Question

简短版：

我需要在一个winforms应用程序（DEV，LIVE和DEMO）中循环遍历三个不同的连接字符串。我使用ConfigurationManager更新基本连接字符串。这有效。但是，我的DBContext仅尊重对连接字符串的第一次更改。其余的都被忽略了。

详细信息：

这些数据库都是使用相同的上下文构建的，代码优先。

我的App.config中有一个名为MY_DB的连接字符串。

这是主循环：

// Get the necessary Config values
string DEFAULT_DB = "MY_DB";
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConnectionStringsSection csSection = config.ConnectionStrings;
SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();
builder.ConnectionString = csSection.ConnectionStrings[DEFAULT_DB].ConnectionString;
string provider = csSection.ConnectionStrings[DEFAULT_DB].ProviderName;

System.Diagnostics.Debug.WriteLine(String.Format("Initial: {0}", builder["Initial Catalog"]));


// Loop through my databases
string[] catalogArray = { "live", "demo", "dev" };

foreach (string catalog in catalogArray)
{
    builder["Initial Catalog"] = catalog;
    config.ConnectionStrings.ConnectionStrings.Remove(DEFAULT_DB);
    config.ConnectionStrings.ConnectionStrings.Add(new ConnectionStringSettings(DEFAULT_DB, builder.ConnectionString, provider));
    config.ConnectionStrings.SectionInformation.ForceSave = true;
    config.Save(ConfigurationSaveMode.Full);

    // Tried both of these. Same results.
    // ConfigurationManager.RefreshSection("configuration");
    ConfigurationManager.RefreshSection("connectionStrings");

    System.Diagnostics.Debug.WriteLine(String.Format("Processing: {0}", csSection.ConnectionStrings[DEFAULT_DB].ConnectionString));

    DoDBStuff();

    // Also tried this. No joy.
    // System.GC.Collect();
}

这是DoDBStuff：

public void DoDBStuff()
    {
        using (MyContext db = new MyContext())
        {
            string connstr = db.Database.Connection.ConnectionString;
            SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder(connstr);
            string context = builder.InitialCatalog;
            System.Diagnostics.Debug.WriteLine(String.Format("DoDBStuff is Using: {0}", context));
        }
    }

这是输出（已消毒）：

/*
Initial: dev
Processing: Data Source=1.2.3.4;Initial Catalog=live;User ID=nope;Password=supersecure;MultipleActiveResultSets=True
DoDBStuff is Using: live
Processing: Data Source=1.2.3.4;Initial Catalog=demo;User ID=nope;Password=supersecure;MultipleActiveResultSets=True
DoDBStuff is Using: live
Processing: Data Source=1.2.3.4;Initial Catalog=dev;User ID=nope;Password=supersecure;MultipleActiveResultSets=True
DoDBStuff is Using: live
*/

所以，亲爱的Overflowers，为什么应用程序坚持只使用第一个配置'覆盖'而忽略其他配置？

顺便说一句，我很清楚我可以这样做：

MyContext db = new MyContext("CONNECTION_STRING_NAME");

我不想那样做。主要是因为我调用的很多静态方法都有自己的内部使用方法。像这样......

public static Customer ById(int id)
    {
        try
        {
            using (MyContext db = new MyContext())
            {
                return db.Customer.Find(id);
            }
        }
        catch
        {
            return null;
        }
    }

有太多人无法全部覆盖它们。

帮助！

多个ConfigurationManager更改无法更新DBContext

0 个答案: