What is OrderBy in C#?
In a query expression, the orderby clause causes the returned sequence or subsequence (group) to be sorted in either ascending or descending order. Multiple keys can be specified in order to perform one or more secondary sort operations. The sorting is performed by the default comparer for the type of the element.
What is OrderBy in LINQ?
LINQ OrderBy operator comes first in LINQ Sorting Operators. OrderBy operator sort the sequence (collection) based on particular property in ascending order. We can use OrderBy operator both in Query Syntax and Method Syntax.
Is LINQ OrderBy stable?
This method performs a stable sort; that is, if the keys of two elements are equal, the order of the elements is preserved.
Are Ienumerables ordered?
IEnumerable/IEnumerable makes no guarantees about ordering, but the implementations that use IEnumerable/IEnumerable may or may not guarantee ordering.
What is the use of ThenBy in Linq?
LINQ ThenBy Operator is used when we want to sort the elements in a collection by using multiple properties in ascending order. This operator must use after OrderBy or OrderByDescending operator.
Is order by stable?
The ORDER BY clause contains a column or combination of columns that are guaranteed to be unique. The simplest way to understand that a sort is not stable is to go back to the definition of a table. Tables are inherently unordered in SQL. So, there is no ordering to fall back on for “stability”.
How do you fix multiple enumeration of IEnumerable?
This kind of problem can be easily fixed — force the enumeration at the point of variable initialization by converting the sequence to an array or a list, for example: List names = GetNames().
Does IEnumerable preserve order C#?
When you enumerate over IEnumerable you should not care about order. You work with the interface, and its implementation should care about order.
What does orderby mean in SQL?
In query expression syntax, an orderby (Visual C#) or Order By (Visual Basic) clause translates to an invocation of OrderBy. See also OrderByDescending (IEnumerable , Func )
What is the difference between unstable sort and orderby?
In contrast, an unstable sort does not preserve the order of elements that have the same key. In query expression syntax, an orderby(Visual C#) or Order By(Visual Basic) clause translates to an invocation of OrderBy. See also OrderByDescending (IEnumerable , Func )
Does LINQ orderby throw exceptions at compile time?
Any such sort would throw exceptions at run-time, rather than compile time (like D2VIANT’s answer). If you’re dealing with Linq to Sql and the orderby is an expression tree it will be converted into SQL for execution anyway.
Is it possible to use a string for ordering in dynamic LINQ?
Show activity on this post. I found an example in the VS2008 Examples for Dynamic LINQ that allows you to use a SQL-like string (e.g. OrderBy (“Name, Age DESC”)) for ordering. Unfortunately, the method included only works on IQueryable .
https://www.youtube.com/watch?v=bv9CqGjnSI0