仔细一看，SSO返回的ticket也不相同，才发现原来IIS重启了，最后解决方案如下：

新建一个类继承IHttpModule

复制代码 代码如下:

/// <summary>

/// Stops the ASP.NET AppDomain being restarted (which clears

/// Session state, Cache etc.) whenever a folder is deleted.

/// </summary>

public class StopAppDomainRestartOnFolderDeleteModule : IHttpModule

{

private static bool DisableFCNs = false;

public void Init(HttpApplication context)

{

if (DisableFCNs) return;

PropertyInfo p = typeof(HttpRuntime).GetProperty("FileChangesMonitor", BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);

object o = p.GetValue(null, null);

FieldInfo f = o.GetType().GetField("_dirMonSubdirs", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.IgnoreCase);

object monitor = f.GetValue(o);

MethodInfo m = monitor.GetType().GetMethod("StopMonitoring", BindingFlags.Instance | BindingFlags.NonPublic);

m.Invoke(monitor, new object[] { });

DisableFCNs = true;

}

public void Dispose() { }

}

随后在Web.Config中加入Module配置

复制代码 代码如下:

<>

<add name="stopAppDomainRestartOnFolderDelete" type="DeployAssistant.Facade.Web.StopAppDomainRestartOnFolderDeleteModule,DeployAssistant.Facade"/>

这样每次再删除文件/文件夹AppDomain都不会重启了，Session也不会丢失了。世界也变得更美好了！

PS：Web.Config和bin文件夹下的改动依然会让Web重启，这也是必须保留的！