Asp.netcore利用dynamic简化数据库访问

今天写了一个数据库的帮助类，代码如下。 

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 { //自己实现一个，不用ExpandoObject， 以支持无视大小写读取 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>(); }}

简单的来讲，可以把如下代码

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"]), };}

转换为如下形式

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;}

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