Question

我试图在不使用App.Config的情况下连接到数据库，但我一直收到以下错误：

EntityFramework.dll中出现未处理的“System.Data.Entity.Core.EntityException”类型异常

其他信息：基础提供程序在ConnectionString上失败。

我无法看到我出错的地方，所以我想我会在这里问。

Low

提前感谢您的帮助。

Answer 1

试试这个：make this parameterise

    public Entities(string connString)
        : base(connString)
    {
    }

并在创建Context类的对象时传递字符串连接字符串。

public class TestController : Controller
{
 Entity _context = new Entity("data source=Dev-4;initial catalog=test1;
 integrated security=True;MultipleActiveResultSets=True;  
 App=EntityFramework");
}

Answer 2

试试这个：在这里你需要一次又一次地传递连接字符串 - ＆gt;

    public Model1()
        : base(connString)
    {
    }

    public static string connString = "data source=tesst;initial catalog=test1;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework";

使用实体框架的数据库优先模型时使用此方法：

    public test1Entities()
         : base(nameOrConnectionString: ConnectionString())
    {
    }

    private static string ConnectionString()
    {
        SqlConnectionStringBuilder sqlBuilder = new SqlConnectionStringBuilder();
        sqlBuilder.DataSource = "DEV-4";
        sqlBuilder.InitialCatalog = "test1";
        sqlBuilder.PersistSecurityInfo = true;
        sqlBuilder.IntegratedSecurity = true;
        sqlBuilder.MultipleActiveResultSets = true;

        EntityConnectionStringBuilder entityBuilder = new EntityConnectionStringBuilder();
        entityBuilder.ProviderConnectionString = sqlBuilder.ToString();
        entityBuilder.Metadata = "res://*/";
        entityBuilder.Provider = "System.Data.SqlClient";

        return entityBuilder.ToString();
    }

Answer 3

问题是您直接在连接字符串上传递sdf文件。尝试更改：

ProviderConnectionString = @"C:\RestOfPath\database.sdf;Password=3476dfg423434563466e85rcsd"

要：

ProviderConnectionString = @"Data Source=C:\RestOfPath\database.sdf;Password=3476dfg423434563466e85rcsd"

或者更好的是，使用SqlCeConnectionStringBuilder来构造此属性：

var connectionStringBuilder = new SqlCeConnectionStringBuilder();
connectionStringBuilder.DataSource = @"C:\RestOfPath\database.sdf";
connectionStringBuilder.Password = "3476dfg423434563466e85rcsd";
EFConnectionBuilder.ProviderConnectionString = connectionStringBuilder.ToString(),

为什么我的Entity Framework连接字符串不起作用

3 个答案: