使用鍵盤上的Enter作為計算器相同

Question

當我嘗試在鍵盤上使用Enter鍵時，它總是輸入最近在屏幕上按下的數字。 我想使用鍵盤上的Enter鍵相等，而不是輸入用戶最近在屏幕上按下的數字。

我正在使用Visual Studio Community 2013在C＃中編寫計算器。

public calculatorForm()
{
        InitializeComponent();
}

// Manages the numeracy and period buttons
private void mathematicalButtons_Click(object sender, EventArgs e)
{
        if ((calculatorResults.Text == "0")||(operationPressed))
            calculatorResults.Clear();

        operationPressed = false;

        Button a = (Button)sender;

        if (a.Text == ".")
        {
            if(!calculatorResults.Text.Contains("."))
                calculatorResults.Text = calculatorResults.Text + a.Text;
        }
        else
            calculatorResults.Text = calculatorResults.Text + a.Text;            
}

// Manages the addition, subtract, multiplication, and divide buttons
private void operatorButtons_Click(object sender, EventArgs e)
{
        Button a = (Button)sender;

        if (value != 0)
        {
            equalButton.PerformClick();
            operationPressed = true;
            operation = a.Text;
            equationLabel.Text = value + " " + operation;
        }
        else
        {
            operation = a.Text;
            value = double.Parse(calculatorResults.Text);
            operationPressed = true;
            equationLabel.Text = value + " " + operation;
        }
}

// Manages the clear button
private void clearButton_Click(object sender, EventArgs e)
{
        calculatorResults.Text = "0";
        value = 0;
        equationLabel.Text = "";
}

// Manages the clear entry button
private void clearEntryButton_Click(object sender, EventArgs e)
{
        calculatorResults.Text = "0";
}

// Manages the equal button
private void equalButton_Click(object sender, EventArgs e)
{
        equationLabel.Text = "";

        switch (operation)
        {
            case "+":
                calculatorResults.Text = (value + Double.Parse(calculatorResults.Text)).ToString();
                break;

            case "-":
                calculatorResults.Text = (value - Double.Parse(calculatorResults.Text)).ToString();
                break;

            case "*":
                calculatorResults.Text = (value * Double.Parse(calculatorResults.Text)).ToString();
                break;

            case "/":
                calculatorResults.Text = (value / Double.Parse(calculatorResults.Text)).ToString();
                break;

            default:
                break;
        }

        value = Double.Parse(calculatorResults.Text);
        operation = "";
}

// Allows user to use computer keyboard to enter data
private void calculatorForm_KeyPress(object sender, KeyPressEventArgs e)
{
        switch (e.KeyChar.ToString())
        {
            case "0":
                zeroButton.PerformClick();
                break;

            case "1":
                oneButton.PerformClick();
                break;

            case "2":
                twoButton.PerformClick();
                break;

            case "3":
                threeButton.PerformClick();
                break;

            case "4":
                fourButton.PerformClick();
                break;

            case "5":
                fiveButton.PerformClick();
                break;

            case "6":
                sixButton.PerformClick();
                break;

            case "7":
                sevenButton.PerformClick();
                break;

            case "8":
                eightButton.PerformClick();
                break;

            case "9":
                nineButton.PerformClick();
                break;

            case ".":
                periodButton.PerformClick();
                break;

            case "/":
                divideButton.PerformClick();
                break;

            case "*":
                multiplicationButton.PerformClick();
                break;

            case "-":
                subtractButton.PerformClick();
                break;

            case "+":
                additionButton.PerformClick();
                break;

            case "=":
                equalButton.PerformClick();
                break;

            default:
                break;
        }
    }
}

Answer 1

這里的問題是當你按下回車鍵時，帶焦點的控件會抓住事件。 單擊某個按鈕時，會為其指定焦點，因此下次單擊“輸入”時，該按鈕將抓取該事件，如果是按鈕，則輸入鍵將被解釋為按下按鈕。

你想要的是表單始終具有焦點，這樣你就知道關鍵事件將始終轉到表單而不是任何其他控件（例如按鈕）。 為了做到這一點，請看看這個問題的答案： C＃停止按鈕從獲得焦點點擊

如果您需要更多幫助，請告訴我們！

Answer 2

btn_equalButton.Focus();

點擊按鈕后將其放入，只需將焦點更改為等於。 當您單擊回車鍵時，它將執行它所關注的按鈕的單擊事件。

所有控件上的TabStop = false設置tab index to -1也可以

這樣按壓標簽不會移動焦點