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CurrentRows should be the default, and there should be an overridden constructor that omits this argument Since there is not, you provide it here After the constructor finishes its work, you ll have a DataView object with a single row in it, corresponding to the publisher the user has selected in the interface To bind the grid, then, you ll use the CreateChildView method of the DataViewRow class, which allows you to navigate from a row of data in the parent view to its collection of children in a new view that gets created by the method You can pass an instance of a relation to this method, or just name a relation, as you re doing here Another handy facility of the DataSet is the capability to bind a column to an expression You can use this to create simple aggregates across relationships You can add an OrderTotal.

Before we dive headfirst into the top ten to-do list, Figure 7 1 shows a quick overview of the use cases for the Mapplet 2.0 project. As you can see, they re organized into two packages: Displaying and Searching. We ll focus on the Use Address use case (in Searching) in this chapter.

Because the relationship is deleted, referencing the current values will cause an exception As we don t know which end of the relationship is the order and which end is the order status, we test both With the original order status entity in hand, we simply check whether the original OrderStatusId is one less than the new OrderStatusId We created the OrderStatus objects so that their ids would increment by one just to make the code a little easier..

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column to an Orders table that uses a relationship to calculate the total from the OrderItem child table. This example adds an average price column to the DataSet used in the last example, and displays it at the top of the grid when a publisher is chosen. First you add a line of code to the GetSourceData method, just after the relation is created. ds.Tables["Publishers"].Columns.Add( new DataColumn( "AveragePrice", typeof(double), "Avg(Child.price)")); Here you re adding a new DataColumn to the collection of columns for the publisher table. The first two constructor parameters are the name and type of the column. The third is our column expression. This string tells the DataTable to use the relation to get to its child table, and compute an average of all the prices in its collection of child rows. Other simple aggregates are valid in these expressions as well. If there s more than one relation on the parent table, you can also build the relation name into the expression. Avg(Child(Pub_Title).price) You can now use this column to output the average when the user makes a selection from the publisher list. You ve added a label control named lblAvgPrice next to the drop-down list in the markup of the page. The output is then done from the SelectedIndexChanged event trap. if (dv[0]["AveragePrice"] != DBNull.Value) lblAvgPrice.Text = Convert.ToDouble(dv[0]["AveragePrice"]).ToString("C");

Let s say you have an XML column in a table in your database. When you import this table into a model, Entity Framework interpreted the data type as a string rather than XML (see Figure 12-13). The current version of Entity Framework does not expose XML data types from the database. You want to work with this property as if it were an XML data type.

Begin your testing with a use case written in narrative form. If you ve ever used software that s cumbersome, difficult to use, or doesn t seem to work quite right (and all of us have), you re almost certainly using software that didn t start out with somebody writing a good narrative user manual style use case. The easiest way to think about writing narrative style use cases is simply write the user manual before you write the code. Writing the user manual (in use case form) forces developers to think through the user experience in detail before the code gets written. This is important because once the code is written, it s usually too late.

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