Question

我正在尝试读取SharePoint自定义列表中特定字段的值。

自定义列表包含以下字段：Field1，Field2和Field3

当我拨打以下代码时：

public static string GetLastTargetColumnValue(string sharePointSiteUrl, string sharePointListName, string targetColumnName)
        {
            string targetColumnValue = string.Empty;
            using (var clientContext = new ClientContext(sharePointSiteUrl))
            {
                clientContext.Credentials = new NetworkCredential("userName", "password");
                var list = clientContext.Web.Lists.GetByTitle(sharePointListName);
                var query = CamlQuery.CreateAllItemsQuery(100);
                var items = list.GetItems(query); 
                clientContext.Load(items);
                clientContext.ExecuteQuery();
                var listItem = items.Last();
                foreach (var fieldValue in listItem.FieldValues)
                {
                    Console.WriteLine(fieldValue.Key + ":" + fieldValue.Value + Environment.NewLine);
                }
            }
            targetColumnValue = listItem[targetColumnName] as string;
            return targetColumnValue;
        }

错误消息是： 其他信息：属性或字段尚未初始化。尚未请求或请求尚未执行。可能需要明确请求。

foreach中显示的字段显示＆＃34; Field1＆＃34;和＆＃34; Field2＆＃34;。我是否必须明确要求＆＃34; Field3＆＃34;。如果是的话怎么样？

Answer 1

出于某种原因，我必须在查询值之前获取内部名称。以下是有效的代码：

public static string GetLastTargetColumnValue(string sharePointSiteUrl, string sharePointListName, string targetColumnName)
        {
            string targetColumnValue = string.Empty;
            using (var clientContext = new ClientContext(sharePointSiteUrl))
            {
                clientContext.Credentials = new NetworkCredential("userName", "password");
                var list = clientContext.Web.Lists.GetByTitle(sharePointListName);

                var field = list.Fields.GetByInternalNameOrTitle(targetColumnName);
                var textField = clientContext.CastTo<FieldText>(field);

                var query = CamlQuery.CreateAllItemsQuery(100);
                var items = list.GetItems(query);

                clientContext.Load(textField);
                clientContext.Load(items);
                clientContext.ExecuteQuery();

                var listItem = items.Last();
                targetColumnValue = listItem[textField.InternalName] as string;
            }
            return targetColumnValue;
        }

从SharePoint自定义列表中读取现有字段值失败

1 个答案: