一个关于text转换的问题！！谢谢！！！！！

int sum=int.Parse(textBox1.text)+int.Parse(textBox2.text);

解决方案 »

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先写一个验证的方法
保证两个textbox输入的都是数字
然后用楼上的表达式
<html>
<head>
<script language=C# runat="server">
void click(object sender,EventArgs e)
{
try {
int result = Int32.Parse(TextBox1.Text) *  Int32.Parse(TextBox2.Text);
lb.Text = result.ToString();
} catch (Exception) {
lb.Text = "please input a int number";
}

}
</script>
</head>
<body>
    <p>

    <form runat="server">

<asp:TextBox id=TextBox1 runat=server /> *
<asp:TextBox id=TextBox2 runat=server />
=
<asp:label id=lb runat=server/>
<br>
<asp:Button id=Button1 text="multiplication" onclick="click" runat=server />
    </form>

</body>
</html>
int sum=int.Parse(textBox1.text)*int.Parse(textBox2.text);
但text必须不能为空，而且必须是数字
using System;private void button1_Click(object sender, System.EventArgs e)
{
string str1,str2,strsum;
int int1,int2,sum;
int1=0;
int2=0;
str1=textBox1.Text;
str2=textBox2.Text;
if(isnumberic(str1)) int1=int.Parse(str1);
else     MessageBox.Show("textbox1 isn't numberic!","Error");
if(isnumberic(str2)) int2=int.Parse(str2);
else     MessageBox.Show("textbox2 isn't numberic!","Error");
sum=int1*int2;
strsum=sum.ToString()+" is the summary";
if(sum!=0)     MessageBox.Show(strsum,"Summary");
}
private bool isnumberic(string str)
{
bool result=true;
int i;
for(i=1;i<str.Length;i++)
      if(!Char.IsNumber(str,i)) result=false;
return result;
}
I Agree with you
James880(混子)
int sum=(int)textBox1.text*(int)textBox2.text;
先判断是否数字
private bool isnumberic(string str)
{
   if(Regex.IsMatch(str,@"^\d+$"))return true;
   return false;
}
int sum=int.Parse(textBox1.text)+int.Parse(textBox2.text);