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Customizing the XML Representation The schema of the DataSet object's XML representation is not set in stone and can be modified to some extent. In particular, each column in each DataTable object can specify how the internal serializer should render its content. By default, each column is rendered as an element, but this feature can be changed to any of the values in the MappingType enumeration. The DataColumn property that specifies the mapping type is ColumnMapping. Customizing Column Mapping Each row in a DataTable object originates an XML subtree whose structure depends on the value assigned to the DataColumn object's ColumnMapping property. Table 9-3 lists the allowable column mappings.

When you insert a field in your document, you will see the contents of the field rather than the field code. But sometimes it is helpful to see the field code rather than its contents. To view the code for a single field, select the field and press Shift+F9. To show the codes for all the fields in the document, press Alt+F9. These hotkeys work as toggles. You may also want to apply shading to the fields in your document. This will help you distinguish them easily from the rest of your document. To do so, click Tools Options. Open the View tab. In the drop-down box labeled Field shading, select Never, Always, or When selected. Click OK. With shading enabled, fields will contain a pale gray border on the computer screen.

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Table 9-3: The MappingType Enumeration Mapping Description Attribute The column is mapped to an XML attribute on the row node. Element The column is mapped to an XML node element. The default setting. 333

Figure 9-4. Drag the Office Spreadsheet Web Part from the gallery and drop it in a zone on the web part page.

Table 9-3: The MappingType Enumeration Mapping Description Hidden The column is not included in the XML output unless the DiffGram format is used SimpleContent The column is mapped to simple text (Only for tables containing exactly one column) The column data depends on the row node If ColumnMapping is set to Element, the column value is rendered as a child node, as shown here: <Table> <Column>value</Column> </Table> If ColumnMapping is set to Attribute, the column data becomes an attribute on the row node, as shown here: <Table Column="value"> </Table> By setting ColumnMapping to Hidden, you can filter the column out of the XML representation Unlike the two preceding settings, which are maintained in the DiffGram format, a column marked with Hidden is still serialized in the DiffGram format, but with a special attribute that indicates that it was originally marked hidden for serialization.

The reason is that the DiffGram format is meant to provide a stateful and high-fidelity representation of the DataSet object Finally, the SimpleContent attribute renders the column content as the text of the row node, as shown here: <Table>value</Table> For this reason, this attribute is applicable only to tables that have a single column Persisting Extended Properties Many ADONET classes, including DataSet, DataTable, and DataColumn, use the ExtendedProperties property to enable users to add custom information Think of the ExtendedProperties property as a kind of generic cargo variable similar to the Tag property of many ActiveX controls You populate it with name/value pairs and manage the contents using the typical and familiar programming interface of collections For example, you can use the DataTable object's ExtendedProperties collection to store the SQL command that should be used to refresh the table itself.

If you decide you don t like where the web part ended up, you can move it to another zone or position within a zone. Point to the title bar of the web part, and when the pointer changes to a four-headed arrow, click and drag the web part to another location.

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The set of extended properties is lost at serialization time, unless you choose to add schema information The WriteXml method adds extended properties to the schema using an ad hoc attribute prefixed with the msprop namespace prefix Consider the following code: dsTables["Employees"]ExtendedPropertiesAdd("Command", EmployeesCommandText); dsTables["Territories"]ExtendedPropertiesAdd("Command", TerritoriesCommandText); 334.

Note In the case of web part pages, Header and Footer don t have the conventional significance, such as

When the tables are serialized, the Command slot is rendered as follows: <xs:element name="Employees" msprop:Command=".."> <xs:element name="Territories" msprop:Command=".."> ExtendedProperties holds a collection of objects and can accept values of any type, but you might run into trouble if you store values other than strings there When the object is serialized, any extended property is serialized as a string In particular, the string is what the object's ToString method returns This can pose problems when the DataSet object is deserialized Not all types can be successfully and seamlessly rebuilt from a string For example, consider the Color class If you call ToString on a Color object (say, Blue), you get something like Color [Blue] However, no constructor on the Color class can rebuild a valid object from such a string For this reason, pay careful attention to the nonstring types you store in the ExtendedProperties collection.

Rendering Data Relations A DataSet object can contain one or more relations gathered under the Relations collection property A DataRelation object represents a parent/child relationship set between two DataTable objects The connection takes place on the value of a matching column and is similar to a primary key/foreign key relationship In ADONET, the relation is entirely implemented in memory and can have any cardinality: one-to-one, one-to-many, and even many-to-one More often than not, a relation entails table constraints In ADONET, you have two types of constraints: foreign-key constraints and unique constraints A foreign-key constraint denotes an action that occurs on the columns involved in the relation when a row is either deleted or updated A unique constraint denotes a restriction on the parent column whereby duplicate values are not allowed How are relations rendered in XML If no schema information is required, relations are simply ignored.

a location where page numbering or date and time appear on a hard copy of an Excel worksheet. On a web part page, the terms merely refer to zones at the top and bottom of the page. The Header and Footer zones span the width of a web part page, so use them for web parts that are too wide to display in the left, center, and right zones.

When a schema is not explicitly required, the XML representation of the DataSet object is a plain snapshot of the currently stored data; any ancillary information is ignored There are two ways to accurately represent a DataRelation relation within an XML schema: you can use the <msdata:Relationship> annotation or specify an <xs:keyref> element The WriteXml procedure uses the latter solution The msdata:Relationship Annotation The msdata:Relationship annotation is a Microsoft XSD extension that ADONET and XML programmers can use to explicitly specify a parent/child relationship between nonnested tables in a schema This annotation is ideal for expressing the content of a DataRelation object In turn, the content of an msdata:Relationship annotation is transformed into a DataRelation object when ReadXml processes the XML file Let's consider the following relation: DataRelation rel = new DataRelation("Emp2Terr", dsTables["Employees"]Columns["employeeid"], dsTables["Territories"]Columns["employeeid"]); dsRelations.

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