实体'不包​​含一个构造函数的参数1 [英] Entities' does not contain a constructor that takes 1 arguments

问题描述

public class Connection
{
    public static string GetConecction()
    {
        return ConfigurationManager.ConnectionStrings["DCAssetEntities"].ConnectionString;
    }
}

我有一个连接级配置我的实体框架模型实体网络

I have one "connection" class to configure my web with Entity framework model Entities

public class ConnectionDAL
{
    private DCAssetEntities db;

    public ConnectionDAL()
    {
        db = new DCAssetEntities(Connection.GetConecction());
    }
}

然后我intialize我在ConnectionDAL类的构造数据库,,它是在2010年Visusal Studio，但在visusal Studio 2012中工作良好的显示错误DC_Asset_Maintenance.DAL.DCAssetEntities'不包含一个构造函数的参数1

then I intialize my database in "ConnectionDAL" class constructor,, It's working good in Visusal Studio 2010 but in visusal Studio 2012 showing Error "DC_Asset_Maintenance.DAL.DCAssetEntities' does not contain a constructor that takes 1 arguments "

推荐答案

您的类 DCAssetEntities 需要有下面的定义构造函数。

Your class DCAssetEntities needs to have a constructor with the following definition.

public DCAssetEntities(string connectionString){}

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