用户''登录失败,无法打开登录请求的数据库"Database1.mdf".登录失败.用户'rBcollo-PC\rBcollo'登录失败

Question

所以..我几乎完成了所有的问题.但现在我处理另一个问题.我使用了这个连接字符串:

SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;Database=Database1.mdf");

它会抛出下一个错误:

用户登录失败'

如果我删除.mdf扩展名,它会抛出相同的错误

现在,如果我将以下内容添加到字符串:

Integrated Security = true

它抛出这个:

无法打开登录请求的数据库"Database1.mdf".登录失败.用户'rBcollo-PC\rBcollo'登录失败.

PS for Integrated Security = false它会抛出"登录失败的用户"

问题是我没有使用数据库的任何用户名或密码.

有什么帮助吗？

Answer 1

注意:如果您使用EntityFramework Core,我的回答将适用SQL Server

此错误可能是因为' Database does not exist'和应用程序尝试执行数据库操作的原因.

在执行任何数据库操作之前,您只需使用以下行.

_context.Database.EnsureCreated(); 

什么是EnsureCreated？

    // Summary:
    //     Ensures that the database for the context exists. If it exists, no action is
    //     taken. If it does not exist then the database and all its schema are created.
    //     If the database exists, then no effort is made to ensure it is compatible with
    //     the model for this context.
    //     Note that this API does not use migrations to create the database. In addition,
    //     the database that is created cannot be later updated using migrations. If you
    //     are targeting a relational database and using migrations, you can use the DbContext.Database.Migrate()
    //     method to ensure the database is created and all migrations are applied.
    //
    // Returns:
    //     True if the database is created, false if it already existed.