使用linq删除gridview中的行

Question

我写了这段代码来删除Gridview中的行，但它不起作用。

class.cs中的代码：

public bool bDeleteItem(int nItemID)
{ 
    bool flag = false;
    try
    {
        Training_sNairoukhEntities1 sNairoukhEntities1 = new Training_sNairoukhEntities1();
        IMS_Items oIMS_Items = sNairoukhEntities1.IMS_Items.Where(Entity => Entity.ItemID == nItemID).Single();
        sNairoukhEntities1.IMS_Items.Remove(oIMS_Items);
        int nResult = sNairoukhEntities1.SaveChanges();
        if (nResult > 0)
        {
            flag = true;
        }
    }
    catch (Exception ex)
    {
    }
    return flag;
}

Aspx.cs中的代码：

int nId = Convert.ToInt32(gvManageItem.DataKeys[Convert.ToInt32(e.CommandArgument)]["ItemID"].ToString());
if (e.CommandName == "cmDelete")
{
    ManageItem oManageItem = new ManageItem();
    if (oManageItem.bDeleteItem(nId))
    {
        lblValidation.Text = "Delete is successfully";
    }
    else
    {
        lblValidation.Text = "isnt delete";
    }
}

Answer 1

删除方法“将给定实体标记为已删除，以便在调用SaveChanges时将其从数据库中删除。 请注意，在调用此方法之前，实体必须存在于某个其他状态的上下文中 。” 下面的命令将起作用：sNairoukhEntities1.Entry（oIMS_Items）.State = System.Data.Entity.EntityState.Deleted;
sNairoukhEntities1.SaveChanges（）;