摘要：
CodeSmith允许我们存储元数据在XML文件中，然后在执行模版时直接打开XML文件填写到属性面板中。CodeSmith允许我们将元数据存储在XML文件中，然后在执行模板时直接打开XML文件以填充属性面板。˃267891017＜xs:complexType＞18＜xs:attributename=“ItemNumber”type=“xs:string”use=“required”/˃19＜xs:aattributename:“Quantity”type=”xs:integer“use=“required”/˃20＜/xs:complexType＞21＜/xs:element˃22＜/xs:sequence＞23＜/xs:complexType＞24＜/xs:element＞25＜/xs:-sequence＞26＜/xs:compactType＞27＜/xs:：element＞28＜/xs:schema＞2930这是XMLProperty与schema的一个简单示例：使用这是一个很好的例子这个Schema文件，我们可以定义一个XMLProperty来在运行时读取元数据。PackingListref:PO#发货地址：，内容：，数量.Quantity%˃在运行时，PurchaseOrder属性在属性面板中显示为按钮。单击后，将弹出一个对话框，供用户选择XML文件。选择XML文件。˃2452715约翰尼尔森6Gamoneta7MS89101112131415生成的代码如下：PackingListref:PO#5271ShipTo:JohnNelson Gamoneta，MSContents:HM85，Quantity12JR82，Quantity4PR43，Quantity62.XMLPropertyWithoutaSchema这是一个没有Schema的XMLProperty示例。
1．XML Property With a Schema
1
<?xml version="1.0" encoding="UTF-8"?>
2<xs:schema targetNamespace=http://www.codesmithtools.com/PO
3 xmlns:xs=http://www.w3.org/2001/XMLSchema
4 xmlns=http://www.codesmithtools.com/PO
5 elementFormDefault="qualified" attributeFormDefault="unqualified">
6 <xs:element name="PurchaseOrder">
7 <xs:complexType>
8 <xs:sequence>
9 <xs:element name="PONumber" type="xs:string"/>
10 <xs:element name="CustomerName" type="xs:string"/>
11 <xs:element name="CustomerCity" type="xs:string"/>
12 <xs:element name="CustomerState" type="xs:string"/>
13 <xs:element name="Items">
14 <xs:complexType>
15 <xs:sequence>
16 <xs:element name="Item" maxOccurs="unbounded">
17 <xs:complexType>
18 <xs:attribute name="ItemNumber" type="xs:string" use="required"/>
19 <xs:attribute name="Quantity" type="xs:integer" use="required"/>
20 </xs:complexType>
21 </xs:element>
22 </xs:sequence>
23 </xs:complexType>
24 </xs:element>
25 </xs:sequence>
26 </xs:complexType>
27 </xs:element>
28</xs:schema>
29
30
<?xml version="1.0" encoding="UTF-8"?>2
<xs:schema targetNamespace=http://www.codesmithtools.com/PO3
xmlns:xs=http://www.w3.org/2001/XMLSchema4
xmlns=http://www.codesmithtools.com/PO5
elementFormDefault="qualified" attributeFormDefault="unqualified">6
<xs:element name="PurchaseOrder">7
<xs:complexType>8
<xs:sequence>9
<xs:element name="PONumber" type="xs:string"/>10
<xs:element name="CustomerName" type="xs:string"/>11
<xs:element name="CustomerCity" type="xs:string"/>12
<xs:element name="CustomerState" type="xs:string"/>13
<xs:element name="Items">14
<xs:complexType>15
<xs:sequence>16
<xs:element name="Item" maxOccurs="unbounded">17
<xs:complexType>18
<xs:attribute name="ItemNumber" type="xs:string" use="required"/>19
<xs:attribute name="Quantity" type="xs:integer" use="required"/>20
</xs:complexType>21
</xs:element>22
</xs:sequence>23
</xs:complexType>24
</xs:element>25
</xs:sequence>26
</xs:complexType>27
</xs:element>28
</xs:schema>29
30
这是一个简单的带有Schema的XML Property的例子：
利用这个Schema文件，我们可以定义一个XML Property来在运行时读去元数据。
<%@ CodeTemplate Language="C#" TargetLanguage="Text" Description="Create packing list from XML PO." %><%@ XmlProperty Name="PurchaseOrder" Schema="PO.xsd" Optional="False" Category="Data" Description="Purchase Order to generate packing list for." %>Packing Listref: PO#<%= PurchaseOrder.PONumber %>Ship To:<%= PurchaseOrder.CustomerName %><%= PurchaseOrder.CustomerCity %>, <%= PurchaseOrder.CustomerState %>Contents:
<% for (int i = 0; i < PurchaseOrder.Items.Count; i++) 
{ %>
<%= PurchaseOrder.Items[i].ItemNumber %>, Quantity <%= PurchaseOrder.Items[i].Quantity %>
<% } %>在运行时，PurchaseOrder属性在属性面板中显示为按钮，单击后弹出一个对话框供用户选择XML文件。
选择一个XML文件。在该例子XML文件内容如下：
1<?xml version="1.0" encoding="UTF-8"?>
2<PurchaseOrder xmlns=http://www.codesmithtools.com/PO
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
4 <PONumber>5271</PONumber>
5 <CustomerName>John Nelson</CustomerName>
6 <CustomerCity>Gamonetta</CustomerCity>
7 <CustomerState>MS</CustomerState>
8 <Items>
9 <Item ItemNumber="HM85" Quantity="12"/>
10 <Item ItemNumber="JR82" Quantity="4"/>
11 <Item ItemNumber="PR43" Quantity="6"/>
12 </Items>
13</PurchaseOrder>
14
15
<?xml version="1.0" encoding="UTF-8"?>2
<PurchaseOrder xmlns=http://www.codesmithtools.com/PO3
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">4
<PONumber>5271</PONumber>5
<CustomerName>John Nelson</CustomerName>6
<CustomerCity>Gamonetta</CustomerCity>7
<CustomerState>MS</CustomerState>8
<Items>9
<Item ItemNumber="HM85" Quantity="12"/>10
<Item ItemNumber="JR82" Quantity="4"/>11
<Item ItemNumber="PR43" Quantity="6"/>12
</Items>13
</PurchaseOrder>14
15
生成后的代码如下：
Packing Listref: PO#5271Ship To:John NelsonGamonetta, MSContents:HM85, Quantity 12JR82, Quantity 4PR43, Quantity 62．XML Property Without a Schema
这是一个不带Schema的XML Property的例子。这个模版在运行时可以访问任何XML文件。
<%@ CodeTemplate Language="VB" TargetLanguage="Text" Description="List top-level nodes in an XML file." %><%@ XmlProperty Name="TargetFile" Optional="False" Category="Data" Description="XML file to iterate." %><%@ Assembly Name="System.Xml" %><%@ Import Namespace="System.Xml" %>Top-level nodes:<% Dim currNode as XmlNodecurrNode = TargetFile.DocumentElement.FirstChildDo Until currNode Is Nothing%> <%= currNode.InnerXml %><% currNode = currNode.NextSibling()Loop %>概莫版对目标文件的属性并没有定义一个Schema，所以属性在模版中是作为一个XMLDocument。如果我们选择的XML文件如下所示：
1<?xml version="1.0" encoding="UTF-8"?>
2<Books>
3 <Book>UML 2.0 In a Nutshell</Book>
4 <Book>The Best Software Writing</Book>
5 <Book>Coder to Developer</Book>
6 <Book>Code Complete</Book>
7</Books>
<?xml version="1.0" encoding="UTF-8"?>2
<Books>3
<Book>UML 2.0 In a Nutshell</Book>4
<Book>The Best Software Writing</Book>5
<Book>Coder to Developer</Book>6
<Book>Code Complete</Book>7
</Books>生成后的代码：
Top-level nodes:UML 2.0 In a NutshellThe Best Software WritingCoder to DeveloperCode Complete