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[Solved] Grid Column Scaffolding And DataAnnotations

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Jason Tully asked on 23 Feb 2010, 03:18 PM

Does the ASP,NET MVC Grid support column scaffolding and data annotations?

We are building a product that uses Html.DisplayForModel() and Html.EditorForModel() to automatically render our views from the underlying Model. Annotations are provided by registering a custom type descriptor provider for our model types and calling TypeDescriptor.GetProperties( ) for the current model instance. (Both Html.DisplayForModel and EditorForModel build their respective UI's by this method). Is there a way to make the grid annotation aware when auto generating columns from the Model? Ideally, we would like to be able to specify the column's header using an annotation as well as the visibility of the column, add/edit/delete buttons etc...

Thanks

Jason T

5 Answers, 1 is accepted

answered on 23 Feb 2010, 03:24 PM

Hi Jason Tully,

The Q1 2010 Futures has some preliminary support for DisplayFor and EditorFor. Both are used for rendering the grid records in display and edit mode. The column header should also be datannotations aware. The only thing which will not work is command columns because they are created as a Command column.

I suggest you download the futures build and give it a spin. We will appreciate your feedback.

All the best,
Atanas Korchev
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.

answered on 23 Feb 2010, 05:16 PM

I think I discovered a bug. Looking at the source code for GridBoundColumn i noticed that even though the MVC2 code section was executing, the Title of the field was always being set using memberExpression.Member.Name.SplitPascalCase(); I changed the compilation directives as seen below and everything began working correctly. I have the ScaffoldColumn attribute set to false for columns I wish to hide and the DisplayNameAttribute set to the text I want displayed as the column header. Is there a way to order the columns as well? In our annotation framework, we have an Order property and I order the collection of properties returned from TypeDescriptor.GetProperites using this value. How does the Grid reflect the list of properties to display?

                    #if MVC2         
                        Metadata = ModelMetadata.FromLambdaExpression(expression, new ViewDataDictionary<TModel>());         
                        Title = Metadata.DisplayName;         
                        Format = Metadata.DisplayFormatString;         
                        Visible = Metadata.ShowForDisplay;         
            #else         
                     
                        MemberExpression memberExpression = expression.ToMemberExpression();         
                                 
                        if (memberExpression == null)         
                        {         
                            throw new InvalidOperationException("Only property and field expressions are supported");         
                        }         
                     
                        MemberInfo member = memberExpression.Member;         
                     
                        if (member.MemberType == MemberTypes.Property || member.MemberType == MemberTypes.Field)         
                        {         
                            Title = member.GetDisplayName();         
                            Format = member.GetFormat();         
                        }         
                     
                        if (string.IsNullOrEmpty(Title))         
                        {         
                            Title = memberExpression.Member.Name.SplitPascalCase();         
                        }         
            #endif         