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What do you need to know about LINQ method syntax?
In the previous section, you have learned about LINQ Query Syntax. Here, you will learn about Method syntax. Method syntax (also known as fluent syntax) uses extension methods included in the Enumerable or Queryable static class, similar to how you would call the extension method of any class.
Which is better LINQ or fluent in.net?
LINQ is one of the greatest improvements to .NET since generics and it saves me tons of time, and lines of code. However, the fluent syntax seems to come much more natural to me than the query expression syntax.
How is the body of a method in fluent?
The method body is simple; if the predicate evaluates to true we invoke AppendLine on the supplied StringBuilder and return the instance via the fluent interface otherwise we just return the supplied StringBuilder. Now we can refactor our conditional append to use AppendLineWhen.
What is a fluent interface in.net framework?
A fluent interface is a specialized, self-referencing form of method chaining where the context is maintained through the chain. The type I want to look at is one of the oldest classes in the .NET Framework – the StringBuilder. I’ve written about extending the StringBuilder before.
How to create a list from a list in LINQ?
Linq will map the modified statement, and execute it from your IQueryable. For example: Technically, the AsQueryable () is a bit redundant. Sometimes I use it to make it a point, others say it is absolutely required. None the less, the list object itself is IQueryable of ClassB.
How to populate object collections from multiple sources ( LINQ )?
Copy the names.csv and scores.csv files into your project folder, as described in How to join content from dissimilar files (LINQ) (C#). The following example shows how to use a named type Student to store merged data from two in-memory collections of strings that simulate spreadsheet data in .csv format.
How to add custom methods for LINQ queries in C #?
If the type doesn’t have its own method overload, you have to pass a delegate parameter. In C#, you can use a lambda expression for this purpose. Also, in Visual Basic only, if you use the Aggregate or Group By clause instead of the method call, you can pass any value or expression that is in the scope this clause.