How Can I Dynamically Order Data in LINQ Using a Parameter?

LINQ dynamic sorting: understanding the dynamic parameters of the OrderBy method

The OrderBy method in LINQ queries allows efficient sorting of data. But what if you want to dynamically specify sorting parameters based on parameters? This article will guide you through this.

Current implementation

Suppose you have a list of Student objects and want to sort them by their Address property:

<code class="language-csharp">List<Student> existingStudents = new List<Student> { new Student {...}, new Student {...} };

List<Student> orderbyAddress = existingStudents.OrderBy(c => c.Address).ToList();</code>

However, this hardcodes the address ordering.

Dynamic sorting

To dynamically specify sorting parameters, you can leverage reflection to construct an expression tree:

<code class="language-csharp">public static IQueryable<T> OrderBy<T>(this IQueryable<T> source, string orderByProperty, bool desc)
{
    // ... (此处应提供答案中的代码片段)
}</code>

How to use

You can now use the OrderBy extension method with dynamic parameters:

<code class="language-csharp">string param = "City";
List<Student> orderbyCity = existingStudents.OrderBy("City", true).ToList(); // 降序排序</code>

This approach provides the flexibility to specify sorting parameters at runtime, allowing for customizable and dynamic sorting in LINQ queries.

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