单击按钮时 asp.net 中的 Sharepoint 集合尚未初始化 - C# asp.net

Question

我是 Sharepoint 的新手，在参考 url - Access SharePoint online using client object model- Forbidden error 后，我成功连接到 Sharepoint 并在控制台应用程序 C# 中检索详细信息。我的问题是当我将相同的代码移动到 asp.net 网站时，它给我 Collection has not been initialized 错误。这是代码

using (ClientContext clientContext = new ClientContext("https://.../sites/.../"))
        {
            SecureString passWord = new SecureString();

            foreach (char c in "abcdefghijklmnop".ToCharArray()) passWord.AppendChar(c);
            clientContext.Credentials = new SharePointOnlineCredentials("myname@mydomain.com", passWord);
            List list = clientContext.Web.Lists.GetByTitle("ABC DEF");
            CamlQuery camlQuery = new CamlQuery();
            camlQuery.ViewXml = "<View><RowLimit>1200</RowLimit></View>";
            ListItemCollection collListItem = list.GetItems(camlQuery);
            clientContext.Load(collListItem, li => li.Include(
                            pi => pi.Id,
                            pi => pi["Title"],
                            pi => pi["Application"],
                            pi => pi["URL"],
                            pi => pi["AIR_x0020_ID"]

                ));

            clientContext.ExecuteQuery();
            List<string> listofapplications = new List<string>();
            foreach (ListItem oListItem in collListItem)
            {
                { Console.WriteLine(oListItem["Title"] + ", Application " + oListItem["Application"]); }
            }
            Console.ReadLine();
        }

它在 foreach(Listitem oListItem in collListItem) 处给我错误：

An exception of type 'Microsoft.SharePoint.Client.CollectionNotInitializedException' occurred in Microsoft.SharePoint.Client.Runtime.dll but was not handled in user code

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

这里是详细的错误：

Microsoft.SharePoint.Client.CollectionNotInitializedException was unhandled by user code HResult=-2146233079 Message=The collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested.
Source=Microsoft.SharePoint.Client.Runtime StackTrace: at Microsoft.SharePoint.Client.ClientObjectCollection`1.d__0.MoveNext() at Home.btn_Click(Object sender, EventArgs e) in c:\Users\rakesh.a.srivastava\Documents\Visual Studio 2015\WebSites\DNSProvisioningPortal\Home.aspx.cs:line 45 at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException:

请注意，我在控制台应用程序中没有任何问题，但 asp.net 按钮单击操作。我也添加了客户端和 Client.Runtime 引用！我无法理解为什么它在控制台中有效但在网站中无效。我是否缺少任何名称空间，参考？我已经引用了这些 URL , Sharepoint field has not been initialized in C#, ，但没有任何关于我的问题的信息。请帮忙。谢谢

Answer 1

根据我的测试，有些时候我们可以忽略aspnet项目中的异常。（对于您的代码，您需要将 ["XXX"] 替换为 Client_XXX）

准备

通过 NuGet 包管理器将 Microsoft.SharePointOnline.CSOM 安装到项目中。

我的测试代码：首先是扩展方法（可选）

public static class CSOMExtensions
    {
        public static Task ExecuteQueryAsync(this ClientContext clientContext)
        {
            return Task.Factory.StartNew(() =>
            {
                clientContext.ExecuteQuery();
            });
        }
    }

用我的 post 替换一些代码：

 List list = clientContext.Web.Lists.GetByTitle("CustomList1");
 CamlQuery camlQuery = new CamlQuery();
 camlQuery.ViewXml = "<View><RowLimit>1200</RowLimit></View>";
 ListItemCollection collListItem = list.GetItems(camlQuery);

 clientContext.Load(collListItem, li => li.Include( 
                        pi => pi.Client_Title
                      //pi => pi["Application"],
                      // pi => pi["AIR_x0020_ID"]
            ));

//clientContext.ExecuteQueryAsync();

Task t2 = clientContext.ExecuteQueryAsync();

await t2.ContinueWith((t) =>
{
   foreach (ListItem oListItem in collListItem)
   {
     System.Diagnostics.Debug.WriteLine(oListItem.Client_Title); 
   }
});

如果我们直接使用 ["Title"]，它会在 aspnet 中崩溃，但 Client_XXX 不会在我这边。

我没有深入研究原因，也没有尝试自定义字段。有时间我再研究一下

单击按钮时 asp.net 中的 Sharepoint 集合尚未初始化 - C# asp.net

Sharepoint collection has not been initialized in asp.net on button click - C# asp.net

c#

asp.net

sharepoint

office365

sharepoint-online