如何在实体框架中从我的数据库中删除我的问题 [英] How Do I Solve My Problem In Deleting From My Database In Entity Framework

问题描述

我正在使用visual studio 2012和实体框架开发内容管理系统。

我运行这部分：

im working on a content management system with visual studio 2012 and entity framework.
as i run this part:

protected void grdResults_RowDeleting(object sender, GridViewDeleteEventArgs e)
{

    int w = int.Parse(grdResults.Rows[e.RowIndex].Cells[0].Text);
    NewsDbModel.NewsDbEntities db = new NewsDbModel.NewsDbEntities();
   
    var x = (from NewsTable in db.Tables where NewsTable.Id == w select NewsTable);
    db.DeleteObject(x); 
      
    db.SaveChanges();

}

i面临此错误：

无法删除对象，因为在ObjectStateManager中找不到该对象。



请帮我解决这个问题。

非常感谢

i face this error:
"The object cannot be deleted because it was not found in the ObjectStateManager."

pls help me in solving this problem.
thanks alot

推荐答案

好吧，你试图删除两次相同的对象。这应该是一个问题。

还要为你的 x 变量添加一个检查，以便它实际上包含一个值。

Well, you try to delete the same object twice. That should be an issue.
Also add a check for your x variable so it actually contains a value.

protected void grdResults_RowDeleting(object sender, GridViewDeleteEventArgs e)
{

    int w = int.Parse(grdResults.Rows[e.RowIndex].Cells[0].Text);
    NewsDbModel.NewsDbEntities db = new NewsDbModel.NewsDbEntities();

    var x = (from NewsTable in db.Tables where NewsTable.Id == w select NewsTable);
    if (x != null)    // Set a break point here and debug.
        db.DeleteObject(x);
    db.DeleteObject(x);

    db.SaveChanges();

}

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