CODEWITHSUNDEEP
c#winformsdatagridview
Reeggiie
Reeggiie

Reputation: 822

DataGridView Auto Height - How to AutoSize DataGridView Height?

I am trying to make the height of my DataGridView AutoSize based on the amount of rows it contains. Currently, I was able to accomplish this with the following line:

dataGridView_SearchResults.AutoSize = true;

However this makes the Horizontal scroll bar disappear, the the DataGridView gets cut off.

How can I autosize the height without losing the horizontal scroll bar?

Upvotes: 3

Views: 7393

Answers (3)

isx
isx

Reputation: 101

I modified answer of Jesus by

DGV.Height = DGV.Rows.GetRowsHeight(DataGridViewElementStates.Visible) + DGV.ColumnHeadersHeight;

I don`t use scroll bar, but you can add it from Jesus answer

Upvotes: 1

Jesús Trujillo
Jesús Trujillo

Reputation: 21

I tried every option proposed by Reza Aghaei using .NET Framework 4.7.2. All the times I got an extra space between the last row and the DataGridView bottom border. So I tried a different approach, and it works! Using the event you prefer, write the following line:

dataGridView1.Height = DataGridView1.Rows.GetRowsHeight(DataGridViewElementStates.Visible)
   + (dataGridView1.ScrollBars.HasFlag(ScrollBars.Horizontal) ? SystemInformation.HorizontalScrollBarHeight : 0)
   + 3;

You'd change the last +3 according to the style of your choice. Just change it from +1 to +5 depending of your likes.

Upvotes: 2

Reza Aghaei
Reza Aghaei

Reputation: 125197

Option 1 - Overriding GetPreferredSize

You can override GetPreferredSize method of DataGridView and call the base method using new proposed size new Size(this.Width, proposedSize.Height). This way, the current width of control will remain untouched while the auto-size rules will apply on its height:

using System.Drawing;
using System.Windows.Forms;
public class MyDataGridView : DataGridView
{
    public override Size GetPreferredSize(Size proposedSize)
    {
        return base.GetPreferredSize(new Size(this.Width, proposedSize.Height));
    }
}

Option 2 - Setting the Height based on Height of Calculated Auto-Size

If you don't want to derive from DataGridView, you can calculate the auto-size by calling its GetPreferredSize passing new Size(0, 0) then set the height of DataGridView to the height of result, this way you only change the height of DataGridView. You should set the auto-height in RowsAdded, RowsRemoved, some other events if you need: 

void AutoHeightGrid(DataGridView grid)
{
    var proposedSize = grid.GetPreferredSize(new Size(0, 0));
    grid.Height = proposedSize.Height;
}
private void Form1_Load(object sender, EventArgs e)
{
    dataGridView1.RowsAdded += (obj, arg) => AutoHeightGrid(dataGridView1);
    dataGridView1.RowsRemoved += (obj, arg) => AutoHeightGrid(dataGridView1);
    //Set data source
    //dataGridView1.DataSource = something;
}

If you want to make sure that all changes in grid including changing Font, height of rows will cause resizing grid, you can call the method in Paint event.

Option 3 - Setting MaximumSize

Also as mentioned by Hans, if you don't want to derive from DataGridView, you can use MaximumSize property of the grid. You can set it to new Size(this.dataGridView1.Width, 0):

dataGridView1.MaximumSize = new Size(this.dataGridView1.Width, 0);
dataGridView1.AutoSize = true;

Note

Since using MaximumSize is not so friendly when the user wants to let the grid width change by left and right anchors, I prefer to use Option 1 or Option 2.

Upvotes: 5

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