Linq (from the inside)

Editor's Notes

• #4: Not Link cosplay! Not that there’s anything wrong with that…
• #5: The “other” Microsoft “link”
• #8: Language-Integrated QueryQuery is first class citizen in languageQueries are consistent across data sourcesOne query language to rule them all
• #9: Don’t want to get too far in without recognizing the true brains behind this presentation.
• #10: Monster on StackOverflowWrote “C# In Depth” (excellent read… I need to pick up the second edition)Wrote the Edulinq blog posts (and project that I’m based on today)
• #13: http://msdn.microsoft.com/en-us/library/bb882642.aspxSo back to Linq…Query Expression Syntax vs. Extension MethodsNote that given the providers, “customers” could be XML, a database, a web service…But then they split it into two different syntaxes? Syntacies?“real” linq (integrated query) only supports a subset of what the full extension methods support.
• #14: These language features are used to implement Linq either explicitly or “from the inside”Query syntax inlinevar keywordCustomer cust = new Customer { Name = "Mike", Phone = "555-1212" };An anonymous type is constructed by the compiler and the type name is only available to the compiler. Anonymous types provide a convenient way to group a set of properties temporarily in a query result without having to define a separate named type. An extension method is a static method that can be associated with a type, so that it can be called as if it were an instance method on the type. This feature enables you to, in effect, "add" new methods to existing types without actually modifying them.A lambda expression is an inline function that uses the => operator to separate input parameters from the function body and can be converted at compile time to a delegate or an expression tree.the compiler will create a private, anonymous backing field that is not accessible except through the property getter and setter.
• #15: Linq operators are defined as extension methods on IEnumerable<T>So it’s important that we understand the anatomy of extension methods.Extension methods are defined as static methods but are called by using instance method syntax. Their first parameter specifies which type the method operates on, and the parameter is preceded by the this modifier. Extension methods are only in scope when you explicitly import the namespace into your source code with a using directive.
• #17: Going to pull back the curtain
• #18: Unfortunately it may feel like this for a little bit…House in Poland
• #21: Going to pull back the curtain
• #22: These language features are used to implement Linq either explicitly or “from the inside”Query syntax inlinevar keywordCustomer cust = new Customer { Name = "Mike", Phone = "555-1212" };An anonymous type is constructed by the compiler and the type name is only available to the compiler. Anonymous types provide a convenient way to group a set of properties temporarily in a query result without having to define a separate named type. An extension method is a static method that can be associated with a type, so that it can be called as if it were an instance method on the type. This feature enables you to, in effect, "add" new methods to existing types without actually modifying them.A lambda expression is an inline function that uses the => operator to separate input parameters from the function body and can be converted at compile time to a delegate or an expression tree.the compiler will create a private, anonymous backing field that is not accessible except through the property getter and setter.