Question

我有十进制输入问题，这是我在按钮上使用的代码

private void button6_Click_1(object sender, EventArgs e)
    {
        string PName = "كريب دجاج شاورما";
        string PPrice = "20.50";
        string PQty = "1";

        textBox1.Text = PName;
        textBox6.Text = PPrice;
        textBox2.Text = PQty;
        textBox5.Text = "0";
    }

    private void button7_Click_1(object sender, EventArgs e)
    {
        string PName = "كريب تشيكن شريمبو";
        string PPrice = "28";
        string PQty = "1";

        textBox1.Text = PName;
        textBox6.Text = PPrice;
        textBox2.Text = PQty;
        textBox5.Text = "0";
    }

单击PPrice 20.50时单击它在文本框6中显示无效值当点击PPrice 28的第二个时，它会正常继续

我该如何修复它以便接受小数？

更新

以前的代码不是问题，真正的问题是这个代码，它显示的错误不是在文本框本身进行计算时所以这里是完整的代码

private void button6_Click_1(object sender, EventArgs e)
    {
        string PName = "كريب دجاج شاورما";
        string PPrice = "20.50";
        string PQty = "1";

        textBox1.Text = PName;
        textBox6.Text = PPrice;
        textBox2.Text = PQty;
        textBox5.Text = "0";
    }

    private void button7_Click_1(object sender, EventArgs e)
    {
        string PName = "كريب تشيكن شريمبو";
        string PPrice = "28";
        string PQty = "1";

        textBox1.Text = PName;
        textBox6.Text = PPrice;
        textBox2.Text = PQty;
        textBox5.Text = "0";
    } private void textBox3_TextChanged(object sender, EventArgs e)
    {

        Multiply();
    }

    private void textBox6_TextChanged(object sender, EventArgs e)
    {
        int first = 0;
        int second = 0;
        if (Int32.TryParse(textBox5.Text, out second) && Int32.TryParse(textBox6.Text, out first))
            textBox3.Text = (first + second).ToString();
    }

    private void textBox5_TextChanged(object sender, EventArgs e)
    {
        int first = 0;
        int second = 0;
        if (Int32.TryParse(textBox5.Text, out second) && Int32.TryParse(textBox6.Text, out first))
            textBox3.Text = (first + second).ToString();
    }

Answer 1

您收到错误是因为您尝试将带小数点的字符串转换为整数。

您有以下代码：

string PPrice = "20.50";
textBox6.Text = PPrice;

然后你有这个代码：

int first = 0;
int second = 0;
if (Int32.TryParse(textBox5.Text, out second) && Int32.TryParse(textBox6.Text, out first))
            textBox3.Text = (first + second).ToString();

Int.TryParse(textbox6.Text, out first失败并返回false，因为20.50无法转换为integer。

您需要将值解析为十进制，如果成功，则继续：

decimal pPrice;

if (decimal.TryParse(textbox6.Text, out pPrice))
{
    // do what you need 
}
else
{
}

十进制值给出错误

1 个答案: