Question

将我的asp.net webform网站从Owin 2.1.0升级到Owin 3.0.1之后，我有前面提到的编译错误......我还尝试使用SignalR 2和CORS。这是我的packages.config：

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="jQuery" version="2.1.3" targetFramework="net45" />
  <package id="Microsoft.AspNet.Cors" version="5.2.3" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR" version="2.2.0" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR.Core" version="2.2.0" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR.JS" version="2.2.0" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR.SystemWeb" version="2.2.0" targetFramework="net45" />
  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net45" />
  <package id="Microsoft.Owin.Cors" version="3.0.1" targetFramework="net45" />
  <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net45" />
  <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net45" />
  <package id="Newtonsoft.Json" version="6.0.8" targetFramework="net45" />
  <package id="Owin" version="1.0" targetFramework="net45" />
</packages>

My OwinStartup类在appsettings中的web.config中定义如下：

<add key="owin:AppStartup" value="SignalRStartup, App_Code" />

这就是班级的样子：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Owin;
using Microsoft.Owin;
using Microsoft.AspNet.SignalR;
using Microsoft.Owin.Cors;
using System.IO;

[assembly: OwinStartup(typeof(SignalRStartup))]
public class SignalRStartup
{
    public void Configuration(IAppBuilder app)
    {

        // Enable detailed errors (remember to remove it
        var hubConfiguration = new HubConfiguration();
        hubConfiguration.EnableDetailedErrors = true;
        //hubConfiguration.EnableCrossDomain = true;
        app.UseCors(CorsOptions.AllowAll);
        app.MapSignalR(hubConfiguration);
    }
}

另请注意，我无法使用app.Map("/signalr", map => { ... }); ...

编辑：我在web.config中找到了那些在升级之前我没有的行：

<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.1.0.0" newVersion="3.0.1.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Cors" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Owin.Security" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

我即将放弃，如果您有任何想法，请...

Answer 1

耶！找到了！非常感谢这篇文章： The type or namespace IAppBuilder could not be found(missing using a directive pr an assembly reference)

我的问题已通过重新安装Microsoft.owin解决，如Иво Недев建议：

PM> Update-Package Microsoft.Owin -Reinstall
Removing 'Microsoft.Owin 3.0.1' from ww.
Value does not fall within the expected range.
Successfully removed 'Microsoft.Owin 3.0.1' from ww.
Removing 'Owin 1.0' from ww.
Successfully removed 'Owin 1.0' from ww.
Uninstalling 'Microsoft.Owin 3.0.1'.
Successfully uninstalled 'Microsoft.Owin 3.0.1'.
Uninstalling 'Owin 1.0'.
Successfully uninstalled 'Owin 1.0'.
Attempting to resolve dependency 'Owin (≥ 1.0)'.
Installing 'Owin 1.0'.
Successfully installed 'Owin 1.0'.
Installing 'Microsoft.Owin 3.0.1'.
You are downloading Microsoft.Owin from Microsoft, the license agreement to which is available at http://www.microsoft.com/web/webpi/eula/net_library_eula_enu.htm. Check the package for additional dependencies, which may come with their own license agreement(s). Your use of the package and dependencies constitutes your acceptance of their license agreements. If you do not accept the license agreement(s), then delete the relevant components from your device.
Successfully installed 'Microsoft.Owin 3.0.1'.
Adding 'Owin 1.0' to ww.
Successfully added 'Owin 1.0' to ww.
Adding 'Microsoft.Owin 3.0.1' to ww.
Successfully added 'Microsoft.Owin 3.0.1' to ww.

我的脑袋现在可以止血了:-P

OWinStartup，OWinStartupAttribute not found＆amp; ＆＃39; Owin.IAppBuilder＆＃39;不包含＆＃39; Map＆＃39;的定义

1 个答案: