C# 在C中设置运行时的实体框架连接字符串#
我需要在运行时设置实体框架连接字符串。现在,我有以下几点:C# 在C中设置运行时的实体框架连接字符串#,c#,entity-framework,C#,Entity Framework,我需要在运行时设置实体框架连接字符串。现在,我有以下几点: string connectionString = "metadata=res://*/DataModels.CustomerDataModel.csdl|res://*/DataModels.CustomerDataModel.ssdl|res://*/DataModels.CustomerDataModel.msl;provider=System.Data.SqlClient;provider connection string=&
string connectionString = "metadata=res://*/DataModels.CustomerDataModel.csdl|res://*/DataModels.CustomerDataModel.ssdl|res://*/DataModels.CustomerDataModel.msl;provider=System.Data.SqlClient;provider connection string="data source=tcp:{serverName},{portNumber};initial catalog={databaseName};user id={username};multipleactiveresultsets=True;application name=EntityFramework"";
using (CustomerEntities entities = new CustomerEntities(connectionString))
{
CustomerEntity entity = new CustomerEntity();
// do more
entities.CustomerEntities.Add(entity);
entities.SaveChanges();
}
当我执行上面的代码时(替换了{parameter}值),我得到以下错误:
不支持关键字:“数据源”
我做错了什么?改变这个
string connectionString = "metadata=res://*/DataModels.CustomerDataModel.csdl|res://*/DataModels.CustomerDataModel.ssdl|res://*/DataModels.CustomerDataModel.msl;provider=System.Data.SqlClient;provider connection string="data source=tcp:{serverName},{portNumber};initial catalog={databaseName};user id={username};multipleactiveresultsets=True;application name=EntityFramework"";
对此(请注意我是如何将“字符”转义为“”)
我知道这是10个月前提出的,但我找到了一种更简单的方法来指定connectionString: 如果您的配置文件将其设置为:
<connectionStrings>
<add name="CustomerDataModel" connectionString="metadata=res://*/EntityFramework.CustomerDataModel.csdl|res://*/EntityFramework.CustomerDataModel.ssdl|res://*/EntityFramework.CustomerDataModel.msl;provider=System.Data.SqlClient;provider connection string="data source=.\CustomerDataModel;initial catalog=CustomerDB;integrated security=True;multipleactiveresultsets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
无需担心quotes.Lot cleaner。更易于使用和根据需要更改参数。在web.config中设置多个连接字符串,并执行以下操作:
public partial class MyDatabaseEntities
{
public MyDatabaseEntities(string connection)
: base(connection)
{
}
}
然后,无论在何处创建实体实例,都要在参数中传递连接字符串名称:
MyDatabaseEntities entities = new MyDatabaseEntities("CONNECTION_STRING_NAME");
我希望这会有所帮助
谢谢
public partial class MyDatabaseEntities
{
public MyDatabaseEntities(string connection)
: base(connection)
{
}
}
MyDatabaseEntities entities = new MyDatabaseEntities("CONNECTION_STRING_NAME");