只有在尝试创建Powershell Cmdlet时才会出现问题。我可以在控制台应用程序的进程记录中执行相同的代码。当时的想法是，App.config没有重定向程序集，但没有成功地使其工作。我使用了nuget包来引用Google api dotnet客户端

此处的示例代码
http://tinyurl.com/mbx3yle

错误
https://i.stack.imgur.com/Nr3zR.png

Get-GAppsUsers : Could not load file or assembly 'System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

PsTest.cs

using System.ComponentModel;
using System.Collections.Generic;
using Google.Apis.Admin.Directory.directory_v1.Data;
using System.Management.Automation;
using System;
using Google.Apis.Admin.Directory.directory_v1;
using Google.Apis.Authentication.OAuth2;
using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;
using Google.Apis.Services;
using Google.Apis.Util;
using System.Security.Cryptography.X509Certificates;

namespace PSTest
{
    [RunInstaller(true)]
    public class PsTest : PSSnapIn
    {
        /// <summary>
        /// Specify a description of the PowerShell snap-in.
        /// </summary>
        public override string Description
        {
            get
            {
                return "This is a PowerShell snap-in that includes the Google Apps Lib";
            }
        }
        /// <summary>
        /// Specify the localization resource information for the description.
        /// Use the format: resourceBaseName,Description.
        /// </summary>
        public override string DescriptionResource
        {
            get
            {
                return "GoogleAppsPSSnapIn,This is a PowerShell snap-in that includes the Google Apps Lib";
            }
        }
        /// <summary>
        /// Specify the name of the PowerShell snap-in.
        /// </summary>
        public override string Name
        {
            get
            {
                return "GoogleApps";
            }
        }
        /// <summary>
        /// Specify the vendor for the PowerShell snap-in.
        /// </summary>
        public override string Vendor
        {
            get
            {
                return "somecompany";
            }
        }
        /// <summary>
        /// Specify the localization resource information for the vendor.
        /// Use the format: resourceBaseName,VendorName.
        /// </summary>
        public override string VendorResource
        {
            get
            {
                return "GoogleAppsPSSnapIn,somecompany";
            }
        }
    }
    [Cmdlet("Get", "GAppsUsers")]
    public class GetGAppsUsers : PSCmdlet
    {

        protected override void ProcessRecord()
        {
            const string _serviceAccountCertPath = @"C:'cert.p12";
            const string _serviceAccountEmail = @"id@developer.gserviceaccount.com";
            const string _serviceAccountUser = @"someone@somewhere.com";
            var certificate = new X509Certificate2(
                _serviceAccountCertPath, "notasecret", X509KeyStorageFlags.Exportable);
            var scopes = DirectoryService.Scopes.AdminDirectoryUser.GetStringValue() + @" " +
                         DirectoryService.Scopes.AdminDirectoryGroup.GetStringValue() + @" " +
                         DirectoryService.Scopes.AdminDirectoryOrgunit.GetStringValue() + @" " +
                         DirectoryService.Scopes.AdminDirectoryDeviceChromeos.GetStringValue() + @" " +
                         DirectoryService.Scopes.AdminDirectoryDeviceMobile.GetStringValue() + @" " +
                         DirectoryService.Scopes.AdminDirectoryDeviceMobileAction.GetStringValue();
            var provider = new AssertionFlowClient(GoogleAuthenticationServer.Description, certificate)
            {
                ServiceAccountId = _serviceAccountEmail,
                Scope = @scopes
            };
            if (_serviceAccountUser != string.Empty)
            {
                provider.ServiceAccountUser = _serviceAccountUser;
            }
            var auth = new OAuth2Authenticator<AssertionFlowClient>(provider, AssertionFlowClient.GetState);
            var _directoryService = new DirectoryService((new BaseClientService.Initializer() { Authenticator = auth }));
            var service = _directoryService.Users.List();
            service.Customer = "my_customer";
            service.OrderBy = UsersResource.ListRequest.OrderByEnum.FamilyName;
            service.SortOrder = UsersResource.ListRequest.SortOrderEnum.ASCENDING;
            service.MaxResults = 500;
            var allUsers = new List<User>();
            var users = service.Execute();
            Int64 count = 0;
            if (String.IsNullOrEmpty(users.NextPageToken))
            {
                service.PageToken = users.NextPageToken;
                allUsers.AddRange(users.UsersValue);
                count = (count + users.UsersValue.Count);
                Console.Write(count + "...");
            }
            while (!String.IsNullOrEmpty(users.NextPageToken))
            {
                service.PageToken = users.NextPageToken;
                allUsers.AddRange(users.UsersValue);
                count = (count + users.UsersValue.Count);
                Console.Write(count + "...");
                users = service.Execute();
                if (String.IsNullOrEmpty(users.NextPageToken))
                {
                    service.PageToken = users.NextPageToken;
                    allUsers.AddRange(users.UsersValue);
                    count = (count + users.UsersValue.Count);
                    Console.Write(count + "...");
                }
            }
            WriteObject(allUsers);
        }
    }

}

应用程序配置

<?xml version="1.0"?>
<configuration>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Runtime" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
        <bindingRedirect oldVersion="0.0.0.0-2.5.19.0" newVersion="2.5.19.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Threading.Tasks" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
        <bindingRedirect oldVersion="0.0.0.0-2.5.19.0" newVersion="2.5.19.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
        <bindingRedirect oldVersion="0.0.0.0-2.1.10.0" newVersion="2.1.10.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Net.Http.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
        <bindingRedirect oldVersion="0.0.0.0-2.1.10.0" newVersion="2.1.10.0"/>
      </dependentAssembly>
    </assemblyBinding>
    <loadfromRemoteSources enabled="true"/>
  </runtime>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>

融合日志

    *** Assembly Binder Log Entry  (8/31/2013 @ 8:02:43 PM) ***
The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.
Assembly manager loaded from:  C:'Windows'Microsoft.NET'Framework64'v4.0.30319'clr.dll
Running under executable  C:'Windows'System32'WindowsPowerShell'v1.0'powershell.exe
--- A detailed error log follows. 
=== Pre-bind state information ===
LOG: User = NinjaWinMontage'mosheldon
LOG: DisplayName = System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
 (Fully-specified)
LOG: Appbase = file:///C:/Windows/System32/WindowsPowerShell/v1.0/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = powershell.exe
Calling assembly : Google.Apis, Version=1.5.0.28972, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in LoadFrom load context.
WRN: Native image will not be probed in LoadFrom context. Native image will only be probed in default load context, like with Assembly.Load().
LOG: Using application configuration file: C:'Windows'System32'WindowsPowerShell'v1.0'powershell.exe.Config
LOG: Using host configuration file: 
LOG: Using machine configuration file from C:'Windows'Microsoft.NET'Framework64'v4.0.30319'config'machine.config.
LOG: Post-policy reference: System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
LOG: GAC Lookup was unsuccessful.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives.DLL.
LOG: Assembly download was successful. Attempting setup of file: C:'Users'mosheldon'Desktop'PSTest'PSTest'bin'Debug'System.Net.Http.Primitives.dll
LOG: Entering run-from-source setup phase.
LOG: Assembly Name is: System.Net.Http.Primitives, Version=2.1.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
WRN: Comparing the assembly name resulted in the mismatch: Major Version
ERR: The assembly reference did not match the assembly definition found.
ERR: Run-from-source setup phase failed with hr = 0x80131040.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives/System.Net.Http.Primitives.EXE.
LOG: All probing URLs attempted and failed.
*** Assembly Binder Log Entry  (8/31/2013 @ 8:02:43 PM) ***
The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.
Assembly manager loaded from:  C:'Windows'Microsoft.NET'Framework64'v4.0.30319'clr.dll
Running under executable  C:'Windows'System32'WindowsPowerShell'v1.0'powershell.exe
--- A detailed error log follows. 
=== Pre-bind state information ===
LOG: User = NinjaWinMontage'mosheldon
LOG: DisplayName = System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
 (Fully-specified)
LOG: Appbase = file:///C:/Windows/System32/WindowsPowerShell/v1.0/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = powershell.exe
Calling assembly : Google.Apis, Version=1.5.0.28972, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in LoadFrom load context.
WRN: Native image will not be probed in LoadFrom context. Native image will only be probed in default load context, like with Assembly.Load().
LOG: Using application configuration file: C:'Windows'System32'WindowsPowerShell'v1.0'powershell.exe.Config
LOG: Using host configuration file: 
LOG: Using machine configuration file from C:'Windows'Microsoft.NET'Framework64'v4.0.30319'config'machine.config.
LOG: Post-policy reference: System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
LOG: GAC Lookup was unsuccessful.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives.DLL.
LOG: Assembly download was successful. Attempting setup of file: C:'Users'mosheldon'Desktop'PSTest'PSTest'bin'Debug'System.Net.Http.Primitives.dll
LOG: Entering run-from-source setup phase.
LOG: Assembly Name is: System.Net.Http.Primitives, Version=2.1.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
WRN: Comparing the assembly name resulted in the mismatch: Major Version
ERR: The assembly reference did not match the assembly definition found.
ERR: Run-from-source setup phase failed with hr = 0x80131040.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives/System.Net.Http.Primitives.EXE.
LOG: All probing URLs attempted and failed.
*** Assembly Binder Log Entry  (8/31/2013 @ 8:08:35 PM) ***
The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.
Assembly manager loaded from:  C:'Windows'Microsoft.NET'Framework64'v4.0.30319'clr.dll
Running under executable  C:'Windows'System32'WindowsPowerShell'v1.0'powershell.exe
--- A detailed error log follows. 
=== Pre-bind state information ===
LOG: User = NinjaWinMontage'mosheldon
LOG: DisplayName = System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
 (Fully-specified)
LOG: Appbase = file:///C:/Windows/System32/WindowsPowerShell/v1.0/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = powershell.exe
Calling assembly : Google.Apis, Version=1.5.0.28972, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in LoadFrom load context.
WRN: Native image will not be probed in LoadFrom context. Native image will only be probed in default load context, like with Assembly.Load().
LOG: Using application configuration file: C:'Windows'System32'WindowsPowerShell'v1.0'powershell.exe.Config
LOG: Using host configuration file: 
LOG: Using machine configuration file from C:'Windows'Microsoft.NET'Framework64'v4.0.30319'config'machine.config.
LOG: Post-policy reference: System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
LOG: GAC Lookup was unsuccessful.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives.DLL.
LOG: Assembly download was successful. Attempting setup of file: C:'Users'mosheldon'Desktop'PSTest'PSTest'bin'Debug'System.Net.Http.Primitives.dll
LOG: Entering run-from-source setup phase.
LOG: Assembly Name is: System.Net.Http.Primitives, Version=2.1.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
WRN: Comparing the assembly name resulted in the mismatch: Major Version
ERR: The assembly reference did not match the assembly definition found.
ERR: Run-from-source setup phase failed with hr = 0x80131040.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives/System.Net.Http.Primitives.EXE.
LOG: All probing URLs attempted and failed.
*** Assembly Binder Log Entry  (8/31/2013 @ 8:08:35 PM) ***
The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.
Assembly manager loaded from:  C:'Windows'Microsoft.NET'Framework64'v4.0.30319'clr.dll
Running under executable  C:'Windows'System32'WindowsPowerShell'v1.0'powershell.exe
--- A detailed error log follows. 
=== Pre-bind state information ===
LOG: User = NinjaWinMontage'mosheldon
LOG: DisplayName = System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
 (Fully-specified)
LOG: Appbase = file:///C:/Windows/System32/WindowsPowerShell/v1.0/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = powershell.exe
Calling assembly : Google.Apis, Version=1.5.0.28972, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in LoadFrom load context.
WRN: Native image will not be probed in LoadFrom context. Native image will only be probed in default load context, like with Assembly.Load().
LOG: Using application configuration file: C:'Windows'System32'WindowsPowerShell'v1.0'powershell.exe.Config
LOG: Using host configuration file: 
LOG: Using machine configuration file from C:'Windows'Microsoft.NET'Framework64'v4.0.30319'config'machine.config.
LOG: Post-policy reference: System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
LOG: GAC Lookup was unsuccessful.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Windows/System32/WindowsPowerShell/v1.0/System.Net.Http.Primitives/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives.DLL.
LOG: Assembly download was successful. Attempting setup of file: C:'Users'mosheldon'Desktop'PSTest'PSTest'bin'Debug'System.Net.Http.Primitives.dll
LOG: Entering run-from-source setup phase.
LOG: Assembly Name is: System.Net.Http.Primitives, Version=2.1.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
WRN: Comparing the assembly name resulted in the mismatch: Major Version
ERR: The assembly reference did not match the assembly definition found.
ERR: Run-from-source setup phase failed with hr = 0x80131040.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives/System.Net.Http.Primitives.DLL.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives.EXE.
LOG: Attempting download of new URL file:///C:/Users/mosheldon/Desktop/PSTest/PSTest/bin/Debug/System.Net.Http.Primitives/System.Net.Http.Primitives.EXE.
LOG: All probing URLs attempted and failed.

将System.Net.Http.Primitives版本2.1.10和1.5添加到GAC

Get-GAppsUsers : Method not found: 'Void System.Net.Http.HttpClientHandler.set_
AutomaticDecompression(System.Net.DecompressionMethods)'.