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Showing posts from March, 2009

Eval: Sometimes I like spagheti code

I just discovered some interesting features of the construct <%# Eval() %>. Eval function uses reflection to evaluate a property of a bound object.

I have two classes Product and Category and I want to display the available products in a page, by using a data bound control.

public class Product {
public int ID;
public string Name;
public int Stock;
public DateTime Date;
public Category Category;
} public class Category {
public string Name;
public DateTime Date;
}

In a data template ( ItemTemplate for sample ) I can use the Eval function like:

1. very simple evaluation without using formats
<%# Eval("Name") %> - will output the name
<%# Eval("Stock") %> - will output the stock ( ..and so on )

2. using a format
<%# Eval("Date","{0:yyyy MMM dd}") %> - for sample: 2009 Apr 06
<%# Eval("Stock","{0} items") %> - will output "10 items" if the stock is 10

3. Combining two or more prop…

Using UrlRewritingNet and Elmah together

UrlRewritingNet is an Url rewriting tool for ASP .Net and Elmah is a module for logging unhandled errors.
UrlRewritingNet can set a default location for “directory” requests via defaultPage property in <urlrewritingnet> section. When a file without extension is requested the defaultPage value is appended to the original URL. Elmah provides a handler for getting the errors summary, usually called elmah.axd. This handler also responds to the followings requests: 
/elmah.axd/rss – RSS errors list feed 
/elmah.axd/digestrss – RSS digest 
/elmah.axd/download –  comma separated errors list
/elmah.axd/about – about page 
/elmah.axd/stylesheet – the stylesheet used
/elmah.axd/detail?id=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX – html single error summary 
/elmah.axd/xml?id=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX – xml single  error summary
/elmah.axd/json?id=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX – json single error summary 

These requests are like a request for a file with no extension. This is why the  U…