Question

我正在尝试使用C＃中的客户端对象模型更新Sharepoint Discussion板中的字段。当代码到达clientContext.ExecuteQuery()时，它会抛出异常：

Invalid data has been used to update the list item. The field you are trying to update may be read only.

以下是代码的一部分：

foreach (var field in newItemProperties)
{
    if (field.Key.Equals("ContentType"))
        continue;

    if (ctFields == null)
        spItem[field.Key] = field.Value;

    else
    {
        bool foundField = false;
        foreach (var fieldCT in ctFields)
        {
            fieldCT.ReadOnlyField=false;
            if (fieldCT.InternalName == field.Key)
            {
                foundField = true;
                if (isAllDayEvent)
                {
                    if (field.Key == "EventDate")
                    {
                        // For all day event, Add 10 hour in order to prevent the EventDate to be decreased by 1 day
                        var dateVal = (DateTime)field.Value;
                        // spItem[field.Key] = dateVal.Add(new TimeSpan(0, 10, 0, 0, 0));
                    }
                    else if (field.Key == "EndDate")
                    {
                        // For all day event, Subtract 10 hour in order to prevent the EndDate to be increased by 1 day
                        var dt = (DateTime)field.Value;
                        // spItem[field.Key] = dt.Subtract(new TimeSpan(0, 10, 0, 0, 0));
                    }
                    else
                        spItem[field.Key] = field.Value;

                }
                else
                    spItem[field.Key] = field.Value;

                break;
            }
        }

        if (!foundField)
        {
            // Update the item properties values even its not part of CT
            // MM hidden fields are not part of CT fields
            if (isAllDayEvent)
            {
                if (field.Key == "EventDate")
                {
                    // For all day event, Add 10 hour in order to prevent the EventDate to be decreased by 1 day
                    var dateVal = (DateTime)field.Value;
                    //spItem[field.Key] = dateVal.Add(new TimeSpan(0, 10, 0, 0, 0));
                }
                else if (field.Key == "EndDate")
                {
                    // For all day event, Subtract 10 hour in order to prevent the EndDate to be increased by 1 day
                    var dt = (DateTime)field.Value;
                    //spItem[field.Key] = dt.Subtract(new TimeSpan(0, 10, 0, 0, 0));
                }
                else
                    spItem[field.Key] = field.Value;

            }
            else
                spItem[field.Key] = field.Value;
        }
    }
}

spItem.Update();            
clientContext.ExecuteQuery();

Answer 1

我在这里给出答案，以防人们通过Google搜索此SO问题标题中的错误消息来查找此问题。这个答案可能会帮助那些遇到这个奇怪错误信息的人。

当我使用服务器端代码更新日历事件时，我遇到了同样的错误。

我的代码首先添加了一个新的空列表项。此新列表项具有开始日期和结束日期的默认值。几行后，列表项字段逐个更新（类似于操作码），然后调用列表项update。在我的情况下，我的代码没有更新开始日期并保持默认值。结束日期由我的代码更新，结束日期早于默认开始日期。当列表项update被触发时，此错误将显示在我的异常日志中。

我更正了此问题并将开始日期调整为之前结束日期，然后致电update，错误就消失了。

Answer 2

请尝试以下方法：

Microsoft.SharePoint.Client.CamlQuery caml = new Microsoft.SharePoint.Client.CamlQuery();

caml.ViewXml = @"<View><Query><Where><Eq><FieldRef Name='FileLeafRef'/><Value Type='File'>" + itemname+ "</Value></Eq></Where></Query></View>";



caml.FolderServerRelativeUrl = relativepath;



Microsoft.SharePoint.Client.ListItemCollection items = list.GetItems(caml);


clientContext.Load(items);

clientContext.Credentials = new NetworkCredential("username","password","domain");


clientContext.ExecuteQuery();


if (items.Count > 0){item["attribute"]=value;}

“无效数据已用于更新列表项。您尝试更新的字段可能只读。“

2 个答案: