20190705_关于winform程序修改程序名后, 报未将对象引用设置到对象的实例

winform做了一个小项目, 其中要用到数据库连接, 字符串,

   private string ConnStringSource =   System.Configuration.ConfigurationManager.ConnectionStrings["ConnStringSource"].ConnectionString;

　就直接用的app.config配置文件

开发完成后, 也没有打包, 直接用debug下的文件发给用户了, 用户试用后, 觉得名字是英文的不方便, 想改下中文名

, 这个图是项目本来的名字;

,这个图是用户修改后的名字;

改完名字之后, 就一直包下图的经典错误:

解决办法是:

将配置文件也对应的改名, 比如你将 PrintBindRFID.exe 修改为 RFID打印.exe , 那么配置文件也得改成 RFID打印.exe.config;

问题到这里就解决了, 那么为什么是这样的呢?

看看System.Configuration.ConfigurationManager.ConnectionStrings 类的源码就知道了;

public static ConnectionStringSettingsCollection ConnectionStrings

{

    get

    {

        object obj2 = GetSection("connectionStrings");

        if ((obj2 == null) || (obj2.GetType() != typeof(ConnectionStringsSection)))

        {

            throw new ConfigurationErrorsException(SR.GetString("Config_connectionstrings_declaration_invalid"));

        }

        ConnectionStringsSection section = (ConnectionStringsSection) obj2;

        return section.ConnectionStrings; //配置字符串从这个方法来

    }

}

//-----------------------------------------------------------------------------------------

public static object GetSection(string sectionName)

{

    if (string.IsNullOrEmpty(sectionName))

    {

        return null;

    }

    PrepareConfigSystem();

    return s_configSystem.GetSection(sectionName);//从这里来

}

  private static void EnsureConfigurationSystem()

    {

        object obj2 = s_initLock;

        lock (obj2)

        {

            if (s_initState < 2)

            {

                s_initState = 1;

                try

                {

                    try

                    {

                        //s_configSystem使用这个进行实例化的, 转到它的构造函数

                        s_configSystem = new ClientConfigurationSystem();

                        s_initState = 2;

                    }

                    catch (Exception exception)

                    {

                        s_initError = new ConfigurationErrorsException(SR.GetString("Config_client_config_init_error"), exception);

                        throw s_initError;

                    }

                }

                catch

                {

                    s_initState = 3;

                    throw;

                }

            }

        }

    }

//-----------------------------------------------------------------------------------------

internal ClientConfigurationSystem()

{

    this._configSystem = new ConfigSystem();

    //ClientConfigurationHost看下这个类里面

    this._configSystem.Init(typeof(ClientConfigurationHost), new object[2]);

    this._configHost = (ClientConfigurationHost) this._configSystem.Host;

    this._configRoot = this._configSystem.Root;

    this._configRoot.ConfigRemoved += new InternalConfigEventHandler(this.OnConfigRemoved);

    this._isAppConfigHttp = this._configHost.IsAppConfigHttp;

    string schemeDelimiter = Uri.SchemeDelimiter;

}

//-----------------------------------------------------------------------------------------

internal sealed class ClientConfigurationHost : DelegatingConfigHost, IInternalConfigClientHost

{

    // Fields

    private ClientConfigPaths _configPaths;

    private string _exePath;

    private ExeConfigurationFileMap _fileMap;

    private bool _initComplete;

    private const string ConfigExtension = ".config";

    internal const string ExeConfigName = "EXE";  //看到这里就不用再看下去了

    internal const string ExeConfigPath = "MACHINE/EXE";

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20190705_关于winform程序修改程序名后, 报未将对象引用设置到对象的实例

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