Sharepoint 客户端对象模型属性或字段尚未初始化

Question

我有一个使用 Sharepoint 客户端对象模型管理 Sharepoint 列表的 C# 程序。有时我们会遇到服务器问题，这将阻止程序访问共享点服务器。我正在使用 class 到运行 ExecuteQuery 方法的助手，并有异常处理继续执行，直到没有异常。

       private void ExecuteContextQuery(ref ClientContext siteContext)
    {
        int timeOut = 10000;
        int numberOfConnectionErrors = 0;
        int maxNumberOfRetry = 60;

            while (numberOfConnectionErrors < maxNumberOfRetry)
            {
                try
                {
                    siteContext.ExecuteQuery();
                    break;
                }
                catch (Exception Ex)
                {

                    numberOfConnectionErrors++;
                    Service.applicationLog.WriteLine("Unable to connect to the sharepoint site. Retrying in " + timeOut);
                    Service.applicationLog.WriteLine("Exception " + Ex.Message + " " + Ex.StackTrace);
                    System.Threading.Thread.Sleep(timeOut);
                    if (numberOfConnectionErrors == maxNumberOfRetry)
                    {
                        throw Ex;
                    }

                }
         }

    }

但是我收到一条错误消息

The property or field 'LoginName' has not been initialized.

和

collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested.

错误消息似乎与我调用 Load 方法的方法有关。这是调用上述方法的我的代码示例。

                List sharepointList = siteContext.Web.Lists.GetByTitle(this._listName);
            CamlQuery query = CamlQuery.CreateAllItemsQuery();
            items = sharepointList.GetItems(query);

            siteContext.Load(items);

            //siteContext.ExecuteQuery();
            ExecuteContextQuery(ref siteContext);

是否需要在每次调用 ExecuteQuery 时重新加载站点上下文？这就是我看到上面错误消息的原因吗？

这是我用来获取生成错误的登录 ID 的函数

    public String getLoginIDbyUserId(int userID)
    {
        ClientContext siteContext = getClientContextObject();
        User _getUser = siteContext.Web.SiteUsers.GetById(userID);

        siteContext.Load(_getUser);
        //siteContext.ExecuteQuery();
        ExecuteContextQuery(ref siteContext);

        String loginID = String.Empty;
        String formatedLoginID = String.Empty;
        loginID = _getUser.LoginName;
        if (loginID.Contains('|'))
        {

            formatedLoginID = loginID.Substring(loginID.IndexOf('|') + 1);

        }
        siteContext.Dispose();
        return formatedLoginID;
    }

Answer 1

请在加载用户对象时尝试加载用户的 LoginName 属性。在 excutequery 方法之后，尝试使用 LoginName 属性 of User

siteContext.Load(_getUser, u => u.LoginName);

更改后您的代码应该如下所示

public String getLoginIDbyUserId(int userID)
    {
        ClientContext siteContext = getClientContextObject();
        User _getUser = siteContext.Web.SiteUsers.GetById(userID);

        siteContext.Load(_getUser, u => u.LoginName);
        //siteContext.ExecuteQuery();
        ExecuteContextQuery(ref siteContext);

        String loginID = String.Empty;
        String formatedLoginID = String.Empty;
        loginID = _getUser.LoginName;
        if (loginID.Contains('|'))
        {

            formatedLoginID = loginID.Substring(loginID.IndexOf('|') + 1);

        }
        siteContext.Dispose();
        return formatedLoginID;
    }

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