c#菜鸟问题

[ztyx8x9]

两个文本框，textchange促发事件，当两个文本框中都为数字时两者相乘放到第三个文本框，求代码....

[ztyx8x9]

不知道该怎么描述这个问题，你说的貌似度娘很神的样子

[llkaximoduo]

前台

<div>
        <asp:TextBox ID="TextBox1" runat="server" OnTextChanged="TextBox1_TextChanged" AutoPostBack="true "></asp:TextBox>
        *
        <asp:TextBox ID="TextBox2" runat="server" OnTextChanged="TextBox2_TextChanged" AutoPostBack="true "></asp:TextBox>
        =
        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
    </div>

cs页面

namespace WebApplication2
{
public partial class test1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
int num1 = 0;
int num2 = 0;
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(TextBox1.Text.Trim()))
{
num1 = ConvertStringToInteger(TextBox1.Text.Trim());
}
if (!string.IsNullOrEmpty(TextBox2.Text.Trim()))
{
num2 = ConvertStringToInteger(TextBox2.Text.Trim());
}
TextBox3.Text = (num1 * num2).ToString();
}

protected void TextBox2_TextChanged(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(TextBox1.Text.Trim()))
{
num1 = ConvertStringToInteger(TextBox1.Text.Trim());
}
if (!string.IsNullOrEmpty(TextBox2.Text.Trim()))
{
num2 = ConvertStringToInteger(TextBox2.Text.Trim());
}
TextBox3.Text = (num1 * num2).ToString();
}

private static int ConvertStringToInteger(string s)
{
int result = 0;
int.TryParse(s, out result);
return result;
}
}
}

[llkaximoduo]

<div>
        <asp:TextBox ID="TextBox1" runat="server" OnTextChanged="TextBox1_TextChanged" AutoPostBack="true "></asp:TextBox>
        *
        <asp:TextBox ID="TextBox2" runat="server" OnTextChanged="TextBox2_TextChanged" AutoPostBack="true "></asp:TextBox>
        =
        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
    </div>

namespace WebApplication2
{
    public partial class test1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        int num1 = 0;
        int num2 = 0;
        protected void TextBox1_TextChanged(object sender, EventArgs e)
        {

            num1 = ConvertStringToInteger(TextBox1.Text.Trim());
            num2 = ConvertStringToInteger(TextBox2.Text.Trim());
            TextBox3.Text = (num1 * num2).ToString();
        }

        protected void TextBox2_TextChanged(object sender, EventArgs e)
        {
            num1 = ConvertStringToInteger(TextBox1.Text.Trim());
            num2 = ConvertStringToInteger(TextBox2.Text.Trim());
            TextBox3.Text = (num1 * num2).ToString();
        }

        private static int ConvertStringToInteger(string s)
        {
            int result = 0;
            int.TryParse(s, out result);
            return result;
        }
    }
}

[shadan05]

这个问题你都要问？

[Osiris4Net]

在窗体中摆三个TextBox，分别叫做txt被乘数，txt乘数，txt积……
using System;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.txt被乘数.TextChanged += new EventHandler(被乘数或乘数_TextChanged);// 改变被乘数时触发事件
this.txt乘数.TextChanged += new EventHandler(被乘数或乘数_TextChanged);// 改变乘数时触发事件
}

void 被乘数或乘数_TextChanged(object sender, EventArgs e)
{
try
{
decimal 被乘数 = Convert.ToDecimal(this.txt被乘数.Text);
decimal 乘数 = Convert.ToDecimal(this.txt乘数.Text);
this.txt积.Text = (被乘数 * 乘数).ToString();
}
catch
{
this.txt积.Text = string.Empty;
}
}
}
}

[Osiris4Net]

被乘数或乘数改变时应该作出同样的处理——求积，所以用同一个事件来描述一个处理会更合适。

[xiangqianbo]

TextChange中看两个文本框中是不是有值，且是数字，是的话相乘赋值就完了呗！

[JinJJ1402]

建议楼上百度