.NET Core 9调用Get-ExoMailbox遇程序集不匹配错误求助

环境与现象 #

• 在服务器PowerShell ISE中运行以下脚本可正常执行：

# Connect to Exchange Online
$CertThumbPrint = "111"
$AppID = "222"
$Org = "333.onmicrosoft.com"
Connect-ExchangeOnline -CertificateThumbPrint $CertThumbPrint -AppID $AppID -Organization $Org

# Get Mailboxes
$Mailboxes = Get-Mailbox -ResultSize 5 
Write-Output $Mailboxes | format-table 

• 同一服务器上，IIS托管的.NET Core 9应用通过以下C#代码调用PowerShell时，执行到Get-ExoMailbox -ResultSize Unlimited出现0x80131040程序集不匹配错误，提示无法加载Microsoft.Identity.Client.dll，其清单定义与引用不匹配。
• 前置命令（设置执行策略、导入模块、连接Exchange Online）均正常运行，仅该命令报错。
• 已确认：
  • 执行策略设为Unrestricted（Process范围）
  • 仅安装ExchangeOnlineManagement 3.8.0模块
  • C#项目已安装Microsoft.PowerShell.SDK和System.Management.Automation NuGet包
  • 目标版本4.66.1的Microsoft.Identity.Client.dll存在

.NET Core出错的C#代码 #

var mailboxes = new List<IrMailBox>();

using var runspace = RunspaceFactory.CreateRunspace();
runspace.Open();

using var pipeline = runspace.CreatePipeline();

string script = @"
Set-ExecutionPolicy Unrestricted -Scope Process;
Import-Module ExchangeOnlineManagement;
Connect-ExchangeOnline -AppId '123' -CertificateThumbprint '123' -Organization '123.onmicrosoft.com';
Get-ExoMailbox -ResultSize Unlimited
";

pipeline.Commands.AddScript(script);
var results = pipeline.Invoke();

foreach (var result in results)
{
    var psObject = result.BaseObject as PSObject;
    if (psObject != null)
    {
        mailboxes.Add(new IrMailBox
        {
            DisplayName = psObject.Properties["DisplayName"]?.Value?.ToString(),
            PrimarySmtpAddress = psObject.Properties["PrimarySmtpAddress"]?.Value?.ToString()
        });
    }
}

runspace.Close();
return mailboxes;

解决方案 #

方案1：添加程序集绑定重定向 #

在PowerShell脚本中添加临时配置文件，强制模块使用指定版本的Microsoft.Identity.Client：

string script = @"
Set-ExecutionPolicy Unrestricted -Scope Process -Force;
# 创建程序集绑定重定向配置
$bindingConfig = @'
<configuration>
  <runtime>
    <assemblyBinding xmlns=""urn:schemas-microsoft-com:asm.v1"">
      <dependentAssembly>
        <assemblyIdentity name=""Microsoft.Identity.Client"" publicKeyToken=""0a613f4dd989e8ae"" culture=""neutral"" />
        <bindingRedirect oldVersion=""0.0.0.0-4.66.1.0"" newVersion=""4.66.1.0"" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>
'@
$configPath = Join-Path $env:TEMP 'powershell.config.json'
Set-Content -Path $configPath -Value $bindingConfig -Encoding utf8

Import-Module ExchangeOnlineManagement;
Connect-ExchangeOnline -AppId '123' -CertificateThumbprint '123' -Organization '123.onmicrosoft.com';
Get-ExoMailbox -ResultSize Unlimited

# 清理临时配置文件
Remove-Item $configPath -Force
";

原理：PowerShell会读取临时目录下的powershell.config.json，通过绑定重定向统一程序集版本，避免冲突。

方案2：启动独立PowerShell进程执行脚本 #

绕过进程内程序集冲突，通过启动独立的PowerShell进程执行脚本，再通过JSON传递结果：

var mailboxes = new List<IrMailBox>();
var scriptContent = @"
Set-ExecutionPolicy Unrestricted -Scope Process -Force;
Import-Module ExchangeOnlineManagement;
Connect-ExchangeOnline -AppId '123' -CertificateThumbprint '123' -Organization '123.onmicrosoft.com';
Get-ExoMailbox -ResultSize Unlimited | Select-Object DisplayName, PrimarySmtpAddress | ConvertTo-Json
";

var psi = new ProcessStartInfo
{
    FileName = "pwsh.exe", // 服务器装的是Windows PowerShell则用powershell.exe
    Arguments = $"-NoProfile -Command \"{scriptContent}\"",
    RedirectStandardOutput = true,
    RedirectStandardError = true,
    UseShellExecute = false,
    CreateNoWindow = true
};

using var process = Process.Start(psi);
process.WaitForExit();

var output = process.StandardOutput.ReadToEnd();
var error = process.StandardError.ReadToEnd();

if (!string.IsNullOrEmpty(error))
{
    throw new Exception($"PowerShell执行错误: {error}");
}

if (!string.IsNullOrEmpty(output))
{
    var mailboxList = System.Text.Json.JsonSerializer.Deserialize<List<IrMailBox>>(output);
    if (mailboxList != null)
    {
        mailboxes.AddRange(mailboxList);
    }
}

return mailboxes;

原理：独立进程的PowerShell使用自身的程序集上下文，不会与.NET Core应用的程序集产生冲突，通过JSON序列化/反序列化传递数据。

方案3：同步模块与NuGet包版本 #

尝试升级ExchangeOnlineManagement模块到最新稳定版，或调整C#项目中Microsoft.PowerShell.SDK、System.Management.Automation的版本，确保模块依赖的程序集版本与项目引用版本兼容。

内容的提问来源于stack exchange，提问作者soomon