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這篇文章主要介紹“Asp.net core怎么利用dynamic簡(jiǎn)化數(shù)據(jù)庫(kù)訪問(wèn)”,在日常操作中,相信很多人在Asp.net core怎么利用dynamic簡(jiǎn)化數(shù)據(jù)庫(kù)訪問(wèn)問(wèn)題上存在疑惑,小編查閱了各式資料,整理出簡(jiǎn)單好用的操作方法,希望對(duì)大家解答”Asp.net core怎么利用dynamic簡(jiǎn)化數(shù)據(jù)庫(kù)訪問(wèn)”的疑惑有所幫助!接下來(lái),請(qǐng)跟著小編一起來(lái)學(xué)習(xí)吧!
數(shù)據(jù)庫(kù)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(shí)現(xiàn)一個(gè),不用ExpandoObject, 以支持無(wú)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(jiǎn)單的來(lái)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(zhuǎn)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(guān)于“Asp.net core怎么利用dynamic簡(jiǎn)化數(shù)據(jù)庫(kù)訪問(wèn)”的學(xué)習(xí)就結(jié)束了,希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí),快去試試吧!若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí),請(qǐng)繼續(xù)關(guān)注億速云網(wǎng)站,小編會(huì)繼續(xù)努力為大家?guī)?lái)更多實(shí)用的文章!
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