Question

我正在学习一些ASP并完成一些练习。

我有一个任务，我要有5个TextBox和一个提交按钮。

单击提交按钮时，网页将返回最大值。

例如：

num1 = 55
num2 = 66
num3 = 77
num4 = 88
num5 = 1

该脚本将返回： “最大值是：88”

到目前为止，这是我的代码：

<%@ Page Language="VB" %>
<!DOCTYPE html>
<script runat="server">

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
        submit.Text = "Submit"
        returnLabel.Text = ""
    End Sub

    Protected Sub submit_Click(ByVal sender As Object, ByVal e As System.EventArgs)

        'Not sure what to place here

    End Sub

</script>
<html>
<head id="Head1" runat="server">
<title>Exercise 7</title>
</head>

<body>
<form id="webform" runat="server">
    <div>
        <p><asp:TextBox ID="number1" runat="server"></asp:TextBox></p>
        <p><asp:TextBox ID="number2" runat="server"></asp:TextBox></p>
        <p><asp:TextBox ID="number3" runat="server"></asp:TextBox></p>
        <p><asp:TextBox ID="number4" runat="server"></asp:TextBox></p>
        <p><asp:TextBox ID="number5" runat="server"></asp:TextBox></p>
        <p><asp:Button ID="submit" runat="server"></asp:Button></p>
        <p><asp:Label ID="returnLabel" runat="server"></asp:Label></p>
    </div>
</form>
</body>
</html>

我不知道如何编写一个可以检测5个值之间最高值的脚本。

谢谢，

彼得

Answer 1

假设它们都包含数字。您可以检查每个文本框并逐个找出其中最大的文本框。

首先获取第一个数字，假设这是最大的数字然后将该数字与第二个数字进行比较，如果它更大，那么我们有一个新的最大数字像这样继续，直到比较所有数字。

Dim largestValue As Integer

largestValue = Int32.Parse(number1.Text)

If Int32.Parse(number2.Text) > largestValue Then
    largestValue = Int32.Parse(number2.Text)
End If

If Int32.Parse(number3.Text) > largestValue Then
    largestValue = Int32.Parse(number3.Text)
End If

If Int32.Parse(number4.Text) > largestValue Then
    largestValue = Int32.Parse(number4.Text)
End If

If Int32.Parse(number5.Text) > largestValue Then
    largestValue = Int32.Parse(number5.Text)
End If

Answer 2

检查一下：

  <%@ Page Language="VB" %>
    <!DOCTYPE html>
    <script runat="server">

        Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
            submit.Text = "Submit"
            returnLabel.Text = ""
        End Sub

        Protected Sub submit_Click(ByVal sender As Object, ByVal e As System.EventArgs)


     Dim i As Integer
i=number1.text
            If (i > number2.Text) Then
                If (i >  number3.Text) Then
                    If (i >  number4.Text) Then
                        If (i >  number5.Text) Then
                          returnLabel.text="The largest value is: " & i
                        End If
                    End If
                End If
            Else
                If ( number2.Text >  number3.Text) Then
                    If ( number2.Text>  number4.Text) Then
                        If ( number2.Text >  number5.Text) Then
       returnLabel.text="The largest value is: " & number2.Text 
                        End If
                    End If
                Else
                    If ( number3.Text >  number4.Text) Then
                        If ( number3.Text >  number5.Text) Then
    returnLabel.text="The largest value is: " & number3.Text 
                        End If
    else
                        If ( number4.Text >  number5.Text) Then
    returnLabel.text="The largest value is: " & number4.Text 
                        Else
    returnLabel.text="The largest value is: " & number5.Text 
                        End If
                    End If
                End If


            End If

        End Sub

    </script>
    <html>
    <head id="Head1" runat="server">
    <title>Exercise 7</title>
    </head>

    <body>
    <form id="webform" runat="server">
        <div>
            <p><asp:TextBox ID="number1" runat="server"></asp:TextBox></p>
            <p><asp:TextBox ID="number2" runat="server"></asp:TextBox></p>
            <p><asp:TextBox ID="number3" runat="server"></asp:TextBox></p>
            <p><asp:TextBox ID="number4" runat="server"></asp:TextBox></p>
            <p><asp:TextBox ID="number5" runat="server"></asp:TextBox></p>
            <p><asp:Button ID="submit" runat="server"></asp:Button></p>
            <p><asp:Label ID="returnLabel" runat="server"></asp:Label></p>
        </div>
    </form>
    </body>
    </html>

Answer 3

当您将所需的文本框写为数组时，另一种方式更灵活：

int maxValue = (new TextBox[] { TextBox1, TextBox2, TextBox3, TextBox4, TextBox5 }).
    ToList().ConvertAll(t => Int32.TryParse(t.Text, out curValue) ? new int?(curValue) : (int?)null).
    Max(m => (!m.HasValue) ? 0 : m.Value);

如何从各种ASP TextBox值中获取最大值？

3 个答案: