2. Efficient way to troubleshoot issues, which are not
reproduced on dev environment
Page is opened in context of living site, e.g.
http://example.com/_layouts/test.aspx
Do not require updates of wsp packages
Do not require installations of dlls into the GAC
Can be easily removed from production after
troubleshooting without leaving security holes
C# 2.0 is available by default for server scripts
3. Example: trace info about thread principal and
currently logged Sharepoint user
4. Example: trace info about thread principal and
currently logged Sharepoint user
5. Enable features of C# 3.0 in _layouts pages via
web.config:
All features of C# 3.0 become available (e.g. lambdas,
query expressions, etc.): see Overview of C# 3.0
6. Sharepoint 2013 preview:
Web sites are created with .Net 4.0 app pools
Default compiler is set to version 4.0
It is possible to use features of C# 4 (e.g. dynamic types) in
embedded server scripts without additional configurations
7. Use when can’t solve problem with standard tools
Requires preliminary investigation of Sharepoint code:
JetBrains dotPeek
Telerik JustCompile
Reflector
Where to search Sharepoint dlls:
GAC
14/ISAPI
inetpub...mywebapp_app_bin
8. Real life example:
Create instance of SPSite in
SPSecurity.RunWithElevatedPrivileges() method
Open SPWeb
Code is executed under SHAREPOINTSystem account (app pool
identity)
Call standard API which in turns uses SPContext.Current.Site or
SPContext.Current.Web
Result: access denied page
13. Can be used for generating and executing a method at run time,
without having to generate a dynamic assembly and a dynamic type
to contain the method
The executable code created by the just-in-time (JIT) compiler is
reclaimed when the DynamicMethod object is reclaimed
If the dynamic method is associated with specific type, it has access to
all members of the type, regardless of access level
Dynamic methods and their parameters do not have to be named
Allows to avoid some limitations of C#: e.g. although dynamic
methods are static methods the relaxed rules for delegate binding
allow a dynamic method to be bound to an object, so that it acts like an
instance method when called using that delegate instance
14. Example: dynamic method for calculating factorial
15. How it can be used in Sharepoint?
Example: use Telerik RadEditor in all sub sites in web application
without feature activations
RadEditorFeature – overrides rendering template for RichTextField with
Telerik control
RadEditorFeatureIE – “flag” feature, depends on RadEditorFeature
Technically it is enough to activate RadEditorFeature once
For new sites:
Activate features manually
Use feature stappling for OTB site definitions
Modify onet.xml file for custom site definitions
16. Where problem is coming from? RadHtmlListField class:
17. Solution:
Define new class inheritor of RadHtmlListField
Define OnLoad() by the same way as in RadHtmlListField using reflection
Always return true from ShowEditorOnPage() method
Inheritance chain:
AllBrowsersHtmlListField –> RadHtmlListField –> MOSSRadEditor
The problem: how to call MOSSRadEditor.OnLoad() from
AllBrowsersHtmlListField.OnLoad() without caling RadHtmlListField
.OnLoad()?
I.e. we need to skip one tier in the inheritance chain and call virtual method OnLoad(),
but not from base class, but from base of base class
Answer: no how in standard C#
Can dynamic method help here? Yes
18. Example: create dynamic method for skipping one tier in virtual members calls
19. Camlex – open source project which simplifies creating of CAML queries for
SharePoint by using expression trees
Uses expression trees and lambda expressions for generating CAML
Simplifies creation of dynamic CAML queries when conditions are calculated
in runtime
Doesn’t require knowledge of CAML from developers
Supports native .Net types and Sharepoint-specific types
http://camlex.codeplex.com/
21. Camlex 3.0 Reverse Engineering – creates expression trees based on strings
Reverse Engineering translator:
22. Camlex Re + ExpressionToCode = Camlex Online: http://camlex-online.org/
Simplifies usage of Camlex for developers who didn’t have experience with it
yet
Quick refactoring of existing hard-coded CAML queries to Camlex
Fully reversible CAML query schema opens many interesting applications in
future
Example of combining of several non-trivial OSS projects
23. Add conditions to existing string queries using lambda expressions:
25. Built-in to OS, doesn’t need VS for writing and running C# programs
May be useful:
if you already have a code which want to reuse
have existing C# code which is hard to move to PowerShell
for developers who know C#, but only started work with PowerShell
if you want to run quick test, but don’t want to run VS and compile dll
C# 3.0 can be used: -Language CSharpVersion3
Can specify existing assemblies or source code files
26. Example: enumerate sub-sites using C# code in PowerShell
27. http://sadomovalex.blogspot.com/
Use C# 3.0 features in application layout pages in Sharepoint:
http://sadomovalex.blogspot.fi/2010/12/use-c-30-features-in-
application-layout.html
Use Telerik Rad Editor Lite without features activation:
http://sadomovalex.blogspot.fi/2011/12/use-telerik-rad-editor-lite-
without.html
Generating Dynamic Methods with Expression Trees in Visual Studio
2010:
http://blogs.msdn.com/b/csharpfaq/archive/2009/09/14/generating-
dynamic-methods-with-expression-trees-in-visual-studio-2010.aspx
Camlex project site: http://camlex.codeplex.com/
Camlex online: http://camlex-online.org/
ExpressionToCode: http://code.google.com/p/expressiontocode/
Materials from followings sites are used for presentation:
http://newswallpapers1.blogspot.com, http://arts-wallpapers.com,
http://www.fanpop.com, http://wallpaperswide.com,
http://starwars.wikia.com
