ASP.NET PDF Viewer using C#, VB/NET

In the Index view, we want to loop D through all of the Products in the model, displaying a row for each Product With Web Forms, we d need to put in <% %> code blocks for our for loop, but with Spark we have cleaner options First, we use the <viewdata /> B element to tell Spark that we re using a strongly typed view, and our model type is an array of Products Spark also supports the key-based ViewData dictionary Next, we create a local styles variable with the <var /> element C Each attribute name becomes a new local variable, and the attribute value is the value assigned These two variables will help us create alternating row styles Next, we put normal HTML in our view, including a header, table, and header row.

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a customer entity and an account entity would have a multiplicity of 1 at the customer end and 0.1 at the account end Finally, there are many-to-many relationships For example, you might have an entity type to represent a standard part such as an M3 bolt, and an entity to represent a part manufacturer Many manufacturers are capable of producing M3 bolts, and most manufacturers produce more than one kind of product To model the relationship of who produces what in the EDM, you could use an association with a multiplicity of * for both ends of the association And in code, both entities would have navigation properties offering collections of objects However, there s an issue with many-to-many relationships in the EF In the database, such a relationship is represented as a separate table, where each row contains two foreign keys, one for each end of the relationship.

If that s all the table contains, the EF will happily let you map this table to an association in the conceptual model, and the navigation properties will work as described However, if the table contains other information, you will end up needing to represent it as an entity in its own right For example, given the product/manufacturer example earlier, it might turn out to be useful to know what product code a particular supplier uses for a particular standard product There s no place for this information to go if you just have navigation properties on the product and manufacturer that point to one another you would need an extra entity type to hold this property that is specific to a particular product/manufacturer combination.

This can get slightly awkward when there are columns in the relationship table that your application doesn t particularly care about, but which the EF insists are mapped because they are nonnullable and don t have default values Your conceptual model would not be able to represent this table as a simple many-to-many association, because that would leave nowhere to map the relationship property (The underlying issue here is the same one that prevents you from omitting certain database columns from your entities) Finally, we ll look at one more feature of the Entity Framework s mapping capabilities: support for inheritance..

With Spark, special Spark XML elements are interspersed with HTML elements, making our view look cleaner without C# s distracting angle brackets After the header row, we create a counter variable to help in the alternating row styles We need to iterate through all the Products in our model, creating a row for each item In Web Forms, this is accomplished with a foreach loop, but in Spark, we need only add an each attribute to the HTML element we want to repeat, giving the snippet of C# code to iterate in each attribute s value The class element in our row element is set to an alternating style, using a counter to switch between odd and even styles Inside our row, we use the ${} syntax to display each individual product.

Inheritance presents a challenge for an ORM, because the typical object-oriented notions of inheritance don t have any direct parallel in the relational model. Various solutions exist because there isn t one really good way to do this. The Entity Framework supports mappings for a couple of the popular approaches for attempting to bridge this chasm. While there are several approaches to mapping (which we ll get to shortly), the conceptual model s handling of inheritance works the same way in all cases, and is very similar to inheritance in C#. Any entity type can optionally specify one other entity

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