更新 Sharepoint 列表项 [英] Update Sharepoint List Item

问题描述

我遇到以下错误...

System.NullReferenceException:未将对象引用设置为对象的实例.在 Microsoft.SharePoint.SPListItem.get_UniqueId()在 ConsoleApplication1.Program.Main(String[] args) in Program.cs:line 21

System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.SharePoint.SPListItem.get_UniqueId() at ConsoleApplication1.Program.Main(String[] args) in Program.cs:line 21

运行以下代码

using (SPSite site = new SPSite("http://site/"))
{    
    using (SPWeb web = site.OpenWeb())
    {
        try
        {
            SPList list = web.Lists["ListName"]; // 2        
            SPListItem item = list.Items.Add();
            Guid itemId = item.UniqueId;
            SPListItem itemUpdate = web.Lists["ListName"].Items[itemId];
            itemUpdate["PercentComplete"] = .45; // 45%        
            itemUpdate.Update();
        }
        catch (Exception e)
        { 
            Console.WriteLine(e);
            Console.ReadLine();

        }
    }
}

有什么问题吗?

推荐答案

如果你想改变刚刚插入的列表项的值，你应该这样做:

If you're trying to alter values for a just inserted list item, you should go with:

SPList list = web.Lists["ListName"];
//SPListItem item = list.Items.Add();
//item["PercentComplete"] = .45; // 45%
//item.Update();

SPListItemCollection items = list.GetItems(new SPQuery()
{
    Query = @"<Where>
                <Eq>
                   <FieldRef Name='Title' />
                   <Value Type='Text'>Desigining</Value>
                </Eq>
              </Where>"
});

foreach (SPListItem item in items)
{
    item["PercentComplete"] = .45; // 45%
    item.Update();
}

如果您需要找到要更新的特定项目，您只需要使用 list.Items[uniqueId] 或更快的 list.GetItemByUniqueId(uniqueId)；使用 SPQuery 类可以完成什么.

You just need to use list.Items[uniqueId] or faster list.GetItemByUniqueId(uniqueId) if you needs to find a particular item to update; what can be accomplished by using SPQuery class.

这篇关于更新 Sharepoint 列表项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！