【发布时间】：2015-07-28 07:23:48
【问题描述】：
我有一个 c# 应用程序，它公开了一个 API（通过 WebAPI 或 WCF）和一个用于合同的单独 dll。合约 dll 由 NuGet 公开，以便调用者在调用应用程序时可以使用合约对象。
但是，合同类使用自定义验证属性进行修饰，其中许多都依赖于存储库 dll 等，我不想将其包含在合同 NuGet 中。我基本上想发布合同的简化形式，我可以接收它并将其反序列化为原始合同对象（如果需要，使用 ValueInjecter）。
我无法找到开箱即用的解决方案，因此我开始编写一个 t4 转换文件来运行合同程序集并创建新的、简化的类，而无需所有验证属性。这变得非常乏味，我希望有人有更好的解决方案。我很难相信我是第一个遇到这个问题的人。
编辑：感谢您的反馈。目前，我编写的 T4 运行良好，只生成了我需要的简单类。好在虽然调用者发送的是简化类，但它被反序列化为原始类。
我在下面包含了基本 .ttinclude 文件的代码：
<#@ assembly name="System.Core" #>
<#@ assembly name="System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" #>
<#@ assembly name="System.Xml" #>
<#@ import namespace="Microsoft.VisualStudio.TextTemplating" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.IO" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ import namespace="System.Reflection" #>
<#@ import namespace="System.Text"#>
<#@ include file="EF.Utility.CS.ttinclude"#>
<#+
private class DtoGenerator
{
private static readonly Lazy<System.Resources.ResourceManager> ResourceManager =
new Lazy<System.Resources.ResourceManager>(
() => new System.Resources.ResourceManager("System.Data.Entity.Design", typeof(MetadataItemCollectionFactory).Assembly), isThreadSafe: true);
private readonly TextTransformation textTransform;
private readonly EntityFrameworkTemplateFileManager fileManager;
private readonly ITextTemplatingEngineHost Host;
public DtoGenerator(object textTransform, ITextTemplatingEngineHost host)
{
this.textTransform = textTransform as TextTransformation;
this.fileManager = EntityFrameworkTemplateFileManager.Create(textTransform);
this.Host = host;
}
public void Write(string text)
{
this.textTransform.Write(text);
}
public void Generate(string folderName, string assemblyName)
{
var inputAssembly = GetAssembly(folderName, assemblyName);
if (inputAssembly == null)
{
Write("// No assembly found");
return;
}
var classes = new Dictionary<Type, string>();
var types = inputAssembly.GetTypes()
.Where(type => type.GetCustomAttributes(false).Any(o => o.GetType().Name == "GenerateDtoAttribute")) //This is a custom attribute that marks classes to be generated
.ToList();
if (!types.Any())
{
Write("// No types found");
return;
}
foreach (var type in types)
{
var baseExtension = "";
var baseClass = type.BaseType;
if (baseClass != null && baseClass != typeof(object))
{
baseExtension = @" : " + baseClass;
}
var currentClass = string.Concat(@"
namespace ", type.Namespace, @"
{
public class ", type.Name, baseExtension, @"
{
", WritePublicProperties(type), @"
}
}");
classes.Add(type, currentClass);
}
foreach (var @class in classes)
{
fileManager.StartNewFile(@class.Key.Name + ".cs");
Write(GetHeader());
Write(@class.Value);
}
fileManager.Process();
}
private Assembly GetAssembly(string folderName, string assemblyName)
{
var relativePathTemplate = string.Format(@"..\{0}\bin\{{0}}\{1}.dll", folderName, assemblyName);
string debugPath,
releasePath,
debugRelativePath = string.Format(relativePathTemplate, "debug"),
releaseRelativePath = string.Format(relativePathTemplate, "release");
try
{
debugPath = Path.GetFullPath(Host.ResolvePath(debugRelativePath));
}
catch (FileNotFoundException)
{
debugPath = null;
}
try
{
releasePath = Path.GetFullPath(Host.ResolvePath(releaseRelativePath));
}
catch (FileNotFoundException)
{
releasePath = null;
}
if (debugPath == null && releasePath == null)
{
return null;
}
var debugDllDate = debugPath == null ? DateTime.MinValue : File.GetLastWriteTime(debugPath);
var releaseDllDate = releasePath == null ? DateTime.MinValue : File.GetLastWriteTime(releasePath);
var assemblyDllPath = debugDllDate > releaseDllDate ? debugPath : releasePath;
if (assemblyDllPath == null) return null;
var assembly = Assembly.LoadFrom(assemblyDllPath);
return assembly;
}
private string GetHeader()
{
var header = string.Format(
@"//------------------------------------------------------------------------------
// <auto-generated>
// {0}
//
// {1}
// {2}
// </auto-generated>
//------------------------------------------------------------------------------",
ResourceManager.Value.GetString("Template_GeneratedCodeCommentLine1", null),
ResourceManager.Value.GetString("Template_GeneratedCodeCommentLine2", null),
ResourceManager.Value.GetString("Template_GeneratedCodeCommentLine3", null));
return header;
}
private string WritePublicProperties(Type type)
{
var properties =
type.GetProperties()
.Where(
info => info.DeclaringType == type
&& info.GetMethod != null && info.GetMethod.IsPublic
&& info.SetMethod != null && info.SetMethod.IsPublic)
.ToList();
var propertyStrings = (from propertyInfo in properties
let typeString = GetTypeName(propertyInfo.PropertyType)
select string.Concat(@" public ", typeString, " ", propertyInfo.Name, @" { get; set; }")).ToList();
return string.Join("\r\n", propertyStrings);
}
private string GetTypeName(Type type)
{
if (type.IsGenericType)
return type.ToString().Split('`')[0] + "<" + string.Join(", ", type.GetGenericArguments().Select(GetTypeName).ToArray()) + ">";
return type.ToString();
}
}
#>
【问题讨论】：
标签： c# t4 datacontract