CODEWITHSUNDEEP
c#winformsdatagridview
Jason D
Jason D

Reputation: 2664

DataGridView and Locating Data

I am using a DataGridView to keep track of a List<myObject>. To populate it, I use this foreach loop:

foreach (myObject object in myList)
{
    if (object.Status == Status.Available)
    {
        myDataGridView.Rows.Add(object.Name, object.Status.ToString());
    }
}

I then use an event to create a new form for the object in the selected row:

void myDataGridView_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
    var index = myList[myDataGridView.CurrentRow.Index];
    myForm form = new myForm(index);
}

So this works just fine until the status of an item in the list changes:

myList[10].Status = Status.Unavailable;

Now when myDataGridView is updated, I can no longer use the row index to open the correct form for any row past 10. I'm at a loss as to what to do.

Can anybody tell me how to open the correct form even though the indices don't match up anymore?

EDIT: myList holds characters in a game, some who are available for hire and some who aren't. I need myDataGridView to only be populated with those whose status is Available.

Upvotes: 0

Views: 51

Answers (3)

Eric W
Eric W

Reputation: 570

Somehow you have to associate the index in your list with the row. One way you could do this is to have a hidden column in your grid that maintains the mapping between a row and the correct list index. To add a hidden column, modify your insert code as follows:

int i = 0;
foreach (myObject object in myList)
{
     if (object.Status == Status.Available)
     {
         myDataGridView.Rows.Add(object.Name, object.Status.ToString(), i);
     }

     i++;
}

//Hide the third column
myDataGridView.Columns[2].Visible = false;

Then during the CellDoubleClick event you can reference this hidden column to get the true index of the item in this row.

void myDataGridView_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
    int listIndex = (int)myDataGridView.CurrentRow.Cells[2].Value;

    var index = myList[listIndex];

    myForm form = new myForm(index);
}

Upvotes: 0

Jason D
Jason D

Reputation: 2664

By modifying alabamasux' answer, I managed to get it working.

var index = myList[(int)myDataGridView.CurrentRow.Cells[2].Value];
myForm form = new myForm(index);

Upvotes: 1

AAlferez
AAlferez

Reputation: 1502

I dont really see why doing it this way, when you can populate the gridview directly with the list you want with:

class TestObject { public string Code { get; set; } public string Text { get; set; } }

void PopulateGrid()
{
    TestObject test1 = new TestObject()
    {
    Code = "code 1",
    Text = "text 1"
    };
    TestObject test2 = new TestObject()
   {
    Code = "code 2",
    Text = "text 2"
    };
    List<TestObject> list = new List<TestObject>();
    list.Add(test1);
    list.Add(test2);

    dataGridView1.DataSource = list; //THIS IS WHAT SHOULD DO IT
}

Upvotes: 0

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