在开发中可能会遇到这几种情况：
1、EF或LINQ查询出来的匿名对象在其它地方调用不方便，又懒的手动建实体类
2、通过datatable反射实体需要先建一个类 ，头痛
3、通过SQL语句返回的实体也需要先建一个类 ，头痛
4、如果通过代码生成器要写模版，需要安装或者不想生成一堆不用的类
为了解决上面的不便之处，我封装了一个实体生成类，可以扔到程序里面任意调用
封装类：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using System.Data.SqlClient; using System.Text.RegularExpressions; namespace SyntacticSugar { /// <summary> /// ** 描述：实体生成类 /// ** 创始时间：2015-4-17 /// ** 修改时间：- /// ** 作者：sunkaixuan /// ** qq：610262374 欢迎交流,共同提高 ,命名语法等写的不好的地方欢迎大家的给出宝贵建议 /// </summary> public class ClassGenerating { /// <summary> /// 根据匿名类获取实体类的字符串 /// </summary> /// <param>匿名对象</param> /// <param>生成的类名</param> /// <returns></returns> public static string DynamicToClass(object entity, string className) { StringBuilder reval = new StringBuilder(); StringBuilder propertiesValue = new StringBuilder(); var propertiesObj = entity.GetType().GetProperties(); string replaceGuid = Guid.NewGuid().ToString(); string nullable = string.Empty; foreach (var r in propertiesObj) { var type = r.PropertyType; if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>)) { type = type.GetGenericArguments()[0]; nullable = "?"; } if (!type.Namespace.Contains("System.Collections.Generic")) { propertiesValue.AppendLine(); string typeName = ChangeType(type); propertiesValue.AppendFormat("public {0}{3} {1} {2}", typeName, r.Name, "{get;set;}", nullable); propertiesValue.AppendLine(); } } reval.AppendFormat(@" public class {0}{{ {1} }} ", className, propertiesValue); return reval.ToString(); } /// <summary> /// 根据DataTable获取实体类的字符串 /// </summary> /// <param></param> /// <param></param> /// <returns></returns> public static string DataTableToClass(DataTable dt, string className) { StringBuilder reval = new StringBuilder(); StringBuilder propertiesValue = new StringBuilder(); string replaceGuid = Guid.NewGuid().ToString(); foreach (DataColumn r in dt.Columns) { propertiesValue.AppendLine(); string typeName = ChangeType(r.DataType); propertiesValue.AppendFormat("public {0} {1} {2}", typeName, r.ColumnName, "{get;set;}"); propertiesValue.AppendLine(); } reval.AppendFormat(@" public class {0}{{ {1} }} ", className, propertiesValue); return reval.ToString(); } /// <summary> /// 根据SQL语句获取实体类的字符串 /// </summary> /// <param>SQL语句</param> /// <param>生成的类名</param> /// <param>服务名</param> /// <param>数据库名称</param> /// <param>账号</param> /// <param>密码</param> /// <returns></returns> public static string SqlToClass(string sql, string className, string server, string database, string uid, string pwd) { using (SqlConnection conn = new SqlConnection(string.Format("server={0};uid={2};pwd={3};database={1}", server, database, uid, pwd))) { SqlCommand command = new SqlCommand(); command.Connection = conn; command.CommandText = sql; DataTable dt = new DataTable(); SqlDataAdapter sad = new SqlDataAdapter(command); sad.Fill(dt); var reval = DataTableToClass(dt, className); return reval; } } /// <summary> /// 根据SQL语句获取实体类的字符串 /// </summary> /// <param>SQL语句</param> /// <param>生成的类名</param> /// <param>webconfig的connectionStrings name</param> /// <returns></returns> public static string SqlToClass(string sql, string className, string connName) { string connstr = System.Configuration.ConfigurationManager.ConnectionStrings[connName].ToString(); if (connstr.Contains("metadata"))//ef connstr = Regex.Match(connstr, @"connection string\=""(.+)""").Groups[1].Value; using (SqlConnection conn = new SqlConnection(connstr)) { SqlCommand command = new SqlCommand(); command.Connection = conn; command.CommandText = sql; DataTable dt = new DataTable(); SqlDataAdapter sad = new SqlDataAdapter(command); sad.Fill(dt); var reval = DataTableToClass(dt, className); return reval; } } /// <summary> /// 匹配类型 /// </summary> /// <param></param> /// <returns></returns> private static string ChangeType(Type type) { string typeName = type.Name; switch (typeName) { case "Int32": typeName = "int"; break; case "String": typeName = "string"; break; } return typeName; } } }
调用如下：