ASP.Net/Language Basics/Function

Материал из .Net Framework эксперт
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Call function (C#)

<script Language="c#" runat="server">
  void Page_Load() 
  {
    DateTime DueDate;
    DateTime CheckOutDate;
    CheckOutDate = DateTime.Now;
    DueDate = FindDueDate(CheckOutDate);
    message1.Text = "<br>Checked OUT Date:" + CheckOutDate;
    message2.Text = "<br>Due date is " + DueDate.ToString("d");
  }
  DateTime FindDueDate(DateTime CheckOutDate)
  {
     return CheckOutDate + TimeSpan.FromDays(14);
  }
</script>
<html>
<head>
<title>Sample Function Page</title>
</head>
<body>
  <asp:label id="message1" runat="server"/>
  <asp:label id="message2" runat="server"/>
</body>
</html>



Define and call function (C#)

<script Language="c#" runat="server">
  void Page_Load()
  {
    message1.Text="";
    message1.Text+="<BR />Calling Function 1...";
    Function1();
    message1.Text+="<BR />Calling Function 2...";
    Function2();
    message1.Text+="<BR />Calling Function 1...";
    Function1();
  }
  void Function1()
  {
    string Different = "<i>in Function 1</i>";
    message1.Text+= Different;
  }
  void Function2()
  {
    string Different = "<b>in Function 2</b>";
    message1.Text+= Different;
  }
</script>
<html>
<head>
<title>Scope</title>
</head>
<body>
<asp:label id="message1" runat="server"/>
</body>
</html>



Define and call function in a page (VB.net)

<%@ Page Language="VB" %>
<html>
<head>
   <title>Simple ASP.NET Page</title>
   <script runat="server">
      Sub SayHello()
         Response.Write("Hello, World!")
      End Sub
   </script>
</head>
<body>
<% SayHello %>
</body>
</html>



Define function to change "HR" length (C#)

<%@ Page Language="C#" Debug="true" %>
<script runat="server">
    void Page_Load()
    {
        if (IsPostBack)
        {
    
            lblMessage.Text = "First Line";
            InsertLinebreak(Convert.ToInt32(NumberOptions.SelectedItem.Value),
                            Convert.ToInt32(WidthOptions.SelectedItem.Value));
            lblMessage.Text += "Second Line";
            InsertLinebreak(Convert.ToInt32(NumberOptions.SelectedItem.Value),
                            Convert.ToInt32(WidthOptions.SelectedItem.Value));
        }
    }
    
    void InsertLinebreak(int NumLines, int Width)
    {
        for (int i=1; i<=NumLines; i++)
        {
           lblMessage.Text += "<br><hr width="" + Width.ToString() +
                              "" align="left">";
        }
    }
</script>
<html>
<head>
    <title>Using Functions with Parameters</title>
</head>
<body>
    Choose the number and width of the linebreaks and then press submit 
    <form runat="server">
        <asp:RadioButtonList id="WidthOptions" runat="server">
            <asp:ListItem value="100">100 pixels wide</asp:ListItem>
            <asp:ListItem value="300">300 pixels wide</asp:ListItem>
            <asp:ListItem value="600">600 pixels wide</asp:ListItem>
        </asp:RadioButtonList>
        <asp:DropDownList id="NumberOptions" runat="server">
            <asp:ListItem value="1">1 Line</asp:ListItem>
            <asp:ListItem value="2">2 Lines</asp:ListItem>
            <asp:ListItem value="3">3 Lines</asp:ListItem>
        </asp:DropDownList>
        <asp:Button id="Button1" runat="server" text="Submit"></asp:Button>
        <br />
        <br />
        <asp:Label id="lblMessage" runat="server"></asp:Label>
    </form>
</body>
</html>



Function local variable (C#)

<script Language="c#" runat="server">
  void Page_Load()
  {
    message1.Text="";
    message1.Text+="<BR />Calling Function 1...";
    Function1();
    message1.Text+="<BR />Calling Function 2...";
    Function2();
    message1.Text+="<BR />Calling Function 1...";
    Function1();
  }
  void Function1()
  {
    string Different = 
                "<i>Hello I"m the variable Different in Function 1</i>";
    message1.Text+= Different;
  }
  void Function2()
  {
    string Different = 
                "<b>Hello I"m the variable Different in Function 2</b>";
    message1.Text+= Different;
  }
</script>
<html>
<head>
<title>Scope</title>
</head>
<body>
<asp:label id="message1" runat="server"/>
</body>
</html>



Function Parameter passed by Reference (C#)

<%@ Page Language="C#" %>
<script runat="server">
    void Page_Load()
    {
        int a = 1;
        Increment(ref a);
        lblMessage.Text = a.ToString();
    }
    
    void Increment(ref int Number)
    {
        Number += 1;
    }
</script>
<html>
<head>
    <title>Demonstration of Passing a Parameter by Reference</title>
</head>
<body>
    <asp:Label id="lblMessage" runat="server"></asp:Label>
</body>
</html>



Function Parameter passed by Value (C#)

<%@ Page Language="C#" %>
<script runat="server">
    void Page_Load()
    {
        int a = 1;
        Increment(a);
        lblMessage.Text = a.ToString();
    }
    
    void Increment(int Number)
    {
        Number += 1;
    }
</script>
<html>
<head>
    <title>Demonstration of Passing a Parameter by Value</title>
</head>
<body>
    <asp:Label id="lblMessage" runat="server"></asp:Label>
</body>
</html>



Page level procedure (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If IsPostBack Then
        DisplayInstructions("Final")
    Else
        DisplayInstructions("Initial")
    End If    
End Sub
Sub SubmitBtn_Click(Sender As Object, E As EventArgs)
    lblResult.Text = "Result: " & AddNums( _
        txtNumber1.Text, txtNumber2.Text)
End Sub
Sub DisplayInstructions(Mode as String)
    If Mode = "Initial" Then
      lblInstructions.Text = "Enter two numbers that " _
          & "you want to add."
    Else
      lblInstructions.Text = "The results are " _
          & "below."
    End If
End Sub
Function AddNums(Num1 as Single, Num2 as Single) as Single
   AddNums = Num1 + Num2
End Function
</script>
<HTML>
<HEAD>
<TITLE>Creating Your Own Procedures</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<asp:label
    id="lblInstructions" 
    runat="server"
/>
<BR><BR>
Enter a number:<BR>
<asp:textbox 
    id="txtNumber1" 
    runat=server 
/>
<BR><BR>
Enter a second number:<BR>
<asp:textbox 
    id="txtNumber2" 
    runat=server 
/>
<BR><BR>
<asp:button 
    id="butOK"
    text="Add"
    onclick="SubmitBtn_Click" 
    runat="server"
/>
<BR><BR>
<asp:label
    id="lblResult" 
    runat="server"
/>
</Form>
</BODY>
</HTML>



Simple function without parameters (C#)

<%@ Page Language="C#" Debug="true" %>
<script runat="server">
    void Page_Load()
    {
        lblMessage.Text = "First Line";
        InsertLinebreak();
        lblMessage.Text += "Second Line";
        InsertLinebreak();
        lblMessage.Text += "Third Line";
        InsertLinebreak();
    }
    
    void InsertLinebreak()
    {
        lblMessage.Text += "<br><hr>";
    }
</script>
<html>
<head>
    <title>Simple Function Example</title>
</head>
<body>
    <form runat="server">
        <asp:Label id="lblMessage" runat="server"></asp:Label>
    </form>
</body>
</html>



Using out Parameters (C#)

<%@ Page Language="C#" %>
<script runat="server">
    void Page_Load()
    {
        int a = 1;
        int b;
        Increment(a, out b);
        lblMessage.Text = b.ToString();
    }
    
    void Increment(int Number, out int Result)
    {
        Result = Number + 1;
    }
</script>
<html>
<head>
    <title>Demonstration of using out Parameters</title>
</head>
<body>
    <asp:Label id="lblMessage" runat="server"></asp:Label>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.Net/Language_Basics/Function&oldid=2200»