Question

似乎是一个微不足道的问题，但令人惊讶的是，只找到了一些像this one这样的解决方案，它们解释了如何使用弃用函数添加一些属性。我宁愿想编辑一个。那么，它是如何在.NET 4.0中完成的？

更具体地说，需要在<connectionStrings>属性中设置数据库的位置。

Answer 1

此代码改编自this blog post并在.NET 4上进行测试：

using System;
using System.Configuration;

class Program
{
    static void ShowConfig()
    {
        // For read access you do not need to call the OpenExeConfiguraton
        foreach (ConnectionStringSettings item in ConfigurationManager.ConnectionStrings)
        {
            Console.WriteLine("Key: {0}, Value: {1}", item.Name, item.ConnectionString);
        }
    }

    static void Main(string[] args)
    {
        ShowConfig();

        var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

        var conSettings = new ConnectionStringSettings("NewName", "New connstring value");
        config.ConnectionStrings.ConnectionStrings.Add(conSettings);
        config.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection("connectionStrings");

        Console.WriteLine("===UPDATE===");
        ShowConfig();

        Console.Read();
    }
}

的App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <connectionStrings>
        <add name="db1" connectionString="blah"/>
    </connectionStrings>
</configuration>

在我的电脑上打印

Key: LocalSqlServer, Value: data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true
Key: db1, Value: blah
===UPDATE===
Key: LocalSqlServer, Value: data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true
Key: db1, Value: blah
Key: NewName, Value: New connstring value

在飞行中修改app.config

1 个答案: