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Working with Data Source Controls and Data-Bound Controls
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Sample of C# Code using using using using using System; System.Collections.Generic; System.Linq; System.Web; System.ComponentModel.DataAnnotations;
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[MetadataType(typeof(ProductMetadata))] public partial class Product { } public class ProductMetadata { public object ProductID { get; set; } public object ProductName { get; set; } public object SupplierID { get; set; } public object CategoryID { get; set; } [ScaffoldColumn(false)] public object QuantityPerUnit { get; set; } [DisplayFormat(ApplyFormatInEditMode=false, DataFormatString="{0:c}")] [Display(Name = "Price")] public object UnitPrice { get; set; } [ScaffoldColumn(false)] public object UnitsInStock { get; set; } [ScaffoldColumn(false)] public object UnitsOnOrder { get; set; } [ScaffoldColumn(false)] public object ReorderLevel { get; set; } public object Discontinued { get; set; } }
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When you run the application, this metadata is added to the Product class. Dynamic Data then picks up on this metadata and displays your fields accordingly. Figure 12-27 shows the results in a browser. Notice the missing fields, formatted UnitPrice column, and changed name.
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Lesson 3: Working with ASP.NET Dynamic Data
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FigURE 12-27 Using metadata and partial classes to indicate field display options.
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There are many additional annotations you can add to your metadata from the System. ComponentModel.DataAnnotations namespace. You will see some of these in the upcoming sections. Table 12-1 provides a partial list of these classes (note that all are attribute classes).
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TAbLE 12-1 Commonly Used Metadata Annotation Classes
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Association CustomValidation DataType Display DisplayFormat
Used to mark a property as a data relationship, such as a foreign key. Used to indicate a custom validation method to use for validating a property. Used to indicate the data type to associate with the field. Allows you to indicate many things about the display of a field, including its order and its name. Allows you to change how the data in a field is displayed. You can apply the formatting to affect only the view mode (and not the edit mode) if you want. Used to indicate whether a property can be edited. Allows you to set an enum data type for a property.
Editable EnumDataType
768 ChAPTER 12
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Key MetadataType Range RegularExpression Required ScaffoldColumn ScaffoldTable StringLength UIHint
Allows you to set one or more properties as unique keys for a collection of objects. Used to set the metadata class to associate with a type from your data context. Allows you to add a numeric range constraint to a property. You can also set an error message to be shown if the range is not valid. Used to add a regular expression constraint to a property. Used to indicate that a property is required when inserting or editing. Indicates whether the column should be part of the scaffold (shown). Indicates whether an entire table should be part of the scaffold (shown). Allows you to set a constraint on a property based on the specified minimum and maximum number of characters for a property. Used to specify a custom field user control that should be used to display the property.
Adding Custom Validation
You can see from Table 12-1 that you can use attributes to mark your metadata with specific constraints. These constraints will then be enforced by Dynamic Data, and ASP.NET validation controls will be rendered and invoked. The validation attributes include Range, StringLength, Required, and RegularExpression (among others). You use these controls to enforce additional constraints on your data. For example, suppose you want to add the Range validator to the ReorderLevel property to indicate that users can only reorder stock in quantities of 1 to 144 units. You could do so with the following code.
Sample of Visual Basic Code <Range(1, 144, ErrorMessage:="Quantity must be between 1 and 144")> _ Public Property ReorderLevel As Object Sample of C# Code [Range(1, 144, ErrorMessage = "Quantity must be between 1 and 144")] public object ReorderLevel { get; set; }
This business logic is then processed by Dynamic Data. You can see the results of a row edit in Figure 12-28. Here the user set the ReorderLevel to a value that is out of range (0). You can follow this same construct for other validation attributes, including StringLength and Required. Of course, you can apply more than one attribute to any property.
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