C# 在C中使用Linq删除sql行

我正在尝试从C到Linq删除sql表记录，但由于某些原因，无法重新组织DeleteonSubmit，我不确定我缺少了什么，请指导我正确的方法

这是我的密码

          proxy = new ServiceClient("basicHttp_IService");
        //GatewayService.ServiceClient proxy = new ServiceClient("basicHttp_IService");

        SearchCriteria criteria = new SearchCriteria();
        criteria.UserRoles = new string[] { "*" };

        var stories = proxy.GetStoryItemsByCriteria(criteria);
        var programs = proxy.GetPrograms();
        var Profiles = proxy.GetProfiles();
foreach(StoryProgram sp in lstStoriestoClose)
{
    try
    {
        DateTime LastUpdateTimestamp;
        DateTime CurrentTime = DateTime.Now;
        LastUpdateTimestamp = sp.Story.LastUpdatedOn;

        if ((CurrentTime - LastUpdateTimestamp).TotalHours > 24)
        {
            //Delete the story from database
            var storytoDelete = from story in stories
                                where story.Id == sp.Story.Id
                                select story;

            //I am trying to delete the record like below
            stories.DeleteonSubmit(storytoDelete);
            stories.SubmitChanges();
            //Intellisense doesn't show the option DeleteonSubmit and SubmitChanges
        }
    }
}

请指导我通过Linq删除SQL中的记录的正确方法DeleteOnSubmit适用于单个实体。您的查询返回一个实体集合，这些实体可能只有一个条目，但它仍然是一个集合。您可以使用DeleteAllOnSubmit：

或显式提取一条记录：

//Delete the story from database
var storytoDelete = from story in stories
                    where story.Id == sp.Story.Id
                    select story;

//I am trying to delete the record like below
stories.DeleteOnSubmit(storytoDelete.Single());  // or First, depending on whether you expect more than one match

---

看起来您的服务返回的是数组，而不是有效的linq数据库对象。这就是为什么它不能识别您期望看到的方法。您需要检查类型并从那里开始

---

您始终可以右键单击服务引用并配置以检查/设置返回类型。

我刚刚在WCF服务中添加了删除功能，并传递sql记录详细信息以从解决我的问题的sql中删除记录

谢谢大家的建议和建议

 foreach(StoryProgram sp in lstStoriestoClose)
        {
            try
            {
                DateTime LastUpdateTimestamp;
                DateTime CurrentTime = DateTime.Now;
                LastUpdateTimestamp = sp.Story.LastUpdatedOn;
                if ((CurrentTime - LastUpdateTimestamp).TotalHours > 24)
                {
                    //Delete the story from database
                    //Check the gateway to delete the record in the db.
                    var storytoDelete= from story in stories
                                        where story.Id== sp.Story.Id
                                        select story;

                   // stories.DeleteAllonSubmit(storytoDelete);
                    List<StoryProgram> lstStoriestoDelete = (from story in storytoDelete
                                                            join program in programs on story.ProgramId equals program.Id
                                                            join profile in Profiles on story.ProfileId equals profile.Id
                                                            select new StoryProgram(story, program, profile)).ToList();
                    foreach (StoryProgram sps in lstStoriestoDelete)
                    {
                        try
                        {
                            proxy.DeleteStoryItem(sps.Story.Id);
                        }

---

如果在分配storytodelete后停止，你看到记录了吗？我没有看到记录，我可以看到在storytodelete列表lstStoriestoDelete=来自storytodelete中的story后添加此代码的记录在story.ProgramId等于program.Id的程序中加入story.ProfileId上的程序中加入程序等于profile.Id选择new Story ProgramStory，program，profile.ToList；我的问题是，它在DeleteonSubmit或DeleteAllonSubmit系统上引发异常。数组不包含DeleteAllonSubmit的定义，并且没有扩展方法DeleteAllonSubmit接受System类型的第一个参数。数组是否缺少using指令或程序集引用请显示正在定义故事的位置，这不应该是一个错误array@aw04，更新了我的op。我打电话给我的wcf服务获取故事谢谢你的评论，现在我的问题是，它在DeleteonSubmit或DeleteAllonSubmit系统上引发异常。数组不包含DeleteAllonSubmit的定义，并且没有扩展方法DeleteAllonSubmit接受System.ArrayEvent类型的第一个参数。我使用System.Linq添加了命名空间；使用System.Data.Sql；C区分大小写。检查您的大小写。intellisense不显示类似于在故事之后删除的选项。好了，现在您添加了更多上下文，我可以看到故事是从代理返回的某种集合。你的代理上有某种类型的Delete方法吗？是的，它肯定返回数组。谢谢你的建议，你建议将集合类型更改为Generic.list吗？不，没有那么简单。您需要与数据库表相关的实际类型。

 foreach(StoryProgram sp in lstStoriestoClose)
        {
            try
            {
                DateTime LastUpdateTimestamp;
                DateTime CurrentTime = DateTime.Now;
                LastUpdateTimestamp = sp.Story.LastUpdatedOn;
                if ((CurrentTime - LastUpdateTimestamp).TotalHours > 24)
                {
                    //Delete the story from database
                    //Check the gateway to delete the record in the db.
                    var storytoDelete= from story in stories
                                        where story.Id== sp.Story.Id
                                        select story;

                   // stories.DeleteAllonSubmit(storytoDelete);
                    List<StoryProgram> lstStoriestoDelete = (from story in storytoDelete
                                                            join program in programs on story.ProgramId equals program.Id
                                                            join profile in Profiles on story.ProfileId equals profile.Id
                                                            select new StoryProgram(story, program, profile)).ToList();
                    foreach (StoryProgram sps in lstStoriestoDelete)
                    {
                        try
                        {
                            proxy.DeleteStoryItem(sps.Story.Id);
                        }