Question 1

How to use GeoJSON.Net with ASP.NET Core 3.1?

Accepted Answer

You must add the Microsoft.AspNetCore.Mvc.NewtonsoftJson package and configure services with AddNewtonsoftJson(), as the README notes it doesn't work with the default System.Text.Json serializer.

Question 2

GeoJSON.Net vs GeoJSON.Text: which one should I choose?

Accepted Answer

Use GeoJSON.Net if you're committed to Newtonsoft.Json for serialization. Opt for GeoJSON.Text, the fork, if you need System.Text.Json support in modern .NET applications.

Question 3

How do I serialize a complex GeoJSON feature collection in C#?

Accepted Answer

Create a FeatureCollection object with your features, then use JsonConvert.SerializeObject. Check the library's tests for examples on handling nested geometries and properties.

Question 4

What are the performance impacts of using Newtonsoft.Json with GeoJSON.Net?

Accepted Answer

Newtonsoft.Json is generally slower and less memory-efficient than System.Text.Json, so you might see performance trade-offs in high-throughput APIs or large datasets.

Question 5

Can I perform spatial calculations like distance with GeoJSON.Net?

Accepted Answer

No, it only handles serialization and deserialization. For spatial operations, you'll need to integrate with other libraries such as NetTopologySuite or write custom logic.

Question 6

How to handle custom properties in GeoJSON features?

Accepted Answer

Use the Feature.Properties dictionary to store key-value pairs, which are serialized as JSON objects. Ensure your JSON matches the expected structure to avoid deserialization errors.

GeoJSON.NET

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