C# SP2013 CSOM C更新列表

很好，没有错误。但名单没有更新。我做错了什么？

删除最后一个ctx.Loaditems，因为您没有将更新发送到sharepoint，而是重新加载items值

ClientContext ctx = new ClientContext(Site);
ctx.Credentials = new NetworkCredential(userName, passWord, "dmz");               
List list = ctx.Web.Lists.GetByTitle(SpList);
ListItemCollection items = list.GetItems(CamlQuery.CreateAllItemsQuery());
ctx.Load(items); // loading all the fields              
ctx.ExecuteQuery();
foreach (var item in items)
{
    if (((FieldUrlValue)(item["VideoSetExternalLink"])).Url.ToString() != VideoURL)
    {
        ((FieldUrlValue)(item["VideoSetExternalLink"])).Url = vp.VideoURL;
        item.Update(); 
    }
}
ctx.Load(items);
ctx.ExecuteQuery();

---

我通过创建一个FieldUrlValue对象并赋值，然后修改对象，然后将其传递回item，解决了这个问题。例如：FieldUrlValue va=FieldUrlValueitem[VideoSetExternalLink]；va.Url=vp.VideoURL；项目[VideoSetExternalLink]=va；谢谢你的帮助。

ClientContext ctx = new ClientContext(Site);
ctx.Credentials = new NetworkCredential(userName, passWord, "dmz");               
List list = ctx.Web.Lists.GetByTitle(SpList);
ListItemCollection items = list.GetItems(CamlQuery.CreateAllItemsQuery());
ctx.Load(items); // loading all the fields              
ctx.ExecuteQuery();
foreach (var item in items)
{
    if (((FieldUrlValue)(item["VideoSetExternalLink"])).Url.ToString() != VideoURL)
    {
        ((FieldUrlValue)(item["VideoSetExternalLink"])).Url = vp.VideoURL;
        item.Update(); 
    }
}
ctx.ExecuteQuery();

ClientContext ctx = new ClientContext(Site);
ctx.Credentials = new NetworkCredential(userName, passWord, "dmz");               
List list = ctx.Web.Lists.GetByTitle(SpList);
ListItemCollection items = list.GetItems(CamlQuery.CreateAllItemsQuery());
ctx.Load(items); // loading all the fields              
ctx.ExecuteQuery();
foreach (var item in items)
{
    if (((FieldUrlValue)(item["VideoSetExternalLink"])).Url.ToString() != VideoURL)
    {
        FieldUrlValue va = ((FieldUrlValue)(item["VideoSetExternalLink"]));
        va.Url = vp.VideoURL;
        item["VideoSetExternalLink"] = va;
        item.Update(); 
    }
}
ctx.Load(items);
ctx.ExecuteQuery();

This is how i Fixed the issue.