SSIS脚本任务使用AWSSDK.Core的RegionEndpoint类时触发异常的问题求助

我们目前在开发SSIS的Script Task，目标框架为.NET Framework v4.7，对应的C#语言版本是v7.3。代码本身可以成功编译，但在Visual Studio中运行时，只要执行这行代码：

RegionEndpoint regionEndpoint = RegionEndpoint.USEast1;

就一定会触发以下异常：

at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)

at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)

at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)

at Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript()

为了排查问题，我们做了测试：如果把这行代码注释掉，脚本任务就能正常运行。所以可以确定，问题的根源就是这一行代码。

我们非常感谢大家能提供任何相关的提示和建议！

详细信息 #

1. 项目文件片段： #

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
...
    <TargetFrameworkVersion>v4.7</TargetFrameworkVersion>
...
  </PropertyGroup>
...
  <ItemGroup>
    <Reference Include="AWSSDK.Core, Version=3.3.0.0, Culture=neutral, PublicKeyToken=885c28607f98e604, processorArchitecture=MSIL">
      <HintPath>C:\my\work\xxx\packages\AWSSDK.Core.3.7.402.3\lib\net45\AWSSDK.Core.dll</HintPath>
    </Reference>
    <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
      <HintPath>C:\Users\user.name\AppData\Local\Temp\Vsta\SSIS_ST160\xxx\packages\Newtonsoft.Json.13.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
    </Reference>
    <Reference Include="System" />
    <Reference Include="System.Data" />
    <Reference Include="System.Windows.Forms" />
    <Reference Include="System.Xml" />
    <Reference Include="Microsoft.SqlServer.ManagedDTS, Version=16.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
    <Reference Include="Microsoft.SqlServer.ScriptTask, Version=16.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
  </ItemGroup>
...
</Project>

2. SSIS中C#脚本任务的源代码： #

#region Namespaces
using System;
using Amazon;
#endregion

namespace ST_xxx
{
    [Microsoft.SqlServer.Dts.Tasks.ScriptTask.SSISScriptTaskEntryPointAttribute]
    public partial class ScriptMain : Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTARTScriptObjectModelBase
    {
        public async System.Threading.Tasks.Task Main()
        {
            try
            {
                string regionName = "us-east-1";
                RegionEndpoint regionEndpoint = RegionEndpoint.USEast1;
            }
            catch (Exception ex)
            {
                Dts.Events.FireError(0, "Error", ex.Message, string.Empty, 0);
                throw;
            }

            Dts.TaskResult = (int)ScriptResults.Success;
        }

        #region ScriptResults declaration
        enum ScriptResults
        {
            Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success,
            Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure
        };
        #endregion

    }
}

备注：内容来源于stack exchange，提问作者Mike