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Showing content from https://www.mongodb.com/docs/realm-sdks/dotnet/latest/reference/Realms.QueryMethods.html below:

Class QueryMethods | Realm

Provides methods that get translated into native Realm queries when using LINQ.

public static class QueryMethods

Returns a value indicating whether a specified substring occurs within this string.

public static bool Contains(string? str, string value, StringComparison comparisonType)

The original string.

The string to seek.

One of the enumeration values that determines how this string and value are compared.

true if the value parameter occurs within this string, or if value is the empty string (""); otherwise, false.

Performs a 'simple term' Full-Text search on a string property.

public static bool FullTextSearch(string? str, string terms)

The string to compare against the terms.

The terms to look for in str.

true if the string matches the terms; false otherwise.

var matches = realm.All<Book>().Where(b => b.Summary.FullTextSearch("fantasy novel"));

Checks whether geoShape contains the point represented by an embedded object.

public static bool GeoWithin(IEmbeddedObject? point, GeoShapeBase geoShape)

An embedded object that has the shape of a GeoJson point. It must have at least two fields - IList<double> coordinates and string type. The shape of the object will be verified at runtime.

One of GeoBox, GeoCircle, or GeoPolygon representing the shape that point will be checked against.

true if point is contained in geoShape; false otherwise.

An example embedded object that can be used in geospatial queries is:

public partial class MyGeoPoint : IEmbeddedObject
{
    [MapTo("coordinates")]
    private IList<double> Coordinates { get; } = null!;

    [MapTo("type")]
    private string Type { get; set; } = "Point";

    public double Latitude => Coordinates.Count > 1 ? Coordinates[1] : throw new Exception($"Invalid coordinate array. Expected at least 2 elements, but got: {Coordinates.Count}");

    public double Longitude => Coordinates.Count > 1 ? Coordinates[0] : throw new Exception($"Invalid coordinate array. Expected at least 2 elements, but got: {Coordinates.Count}");

    public MyGeoPoint(double latitude, double longitude)
    {
        Coordinates.Add(longitude);
        Coordinates.Add(latitude);
    }
}

Note that if you're using Sync, the name of the embedded object type must match exactly the title of the embedded object defined in the GeoJson Schema on the server.

Performs a 'like' comparison between the specified string and pattern.

public static bool Like(string? str, string pattern, bool caseSensitive = true)

The string to compare against the pattern.

The pattern to compare against.

If set to true performs a case sensitive comparison.

true if the string matches the pattern, false otherwise.

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