Question

为防止代码重复，我正在为此寻找解决方案：

    private void sensor1SetUnits(string newUnit)
    {
        foreach (Control ctrl in groupBoxSensor1.Controls)
        {
            // initialize all labels
            if (ctrl is Label)
            {
                ((Label)ctrl).Text = newUnit;
            }
        }
    }

    private void sensor2SetUnits(string newUnit)
    {
        foreach (Control ctrl in groupBoxSensor2.Controls)
        {
            // initialize all labels
            if (ctrl is Label)
            {
                ((Label)ctrl).Text = newUnit;
            }
        }
    }
  private void uiInitControls()
    {
        sensor1SetUnits(units.celsius);
        sensor2SetUnits(units.celsius);
    }

但是，我有超过10个分组，我需要每次将所有标签更改为另一个单元。

我希望这样的事情：

    private void uiSensorChangeUnits(Control * ptrCtrl)
    {
        foreach (Control ctrl in ptrCtrl)
        {
            // initialize all labels
            if (ctrl is Label)
            {
                ((Label)ctrl).Text = units.celsius;
            }
        }

    }

    private void someFunction()
    {
        uiSensorChangeUnits(&groupBoxSensor1.Controls);
        uiSensorChangeUnits(&groupBoxSensor2.Controls);
    }

Answer 1

您可以将GroupBox传递给方法，然后使用OfType extension

来减少查找相应的控件

private void SetSensorUnitLabels(GroupBox currentGB, string newUnit)
{
    foreach (Label ctrl in currentGB.Controls.OfType<Label>())
    {
       ctrl.Text = newUnit;
    }
}


SetSensorUnitLabels(groupBoxSensor1, units.celsius);
SetSensorUnitLabels(groupBoxSensor2, units.celsius);

Answer 2

好人LINQ是你最好的选择。

    private void Form1_Load(object sender, EventArgs e)
    {
        UpdateChildrenInGroupBox<Label>("Test Label");
        UpdateChildrenInGroupBox<TextBox>("Test Textbox");

        //Wont compile
        //UpdateChildrenInGroupBox<Rectangle>("Test Rectangle");
    }

    private void UpdateChildrenInGroupBox<T>(string value) where T: Control
    {
        var allGBs = this.Controls.OfType<GroupBox>();
        var allControlsInGBs = allGBs.SelectMany(f => f.Controls.Cast<Control>());
        allControlsInGBs.OfType<T>().ToList().ForEach(f => f.Text = value);
    }

我们循环遍历Form的所有控件，它具有Type GroupBox。然后我们选择控件并将其投射到它们。然后我们得到传递的Type并设置它们的值。

Answer 3

private void UpdateUnitLabels(GroupBox groupBox, string unit)
{
    foreach (Control control in groupBox.Controls)
    {
        var label = control as Label;
        if (Label != null)
        {
            label.Text = unit;
        }
    }
}

C＃通过循环更改多个标签

3 个答案: