, look over at the docs for DataTable, which is supported. You'll see a little icon by each supported method/property.
You cannot "add" support by simply referencing a desktop assembly like you did in your step 5. The CF cannot consume full framework assemblies, for a variety of reasons.
Dynamic code generation (Reflection.Emit) is not available in NETCF. What this means is that a lot of features that depend on this is not available, this includes DLR (dyanmic language runtime and hence languages like IronRuby), Linq-to-SQL/
If you just want the Linq.Expressions and you are doing your own stuff with it i.e. not trying to get linq to sql working then you can use the System.Linq.Expression stuff from the db4o guys.
I am using it on my project using linq to objects.
db4o linq implementation
Related
I'm quite new to MVVMCross but I've been actively using it for two weeks, at work and in a school project, and I am really enjoying it! Unfortunately, I've been stuck on the school project for 2 days now : we're asked to do a mobile Jabber client. This is not a big deal since I started it using Matrix XMPP library, which does most of the job and is easy to use. I decided to restart my project using MVVMCross, in order to have cleaner separated code and add a Windows Phone project, but Matrix absolutely needs System.Xml.Linq, and I can't get the core PCL to compile :
The type 'System.Xml.Linq.XElement' is defined in an assembly that is not referenced.
You must add a reference to assembly 'System.Xml.Linq, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
As shown in Stuart Lodge's tutorial videos, I'm using profile 104, the the faulting dll is really present in the folder, I can't add it manually to project's references since VS prevents me from doing it (gently explaining that it's automatically loaded since .Net portable subset is included in references), I've updated and repaired my VS install "just in case"... and have no more idea left.
So, here are the questions :
is it really possible to use System.Xml.Linq with MVVMCross? or did I miss the big title explaining that what I'm trying to do is stupid?
if yes (that'd be great!) did/does someone experience the same problem? Even more interesting : did someone find a solution?
Thanks in advance!
Additional info : Windows8(x64), VS2012 Ultimate, trial license (school project...) for Xamarin.Android
UPDATE : following Stuart's answer, I compiled and ran the BestSellers sample, which uses System.Xml.Linq... without any problem. As it comes with an explicit reference to System.Xml.Linq (see first link in answer), I tried :
to delete it (and a few others) : VS holds it's promises, and really includes needed references as long as .Net Portable Subset is referenced, so everything rolls smooth.
to manually add this reference via Notepad to my .csproj : it doesn't change anything.
One thing tickles me in Stuart's answer : "perhaps it is something to do with the way the matrix uses XML.linq". Since the Matrix type I'm trying to use is just a descendant of System.Xml.Linq.XElement, which is widely used in BookViewModel.cs from sample, what could possibly be wrong with that?
"Solution" : The problem seems to be due to Matrix requiring a special version of System.Xml.Linq, which is not the one included when profile 104 for building PCL. I used file linking method as a workaround to share the core, and that works, though this is less elegant, readable, and harder to maintain...
Yes it is possible to use at least some of System.Xml.Linq
For example, see the BestSellers sample
csproj file - https://github.com/slodge/MvvmCross-Tutorials/blob/master/Sample%20-%20BestSellers/BestSellers/BestSellers/BestSellers.csproj#L49
example XML linq use - https://github.com/slodge/MvvmCross-Tutorials/blob/master/Sample%20-%20BestSellers/BestSellers/BestSellers/ViewModels/BookViewModel.cs#L44
For the problem you are seeing, I'm really not sure what the error is - perhaps it is something to do with the way the matrix uses XML.linq? You might have more luck of you open up this question to other tags like portable-class-library, XML-linq and windows-phone.
Before I begin I must admit that I am new to Xtext and the designing of DSLs. Some of my questions on this matter may be somewhat "less than intelligent".
I have created an Xtext project using the IDE, and I am simultaneously using one of the sample projects provided with Xtext as a guide to what I need to do in my language. I am seeing a lot of warnings that are making me nervous.
Apparently, when the development environment creates a new project, it somehow configures that project to use the Java 5 libraries. I am using Java 6, and as a result I get warnings saying that my project is configured for Java 5 and there is no Java 5 on my system (which there isn't!).
I have tried altering the build path so that it uses Java 6 libraries, but this generates a number of other warnings -- including warnings that the Java 6referenced in my manifest.mf file is invalid!
Then there are the "plugin.xml" warnings. Apparently, the build.properties file references a file called "plugin.xml" which is not created when the IDE creates the project. I have no idea whether or not this file is important enough to create, and I have no idea what should go into it.
Frankly, I hate warnings. Warnings tend to lead to future problems in what I produce. I like clean compiles and clean deployments. I would like to eliminate these warnings, before they start screwing me up down the road (like putting in Java6 classes that would break in a Java5 library).
Has anyone been able to eliminate these warnings reliably? Please advise.
For the JDK warning, you simply switch in the Manifest.MF to a target environment matching your preferred JDK ('JavaSE-1.6 ' in your case).
The warning regarding the missing plugin.xml will be gone as soon as you have run the grammar generator the first time, as it will produce such a file.
I am designing a class library designed to solve a wide scope of problems. One thing about this library is that it will be usable by several different languages and environments natively. For example, there will be a C++ version written entirely in C++, a .NET version written in C# and a Java version written in Java, without any dependencies on each other... as opposed to writing the core library in C++ and simply providing .NET and Java bindings to it.
The library in each of its different forms sets out to solve a different but sometimes very similar set of problems. For example, there might be many classes whose members will be functionally identical in each language, and there will also be many classes that will be present in only one or two language-versions of the library, but not the others. Take a class or struct representing a program's version number. .NET already has such as class (System.Version) so I would not include it in my .NET version but the C++ and Java libraries would provide one.
The problem I am facing is that for classes which will exist in most or all versions of the library, the documentation will remain relatively the same (obviously). The brief text for both the C++ and Java version for a Version struct would be something like "Represents a software version number in the form major.minor.build.revision"... as would the detailed class description, and all the members' documentation, etc. As you know, .NET, Java and C++ all have their own documentation syntax. Is there any way I can attempt to consolidate documentation in a language-neutral way (WITHOUT writing the documentation separately from the source code - e.g. manual documentation as opposed to generating it using doxygen/sandcastle/javadoc) or am I stuck copying and pasting the same text into the source files of each version?
I was having the same issues and decided there were just two options for me:
Using the same documentation generator in all languages. If you use doxygen (or ROBODoc, or whatever) for all of them, you would have just one doc syntax for all languages. This means that you have to break with language-specific conventions, though.
Write your own doc parser. Which is hard work, especially for a language with quite complex syntactic rules (as C++.)
We are currently using doxygen for such projects.
I've been having a look at making changes to the partial classes generated from a DBML file. I was reading into using the sqlmetal.exe tool but it appears that you can't do much customisation of what it actually spits out.
I'm wanting to make changes to the file for serialization purposes, I'd like to add the Data Member Attribute to specified properties in the generated partial classes.
Is this possible to do using the sqlmetal.exe tool or would I need to write my own tool for the file generation?
You could check out T4 templates or CodeSmith for file generation.
No it is not. You can accomplish this with Entity Framework.
http://blogs.msdn.com/jkowalski/archive/2008/05/12/transparent-lazy-loading-for-entity-framework-part-1.aspx
Code written by Jaroslaw Kowalski works much the same way that Linq to SQL does.
It has some issues, but you can do everything with it, because you have the source. I'm going to publish my version soon(support for stored procedures, improved databinding experience and many other useful features)
If you want the datacontract and datamember attributes to be added, simply change the "Serialization Mode" property in the L2S designer's datacontext properties from "None" to "Unidirectional". All entity classes will then be datacontracts, and their members will be datamembers...
The upcoming Beta version of Entity Developer will contain highly customizable T4-like templates for code generation.
Also we have added functionality to divide the generated code into separate files.
I am using Qt webkit Jambi API's to convert HTML to PDF.
My target is to create a jar for above conversion so that it could be used in a multithreading environment, but since QWebPage and QWebframe (QT webkit) are GUI classes, therefore the jar classes cannot be initialized from child threads.
So i am stuck as i don't know how to work around this problem.
Also i am a novice in QT , can anyone provide good reference about QT application's lifecycle, event loops and related stuff.
thanks in advance.
Ashish
Well, actually, I just use Firefox to do "Print to File" and select PDF as the filetype. But that's for manual work - although I suppose you could script Firefox.
I think in a Linux environment - and I'm assuming Linux/Unix because you mentioned Qt - that you could probably string together a couple of nx command-line apps. Possibly enscript has something that would help. If not, I'm pretty sure I've seen other solutions, just can't recall them off the top of my head. If you can transform the HTML to Postscript, getting a PDF out of it is trivial.
If HTML4 and (parts of) CSS1 suffice for your needs, then you can use QTextDocument together with QPrinter in a separate thread.
"Programming with Qt, Second Edition", O'Reilly, is excellent but only covers Qt3. A lot of the basic still apply to Qt 4.5.
"C++ GUI Programming with Qt 4 (2nd Edition)", ISBN 0132354160, is not bad.
The Qt docs contain examples and tutorials too.
It's not clear to me why you can't initialize a jar with GUI classes from within child threads. Is this an artificial limitation set on Jambi by the trolls?
I took note of this example on Rendering a webpage with Qt and Webkit to a QPixmap, which theoretically doesn't need to show anything on the screen. QWebPage and QWebFrame both inherit QObject. Using the sample code from the above link, it should be possible to get a webpage's rendered contents without a GUI.
My primary task was to get html to pdf conversion for printing the pdf.
I tried to get QT jambi (QT webkit C++ api also) to work in multithreaded environment but could not.
My final solution was as follows:
I used ‘wkhtmltopdf’ native binary from here,
wrote a java wrapper capturing the standard input and output streams.
Initialized the ‘wkhtmltopdf’ binary for each java thread that required the html to pdf conversion.
Also i never worked on erjiang's advice because by then I had moved out of the task and never got time to work on his advice.