MVC项目部署至Somee后从数据库取数时提示找不到指定文件

Hey there, let's dig into this issue you're facing after deploying your MVC project to Somee. That Win32Exception usually points to a problem with how your app is trying to access the database, so let's break down the most likely fixes step by step:

1. Fix Your Connection String (Most Common Culprit) #

The #1 reason for this error on Somee is using a local-style connection string that references a .mdf file path that doesn't exist on the server. For example, if your local config uses AttachDbFilename=|DataDirectory|\YourDb.mdf, that path won't translate to the Somee server environment.

Replace your connection string in Web.config with the exact one provided by Somee in your dashboard:

<connectionStrings>
  <add name="MartCoConnection" 
       connectionString="Server=your-server-name.somee.com;Database=your-database-name;User Id=your-db-username;Password=your-db-password;Trusted_Connection=False;" 
       providerName="System.Data.SqlClient" />
</connectionStrings>

• Double-check that the name matches what's used in your MartCoContext class (e.g., if your context uses base("MartCoConnection"), the name must match exactly).

2. Verify Your Database is Properly Deployed #

Even with the right connection string, if your database doesn't exist on Somee or lacks the necessary tables/data, you'll hit errors:

• Log into your Somee control panel, navigate to the Databases section, and confirm your database is listed.
• If you're using Code First:
  • Ensure migrations are enabled. Add this to your Global.asax.cs Application_Start method to auto-apply migrations on deployment:

    using System.Data.Entity;
    // ...
    protected void Application_Start()
    {
        Database.SetInitializer(new MigrateDatabaseToLatestVersion<MartCoContext, WebApplication16.DAL.Configuration>());
        // Rest of your startup code
    }
    

  • Alternatively, generate migration scripts locally (using Update-Database -Script in Package Manager Console) and run them manually via Somee's database management tool.

3. Check for Missing Dependencies or File Permissions #

If you're using a file-based database (like SQLite) instead of SQL Server:

• Make sure the database file is uploaded to the correct directory on Somee (usually the App_Data folder).
• Set the file's permissions to allow read/write access (you can adjust this in the Somee file manager).
• Avoid hardcoding local file paths in your code—use Server.MapPath("~/App_Data/YourDb.db") instead.

4. Validate Your Context Class Setup #

Double-check your MartCoContext class to ensure it's correctly referencing the connection string:

namespace WebApplication16.DAL
{
    public class MartCoContext : DbContext
    {
        // Use the exact name from your Web.config connection string
        public MartCoContext() : base("MartCoConnection")
        {
            // Optional: Disable lazy loading if you're having issues
            // this.Configuration.LazyLoadingEnabled = false;
        }

        // Define your DbSets here
        public DbSet<YourModel> YourModels { get; set; }
    }
}

Start with the connection string fix—this is almost always the issue when you see that "file not found" error after deploying to a shared host like Somee.

内容的提问来源于stack exchange，提问作者Talha Waseem