Property this

Gets or sets a value by position.

public override BsonValue this[int index] { get; set; }

Gets the value of an element or a default value if the element is not found.

[Obsolete("Use GetValue(string name, BsonValue defaultValue) instead.")]
public virtual BsonValue this[string name, BsonValue defaultValue] { get; }

name string: The name of the element.
defaultValue BsonValue: The default value to return if the element is not found.

BsonValue: Teh value of the element or a default value if the element is not found.

Gets or sets a value by name.

public override BsonValue this[string name] { get; set; }