[英]Delete row in gridview using linq
我寫了這段代碼來刪除Gridview中的行,但它不起作用。
class.cs中的代碼:
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中的代碼:
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";
}
}
刪除方法“將給定實體標記為已刪除,以便在調用SaveChanges時將其從數據庫中刪除。 請注意,在調用此方法之前,實體必須存在於某個其他狀態的上下文中 。” 下面的命令將起作用:sNairoukhEntities1.Entry(oIMS_Items).State = System.Data.Entity.EntityState.Deleted;
sNairoukhEntities1.SaveChanges();
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