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DataGridViewRowsAddedEventArgs Class

Note: This class is new in the .NET Framework version 2.0.

Provides data for the RowsAdded event.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public class DataGridViewRowsAddedEventArgs : EventArgs
public class DataGridViewRowsAddedEventArgs extends EventArgs
public class DataGridViewRowsAddedEventArgs extends EventArgs

The RowsAdded event occurs when rows are added to a DataGridView control. When the user adds a new row using the row for new records, the RowIndex value in the handler for this event is equal to the index of the new location of the row for new records, which is one greater than the row just added. When you add rows programmatically, however, the RowIndex value is the index of the first row added.

For more information about handling events, see Consuming Events.

The following code example handles the RowsAdded event to increment the number of rows in a virtual DataGridView. The number of rows is used in the CellValueNeeded handler so it knows when to show a blank cell versus an initialized cell for a new row. This example is part of a larger example available in the VirtualMode reference topic.

bool newRowNeeded;
private void dataGridView1_NewRowNeeded(object sender,
    DataGridViewRowEventArgs e)
{
    newRowNeeded = true;
}

const int initialSize = 5000000;
int numberOfRows = initialSize;

private void dataGridView1_RowsAdded(object sender,
     DataGridViewRowsAddedEventArgs e)
{
    if (newRowNeeded)
    {
        newRowNeeded = false;
        numberOfRows = numberOfRows + 1;
    }
}

#region "data store maintance"
const int initialValue = -1;

private void dataGridView1_CellValueNeeded(object sender,
    DataGridViewCellValueEventArgs e)
{
    if (store.ContainsKey(e.RowIndex))
    {
        // Use the store if the e value has been modified 
        // and stored.            
        e.Value = store[e.RowIndex];
    }
    else if (newRowNeeded && e.RowIndex == numberOfRows)
    {
        if (dataGridView1.IsCurrentCellInEditMode)
        {
            e.Value = initialValue;
        }
        else
        {
            // Show a blank value if the cursor is just resting
            // on the last row.
            e.Value = String.Empty;
        }
    }
    else
    {
        e.Value = e.RowIndex;
    }
}

private void dataGridView1_CellValuePushed(object sender,
    DataGridViewCellValueEventArgs e)
{
    store.Add(e.RowIndex, int.Parse(e.Value.ToString()));
}
#endregion

private Dictionary<int, int> store = new Dictionary<int, int>();

private boolean newRowNeeded;

private void dataGridView1_NewRowNeeded(Object sender,
    DataGridViewRowEventArgs e)
{
    newRowNeeded = true;
} //dataGridView1_NewRowNeeded

private final int INITIALSIZE = 5000000;
private int numberOfRows = INITIALSIZE;

private void dataGridView1_RowsAdded(Object sender,
    DataGridViewRowsAddedEventArgs e)
{
    if (newRowNeeded) {
        newRowNeeded = false;
        numberOfRows = numberOfRows + 1;
    }
} //dataGridView1_RowsAdded

#region "data store maintance"
private final int INITIALVALUE = -1;

private void dataGridView1_CellValueNeeded(Object sender,
    DataGridViewCellValueEventArgs e)
{
    if (store.ContainsKey(e.get_RowIndex())) {
        // Use the store if the e value has been modified 
        // and stored.            
        e.set_Value((Int32)store.get_Item(e.get_RowIndex()));
    }
    else {
        if (newRowNeeded && e.get_RowIndex() == numberOfRows) {
            if (dataGridView1.get_IsCurrentCellInEditMode()) {
                e.set_Value((Int32)INITIALVALUE);
            }
            else {
                // Show a blank e if the cursor is just loitering
                // over(the)
                // last row.
                e.set_Value("");
            }
        }
        else {
            e.set_Value((Int32)e.get_RowIndex());
        }
    }
} //dataGridView1_CellValueNeeded

private void dataGridView1_CellValuePushed(Object sender,
    DataGridViewCellValueEventArgs e)
{
    store.Add(e.get_RowIndex(), Int32.Parse(e.get_Value().ToString()));
} //dataGridView1_CellValuePushed
#endregion

private Dictionary<int, int> store = new Dictionary<int, int>();

System.Object
   System.EventArgs
    System.Windows.Forms.DataGridViewRowsAddedEventArgs
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0
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