Home / Questions / 42518
Accepted
lois6b
Asked: 2020-01-06 04:05:46 +0800 CST 2020-01-06 04:05:46 +0800 CST

What event do I have to use?

  • 772

I have a desktop application made in VisualStudio in C#.

This table shows the names of several files uploaded to a server, and a column with a Check to select which ones you want to download.

enter image description here

When the app is opened, all cells are unchecked and the Download button is disabled.

I want when a checkbox is clicked to change the button property based on whether there is any checkbox selected. If there is not, it will be disabled again.

I have tried with event CellClick, CellContentClick, CellValueChanged... many. But when I put the code 1 , and I click on the checkbox, until I click on another cell the code is not executed.

What event should I use so that as soon as I click, without having to click outside or in another cell, it calculates the state in which the button has to be?

1 Code:

bool guardar = false;
        foreach (DataGridViewRow row in gvDocumentos.Rows)
        {
            if (Convert.ToBoolean(row.Cells[2].Value) == true)
            {
                guardar = true;
            }
        }
btnDescargar.enabled = guardar;
c#

3 Answers

  1. Best Answer

    do a test like this

    In the constructor add the handlers for the CellContentClick and CellValueChanged events

        public Form1()
    {
        InitializeComponent();
        this.dataGridView1.CellContentClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellContentClick);
        this.dataGridView1.CellValueChanged += DataGridView1_CellValueChanged;
    }

    It then handles the events as follows:

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
    }

    private void DataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        var valor = (bool) dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;

        btnDescargar.Enabled = valor;
    }
    • 2

  2. Try as follows:

    private void myDataGrid_OnCellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex == columnaCheckbox.Index && e.RowIndex != -1)
    {
        // Cambia el estado del botón
    }
}

    And add this code to it to let it know DataGridViewthat you're done making changes to it CheckBox:

    private void myDataGrid_OnCellMouseUp(object sender,DataGridViewCellMouseEventArgs e)
{
    if (e.ColumnIndex == columnaCheckbox.Index && e.RowIndex != -1)
    {
        dataGrid.EndEdit();
    }
}

    Reference

    • 2

  3. Testing with my example (which you brought me from my query) hahaha I'm testing while I wait if you can help me with my question and it works on the first click when you use the event:

    CellMouseClick

    Try it and then you tell me... it's wonderful!!! hahahaha and without any additional code

    • 0