Asp.net [NullReferenceException:对象引用未设置为对象的实例。]

是我在线部署网站时收到的消息

在本地，一切都正常运行，即使我将所有项目文件复制到另一台计算机上，一切都正常

但是，当我将站点发布到IIS服务器时，会显示如上所示的错误

是否有我可能缺少的设置？ 我怀疑这是一个编码问题，因为一切都在

localhost上完美运行

Default.aspx.cs中的代码：

[NullReferenceException: Object reference not set to an instance of an object.]
   Wictor.Office365.MsOnlineClaimsHelper.getCookieContainer() +128
   Wictor.Office365.MsOnlineClaimsHelper.clientContext_ExecutingWebRequest(Object sender, WebRequestEventArgs e) +33
   Microsoft.SharePoint.Client.ClientContext.EnsureFormDigest() +382
   Microsoft.SharePoint.Client.ClientContext.ExecuteQuery() +16
   Webapplicatie.Default.Page_Load(Object sender, EventArgs e) +334
   System.Web.UI.Control.LoadRecursive() +70
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3177

MsOnlineClaimsHelper的附加代码

  MsOnlineClaimsHelper claimsHelper = new MsOnlineClaimsHelper(sharepointsiteUrl, username, password);
            using (ClientContext context = new ClientContext(sharepointsiteUrl))
            {
                context.ExecutingWebRequest += claimsHelper.clientContext_ExecutingWebRequest;

                context.Load(context.Web);

                context.ExecuteQuery();

                Lebel.Text = "Succesfully logged in as " + username + " on " + context.Web.Title;
            }"

发布时未在服务器上添加Microsoft.EntityModel.dll。
我已经将这个.dll手动放在服务器上，现在它可以工作了

感谢您的帮助，GrantThomas。
它实际上是Microsoft.IdentityModel引用，路径为：

C:\Program Files\Reference Assembly\Microsoft\Windows Identity
Foundation\v3.5\Microsoft.IdentityModel.dll

如果您安装了VS
这里有一些代码，告诉我们您从哪里得到这个错误会很有用。@GrantThomas请参阅第一篇文章，确切的错误在顶部。提前感谢Kay，这会告诉你错误发生的确切位置；这对您来说更容易，因为您在编辑器中有源代码+行计数等。但是
getCookieContainer
中的某些内容是
null
，您正在尝试对其进行处理。Can
getSamlToken（）返回
null
？如果是这样，那么访问cookies.FedAuth将中断-以它为例，检查事物是否为空（即
If（something！=null）
@GrantThomas getSamlToken（）引发此异常
无法加载文件或程序集“Microsoft.IdentityModel，Version=3.5.0.0，Culture=neutral，PublicKeyToken=31bf3856ad364e35”或其依赖项之一。系统找不到指定的文件。
// Method used to add cookies to CSOM
    public void clientContext_ExecutingWebRequest(object sender, WebRequestEventArgs e) {
        e.WebRequestExecutor.WebRequest.CookieContainer = getCookieContainer();
        //e.WebRequestExecutor.WebRequest.UserAgent = userAgent;
    }

    // Creates or loads cached cookie container
    CookieContainer getCookieContainer() {
        if (_cachedCookieContainer == null || DateTime.Now > _expires) {

            // Get the SAML tokens from SPO STS (via MSO STS) using fed auth passive approach
            MsoCookies cookies = getSamlToken();

            if (!string.IsNullOrEmpty(cookies.FedAuth)) {

                // Create cookie collection with the SAML token                    
                _expires = cookies.Expires;
                CookieContainer cc = new CookieContainer();

                // Set the FedAuth cookie
                Cookie samlAuth = new Cookie("FedAuth", cookies.FedAuth) {
                    Expires = cookies.Expires,
                    Path = "/",
                    Secure = cookies.Host.Scheme == "https",
                    HttpOnly = true,
                    Domain = cookies.Host.Host
                };
                cc.Add(samlAuth);


                if (_useRtfa) {
                    // Set the rtFA (sign-out) cookie, added march 2011
                    Cookie rtFa = new Cookie("rtFA", cookies.rtFa) {
                        Expires = cookies.Expires,
                        Path = "/",
                        Secure = cookies.Host.Scheme == "https",
                        HttpOnly = true,
                        Domain = cookies.Host.Host
                    };
                    cc.Add(rtFa);
                }
                _cachedCookieContainer = cc;
                return cc;
            }
            return null;
        }
        return _cachedCookieContainer;
    }

    public CookieContainer CookieContainer {
        get {
            if (_cachedCookieContainer == null || DateTime.Now > _expires) {
                return getCookieContainer();
            }
            return _cachedCookieContainer;
        }
    }