How can I check for an item in a DataGridViewComboBoxColumn without using an object?

Question

I need to check and see if a certain value is present in a DataGridViewComboBoxColumn. The issue is that DataGridViewComboBoxColumn.Items.Contains() wants an object and I am giving it a long value. Is there a method/way I can get a string/long value of the Items?

This is what my logic looks like right now (pseudo code).

if (DataGridViewComboBoxColumn.Items.Contains(long))
{
     //Do Stuff
}

Reza Aghaei · Accepted Answer · 2015-09-10T15:34:38.610

4

There are many ways to do that, this simple and beautiful way will do the trick for you:

String:

yourDataGridViewComboBoxColumn.Items.Cast<string>().Contains("your string value")

Long:

yourDataGridViewComboBoxColumn.Items.Cast<long>().Contains(yourLongValue)

Complex Object:

If Items in your combo box column are complex, you should do it ths way:

 yourDataGridViewComboBoxColumn.Items.Cast<YourComplexType>()
    .Select(x => x.YourValueMemberField)
    .Contains(yourLongValue);

For example if items are of type Category and category has Id and Name and you used its Id as ValueMember, you can use code like this:

 int value=10;
 yourDataGridViewComboBoxColumn.Items.Cast<Category>()
    .Select(x => x.Id)
    .Contains(value);

The key point here is using Cast<T> that helps you to cast all items to desired type.

This way you can even search in items using Where() after Cast<T>()

edited Sep 10 '15 at 15:34

answered Sep 10 '15 at 15:05

Reza Aghaei

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I tried the "Long" version but I just got an "InvalidCastException". – Programmer Sep 10 '15 at 15:13
This is because probably all items are not long – Reza Aghaei Sep 10 '15 at 15:14
What is the type of items in it? – Reza Aghaei Sep 10 '15 at 15:14
I have a List that I am running through in the Contains() portion – Programmer Sep 10 '15 at 15:15
What is the type of items in your DatagridviewComboBoxColumn – Reza Aghaei Sep 10 '15 at 15:16
Each item has a long value (an id) and a string value (a name) – Programmer Sep 10 '15 at 15:18
It's different, I'll update the answer for you in a minute – Reza Aghaei Sep 10 '15 at 15:21
1

@Hooplehead24 use `Cast` and `Select(x=>(long)x["YourValueMemberColumn"])` – Reza Aghaei Sep 10 '15 at 15:56
@Hooplehead24 x refers to element of list, each element of output of `Cast`. - It is Linq – Reza Aghaei Sep 10 '15 at 15:58

score 0 · Answer 2 · answered Sep 10 '15 at 15:06

0

    DataGridViewComboBoxCell cell = dataGridView1.Rows[0].Cells[0] as DataGridViewComboBoxCell;
    long value = 3434232;
    if (cell.Items.Contains(value)) MessageBox.Show("Yes");

answered Sep 10 '15 at 15:06

Posting code is useful, but for educational purposes it's good to also include some explanation of how it solves the issue. – neontapir Sep 10 '15 at 16:58

How can I check for an item in a DataGridViewComboBoxColumn without using an object?

2 Answers2