/// <summary>
/// 安全地读入指定字段的名称
/// </summary>
/// <param name="bsonReader">Bson读取器</param>
/// <param name="expected">字段名</param>
/// <param name="read">字段名缓存</param>
/// <returns>是否可以继续读入</returns>
private static bool ReadName(this IBsonReader bsonReader, string expected, ref string read)
{
if (bsonReader.IsEndOfDocument())
{
return(false);
}
read ??= bsonReader.ReadName();
if (read != expected)
{
return(false);
}
read = null;
return(true);
}