在中等信任下使用 ODP.net 访问违规答案

【问题标题】：Access Violations with ODP.net under Medium Trust在中等信任下使用 ODP.net 访问违规
【发布时间】：2012-01-30 18:24:22
【问题描述】：

环境：

Windows Server 2008 R2
IIS 7.5
.NET 4.0, Integrated Application Pool
Oracle Client 11.2.0.2.0
ODP.net 11.2.0.2.3

我有一个使用 ODP.net 连接到我们的 Oracle 数据库的网站，并且在“完全信任”下，该应用程序可以完美运行。但是，当我将应用程序更改为使用“中等信任”时，我开始从应用程序中获得不一致的 NullReferenceExceptions。大多数情况下，代码都可以工作，但每 10 个请求左右我就会得到 NullReferenceException。在查看事件日志时，我看到 NullReferenceException 通常对应于 w3wp.exe 崩溃。

Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2
Faulting module name: OraOps11w.dll, version: 2.112.2.0, time stamp: 0x4cea1904
Exception code: 0xc0000005
Fault offset: 0x0000000000024d56
Faulting process id: 0x3ba4
Faulting application start time: 0x01ccdf556d68384a
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: C:\Oracle64\product\11.2.0\client\bin\OraOps11w.dll1

显然问题是 ODP.NET，但为什么它会在“Medium Trust”中崩溃 w3wp.exe。因此，为了确保我的代码没有做错，我编写了最简单的 ASP.NET Web 应用程序：

protected void Page_Load(object sender, EventArgs e) {
    using(OracleConnection conn = new OracleConnection(GetMyConnectionString())){
        using (OracleCommand cmd = new OracleCommand("select localtimestamp from dual", conn)) {
            conn.Open();
            this.aLiteral.Text = ((DateTime)cmd.ExecuteScalar()).ToLongDateString();
        }            
    }
}

在“完全信任”下，应用运行良好。在“中等信任”下，该应用似乎运行良好，但是当我将 IIS 调试诊断工具连接到该应用的应用程序池时，该应用抛出了数千个这样的错误：

[1/30/2012 12:50:25 PM] First chance exception - 0xe0434352 caused by thread with  System ID: 14832
[1/30/2012 12:50:25 PM] Stack Trace
RetAddr           : Args to Child                                                           : Call Site
000007fe`f9990845 : 00000000`04af0ed0 00000000`00000001 00000000`00000000 00000001`bfe3a0b8 : KERNELBASE!RaiseException+0x3d
000007fe`f9993226 : 00000001`bfe3a0b8 00000000`00000000 00000001`bfe3a0b8 00000001`bfe3a0b8 : clr!PreBindAssemblyEx+0x61681
000007fe`f7a61233 : 00000000`00000000 00000000`00000000 00000001`bfdca3b0 00000000`00000000 : clr!PreBindAssemblyEx+0x64062
000007fe`f7a61515 : 00000000`ffd5c9b8 00000000`ffd5c9b8 00000000`ffd5c9b8 00000000`00000000 : mscorlib_ni+0x9f1233
000007fe`f7b0f6e2 : 00000001`bfdca3b0 00000000`00000000 00000000`ffd5c9b8 00000000`ffd5c9b8 : mscorlib_ni+0x9f1515
000007fe`f9859714 : 00000001`3fb39a28 00000000`00000000 00000000`00000000 00000000`ffd5c9b8 : mscorlib_ni+0xa9f6e2
000007fe`f9859829 : 00000000`00000000 00000000`00000000 00000000`00000001 00000000`00000000 : clr!LogHelp_LogAssert+0x25a04
000007fe`f985bb74 : 00000000`0fb2d450 00000000`00000008 000007fe`f7a602e0 00000000`00000000 : clr!LogHelp_LogAssert+0x25b19
000007fe`f985c39c : 00000000`00000000 00000000`00000000 00001f80`0010000b 0053002b`002b0033 : clr!LogHelp_LogAssert+0x27e64
000007fe`f9da3ea1 : 00000000`00000000 00000000`0fb2d700 00000000`04af0ed0 00000000`0257ffc0 : clr!LogHelp_LogAssert+0x2868c
000007fe`f9da42e5 : 00000000`00000000 00000000`0fb2e600 00000000`04af0ed0 00000001`3fb39a28 : clr!GetAssemblyIdentityFromFile+0x2aa81
000007fe`f9da454d : 00000000`04af0ed0 00000000`00000000 00000001`3fb39a28 00000000`04af0ed0 : clr!GetAssemblyIdentityFromFile+0x2aec5
000007fe`f9da4aac : 00000000`ffd5c9b8 00000000`00000000 00000000`04af0ed0 00000000`0fb2d630 : clr!GetAssemblyIdentityFromFile+0x2b12d
000007fe`f9da4b9c : 00000000`0fb2d898 00000000`00000001 00000000`00000000 00000000`00000000 : clr!GetAssemblyIdentityFromFile+0x2b68c
000007fe`f9c32ecc : 00000000`00000081 00000000`00000000 00000000`00000000 00000000`00000000 : clr!GetAssemblyIdentityFromFile+0x2b77c
000007fe`f9e97004 : 000007ff`002653f8 00000000`0fb2dda0 000007fe`f6554288 00000000`ffd5c9b8 : clr!CreateAssemblyConfigCookie+0x9f93c
000007fe`f9ea54e8 : 000007fe`f6554288 00000000`00010400 00000000`00010400 00000000`00000000 : clr!TranslateSecurityAttributes+0x39bb4
000007fe`f9854b72 : 00000000`04af0ed0 000007fe`f9908c66 000007fe`00000000 00000000`00000000 : clr!TranslateSecurityAttributes+0x48098
000007fe`f67af41f : 000007ff`001b8140 000007fe`f6554288 00000001`bfdc3360 00000000`0fb2dc08 : clr!LogHelp_LogAssert+0x20e62
000007fe`f67a38e6 : 00000000`00000000 00000000`00000000 00000000`0fb2dd00 000007fe`f9861052 : System_ni+0x2bf41f
000007ff`001a5c34 : 000007ff`001b8140 00000000`00000000 00000000`00000000 000007fe`f99de765 : System_ni+0x2b38e6
000007ff`001a5a12 : 00000001`00000000 000007ff`001b8140 000007ff`001b8140 00000000`0fb2dda0 : 0x7ff`001a5c34
000007ff`00187109 : 000007ff`00187104 00000000`00000046 00000000`0fb24000 00000000`04af0ed0 : 0x7ff`001a5a12
000007fe`f73f30c8 : 00000001`3fb398f8 00000001`3fb39990 00000000`00000000 00000000`00000000 : 0x7ff`00187109
000007fe`f9859714 : 00000000`ffd991a0 00000001`bfdc30d0 00000000`00000000 00000000`00000000 : mscorlib_ni+0x3830c8
000007fe`f9859829 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : clr!LogHelp_LogAssert+0x25a04
000007fe`f98598a5 : 00000000`0fb2e038 00000000`00000002 00000000`0fb2e050 00000000`0fb2e248 : clr!LogHelp_LogAssert+0x25b19
000007fe`f998878a : 00000001`3fb39cd8 00000000`00000000 00000000`0fb2e4b8 00000000`0fb2e2f0 : clr!LogHelp_LogAssert+0x25b95
000007fe`f99885b1 : 00000001`3fb39cd8 00000000`025800c8 00000000`04af0ed0 00000000`025800c8 : clr!PreBindAssemblyEx+0x595c6
000007fe`f73e17b1 : 00000001`3fb39990 00000001`bfdc3090 00000001`ffb46070 00000000`00000000 : clr!PreBindAssemblyEx+0x593ed
000007fe`f73e16fb : 00000001`3fb39990 000007fe`f986200f 00000000`0fb2e558 00000000`00000000 : mscorlib_ni+0x3717b1
000007fe`f7476e5d : 000007ff`001b2020 00000000`000001be 00000001`3fb39990 00000000`0fb2e8d0 : mscorlib_ni+0x3716fb
000007fe`f9859714 : 00000001`3fb399b8 000007fe`f9838477 00000000`00000000 00000000`00000000 : mscorlib_ni+0x406e5d
000007fe`f9859829 : 00000000`00000000 00000000`00000000 000007fe`f7a35cf0 00000000`00000000 : clr!LogHelp_LogAssert+0x25a04
000007fe`f98598a5 : 00000000`0fb2e8c8 00000000`00000001 00000000`0fb2e8d0 00000000`0fb2eb20 : clr!LogHelp_LogAssert+0x25b19
000007fe`f9859d88 : 00000000`0fb2eb18 000007fe`f7374860 00000000`0fb2ebb0 000007fe`f713cd7c : clr!LogHelp_LogAssert+0x25b95
000007fe`f9a198a0 : 00000000`0fb2f380 00000000`0fb2eba0 00000000`0fb2f420 000007fe`f754dea0 : clr!LogHelp_LogAssert+0x26078
000007fe`f9869402 : 00000000`00000000 00000000`0fb2f380 00000000`04af0ed0 00000000`00000001 : clr!ClrCreateManagedInstance+0x1d00
000007fe`f9869397 : 00000000`00000000 00000000`770400e0 00000000`0fb2ee60 00000000`00392c70 : clr!LogHelp_LogAssert+0x356f2
000007fe`f9869304 : 00000000`04af12d0 000007fe`f986a0be ffffffff`fffffffe 00000000`003981f4 : clr!LogHelp_LogAssert+0x35687
000007fe`f9869604 : 00000000`0fb2f128 00000000`04af0ed0 00000000`00000000 00000000`04af0ed0 : clr!LogHelp_LogAssert+0x355f4
000007fe`f9c3305a : 00000000`00000000 00000000`02463320 00000000`0257ffc0 000007fe`fd2fb002 : clr!LogHelp_LogAssert+0x358f4
000007fe`f9869638 : 00000000`00000002 00000000`0fb2f380 00000000`0fb2f380 00000000`04af0ed0 : clr!CreateAssemblyConfigCookie+0x9faca
000007fe`f9869397 : 00000000`00000000 00000000`04af0ed0 ffffffff`fffffffe 00000000`04af0ed0 : clr!LogHelp_LogAssert+0x35928
000007fe`f9869304 : 00000000`00000048 00000000`00000001 00000000`00000000 00000000`00000000 : clr!LogHelp_LogAssert+0x35687
000007fe`f986945b : ffffffff`ffffffff 00000000`04af0ed0 00000000`00000000 00000000`00000000 : clr!LogHelp_LogAssert+0x355f4
000007fe`f9a196f0 : 00000000`04af0ed0 00000000`0fb2f840 00000000`00000001 00000000`00000000 : clr!LogHelp_LogAssert+0x3574b
000007fe`f998a7c2 : 00000000`04ac1960 00000000`0fb2f438 00000000`04af0ed0 00000000`00000000 : clr!ClrCreateManagedInstance+0x1b50
00000000`76e3652d : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : clr!PreBindAssemblyEx+0x5b5fe
00000000`7706c521 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : kernel32!BaseThreadInitThunk+0xd
00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!RtlUserThreadStart+0x21
OS Thread Id: 0x39f0 (30)
Child SP         IP               Call Site
000000000fb2ced8 000007fefd2fcacd [HelperMethodFrame: 000000000fb2ced8] 
000000000fb2d020 000007fef7a61233 System.Security.CodeAccessSecurityEngine.ThrowSecurityException(System.Reflection.RuntimeAssembly, System.Security.PermissionSet, System.Security.PermissionSet, System.RuntimeMethodHandleInternal, System.Security.Permissions.SecurityAction, System.Object, System.Security.IPermission)
000000000fb2d0b0 000007fef7a61515 System.Security.CodeAccessSecurityEngine.CheckHelper(System.Security.PermissionSet, System.Security.PermissionSet, System.Security.CodeAccessPermission, System.Security.PermissionToken, System.RuntimeMethodHandleInternal, System.Object, System.Security.Permissions.SecurityAction, Boolean)
000000000fb2d120 000007fef7b0f6e2 System.Security.PermissionListSet.CheckDemand(System.Security.CodeAccessPermission, System.Security.PermissionToken, System.RuntimeMethodHandleInternal)
000000000fb2d518 000007fef9859714 [GCFrame: 000000000fb2d518] 
000000000fb2d6d0 000007fef9859714 [GCFrame: 000000000fb2d6d0] 
000000000fb2d828 000007fef9859714 [GCFrame: 000000000fb2d828] 
000000000fb2d8d8 000007fef9859714 [DebuggerSecurityCodeMarkFrame: 000000000fb2d8d8] 
000000000fb2d9b8 000007fef9859714 [HelperMethodFrame: 000000000fb2d9b8] System.StubHelpers.StubHelpers.BeginStandalone(IntPtr, IntPtr, Int32)
000000000fb2dc08 000007fef67af41f [NDirectMethodFrameStandalone: 000000000fb2dc08] Microsoft.Win32.NativeMethods.GetCurrentProcessId()
000000000fb2dbd0 000007fef67af41f DomainNeutralILStubClass.IL_STUB_PInvoke()
000000000fb2dc90 000007fef67a38e6 System.Diagnostics.Process.GetCurrentProcess()
000000000fb2dce0 000007ff001a5c34 Oracle.DataAccess.Client.OracleTuningAgent.GetCurrentVirtualMemorySize()
000000000fb2dd30 000007ff001a5a12 Oracle.DataAccess.Client.OracleTuningAgent.DoScan()
000000000fb2dd80 000007ff00187109 Oracle.DataAccess.Client.OracleTuningAgent.TuningFunction()
000000000fb2de10 000007fef73f30c8 System.Threading.ExecutionContext.runTryCode(System.Object)
000000000fb2e538 000007fef9859714 [HelperMethodFrame_PROTECTOBJ: 000000000fb2e538] System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode, CleanupCode, System.Object)
000000000fb2e660 000007fef73e17b1 System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
000000000fb2e6c0 000007fef73e16fb System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
000000000fb2e710 000007fef7476e5d System.Threading.ThreadHelper.ThreadStart()
000000000fb2eb68 000007fef9859714 [GCFrame: 000000000fb2eb68] 
000000000fb2ef50 000007fef9859714 [DebuggerU2MCatchHandlerFrame: 000000000fb2ef50] 
000000000fb2f128 000007fef9859714 [ContextTransitionFrame: 000000000fb2f128] 
000000000fb2f310 000007fef9859714 [DebuggerU2MCatchHandlerFrame: 000000000fb2f310]

我按照 ODP.NET README 中的说明将 OraclePermission 添加到 web_mediumtrust.config（32 位和 64 位），但仍然遇到相同的错误。

任何想法如何让 ODP.NET 与“Medium Trust”一起正常工作？

这是我的 web_mediumtrust.config：

<configuration>
  <mscorlib>
    <security>
      <policy>
        <PolicyLevel version="1">
          <SecurityClasses>
            <SecurityClass Name="AllMembershipCondition" Description="System.Security.Policy.AllMembershipCondition, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="AspNetHostingPermission" Description="System.Web.AspNetHostingPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="DnsPermission" Description="System.Net.DnsPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="EnvironmentPermission" Description="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="FileIOPermission" Description="System.Security.Permissions.FileIOPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="FirstMatchCodeGroup" Description="System.Security.Policy.FirstMatchCodeGroup, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="IsolatedStorageFilePermission" Description="System.Security.Permissions.IsolatedStorageFilePermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="NamedPermissionSet" Description="System.Security.NamedPermissionSet" />
            <SecurityClass Name="PrintingPermission" Description="System.Drawing.Printing.PrintingPermission, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
            <SecurityClass Name="SecurityPermission" Description="System.Security.Permissions.SecurityPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="SmtpPermission" Description="System.Net.Mail.SmtpPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="SqlClientPermission" Description="System.Data.SqlClient.SqlClientPermission, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="StrongNameMembershipCondition" Description="System.Security.Policy.StrongNameMembershipCondition, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="TypeDescriptorPermission" Description="System.Security.Permissions.TypeDescriptorPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="UIPermission" Description="System.Security.Permissions.UIPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="UnionCodeGroup" Description="System.Security.Policy.UnionCodeGroup, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="UrlMembershipCondition" Description="System.Security.Policy.UrlMembershipCondition, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="WebPermission" Description="System.Net.WebPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="ZoneMembershipCondition" Description="System.Security.Policy.ZoneMembershipCondition, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="ReflectionPermission" Description="System.Security.Permissions.ReflectionPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <SecurityClass Name="OraclePermission" Description="System.Data.OracleClient.OraclePermission, System.Data.OracleClient, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
          </SecurityClasses>
          <NamedPermissionSets>
            <PermissionSet class="NamedPermissionSet" version="1" Unrestricted="true" Name="FullTrust" Description="Allows full access to all resources" />
            <PermissionSet class="NamedPermissionSet" version="1" Name="Nothing" Description="Denies all resources, including the right to execute" />
            <PermissionSet class="NamedPermissionSet" version="1" Name="ASP.Net">
              <IPermission class="AspNetHostingPermission" version="1" Level="Medium" />
              <IPermission class="DnsPermission" version="1" Unrestricted="true" />
              <IPermission class="EnvironmentPermission" version="1" Read="TEMP;TMP;USERNAME;OS;COMPUTERNAME" />
              <IPermission class="FileIOPermission" version="1" Read="$AppDir$" Write="$AppDir$" Append="$AppDir$" PathDiscovery="$AppDir$" />
              <IPermission class="IsolatedStorageFilePermission" version="1" Allowed="AssemblyIsolationByUser" UserQuota="9223372036854775807" />
              <IPermission class="PrintingPermission" version="1" Level="DefaultPrinting" />
              <IPermission class="SecurityPermission" version="1" Flags="Execution, ControlThread, ControlPrincipal, RemotingConfiguration" />
              <IPermission class="SmtpPermission" version="1" Access="Connect" />
              <IPermission class="SqlClientPermission" version="1" Unrestricted="true" />
              <IPermission class="TypeDescriptorPermission" version="1" Unrestricted="true" />
              <IPermission class="WebPermission" version="1" Unrestricted="true" />
              <IPermission class="ReflectionPermission" version="1" Flags="RestrictedMemberAccess" />
              <IPermission class="OraclePermission" version="1" Unrestricted="true" />
              <IPermission class="Oracle.DataAccess.Client.OraclePermission, Oracle.DataAccess, Version=4.112.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" version="1" Unrestricted="true" />
            </PermissionSet>
          </NamedPermissionSets>
          <CodeGroup class="FirstMatchCodeGroup" version="1" PermissionSetName="Nothing">
            <IMembershipCondition class="AllMembershipCondition" version="1" />
            <CodeGroup class="UnionCodeGroup" version="1" PermissionSetName="ASP.Net">
              <IMembershipCondition class="UrlMembershipCondition" version="1" Url="$AppDirUrl$/*" />
            </CodeGroup>
            <CodeGroup class="UnionCodeGroup" version="1" PermissionSetName="ASP.Net">
              <IMembershipCondition class="UrlMembershipCondition" version="1" Url="$CodeGen$/*" />
            </CodeGroup>
          </CodeGroup>
        </PolicyLevel>
      </policy>
    </security>
  </mscorlib>
</configuration>

【问题讨论】：

这是 .NET 4.0 还是 3.5？您使用的是哪个 IIS 应用程序池？集成、经典等？我只是好奇，因为我注意到基于这些的 ODP 的奇怪行为。
我发现 ODP.NET 过去有太多缺陷，因此永远放弃了它 - 再也没有回头...
放弃它是为了什么？...微软已经放弃了对 oracle 客户端的支持
@ZachGreen 放弃了它的商业用途（来自 Devart）。

标签： c# asp.net asp.net-mvc odp.net

【解决方案1】：

从错误消息来看，我相信这里发生的情况是，当应用程序运行时，ODP.net 库有时会在单独的线程上生成一个OracleTuningAgent。当OracleTuningAgent 正在执行时，它会调用：

System.Diagnostics.Process.GetCurrentProcess()

调用GetCurrentProcessrequires Full Trust，当您在中等信任下运行时会导致SecurityException。由于异常不会在请求线程上发生并且未处理，it causes the web application to recycle（请参阅风险 #1）。

为了确保我创建了一个测试 Web 应用程序并将其设置为中等信任。然后我尝试拨打System.Diagnostics.Process.GetCurrentProcess()，我得到了以下异常：

安全异常

应用程序试图执行不允许的操作安全政策。授予此应用程序所需的权限请联系您的系统管理员或更改应用程序的配置文件中的信任级别。

异常详细信息：System.Security.SecurityException：请求失败。

我也尝试了 High Trust 并得到了相同的结果。在完全信任下运行，我的测试应用运行良好。

所以要回答所提出的问题，ODP.net 似乎导致 w3wp 在中等信任下崩溃，因为对 Process.GetCurrentProcess() 的调用需要完全信任。如果有一些方法，您也许可以让您的代码在中等信任下工作：

配置 .NET 以便对 Process.GetCurrentProcess() 的调用可以在中等信任下工作
（我尝试过但无法找到方法，但这当然并不意味着不可能），或者李>
关闭 ODP.net 中的OracleTuningAgent

【讨论】：

另外，这个问题的答案可能很有用，但从您的问题看来，您可能已经尝试过这种方法（stackoverflow.com/questions/7846432/…）。
一个长镜头，但尝试禁用自调整，看看它是否有帮助。这可以在 web.config 文件或 machine.config 甚至注册表中完成。例如
您的解释似乎正确，但令人惊讶的是，我似乎无法禁用 OracleTuningAgent。我已经分别并同时尝试了所有 3 种方法，并且我继续看到上面的错误，显示 OracleTuningAgent 调用 GetCurrentProcess，如您所描述的。我更改了注册表设置（以防万一），将“Self Tuning=False”添加到连接字符串中，并添加了 web.config 设置。这正在慢慢扼杀我对生活的热情。
Hrm，您仍然看到同样的错误？ OracleTuningAgent 仍然出现在堆栈跟踪中？另外，我一直在考虑这个问题，即使我不完全理解如何，我很确定有一种方法可以使用 web_mediumtrust.config 文件在介质下调用 GetCurrentProcess() （如果我错了那，那么我只能得出结论，ODP.net 不能在中等信任下运行，这似乎不太可能）。您可以在问题中发布您添加到 web_mediumtrust.config 的信息吗？
您可以忽略第一次机会异常，它们是正常的，不会引起问题，详情请参阅stackoverflow.com/questions/564681/… 和stackoverflow.com/questions/2020374/a-first-chance-exception。