好吧，我决定扩展 Radim 的想法并设计我自己的自定义路由约束（在这个问题中提到。
基本上，我现在没有许多不同的路线，而是只有一条路线可以匹配带有两个整数参数的任何东西：
routes.MapRoute(
name: "Default2",
url: "{controller}/{action}/{param1}-{param2}",
defaults: new { controller = "Admin", action = "Index" },
constraints: new { lang = new CustomRouteConstraint(new RoutePatternCollection( new List<ParamType> { ParamType.INT, ParamType.INT })) }
);
在Application_Start()下面，Global.asax我为约束设置了控制器命名空间（这比每次都试图弄清楚它更有效）：
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
//should be called before RegisterRoutes
CustomRouteConstraint.SetControllerNamespace("********.Controllers");
WebApiConfig.Register(GlobalConfiguration.Configuration);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
}
最后是自定义路由约束（我知道这是一大堆代码，可能过于复杂，但我认为这是不言自明的）：
using System;
using System.Collections.Generic;
using System.Web.Mvc;
using System.Web.Routing;
using System.Web;
using System.Linq;
using System.Reflection;
namespace ********.Code
{
public class CustomRouteConstraint : IRouteConstraint
{
private static string controllerNamespace;
RoutePatternCollection patternCollection { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="CustomRouteConstraint"/> class.
/// </summary>
/// <param name="rPC">The route pattern collection to match.</param>
public CustomRouteConstraint(RoutePatternCollection rPC)
{
this.patternCollection = rPC;
if (string.IsNullOrWhiteSpace(controllerNamespace)) {
controllerNamespace = Assembly.GetCallingAssembly().FullName.Split(new string[1] {","}, StringSplitOptions.None)
.FirstOrDefault().Trim().ToString();
}
}
/// <summary>
/// Sets the controller namespace. Should be called before RegisterRoutes.
/// </summary>
/// <param name="_namespace">The namespace.</param>
public static void SetControllerNamespace(string _namespace)
{
controllerNamespace = _namespace;
}
/// <summary>
/// Attempts to match the current request to an action with the constraint pattern.
/// </summary>
/// <param name="httpContext">The current HTTPContext of the request.</param>
/// <param name="route">The route to which the constraint belongs.</param>
/// <param name="paramName">Name of the parameter (irrelevant).</param>
/// <param name="values">The url values to attempt to match.</param>
/// <param name="routeDirection">The route direction (this method will ignore URL Generations).</param>
/// <returns>True if a match has been found, false otherwise.</returns>
public bool Match(HttpContextBase httpContext, Route route, string paramName, RouteValueDictionary values, RouteDirection routeDirection)
{
if (routeDirection.Equals(RouteDirection.UrlGeneration)) {
return false;
}
Dictionary<string, object> unMappedList = values.Where(x => x.Key.Contains("param")).OrderBy(xi => xi.Key).ToDictionary(
kvp => kvp.Key, kvp => kvp.Value);
string controller = values["controller"] as string;
string action = values["action"] as string;
Type cont = TryFindController(controller);
if (cont != null) {
MethodInfo actionMethod = cont.GetMethod(action);
if (actionMethod != null) {
ParameterInfo[] methodParameters = actionMethod.GetParameters();
if (validateParameters(methodParameters, unMappedList)) {
for (int i = 0; i < methodParameters.Length; i++) {
var key = unMappedList.ElementAt(i).Key;
var value = values[key];
values.Remove(key);
values.Add(methodParameters.ElementAt(i).Name, value);
}
return true;
}
}
}
return false;
}
/// <summary>
/// Validates the parameter lists.
/// </summary>
/// <param name="methodParameters">The method parameters for the found action.</param>
/// <param name="values">The parameters from the RouteValueDictionary.</param>
/// <returns>True if the parameters all match, false if otherwise.</returns>
private bool validateParameters(ParameterInfo[] methodParameters, Dictionary<string, object> values)
{
//@TODO add flexibility for optional parameters
if (methodParameters.Count() != patternCollection.parameters.Count()) {
return false;
}
for (int i = 0; i < methodParameters.Length; i++) {
if (!matchType(methodParameters[i], patternCollection.parameters.ElementAt(i), values.ElementAt(i).Value)) {
return false;
}
}
return true;
}
/// <summary>
/// Matches the type of the found action parameter to the expected parameter, also attempts data conversion.
/// </summary>
/// <param name="actualParam">The actual parameter of the found action.</param>
/// <param name="expectedParam">The expected parameter.</param>
/// <param name="value">The value of the RouteValueDictionary corresponding to that parameter.</param>
/// <returns>True if the parameters match, false if otherwise.</returns>
private bool matchType(ParameterInfo actualParam, ParamType expectedParam, object value)
{
try {
switch (expectedParam) {
case ParamType.BOOL:
switch (actualParam.ParameterType.ToString()) {
case "System.Boolean":
Convert.ToBoolean(value);
return true;
break;
default:
return false;
break;
}
break;
case ParamType.DOUBLE:
switch (actualParam.ParameterType.ToString()) {
case "System.Double":
Convert.ToDouble(value);
return true;
break;
case "System.Decimal":
Convert.ToDecimal(value);
return true;
break;
default:
return false;
break;
}
break;
case ParamType.INT:
switch (actualParam.ParameterType.ToString()) {
case "System.Int32":
Convert.ToInt32(value);
return true;
break;
case "System.Int16":
Convert.ToInt16(value);
return true;
break;
default:
return false;
break;
}
break;
case ParamType.LONG:
switch (actualParam.ParameterType.ToString()) {
case "System.Int64":
Convert.ToInt64(value);
return true;
break;
default:
return false;
break;
}
break;
case ParamType.STRING:
switch (actualParam.ParameterType.ToString()) {
case "System.String":
Convert.ToString(value);
return true;
break;
default:
return false;
break;
}
break;
case ParamType.UINT:
switch (actualParam.ParameterType.ToString()) {
case "System.UInt32":
Convert.ToUInt32(value);
return true;
break;
case "System.UInt16":
Convert.ToUInt16(value);
return true;
break;
default:
return false;
break;
}
break;
case ParamType.ULONG:
switch (actualParam.ParameterType.ToString()) {
case "System.UInt64":
Convert.ToUInt64(value);
return true;
break;
default:
return false;
break;
}
break;
default:
return false;
}
} catch (Exception) {
return false;
}
}
/// <summary>
/// Attempts to discover a controller matching the one specified in the route.
/// </summary>
/// <param name="_controllerName">Name of the controller.</param>
/// <returns>A System.Type containing the found controller, or null if the contoller cannot be discovered.</returns>
private Type TryFindController(string _controllerName)
{
string controllerFullName;
Assembly executingAssembly = Assembly.GetExecutingAssembly();
if (!string.IsNullOrWhiteSpace(controllerNamespace)) {
controllerFullName = string.Format(controllerNamespace + ".Controllers.{0}Controller", _controllerName);
Type controller = executingAssembly.GetType(controllerFullName);
if (controller == null) {
if (controllerNamespace.Contains("Controllers")) {
controllerFullName = string.Format(controllerNamespace + ".{0}Controller", _controllerName);
if ((controller = executingAssembly.GetType(controllerFullName)) == null) {
controllerFullName = string.Format(controllerNamespace + ".{0}", _controllerName);
controller = executingAssembly.GetType(controllerFullName);
}
} else {
controllerFullName = string.Format(controllerNamespace + "Controllers.{0}", _controllerName);
controller = executingAssembly.GetType(controllerFullName);
}
}
return controller;
} else {
controllerFullName = string.Format(Assembly.GetExecutingAssembly().FullName.Split(new string[1] {","}, StringSplitOptions.None)
.FirstOrDefault().Trim().ToString() + ".Controllers.{0}Controller", _controllerName);
return Assembly.GetExecutingAssembly().GetType(controllerFullName);
}
}
}
/// <summary>
/// A list of the exepected parameters in the route.
/// </summary>
public struct RoutePatternCollection
{
public List<ParamType> parameters { get; set; }
public RoutePatternCollection(List<ParamType> _params) : this()
{
this.parameters = _params;
}
}
/// <summary>
/// The valid parameter types for a Custom Route Constraint.
/// </summary>
public enum ParamType
{
STRING,
INT,
UINT,
LONG,
ULONG,
BOOL,
DOUBLE
}
}
如果您看到它们，请随时提出改进建议！