[英]add new item with existing item in listview C#
我的listView中已經存在一些項目。 頁面上有一個添加按鈕,可打開一個對話框,用戶可以在其中添加新項目。 對話框關閉后,我必須將該新項目附加到已經存在的項目中。 這是代碼,直到結束,但未添加新項目。 我在列表視圖中有多個列。我在這做錯了什么。
public frmEditObject(AddException ObjException)
{
InitializeComponent();
if (ObjException != null)
{
ListViewItem lviMember, lviSender = null;
bool alreadyExists =
exceptionsList.Find(
item =>
item.UserDetail == ObjException.UserDetail && item.ExceptionType != ObjException.ExceptionType) !=
null
? true
: false;
if (!alreadyExists)
{
exceptionsList.Add(ObjException);
lvwExceptionMember.Items.Clear();
lvwExceptionMember.BeginUpdate();
foreach (var item in exceptionsList)
{
if (item.ExceptionType == Enumerations.ExceptionType.Members)
{
lviMember = new ListViewItem(
item.UserDetail);
lviMember.Tag = 0;
lviMember.SubItems.Add(GetDisplayNameFromSamAccountName(item.UserDetail));
lvwExceptionMember.Items.Add(lviMember);
}
}
lvwExceptionMember.EndUpdate();
lvwExceptionMember.Refresh();
}
}
}
跟着這些步驟:
public frmEditObject(AddException ObjException)
{
InitializeComponent();
//CHECK THAT YOUR OBJECT IS ALIVE
if (ObjException != null)
{
ListViewItem lviMember, lviSender = null;
bool alreadyExists = exceptionsList.Find(item => item.UserDetail == ObjException.UserDetail && item.ExceptionType != ObjException.ExceptionType) != null ? true : false;
if (!alreadyExists)
{
//CHECK THAT NEW ITEM IS REALLY NEW, DOES NOT EXIST IN LIST
exceptionsList.Add(ObjException);
//YOU DO NOT NEED TO CLEAR LIST AND ADD ALL ITEMS TO IT
//lvwExceptionMember.Items.Clear();
//lvwExceptionMember.BeginUpdate();
Debug.WriteLine(item.ExceptionType);
if (item.ExceptionType == Enumerations.ExceptionType.Members)
{
//CHECK DOES YOUR OBJECT HAVE MEMBERS TYPE
lviMember = new ListViewItem(item.UserDetail);
lviMember.Tag = 0;
lviMember.SubItems.Add(GetDisplayNameFromSamAccountName(item.UserDetail));
lvwExceptionMember.Items.Add(lviMember);
}
// lvwExceptionMember.EndUpdate();
//lvwExceptionMember.Refresh();
}
}
}
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