使用T4模板创建一个例子

1、创建项目，添加新项，名称处填写Messages.tt，如下图：

添加后，Messages.tt文件内容如下：

 <#@ template debug="false" hostspecific="false" language="C#" #>

 <#@ output extension=".txt" #>

2、创建一个实体对象MessageEntry，用以传递模版信息，具体代码如下：

     public class MessageEntry

     {

         public string Id { get; private set; }

         public string Value { get; private set; }

         public string Category { get; private set; }

         public MessageEntry(string id, string value, string category)

         {

             this.Id = id;

             this.Value = value;

             this.Category = category;

         }

         public string Format(params object[] args)

         {

             return string.Format(this.Value, args);

         }

     }

MessageEntry.cs

3、新建文件Messages.xml，用以配置要生成的信息：

 <?xml version="1.0" encoding="utf-8" ?>

 <messages>

     <message id="MandatoryField" value="The {0} is mandatory." category="Validation"/>

     <message id="GreaterThan" value="The {0} must be greater than {1}." category="Validation"/>

     <message id="ReallyDelete" value="Do you really want to delete the {0}." category="Confirmation"/>

     <message id="UserInfo" value="Do you really want to delete the {0}." category="UserItemInfo"/>

 </messages>

Messages.xml

4、修改Messages.tt文件如下：

 <#@template debug="false" hostspecific="true" language="C#"#>

 <#@assembly name="System.Core.dll"#>

 <#@assembly name="System.Xml"#>

 <#@import namespace="System"#>

 <#@import namespace="System.Xml"#>

 <#@import namespace="System.Linq"#>

 <#@output extension=".cs" #>

 namespace MessageCodeGenrator

 {

     using System;

     public static class Messages

     {

         <# XmlDocument messageDoc = new XmlDocument();

             messageDoc.Load(this.Host.ResolvePath("Messages.xml"));

             var messageEntries = messageDoc.GetElementsByTagName("message").Cast<XmlElement>();

             var categories = (from element in messageEntries

                             select element.Attributes["category"].Value).Distinct();

             foreach (var category in categories)

             {#>

         public static class <#=  category#>

         {

             <#

             foreach (var element in messageDoc.GetElementsByTagName("message").Cast<XmlElement>().Where(element => element.Attributes["category"].Value == category))

             {

                 string id = element.Attributes["id"].Value;

                 string value = element.Attributes["value"].Value;

                 string categotry = element.Attributes["category"].Value;

             #>

             public static MessageEntry <#= id #> = new MessageEntry("<#= id #>","<#= value#>","<#= categotry#>");

         <#}#>

 }

     <#}#>

 }

 }

Messages.tt

5、右键点击Messages.tt，选择运行自定义工具，如下：

6、执行完后，查看Messages.cs文件，可以看到已经生成了所需要的代码：

 namespace MessageCodeGenrator

 {

     using System;

     public static class Messages

     {

         public static class Validation

         {

             public static MessageEntry MandatoryField = new MessageEntry("MandatoryField","The {0} is mandatory.","Validation");

             public static MessageEntry GreaterThan = new MessageEntry("GreaterThan","The {0} must be greater than {1}.","Validation");

         }

         public static class Confirmation

         {

             public static MessageEntry ReallyDelete = new MessageEntry("ReallyDelete","Do you really want to delete the {0}.","Confirmation");

         }

         public static class UserItemInfo

         {

             public static MessageEntry UserInfo = new MessageEntry("UserInfo","Do you really want to delete the {0}.","UserItemInfo");

         }

     }

 }

Messages.cs

巴特西

使用T4模板创建一个例子

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