按值传递 - 列表名称

Question

有人能告诉我我做错了什么吗？我试图将列表名称传递给将删除列表中所有行的方法：

    public static void DeleteLastUpdate(Microsoft.SharePoint.Client.List oList)
    {
        using (var context = new ClientContext(FrontEndAppUrl))
        {
            var ss = new System.Security.SecureString();
            Array.ForEach("hhh".ToCharArray(), (c) => { ss.AppendChar(c); });
            context.Credentials = new SharePointOnlineCredentials("yyy", ss);
            var web = context.Web;

            ListItemCreationInformation itemCreateInfo = new ListItemCreationInformation();

            CamlQuery camlQuery = new CamlQuery();
            camlQuery.ViewXml = "<View><Query><OrderBy><FieldRef Name='ID' Ascending='TRUE' /></OrderBy></Query></View>";
            ListItemCollection collListItem = oList.GetItems(camlQuery);
            context.Load(collListItem);

            context.ExecuteQuery();



            foreach (ListItem oListItem in collListItem)
            {

                string i = oListItem["ID"].ToString(); ;

                ListItem ListItemToDelete = oList.GetItemById(i);

                ListItemToDelete.DeleteObject();

                context.ExecuteQuery();

            }

            oList.Update();
        }

    }

    public static void GetCountry()
    {
        using (var context = new ClientContext(FrontEndAppUrl))
        {
            Microsoft.SharePoint.Client.List oList_Country = context.Web.Lists.GetByTitle("LISTNAME");

            DeleteLastUpdate(oList_Country);


        }

    }

我得到的错误是在 context.Load(collListItem);

它说该对象在与该对象关联的上下文不同的上下文中使用。我还能如何将列表的值传递给 Delete() 方法？

Answer 1

异常所说的正是正在发生的事情。您在 GetCountry() 的上下文中创建 oList_Country，然后将其传递给您在不同上下文中工作的 DeleteLastUpdate()。

也许您应该考虑通过参数将上下文传递给 DeleteLastUpdate()。那么你的代码就会变成这样：

public static void DeleteLastUpdate(ClientContext context, Microsoft.SharePoint.Client.List oList)
{
    // You should not create a context here, but use the supplied context
    // using (var context = new ClientContext(FrontEndAppUrl))
    // {
        var ss = new System.Security.SecureString();
        ...
}

public static void GetCountry()
{
    using (var context = new ClientContext(FrontEndAppUrl))
    {
        Microsoft.SharePoint.Client.List oList_Country = context.Web.Lists.GetByTitle("LISTNAME");

        DeleteLastUpdate(context, oList_Country);  // Pass the context

Answer 2

我想您可能会尝试在 GetCountry 方法中重用 DeleteLastUpdate 方法中的上下文。顺便说一句 DeleteLastUpdate 执行大量查询看起来效率不高。

按值传递 - 列表名称

Pass by value - List name

c#

asp.net

sharepoint

call-by-value