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System.Format... vs. Databinder.Eval
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Ahmed, Salman
What is the syntax to display a integer and varchar using System.Format?

I heard it is much faster than Databinder.Eval?
Reply to this message...
 
    
Susan Warren
I'll add my 2 cents on this, if you don't mind. I'd be surpised if
"much faster" is really fast enough to be meaningful in most
applications. Yes, DataBinder.Eval uses reflection during databinding,
but if you are output-caching your pages (you should if you can) this is
one-time hit of *milliseconds* amortized over hundreds or thousands of
requests to the page. What you trade for those few milliseconds of
extra performance is cleaner, more maintainable code. Might be worth
considering when you calculate the cost of "optimizing."

That said, here's the code -- in both cases the field value is
substituted for the "{0}" token. Here's a C# example that formats the
Price field from my DataReader as currency. The ":c" specifies the
currency format.

Formatting with DataBinder.Eval() -- optional 3rd param is a format
string:

    <%# DataBinder.Eval (Container.DataItem, "Price", "{0:c}") %>

Formatting without DataBinder.Eval(). Note that the type of a single
row of data from a DataReader is System.Data.Common.DbDataRecord. For
DataSet, it's System.Data.DataRowView. For other data types, it's
something else. The point is that this approach demands that the
developer know a fair bit about the data object she is binding to.

    <%# String.Format("{0:c}",
((System.Data.Common.DbDataRecord)Container.DataItem)["Price"]) %>

There's a ton of information about String.Format and format string in
the docs. The same format strings work in DataBinder.Eval too.

Hth
Susan

-----Original Message-----
From: Ahmed, Salman [mailto:Click here to reveal e-mail address]=20
Sent: Monday, January 21, 2002 6:18 AM
To: aspngspeed
Subject: [aspngspeed] System.Format... vs. Databinder.Eval

What is the syntax to display a integer and varchar using System.Format?

I heard it is much faster than Databinder.Eval?

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Reply to this message...
 
 
System.ComponentModel.Container
System.Data.Common.DbDataRecord
System.Data.DataRowView
System.Data.DataSet
System.String
System.Web.UI.DataBinder




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