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這篇文章主要介紹“Asp.net core怎么利用dynamic簡化數據庫訪問”,在日常操作中,相信很多人在Asp.net core怎么利用dynamic簡化數據庫訪問問題上存在疑惑,小編查閱了各式資料,整理出簡單好用的操作方法,希望對大家解答”Asp.net core怎么利用dynamic簡化數據庫訪問”的疑惑有所幫助!接下來,請跟著小編一起來學習吧!
數據庫的幫助類,代碼如下
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 { //自己實現一個,不用ExpandoObject, 以支持無視大小寫讀取 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>(); } }
簡單的來講,可以把如下代碼
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"]), }; }
轉換為如下形式
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; }
到此,關于“Asp.net core怎么利用dynamic簡化數據庫訪問”的學習就結束了,希望能夠解決大家的疑惑。理論與實踐的搭配能更好的幫助大家學習,快去試試吧!若想繼續學習更多相關知識,請繼續關注億速云網站,小編會繼續努力為大家帶來更多實用的文章!
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