Mark / Uncheck button check box

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Mark / Uncheck button check box

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#1 by (4 votes)

1

In my program there is a button to mark and the same button to uncheck a checkbox.

Example: If I click once, it marks the checkbox, if I click the button again it unchecks the check box. However, clicking again no longer marks the checkbox, after the second click the button loses the action.

Follow my code:

public frmLaudosPS()
{
    InitializeComponent();
    this.btn_seleciona.Click += this.marcar;
}

private void marcar(object sender, EventArgs e)
{
    DataTable table = (DataTable)dgw_laudos.DataSource;
    foreach (DataRow row in table.Rows)
        row["SELECIONAR"] = true;
    this.btn_seleciona.Click -= this.marcar;
    this.btn_seleciona.Click += this.desmarcar;
}

private void desmarcar(object sender, EventArgs e)
{
    DataTable table = (DataTable)dgw_laudos.DataSource;
    foreach (DataRow row in table.Rows)
        row["SELECIONAR"] = false;
}

c# winforms

asked by anonymous 12.07.2018 / 20:03

1 answer

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score 4 · Accepted Answer

You still have to remove and add the handler in the uncheck event as well. Without it the code does not make sense.

private void desmarcar(object sender, EventArgs e)
{
    DataTable table = (DataTable)dgw_laudos.DataSource;
    foreach (DataRow row in table.Rows)
        row["SELECIONAR"] = false;

    this.btn_seleciona.Click -= this.desmarcar;
    this.btn_seleciona.Click += this.marcar;
}

Anyway, I think it would be a lot more interesting to keep just one method. It does not make sense to keep the same code twice just to change the value of a Boolean .

private void marcar_desmarcar(object sender, EventArgs e)
{
    DataTable table = (DataTable)dgw_laudos.DataSource;
    foreach (DataRow row in table.Rows)
        row["SELECIONAR"] = !Convert.ToBoolean(row["SELECIONAR"]);
}