LINQ Grouping dynamically

by

If you’re not working with a database you can use Reflection:

private static object GetPropertyValue(object obj, string propertyName)
{
    return obj.GetType().GetProperty(propertyName).GetValue(obj, null);
}

Used as:

var grouped = enumeration.GroupBy(x => GetPropertyValue(x, columnName));

This is a pretty raw solution, a better way should be to use Dynamic LINQ:

var grouped = enumeration.GroupBy(columnName, selector);

EDIT Dynamic LINQ maybe needs some explanations. It’s not a technology, a library or a brand new framework. It’s just a convenient name for a couple (2000 LOC) of helpers methods that let you write such queries. Just download their source (if you don’t have VS samples installed) and use them in your code.

More Related Contents:

  1. Group By Multiple Columns
  2. C# custom add in a List
  3. LINQ query on a DataTable
  4. Distinct not working with LINQ to Objects
  5. When to use Cast() and Oftype() in Linq
  6. How to get index using LINQ? [duplicate]
  7. How do I concatenate two arrays in C#?
  8. Split a collection into `n` parts with LINQ? [duplicate]
  9. Why is .Contains slow? Most efficient way to get multiple entities by primary key?
  10. Query an XDocument for elements by name at any depth
  11. What is the point of Lookup?
  12. Am I misunderstanding LINQ to SQL .AsEnumerable()?
  13. Conversion from List to array T[]
  14. Enumerating through an object’s properties (string) in C#
  15. Is the Linq Count() faster or slower than List.Count or Array.Length?
  16. Intersect LINQ query
  17. LINQ – Query syntax vs method chains & lambda [closed]
  18. Resolving extension methods/LINQ ambiguity
  19. linq distinct or group by multiple properties
  20. Max or Default?
  21. What does this C# code with an “arrow” (=>, an equal sign and greater than sign) mean and how is it called?
  22. Using Linq Except not Working as I Thought
  23. What is the purpose of AsQueryable()?
  24. How do I do a left outer join with Dynamic Linq?
  25. LINQ query to return a Dictionary
  26. LINQ performance FAQ
  27. A dictionary where value is an anonymous type in C#
  28. Should the order of LINQ query clauses affect Entity Framework performance?
  29. Map two lists into a dictionary in C#
  30. Can I use Linq’s Except() with a lambda expression comparer?

Leave a Comment