How Can I Group Objects by a Common Property Using LINQ?

Group objects by common properties using LINQ

This example demonstrates how to group a list of objects based on shared properties. Using LINQ, we can achieve this using the GroupBy and Select methods.

The GroupBy method creates a collection of key-value pairs, where the keys represent unique values ​​for the specified attributes. In this example, we group by the GroupID attribute. The resulting output will be a collection of key-value pairs, where the key is the GroupID and the value is an enumeration of all User objects that share the same GroupID.

To convert these key-value pairs into a list of grouped lists, we apply the Select method. In the Select clause, we use the ToList method to convert the value part of each key-value pair (which is an enumeration of User objects) into a list.

Putting everything together, here is the LINQ query to achieve the desired grouping:

<code>var groupedCustomerList = userList
    .GroupBy(u => u.GroupID)
    .Select(grp => grp.ToList())
    .ToList();</code>

The final groupedCustomerList will be a list of lists, where each inner list contains User objects grouped by their GroupID. This structure allows you to easily access and manipulate grouped data as needed.

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