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Why Literals Blow Away
Response.write!
by Charles Carroll
When an ASP Classic programmer comes
to ASP.net they tend to use Response.write out of reflex. In some situations it
works and in many it does not for example:
-
<%=%> and response.writes just
output nothing if embedded in a server control (the table:cell in the
response.write example).
-
It IS slower than literals. I have
done extensive tests I will put on the site soon.
-
It allows mixing of code and
presentation/HTML which leads to may architectural problems.
But the thing that makes Literals
better are:
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The graphic designer can move around
the literal as just one tag. Whereas with response.write they would have to
somehow understand what represented "all" the related code and then mark many
lines of code to move them (Error prone because they may forget a piece).
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Literals can be carried with
ViewState. Response.writes cannot.
-
Literals can mean that your code can
add them to them many times in many code locations before the page is rendered.
Response.write cannot.
Here is an example with literals:
filename=/experiments/literals/correctamundo.aspx
<script language="VB" runat="server">
Sub Page_Load(Src As Object, E As EventArgs)
DIM counter as integer
DIM sb1 as new stringbuilder
FOR counter=1 TO 100
sb1.Append(counter)
IF counter MOD 20 = 0 THEN
sb1.Append("<br>")
ELSE
sb1.Append(" ")
END IF
NEXT COUNTER
lit1.Text=sb1.ToString()
litTime.text=DateTime.Now.ToString("G")
End Sub
</script>
<html><head>
<title>Literals Rock</title>
</head>
<body bgcolor="#FFFFFF">
<form runat="server">
<asp:literal id="lit1" runat="server"/>
<asp:Table runat="server" GridLines="both" BorderWidth="1px">
<asp:TableRow>
<asp:TableCell>Hello</asp:TableCell>
<asp:TableCell>Konnichi Wa</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>Goodnight</asp:TableCell>
<asp:TableCell>Oyasumi</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>The Time is:</asp:TableCell>
<asp:TableCell><asp:literal id="litTime" runat="server"/></asp:TableCell>
</asp:TableRow>
</asp:Table>
</form>
</body></html>
Here is a worse version (Response Write) example.
filename=/experiments/literals/justplainwrong.aspx
<script language="VB" runat="server">
Sub Page_Load(Src As Object, E As EventArgs)
End Sub
</script>
<html><head>
<title>Literals Rock</title>
</head>
<body bgcolor="#FFFFFF">
<form runat="server">
<%
DIM counter as integer
FOR counter=1 TO 100
response.write(counter)
IF counter MOD 20 = 0 THEN
response.write("<br>")
ELSE
response.write(" ")
END IF
NEXT COUNTER
%>
<asp:Table runat="server" GridLines="both" BorderWidth="1px">
<asp:TableRow>
<asp:TableCell>Hello</asp:TableCell>
<asp:TableCell>Konnichi Wa</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>Goodnight</asp:TableCell>
<asp:TableCell>Oyasumi</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>The Time is:</asp:TableCell>
<asp:TableCell><%=now()%></asp:TableCell>
</asp:TableRow>
</asp:Table>
</form>
</body></html>
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a $20 tip buys his kid Hitoshi a new computer game,
a $39 tip buys his daughter Michiko a few nice outfits.
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