算术运算结果不以标签显示 [英] Arithmetic operation Result is not display in lable

问题描述

  protected   void  RadioButton2_CheckedChanged（对象发​​件人，EventArgs e）
 {
  int  no1，no2; 
  float  ans; 
 
 no1 = Convert.ToInt32（  textbox2.Text）; 
 no2 = Convert.ToInt32（  textbox3.Text）; 
 ans = no1  -  no2; 
 Label2.Text = ans.ToString（）; 
} 
 受保护  void  RadioButton1_CheckedChanged（ object  sender，EventArgs e）
 {
  int  no1，no2; 
  float  ans; 
 
 no1 = Convert.ToInt32（  textbox2.Text）; 
 no2 = Convert.ToInt32（  textbox3.Text）; 
 ans = no1 + no2; 
 Label2.Text = ans.ToString（）; 
} 
 受保护  void  RadioButton3_CheckedChanged（ object  sender，EventArgs e）
 {
  int  no1，no2; 
  float  ans; 
 
 no1 = Convert.ToInt32（  textbox2.Text）; 
 no2 = Convert.ToInt32（  textbox3.Text）; 
 
 
 ans = no1 * no2; 
 Label2.Text = ans.ToString（）; 
 
} 
 受保护  void  RadioButton4_CheckedChanged（ object  sender，EventArgs e）
 {
  int  no1，no2; 
  float  ans; 
 
 no1 = Convert.ToInt16（  textbox2.Text）; 
 no2 = Convert.ToInt16（  textbox3.Text）; 
 ans = no1 / no2; 
 Label2.Text = ans.ToString（）; 
} 

解决方案

我不知道为什么，但你试图将文本textbox1.Text转换为一个整数，而不是文本框中的值：

  protected  < span class =code-keyword> void  RadioButton2_CheckedChanged（ object  sender，EventArgs e）
 {
  int  no1，no2; 
  float  ans; 
 
 no1 = Convert.ToInt32（textbox2.Text）;  //  这就是问题所在的问题 
 no2 = Convert.ToInt32（textbox3.Text ）;  //  所有带引号的线 
 ans = no1  -  no2; 
 Label2.Text = ans.ToString（）; 
} 
 受保护  void  RadioButton1_CheckedChanged（ object  sender，EventArgs e）
 {
  int  no1，no2; 
  float  ans; 
 
 no1 = Convert.ToInt32（textbox2.Text）; 
 no2 = Convert.ToInt32（textbox3.Text）; 
 ans = no1 + no2; 
 Label2.Text = ans.ToString（）; 
} 
 受保护  void  RadioButton3_CheckedChanged（ object  sender，EventArgs e）
 {
  int  no1，no2; 
  float  ans; 
 
 no1 = Convert.ToInt32（textbox2.Text）; 
 no2 = Convert.ToInt32（textbox3.Text）; 
 
 
 ans = no1 * no2; 
 Label2.Text = ans.ToString（）; 
 
} 
 受保护  void  RadioButton4_CheckedChanged（ object  sender，EventArgs e）
 {
  int  no1，no2; 
  float  ans; 
 
 no1 = Convert.ToInt16（textbox2.Text）; 
 no2 = Convert.ToInt16（textbox3.Text）; 
 ans = no1 / no2; 
 Label2.Text = ans.ToString（）; 
} 

在进行转换时取消引号;）



替换它

 Convert.ToInt32（  textbox2.Text ）; 

有了这个

 Convert.ToInt32（textbox2.Text）; 

protected void  RadioButton2_CheckedChanged(object sender, EventArgs e)
{
    int no1, no2;
    float ans;

    no1 = Convert.ToInt32("textbox2.Text");
    no2 = Convert.ToInt32("textbox3.Text");
    ans = no1 - no2;
    Label2.Text = ans.ToString();
}
    protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
    {
        int no1, no2;
        float ans;

        no1 = Convert.ToInt32("textbox2.Text");
        no2 = Convert.ToInt32("textbox3.Text");
        ans = no1 + no2;
        Label2.Text = ans.ToString();
    }
    protected void RadioButton3_CheckedChanged(object sender, EventArgs e)
    {
        int no1, no2;
        float ans;

        no1 = Convert.ToInt32("textbox2.Text");
        no2 = Convert.ToInt32("textbox3.Text");


            ans = no1 * no2;
            Label2.Text = ans.ToString();

    }
    protected void RadioButton4_CheckedChanged(object sender, EventArgs e)
    {
        int no1, no2;
        float ans;

        no1 = Convert.ToInt16("textbox2.Text");
        no2 = Convert.ToInt16("textbox3.Text");
        ans = no1 /no2;
        Label2.Text =ans.ToString();
    }

解决方案

I don't know why, but you are trying to convert the text "textbox1.Text" to an integer, not the value in the textbox:

protected void  RadioButton2_CheckedChanged(object sender, EventArgs e)
{
    int no1, no2;
    float ans;
 
    no1 = Convert.ToInt32(textbox2.Text);    //THIS IS WHERE THE PROBLEM WAS ON
    no2 = Convert.ToInt32(textbox3.Text);    //ALL THESE LINES WITH QUOTES
    ans = no1 - no2;
    Label2.Text = ans.ToString();
}
    protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
    {
        int no1, no2;
        float ans;
 
        no1 = Convert.ToInt32(textbox2.Text);
        no2 = Convert.ToInt32(textbox3.Text);
        ans = no1 + no2;
        Label2.Text = ans.ToString();
    }
    protected void RadioButton3_CheckedChanged(object sender, EventArgs e)
    {
        int no1, no2;
        float ans;
 
        no1 = Convert.ToInt32(textbox2.Text);
        no2 = Convert.ToInt32(textbox3.Text);
 

            ans = no1 * no2;
            Label2.Text = ans.ToString();
 
    }
    protected void RadioButton4_CheckedChanged(object sender, EventArgs e)
    {
        int no1, no2;
        float ans;
 
        no1 = Convert.ToInt16(textbox2.Text);
        no2 = Convert.ToInt16(textbox3.Text);
        ans = no1 /no2;
        Label2.Text =ans.ToString();
    }

Suppress the quotes when you're doing conversions ;)

Replace this

Convert.ToInt32("textbox2.Text");

With that

Convert.ToInt32(textbox2.Text);

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