现有Momoda.Api项目，由于团队所有人在此项目下开发，导致耦合度太高，现从此接口项目中拆分出多个子项目从而避免对Momda.Api的改动导致“爆炸”
MVCApi的跨项目路由和MVC有解决方式有点不同
第一步：
首先在Momoda下创建域创建好之后把生成的YZCAreaRegistration文件移动到Areas目录下YZC目录外，然后排除YZC文件夹，像这样：
第二步：
创建一个新的MVCApi叫 YZC.WebAi,在资源管理器中用 YZC.WebAi文件夹下的内容替换掉Areas下的YZC域文件夹中的内容，并且只留下Controllers,Views和Models三个文件夹，其他的config和Global等都删除
第三步：
右键LYL解决方案添加现有项目在YZC域下找到工程文件 （ \LYL\Momoda.Api\Areas）
这样就把Momoda.Api下的YZC域给拆分出来，开发过程中只关注YZC.WebApi即可，目录结构如下图：
第四步：
更改YZCAreaRegistration域路由文件。
Api路由文件的更改是否和MVC跨域路由一样添加context.MapRoute方法的最后一个命名空间参数就能解决呢？答案当然没有那么简单。。。。。哈哈哈哈
我们现验证以下是否按照MVC跨项目路由的解决方案也同样适用于Api。
更改父API项目的域路由文件：
public override void RegisterArea(AreaRegistrationContext context)
{
context.MapRoute(
"YZC_default",
"YZC/{controller}/{action}/{id}",
new { action = "Index", id = UrlParameter.Optional },
new string[] { "YZC.Controllers" }//添加域项目的控制层命名空间
);
}
在子api项目中添加controller：
{
public class ChildrenController : ApiController
{
#region 跨项目路由测试
[HttpGet]
public string Test()
{
return "小良哥";
}
#endregion
}
}
浏览器中测试结果：
没有路由到，表明MVC域的处理和Api域的处理是不同的
解决方案：
在父ApiMomoda.Api下的App_Start中新增叫CustomHttpControllerSelector的类并且继承DefaultHttpControllerSelector
代码如下：
/// <summary>
/// 自定义区域类
/// </summary>
public class CustomHttpControllerSelector: DefaultHttpControllerSelector
{
private const string NamespaceRouteVariableName = namespaceName";
//namespaceName之后要用到
//private const string AreaRouteVariableName = "area";
private readonly HttpConfiguration _configuration;
private readonly Lazy<ConcurrentDictionary<string, Type>> _apiControllerCache; public CustomHttpControllerSelector(HttpConfiguration configuration)
: base(configuration)
{
_configuration = configuration; _apiControllerCache = new Lazy<ConcurrentDictionary<string, Type>>(
new Func<ConcurrentDictionary<string, Type>>(InitializeApiControllerCache));
} private ConcurrentDictionary<string, Type> InitializeApiControllerCache()
{
IAssembliesResolver assembliesResolver = this._configuration.Services.GetAssembliesResolver();
var types = this._configuration.Services.GetHttpControllerTypeResolver()
.GetControllerTypes(assembliesResolver).ToDictionary(t => t.FullName, t => t); return new ConcurrentDictionary<string, Type>(types);
} public IEnumerable<string> GetControllerFullName(HttpRequestMessage request, string controllerName)
{
object namespaceName;
var data = request.GetRouteData();
IEnumerable<string> keys = _apiControllerCache.Value.ToDictionary<KeyValuePair<string, Type>, string, Type>(t => t.Key,
t => t.Value, StringComparer.OrdinalIgnoreCase).Keys.ToList(); if (!data.Values.TryGetValue(NamespaceRouteVariableName, out namespaceName))
{
return from k in keys
where k.EndsWith(string.Format(".{0}{1}", controllerName,
DefaultHttpControllerSelector.ControllerSuffix), StringComparison.OrdinalIgnoreCase)
select k;
} string[] namespaces = (string[])namespaceName;
return from n in namespaces
join k in keys on string.Format("{0}.{1}{2}", n, controllerName,
DefaultHttpControllerSelector.ControllerSuffix).ToLower() equals k.ToLower()
select k;
} public override HttpControllerDescriptor SelectController(HttpRequestMessage request)
{
Type type;
if (request == null)
{
throw new ArgumentNullException("request");
} string controllerName = this.GetControllerName(request);
if (string.IsNullOrEmpty(controllerName))
{
throw new HttpResponseException(request.CreateErrorResponse(HttpStatusCode.NotFound,
string.Format("No route providing a controller name was found to match request URI '{0}'",
new object[] { request.RequestUri })));
} IEnumerable<string> fullNames = GetControllerFullName(request, controllerName);
if (fullNames.Count() == )
{
throw new HttpResponseException(request.CreateErrorResponse(HttpStatusCode.NotFound,
string.Format("No route providing a controller name was found to match request URI '{0}'",
new object[] { request.RequestUri })));
} if (!this._apiControllerCache.Value.TryGetValue(fullNames.First(), out type))
{
throw new HttpResponseException(request.CreateErrorResponse(HttpStatusCode.NotFound,
string.Format("No route providing a controller name was found to match request URI '{0}'",
new object[] { request.RequestUri })));
} return new HttpControllerDescriptor(_configuration, controllerName, type);
}
}
更改父API项目的域路由文件为：
namespace Momoda.Api
{
public class YZCAreaRegistration : AreaRegistration
{
public override string AreaName//域名称
{
get
{
return "YZC";
}
}
public override void RegisterArea(AreaRegistrationContext context)
{
context.Routes.MapHttpRoute(
name: this.AreaName + "_default",
routeTemplate: "api/" + this.AreaName + "/{controller}/{action}/{id}",
defaults: new
{
id = RouteParameter.Optional,
namespaceName = new string[] { string.Format("{0}.Controllers",this.AreaName) }
//namespaceName名称要CustomHttpControllerSelector中NamespaceRouteVariableName的值一致
}
);
}
}
}
这样就完成了吗？没有！！！必须把域YZC.WebApi生成路径设置为Momoda.Api的bin文件下
测试结果：
成功！
域名称可加可不加同样成功
17:57:11，嘿嘿，下班啦