在运行安装程序、安装程序类时创建表时，针对版本“v2.0.50727”出现混合模式程序集错误

Question

我有窗口应用程序，制作了一些

custom action

，编辑

userinterface

在安装应用程序时从用户检索值，并在创建表时进一步在安装程序类中检索值，出现以下错误消息

Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot
be loaded in the 4.0 runtime without additional configuration information.

我用谷歌搜索了很多，发现添加下面的内容可以解决问题（对我不起作用）

 <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
    <supportedRuntime version="v2.0.50727"/>
  </startup>

以前我的 app.confg 看起来像

<startup>
      <supportedRuntime version="v2.0.50727"/>
  </startup>

代码：Installer1.cs

public override void Install(IDictionary stateSaver)
        {
            base.Install(stateSaver);
            string targetDirectory = Context.Parameters["targetdir"];
            string servername = Context.Parameters["dbservername"];
            string dbname = Context.Parameters["dbname"];
            string strconnectionstring = "Data Source='" + servername + "';Initial Catalog='" + dbname + "';Integrated Security=True";

            if (servername == "")
            {
                throw new InstallException("You did not Specify SQL Servername!");
            }

            else if (dbname == "")
            {
                throw new InstallException("You did not specify the database name!");
            }

            string exePath = string.Format("{0}abc..exe", targetDirectory);
            System.Configuration.Configuration conf = ConfigurationManager.OpenExeConfiguration(exePath);
            conf.ConnectionStrings.ConnectionStrings["abc"].ConnectionString = strconnectionstring;
            conf.Save(ConfigurationSaveMode.Modified);


            using (SqlConnection con1 = new SqlConnection(strconnectionstring))
            {
                System.Diagnostics.Debugger.Break();
                string getScript = "Use " + dbname + "; CREATE TABLE supportContacts ( id int identity primary key,  type varchar(20),  details varchar(30)  )";
               // string strscript = getScript;
                Server server = new Server(new ServerConnection(con1));
                server.ConnectionContext.ExecuteNonQuery(getScript );
                con1.Close();
            }   


        }

在调试时我发现错误发生在

server.ConnectionContext.ExecuteNonQuery(strupdatescript);

Answer 1

对我来说以下工作有效：

<startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>

Answer 2

我也有同样的问题。如果有人能指出什么可以解决这个问题，非常感激。

我找到了答案:)。为我工作。

https://web.archive.org/web/20230128073937/http://reedcopsey.com/2011/09/15/setting-uselegacyv2runtimeactivationpolicy-at-runtime/