c# - 完成特定任务后清除每件事

Question

我正在开发一个软件，我想在完成特定任务后清除每件事，比如清除所有字段、 ListView 等，我必须写下很多要清除的东西，就像我的新按钮的代码是:

 private void btnNew_Click(object sender, EventArgs e)
    {
        txtProductCode1.ReadOnly = false;
        txtInvoiceNo.ReadOnly = false;
        cmbCustoemerType.Enabled = false;
        cmbCustomerName.Enabled = false;
        button1.Enabled = true;
        txtProductCode1.Text = null;
        txtWageName.Text = null;
        txtWageCost.Text = null;
        btnFirst.Visible = false;
        btnPrevious.Visible = false;
        btnNext.Visible = false;
        btnLast.Visible = false;
        cmbProductName.Enabled = true;
        txtQty.ReadOnly = false;
        txtPercant.ReadOnly = false;
        txtDiscount.ReadOnly = false;
        cmbCustoemerType.Enabled = true;
        cmbCustomerName.Enabled = true;
        button5.Enabled = true;
        btnDelete.Enabled = true;
        dtp1.Enabled = true;
        btnSave.Text = "&Save";

        cmbCustoemerType.Text = null;
        cmbCustomerName.Text = null;
        txtInvoiceNo.Clear();
        txtDiscount.Clear();
        txtGrandTotal.Clear();
        txtProductName.Clear();
        txtSalePrice.Clear();
        txtQty.Clear();
        txtTotal.Clear();

        txtExtraWages.Text = null;
        lvExtraWages.Items.Clear();
        lvTransaction.Items.Clear();
        lblCount.Text = null;
        lblNetTotal.Text = null;
        txtPercant.Text = null;

        txtInvoiceNo.Text = invoice.ToString();
    }

有什么方法可以避免再次编写代码，就像我需要启用我在另一个按钮上禁用的东西，所以我必须编写它的反向代码来完成任务，这真的恼人的!还有其他方法吗？

编辑:

尝试了以下代码:

private void btnNew_Click(object sender, EventArgs e)
        {   
           //using setboxdefault function
            SetTextBoxDefaults();

            cmbCustoemerType.Text = null;
            cmbCustomerName.Text = null;
        cmbCustoemerType.Enabled = false;
        cmbCustomerName.Enabled = false;
        cmbProductName.Enabled = true;
        cmbCustoemerType.Enabled = true;
        cmbCustomerName.Enabled = true;

        button5.Enabled = true;
        btnDelete.Enabled = true;  
        button1.Enabled = true;          
        btnFirst.Visible = false;
        btnPrevious.Visible = false;
        btnNext.Visible = false;
        btnLast.Visible = false;          


        btnSave.Text = "&Save";

        lvExtraWages.Items.Clear();
        lvTransaction.Items.Clear();

        lblCount.Text = null;
        lblNetTotal.Text = null;

        dtp1.Enabled = true;

        txtInvoiceNo.Text = invoice.ToString();
    }

    private void SetTextBoxDefaults()
    {
        var textBoxes = GetControls(this, typeof(TextBox));
        foreach (var textBox in textBoxes)
        {
            TextBox.Clear();
        }
    }

    public IEnumerable<Control> GetControls(Control control, Type type)
    {
        var controls = control.Controls.Cast<Control>();
        return controls.SelectMany(ctrl => GetControls(ctrl, type)).Concat(controls).Where(c => c.GetType() == type);
    }

但它在 TextBox.Clear(); 上出错，错误是错误 4

An object reference is required for the non-static field, method, or property 'System.Windows.Forms.TextBoxBase.Clear()'    

请让我知道我错在哪里..!!

Answer 1

正如 Tim 所建议的，您可以遍历控件并相应地设置每个控件..

public IEnumerable<Control> GetControls(Control control,Type type)
{
    var controls = control.Controls.Cast<Control>();
    return controls.SelectMany(ctrl => GetControls(ctrl,type)).Concat(controls).Where(c => c.GetType() == type);
}

private void btnNew_Click(object sender, EventArgs e)
{
    SetComboBoxDefaults();
    SetTextBoxDefaults();
    SetButtonDefaults();
}

private void SetComboBoxDefaults()
{
    var comboBoxes = GetControls(this, typeof(ComboBox));
    foreach (var comboBox in comboBoxes)
    {
        ((ComboBox)comboBox).Enabled = false;
        ((ComboBox)comboBox).Text = null;
    }
}

private void SetTextBoxDefaults()
{
    var textBoxes = GetControls(this, typeof(TextBox));
    foreach (var textBox in textBoxes)
    {
        ((TextBox)textBox).Clear();
    }
}

private void SetButtonDefaults()
{
    var buttons = GetControls(this, typeof(Button));
    foreach (var button in buttons)
    {
        ((Button)button).Visible = false;

        if (button.Name == "btnSave") ((Button)button).Text = "&Save";
    }
}

您还可以使用单独的 GetControl 方法，以便它返回特定类型的 Control，从而减少转换为派生类型的需要。

编辑更新:

您正在使用 TextBox 类型而不是 foreach 循环中的变量名。更新它以使用 textBox(小写)，而不是 TextBox(pascal)，见下文:

private void SetTextBoxDefaults()
{
    var textBoxes = GetControls(this, typeof(TextBox));
    foreach (var textBox in textBoxes)
    {
        ((TextBox)textBox).Clear();
    }
}