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GridView with Edit Form (Template)

, 12 Feb 2008
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Comfort editing of a GridView row.

Introduction

When I got my new job, I found out that developers there were still thinking in .NET 1.1, so they used old methods or directly edited HTML in Render methods. One of the controls made in this terrible way was a GridView that used an edit form instead of a classic edit row, and I wanted to make it the new (and I hope, also the right) way.

Background

Let's start designing:

  1. Get an ITemplate (bindable) of the edit form
  2. Insert the template into the row instead of default cells with inputs
  3. Extract the values on postback and use them to update the data source

Points of interest

The control itself is not complicated, so I will not describe all the code, I'll mention only the interesting parts.

  1. I needed a bindable template that can extract the entered values back, so I used the IBindableTemplate and used it as the property.
  2. [PersistenceMode(PersistenceMode.InnerProperty), 
        TemplateContainer(typeof(GridViewRow), 
        System.ComponentModel.BindingDirection.TwoWay)]
    public IBindableTemplate EditItemTemplate
    {
         set { _EditItemTemplate = value; }
         get { return _EditItemTemplate; }
    }

    The interesting thing about this snippet is the attribute. Ordinary ITemplates provide only one way, so we can not extract the inserted values back, that's why I used the IBindableTemplate and declared two way binding direction in the attribute.

  3. And, the second thing is extracting the values:
  4. protected override void ExtractRowValues(
        System.Collections.Specialized.IOrderedDictionary fieldValues, 
        GridViewRow row, bool includeReadOnlyFields, bool includePrimaryKey)
    {
          if (_EnableTemplateEditing)
          {
              // Not working
              // fieldValues = _EditItemTemplate.ExtractValues(row.Cells[0]);
            
              // Working
              IOrderedDictionary dict = _EditItemTemplate.ExtractValues(row.Cells[0]);
              foreach (string s in dict.Keys)
                  fieldValues.Add(s, dict[s]);
          }
          else
               base.ExtractRowValues(fieldValues, row, includeReadOnlyFields, 
                   includePrimaryKey);
    }

    The strange thing is that you can not assign the IOrderedDictionary you get from the template to the fieldValues object even if fieldValues is empty. You have to add the values key by key, as shown.

To enable template editing, don't forget to set the EnableTemplateEditing property to true.

History

  • 2/9/2008 - First version.
  • 2/12/2008 - Download added.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Lukas Holota
Web Developer Barclays Capital
Czech Republic Czech Republic
- .NET Developer, currently working for Barclays Capital
- Student of Czech Technical University in Prague - Faculty of information technologies

Comments and Discussions

 
GeneralHow would you populate a dropdown? Pinmembersacredspirita16-Jun-11 2:17 
GeneralDB is missing from the download Pinmembersacredspirita16-Jun-11 2:05 
GeneralRe: DB is missing from the download Pinmembersacredspirita16-Jun-11 2:16 
GeneralUserControl as Edit Form PinmemberRaYWoLF6-Apr-09 22:12 
GeneralRe: UserControl as Edit Form PinmemberLukas Holota9-Jun-09 9:25 
Generalnot saving changes for me Pinmemberblestab6-Oct-08 0:05 
AnswerRe: not saving changes for me PinmemberLukas Holota6-Oct-08 1:01 
GeneralGridView with Edit Form (Template) PinmemberDinesh N Samarathunga29-May-08 17:46 
GeneralRe: GridView with Edit Form (Template) PinmemberLukas Holota29-May-08 21:51 

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