int和String计算 [英] int and String Calculation

问题描述

我有3个TextBox和1个按钮



第一个TextBox值= 2

第二个TextBox值= 2

然后单击按钮我想要答案

第三个TextBox值= 4



AND





第一个TextBox值= ab

第二个TextBox值= cd

然后点击按钮我想要答案

第三个TextBox值= abcd



如何解决它，请帮助我

I have 3 TextBox and 1 Button

First TextBox Value=2
Second TextBox Value=2
Then Click Button i want Answer
Third TextBox Value = 4

AND


First TextBox Value=ab
Second TextBox Value=cd
Then Click Button i want Answer
Third TextBox Value = abcd

How to Solve its, Please Help Me

推荐答案

尝试解析将内容转换为整数，如果有效则另外加上连接。

Try parsing the content into integers, if that works add otherwise concatenate.

private void button_Click(object sender, EventArgs e)
{
    int a;
    int b;

    if (Int32.TryParse(textBox1.Text, out a) && Int32.TryParse(textBox2.Text, out b))
        textBox3.Text = Convert.ToString(a + b);
    else
        textBox3.Text = textBox1.Text + textBox2.Text;
}

希望这会有所帮助，

Fredrik

Hope this helps,
Fredrik

string val1 = "", val2 = "", val3 = "";
try
{
    // as a digits
    val1 = text1.Value;
    val2 = text2.Value;
    val3 = (Convert.ToInt32(val1) + Convert.ToInt32(val2)).ToString();
    txt3.Value = val3;
}
catch (Exception ex)
{
    // as a string
    val1 = text1.Value;
    val2 = text2.Value;
    val3 = val1 + val2;
    txt3.Value = val3;

}

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