system.IO.FileLoadException: Mixed mode assembly is built against version 'v2.0.50727'...问题解决方案

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system.IO.FileLoadException: Mixed mode assembly is built against version ‘v2.0.50727’问题解决方案

加载了大恒图像的GxIAPINET.dll 文件后，出现了如下错误提示

system.IO.FileLoadException: 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.

经查阅资料，得到如下解决方案：
打开项目下的App.config文件

我的打开后是如下代码：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
</configuration>

在startup后面添加一句话 useLegacyV2RuntimeActivationPolicy=”true” ：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <startup useLegacyV2RuntimeActivationPolicy="true"> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
</configuration>

然后保存，然后先清除再重新编译，问题解决。