DataGridView ID 列不会隐藏

Question

I have a DataGridView bound to an ObjectDataSource some of the columns are hidden including the ID column. The problem is that the ID column shows up even when its visible property is set to false. Has anyone run into this problem before? Setting the width to zero is not an option since the grid doesn't allow columns with a width less than 5 pixels wide so it still shows the column on the grid no matter what.

The strange thing is that the ID column wasn't always showing. After I worked on the app for a bit the columns appeared again.

DataGridView is not set to auto generate columns. I am building to version 4.0 of .NET and C#.

Here is the code in the form constructor.

dgvActiveMiners.AutoGenerateColumns = false;
dgvAvilableMiners.AutoGenerateColumns = false;
dgvOperationResults.AutoGenerateColumns = false;

dgvActiveMiners.Columns["dgvActiveMinersRecordId"].Visible = false;
dgvAvilableMiners.Columns["dgvAvilableMinersRecordId"].Visible = false;
dgvOperationResults.Columns["dgvOperationResultRecordId"].Visible = false;

This is the generated code for the grids.

this.dgvOperationResults.AllowUserToAddRows = false;
this.dgvOperationResults.AllowUserToDeleteRows = false;
this.dgvOperationResults.AutoGenerateColumns = false;
this.dgvOperationResults.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.dgvOperationResults.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
this.dgvOperationResultRecordId,
this.nameDataGridViewTextBoxColumn2,
this.typeIdDataGridViewTextBoxColumn,
this.amountDataGridViewTextBoxColumn,
this.operationIdDataGridViewTextBoxColumn});
this.dgvOperationResults.DataSource = this.operationResultBindingSource;
this.dgvOperationResults.Location = new System.Drawing.Point(12, 40);
this.dgvOperationResults.MultiSelect = false;
this.dgvOperationResults.Name = "dgvOperationResults";
this.dgvOperationResults.ReadOnly = true;
this.dgvOperationResults.Size = new System.Drawing.Size(498, 247);
this.dgvOperationResults.TabIndex = 16;

I don't know what else I could be missing?

Thanks!

Answer 1

Suggestion 1:
Try explicitly setting the DGV Column's Visible property to false in the FormLoad event:

dataGridView.Columns["YourIdColumn"].Visible = false;

Suggestion 2:
Try changing your column dgvActiveMinersRecordId from the first column in the DGV to the last column.

Answer 2

To try and answer this a bit more generically for the next person who comes along, like me...

This does seem to be a bug, but the work around is to:

Make sure the columns you want to hide are displayed last

This will depend on your code, but for some this will be:

• SQL code changed to return the columns later
• Change the code that adds the datagridview columns putting the "to hide" columns at the end
• Setting the Columns[x].DisplayIndex such that the columns appear last, as per @Steve's post

Answer 3

I have the same issue.

The following line, still leaves the column visible, even though exploring the value shows it false.

dataSelected.Columns["id"].Visible = false;

I didn't have this issue, until I had set the DisplayIndex on a column

dataSelected.Columns["ipagenum"].DisplayIndex = 6;

Moving the offending columns DisplayIndex to the end, corrected this issue.

dataSelected.Columns["id"].DisplayIndex = 15;

Answer 4

Maybe a bit late but I was beating myself up with the same problem, I had two separate forms with DataGridViews both bound to different DataTables. One had no problem hiding the 1st column, on the other everything I tried didn't work, until ...

Note: ["newCol"] is the first (ie column 0) column in the data table.

This code Fails to hide column [0] (or by name ["NewRow"])

...
MyDataGridView.DataSource = MyDatatable;
MyDataGridView.Columns["NewRow"].Visible = false;   // doesn't hide (col 0)
// MyDataGridView.Columns[0].Visible = false;  <<<< this didn't work either
MyDataGridView.Columns["Changed"].Visible = false;
MyDataGridView.Columns["Active"].Visible = false;
MyDatatable.RowFilter = "[Active] = 1";
...

this code works :

...
MyDataGridView.DataSource = MyDatatable;
MyDatatable.RowFilter = "[Active] = 1";
MyDataGridView.Columns["NewRow"].Visible = false;   // YAY!! Now it hides
// MyDataGridView.Columns[0].Visible = false;       <<<< and this works too
MyDataGridView.Columns["Changed"].Visible = false;
MyDataGridView.Columns["Active"].Visible = false;
...

Spot the difference? It's Where I specify the RowFilter.

The other form doesn't have a starting RowFilter but in both forms I later change the RowFilter (depending on user actions), column 0 never comes back.

Seems specifying RowFilter too soon after hiding columns fails for column 0.

Very very weird!!!! Very very frustrating!!!!

Answer 5

I would like to contribute a perspective that has not been mentioned.

Each column of the DataGridView has a property name. You can directly access the column by name, as you would to access any other element. For example: ColumnName.Property = AnyProperty. In your case: ColumnName.Visible = false.

I think it is cleaner, more direct, and less likely to make a mistake. We also help a bit the compiler :)

In this way, it is not necessary to use the property name of the DataGridView, neither locate the desired column mediate a string (which potentially can be commited an error). I mean this: YourDataGridView.Columns ["YourColumn"] Property = AnyProperty.

Answer 6

That's odd.

Are you certain you are calling the right column name? I realize that would be a stupid mistake to make, but it happens!

Here's a simple test you could try:

void test(string columnName, bool visibility) {
  if (dataGridView1.Columns.Contains(columnName)) {
    dataGridView1.Columns[columnName].Visible = visibility;
  } else {
    throw new Exception(string.Format("Column '{0}' does not exist in DataGridView '{1}'.", columnName, dataGridView1.Name));
  }
}

Answer 7

I had the same issue and none of the above worked for me. My fix was to set a DataPropertyName at least for the column that should be hidden in the designer at "Edit columns".

Answer 8

If you want to hide a column by name, you have to give a Name at your column. Initiliaze the property Name and after you can use it by code.

Answer 9

I was having the same problem, and I did not want have to change the index of my id column to the visible property works. So I noticed that after I indicated that the id column visible = false , I was deleting the last row of the DataGridView and this is what was making the id column appear. So I delete the row first and then indicate that the id column = false .

Answer 10

I have a similar problem. I added an unbound checkbox column to my data bound grid. It became the first column. When I stepped through my grid like so:

for (int i = 0; i < grvQuoteCostSheets.RowCount; i++)
{
   grvQuoteCostSheets[grcQCostSProfit.Index, i].Value
      = (Convert.ToInt32(grvQuoteCostSheets[grcQCostSPrice.Index, i].Value) - Convert.ToInt32(grvQuoteCostSheets[grcQCostSTotalCost.Index, i].Value));
}
idColumn.Visible = false;   //Need to rehide.

The first hidden column visibility switched to False. I moved the CKBox column from first to 3rd place as suggested in a different answer (the next two columns being an ID value & Line# respectively, and hidden) and the checkbox column stayed hidden. I was hiding the ID column after the math as it was flipping to Visible. I just lived with it before (hiding the ID column after the math loop), but now that I added the checkbox column, I decided to dig a bit, and here I am. I also tried doing the math in a list grabbed from the grid, and the checkbox column would still flip to Visible when the CKBox was first. I'm still stuck with the first hidden column wanting to flip to visible, so I re-hide it. I do have AutoGenerateColumns = False and am explicitly setting the first column visibility to false as well. Both to no avail.

Answer 11

Don't know if anybody is still struggling with the issue. I had the same problem and was setting the visible property in the dataSourceChanged event.

When I put the visible false in the show event instead it worked.