转载: .net 根据匿名类生成实体类，根据datatable生成实体类,根据sql生成实体类
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 name="entity">匿名对象</param>
/// <param name="className">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 name="sql"></param>
/// <param name="className"></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 name="sql">SQL语句</param>
/// <param name="className">生成的类名</param>
/// <param name="server">服务名</param>
/// <param name="database">数据库名称</param>
/// <param name="uid">账号</param>
/// <param name="pwd">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 name="sql">SQL语句</param>
/// <param name="className">生成的类名</param>
/// <param name="connName">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 name="type"></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：
//通过匿名对象生成实体类
var dynamicObj = new { id = 1, name = "小名", entity = new enityt1() }; //注意：只能是单个实体不能传入 List<T> ,集合需要 List[0]
string classCode = ClassGenerating.DynamicToClass(dynamicObj, "classDynamic");
//通过datatable生成实体类
DataTable dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name");
classCode = ClassGenerating.DataTableToClass(dt, "classTatabale");
//通过sql语句生成实体类
classCode = ClassGenerating.SqlToClass("select * from note", "Note", "127.0.0.1", "MyWork", "sa", "sasa");
classCode = ClassGenerating.SqlToClass("select * from dbo.AccessoriesDetail", "AccessoriesDetail", "NFDEntities");//通过 config connstring名称
然后在调试状态把你需要的结果CTRL+C 然后去新建一个类CTRL+V
时间： 2024-11-05 19:03:15