我需要在运行时设置我的Entity Framework连接字符串。现在,我有以下内容:
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),我收到以下错误:
不支持关键字:'数据源'。
我做错了什么?
答案 0 :(得分:21)
改变这一点。
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“)”
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""";
答案 1 :(得分:8)
我知道这是在10个月前提出的,但我找到了一种更简单的方法来指定connectionString:
如果您的配置文件包含:
<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" />
您可以将其指定为 -
public const string ConnectionString = @"name=CustomerDataModel";
..
CustomerDBContext context = new CustomerDBContext(ConnectionString );
无需担心报价。很多清洁工。
答案 2 :(得分:7)
使用EntityConnectionStringBuilder和SqlConnectionStringBuilder可以更轻松地根据需要更改参数。
答案 3 :(得分:2)
在web.config中设置多个连接字符串,然后按照以下步骤操作:
public partial class MyDatabaseEntities
{
public MyDatabaseEntities(string connection)
: base(connection)
{
}
}
然后在您想要创建实体实例的任何地方,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。
由于