Code On Time: Tips and Tricks

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Tips and Tricks

Saturday, March 27, 2010Print Subscribe

Integrating ELMAH in Code OnTime Projects

Q. I have another question. I just implemented ELMAH into my solution and
am having some difficulty because every time I use the designer and
regenerate the solution the Elmah configuration entries get
overwritten in Web.Config. I'm sure others have run into this before.
How would you suggest I remediate this issue?

Arthur Djavairian

A. You can configure the project to execute custom Web.Config modification instructions as described at /blog/2010/03/customizing-webconfig.html.

ELMAH (Error Logging Modules and Handlers) is an application-wide error logging facility that is completely pluggable. It can be dynamically added to a running ASP.NET web application, or even all ASP.NET web applications on a machine, without any need for re-compilation or re-deployment.

Arthur has shared with us his configuration settings.

The following is the markup to add ELMAH error logging to a Code OnTime project. Make sure to copy the instructions including the text in bold.

AppendChild: /configuration/configSections

              <sectionGroup name="elmah">
                       
                       <section name="security" requirePermission="false" type="Elmah.SecuritySectionHandler, Elmah"/>
                       <section name="errorLog" requirePermission="false" type="Elmah.ErrorLogSectionHandler, Elmah"/>
                       <section name="errorMail" requirePermission="false" type="Elmah.ErrorMailSectionHandler, Elmah"/>
                       <section name="errorFilter" requirePermission="false" type="Elmah.ErrorFilterSectionHandler, Elmah"/>
                       <section name="errorTweet" requirePermission="false" type="Elmah.ErrorTweetSectionHandler, Elmah"/>
               </sectionGroup>

InsertAfter: /configuration/connectionStrings

       <elmah>
               <security allowRemoteAccess="1"/>
               
               <errorLog type="Elmah.SqlErrorLog, Elmah" connectionStringName="SimplePaymentPlans"/>
       </elmah>

AppendChild: /configuration/system.web/httpHandlers

AppendChild: /configuration/system.web/httpModules

<add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>

AppendChild: /configuration

   <location path="elmah.axd">
       <system.web>
           <authorization>
               <allow roles="Administrators"/>
               <deny users="*" />
           </authorization>
       </system.web>
   </location>

Labels: Application Factory, ASP.NET 3.5, ASP.NET Code Generator, Tips and Tricks, Web.Config

Sunday, March 7, 2010Print Subscribe

How do I display a path stored in a field as an image?

Question:

Do you have an example of how we can display the image by using the DataFormatString and HTMLEncode? Basically, our database has a field "photo_url" which store the path to the photo in the file system. Can it behave like an image field in terms of presentation?

Please try the following:

1. Start the code generator, click on the name of your project and press "Design" button, select the data controller name and add a new field to the data controller.

2. If the name of the image field is "PhotoPath" then name the new field "PhotoPathImage".

3. Set the type of the new field to "String".

4. Set "Allow null values." to true.

5. Check "The value of the field is computed at runtime" and enter the same snippet from the data controller's command command1 that selects the actual field "PhotoPath". For example, the Northwind's database Employees.PhotoPath will look as follows:

"Employees"."PhotoPath".

6. Assign a label to the new field. For example, "Photo Path"

7. Uncheck HTML encoding.

8. Enter <img src="{0}"/> as a data format string.

9. Save the field.

10. Add a new data field to grid1 or editForm1 and set its FieldName to PhotoPathImage.

The field will be presented as an image.

Labels: Data Aquarium Framework, Designer, Tips and Tricks, User Interface