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sender对象的使用方法笔记

2007-06-13 16:18 393 查看

<%@ Page Language="C#" Debug="True" %>
<script runat="server">

void Calc(object sender, EventArgs e)
{
double answer;
Button PressedButton = (Button)sender;
switch (PressedButton.ID)
{
case "btnAdd":
answer = Convert.ToDouble(txtInput1.Text) +
Convert.ToDouble(txtInput2.Text);
lblAnswer.Text = answer.ToString();
break;
case "btnSubtract":
answer = Convert.ToDouble(txtInput1.Text) -
Convert.ToDouble(txtInput2.Text);
lblAnswer.Text = answer.ToString();
break;
case "btnMultiply":
answer = Convert.ToDouble(txtInput1.Text) *
Convert.ToDouble(txtInput2.Text);
lblAnswer.Text = answer.ToString();
break;
case "btnDivide":
answer = Convert.ToDouble(txtInput1.Text) /
Convert.ToDouble(txtInput2.Text);
lblAnswer.Text = answer.ToString();
break;
}
PressedButton.BackColor = System.Drawing.Color.Yellow;
}

</script>
<html>
<head>
<title>Chapter 6 - Calculator example v2</title>
</head>
<body>
<form runat="server">
<h2>Calculator Version 2
</h2>
<asp:TextBox id="txtInput1" runat="server"></asp:TextBox>
<asp:Button id="btnAdd" onclick="Calc" runat="server" Text=" + "></asp:Button>
<asp:Button id="btnSubtract" onclick="Calc" runat="server" Text=" - "></asp:Button>
<br />
<asp:TextBox id="txtInput2" runat="server"></asp:TextBox>
<asp:Button id="btnMultiply" onclick="Calc" runat="server" Text=" x "></asp:Button>
<asp:Button id="btnDivide" onclick="Calc" runat="server" Text=" ÷ "></asp:Button>
<br />
<strong>Answer = <asp:Label id="lblAnswer" runat="server"></asp:Label></strong>
</form>
</body>
</html>

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