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When you have a collection, what you actually have is an object that happens to point to many other objects. Compare that to a relational database, where a result set can contain a single record, no records, or multiple records. To interact with a database, you use the Structured Query Language (SQL), which considers everything as a collection. There is no such thing as a single record. (On various database implementations, SQL has been extended to allow interaction with a single record, but the performance hit for doing that is generally high.) The performance in a C# collection is good, but the ease of use is not. C# provides collection classes for managing collections. C# 2.0 introduced a different approach to collections, which solved many of the problems that came up in earlier C# versions. Here, we ll look at managing collections both before and after C# 2.0, which will help you to understand how collections are used.

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4. Add the following code to list_ItemDataBound. (Note that you may also need to import the System.Data namespace, at the beginning of the file, if you haven t referenced it already.) // Executed when each item of the list is bound to the data source protected void list_ItemDataBound(object sender, DataListItemEventArgs e) { // obtain the attributes of the product DataRowView dataRow = (DataRowView) e.Item.DataItem; string productId = dataRow["ProductID"].ToString(); DataTable attrTable = CatalogAccess.GetProductAttributes(productId); // get the attribute placeholder PlaceHolder attrPlaceHolder = (PlaceHolder)e.Item.FindControl ("attrPlaceHolder"); // temp variables string prevAttributeName = ""; string attributeName, attributeValue, attributeValueId; // current DropDown for attribute values Label attributeNameLabel; DropDownList attributeValuesDropDown = new DropDownList(); // read the list of attributes foreach (DataRow r in attrTable.Rows) { // get attribute data attributeName = r["AttributeName"].ToString(); attributeValue = r["AttributeValue"].ToString(); attributeValueId = r["AttributeValueID"].ToString(); // if starting a new attribute (e.g. Color, Size) if (attributeName != prevAttributeName) { prevAttributeName = attributeName; attributeNameLabel = new Label(); attributeNameLabel.Text = attributeName + ": "; attributeValuesDropDown = new DropDownList(); attrPlaceHolder.Controls.Add(attributeNameLabel); attrPlaceHolder.Controls.Add(attributeValuesDropDown); } // add a new attribute value to the DropDownList attributeValuesDropDown.Items.Add(new ListItem(attributeValue, attributeValueId)); } }

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5. Load a list of products to make sure your attributes show up fine (see Figure 6-3).

Managing a Collection Before C# 2.0

Figure 6-3. Testing product attributes 6. Let s now display the list of attributes in the product details page as well. Open Product.aspx and add a placeholder at the end of the control: Price: <asp:Label CssClass="ProductPrice" ID="priceLabel" runat="server" Text="Label"></asp:Label> <asp:PlaceHolder ID="attrPlaceHolder" runat="server"></asp:PlaceHolder> </asp:Content> 7. Switch to Product.aspx.cs, make sure the System.Data namespace is referenced at the beginning of the file, and then modify PopulateControls by adding the following code at the end of the method:

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Before C# 2.0, the main collection classes were stored in the namespace System.Collections. The following are some of the classes and interfaces in that namespace: ArrayList: A general collection that manages all of the referenced objects using an internal array. This class manages the problem of increasing the size of an array. HashTable: A collection class where the individual objects are stored using key/value pairs. In the previous chapter, the indexer was used to retrieve a room grouping based on its identifier. You could use a HashTable to accomplish the same thing. ICollection: An interface implement by ArrayList that provides basic functionality that copies the references to another array. IDictionary: An interface implemented by HashTable that allows a programmer to associate a key with a value. IList: An interface implemented by ArrayList that provides a general-access mechanism for manipulating a collection of items. Queue: A collection that implements the first in, first out (FIFO) mechanism. You could use a queue when you are processing a set of instructions. The first instruction to process would be the first instruction added to the collection. Stack: A collection that implements the last in, first out (LIFO) mechanism. Think of it as a stack of papers. When one piece of paper is laid on top of another, the first piece of paper that is processed is the last piece of paper added to the stack of papers. All of the collection types ArrayList, HashTable, Queue, and Stack implement a way to store a set of types. The difference in the collection types lies in how the individual objects are stored and retrieved from the collection. For examples of using these collection types, see the Learning More About Collection Types section later in this chapter.

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winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417