Asp. NETCORE uses dynamic to simplify database access

Today I wrote a database help class , The code is as follows . 

public static class DbEx{ public static dynamic ReadToObject(this IDataReader reader) { var obj = new DbObject(); for (int i = 0; i < reader.FieldCount; i++) { obj[reader.GetName(i)] = new DbField() { DbData = reader[i] }; } return obj; } public class DbObject : DynamicObject { // Realize one by yourself , no need ExpandoObject, To support case insensitive reading public override bool TryGetMember(GetMemberBinder binder, out object result) { result = this[binder.Name]; return true; } Dictionary<string, object> _values = new Dictionary<string, object>(StringComparer.CurrentCultureIgnoreCase); public object this[string index] { get => _values[index]; set => _values[index] = value; } } public class DbField { public object DbData { get; set; } public T Value<T>() { return (T)Convert.ChangeType(DbData, typeof(T)); } public static implicit operator string(DbField data) => data.Value<string>(); public static implicit operator int(DbField data) => data.Value<int>(); public static implicit operator DateTime(DbField data) => data.Value<DateTime>(); public static implicit operator double(DbField data) => data.Value<double>(); public static implicit operator bool(DbField data) => data.Value<bool>(); }}

In a nutshell , You can put the following code

GpsData parse(IDataReader reader){ return new GpsData() { IsValid = (bool)reader["IsValid"], Location = new Location () { Lon = (double)reader["Lon"], Lat = (double)reader["Lat"], }, Angle = (double)reader["Angle"], Speed = (double)reader["Speed"]), UpdateTime = (double)reader["Speed"]), };}

To the following form

GpsData parse(IDataReader reader){ var obj = reader.ReadToObject(); var state = new GpsData() { IsValid = obj.IsValid, Location = new Location() { Lon = obj.Lon, Lat = obj.Lat, }, Angle = obj.Angle, Speed = obj.Speed, UpdateTime = obj.UpdateTime, }; return state;}

This is about Asp.net core utilize dynamic This is the end of the article on simplifying database access . I hope it will be helpful for your study , I also hope you can support the software development network .