来自路径/路由的ASP.NET核心API搜索参数
我正在移植一个使用来自路径/路由的ASP.NET核心API搜索参数,asp.net,rest,asp.net-core,Asp.net,Rest,Asp.net Core,我正在移植一个使用$params=$this->uri->uri_to_assoc()的PHP/API,以便它可以接受多种组合的GET请求,例如: 等 有很多代码,比如: $page = 1; if (!empty($params['page'])) { $page = (int)$params['page']; } 我尝试过的两种ASP.NET Core 2.1技术看起来都是一个难题,因此我希望您能为我提供更好的解决方案: 1) 使用catchall的常规路由: app.U
$params=$this->uri->uri_to_assoc()
的PHP/API,以便它可以接受多种组合的GET请求,例如:
- 等
$page = 1;
if (!empty($params['page'])) {
$page = (int)$params['page'];
}
我尝试过的两种ASP.NET Core 2.1技术看起来都是一个难题,因此我希望您能为我提供更好的解决方案:
1) 使用catchall的常规路由:
app.UseMvc(routes => {
routes.MapRoute(
name: "default",
template: "{controller=Properties}/{action=Search}/{*params}"
);
});
但是现在我必须解析键/值对的params
字符串,不能利用模型绑定
2) 属性路由:
[HttpGet("properties/search")]
[HttpGet("properties/search/beds/{beds}")]
[HttpGet("properties/search/beds/{beds}/page/{page}")]
[HttpGet("properties/search/page/{page}/beds/{beds}")]
public IActionResult Search(int beds, double lat, double lon, int page = 1, int limit = 10) {
}
显然,将允许的搜索参数和值的每一个组合放在一起都是乏味的
更改这些终结点的签名不是一个选项。编辑
这是一个更好的选择
总体思路
$params=$this->uri->uri\u to\u assoc()
将uri转换为关联数组,基本上是一个.NET字典。我们可以在ASP.NET内核中执行类似的操作。假设我们有以下路线
app.UseMvc(routes => {
routes.MapRoute(
name: "properties-search",
template: "{controller=Properties}/{action=Search}/{*params}"
);
});
将Uri路径绑定到字典
行动
public class PropertiesController : Controller
{
public IActionResult Search(string slug)
{
var dictionary = slug.ToDictionaryFromUriPath();
return Json(dictionary);
}
}
public IActionResult Search(string slug)
{
BedsEtCetera model = slug.BindFromUriPath<BedsEtCetera>();
return Json(model);
}
扩展方法
public static class UrlToAssocExtensions
{
public static Dictionary<string, string> ToDictionaryFromUriPath(this string path) {
var parts = path.Split('/');
var dictionary = new Dictionary<string, string>();
for(var i = 0; i < parts.Length; i++)
{
if(i % 2 != 0) continue;
var key = parts[i];
var value = parts[i + 1];
dictionary.Add(key, value);
}
return dictionary;
}
}
但是现在我必须解析键/值对的params字符串,不能利用模型绑定
将Uri路径绑定到模型
如果您希望为此进行模型绑定,那么我们需要更进一步
模型
行动
public class PropertiesController : Controller
{
public IActionResult Search(string slug)
{
var dictionary = slug.ToDictionaryFromUriPath();
return Json(dictionary);
}
}
public IActionResult Search(string slug)
{
BedsEtCetera model = slug.BindFromUriPath<BedsEtCetera>();
return Json(model);
}
public IActionResult搜索(字符串段塞)
{
床头柜模型=slug.BindFromUriPath();
返回Json(模型);
}
附加扩展方法
public static TResult BindFromUriPath<TResult>(this string path)
{
var dictionary = path.ToDictionaryFromUriPath();
var json = JsonConvert.SerializeObject(dictionary);
return JsonConvert.DeserializeObject<TResult>(json);
}
公共静态TResult BindFromUriPath(此字符串路径)
{
var dictionary=path.ToDictionaryFromUriPath();
var json=JsonConvert.SerializeObject(字典);
返回JsonConvert.DeserializeObject(json);
}
我想你是从错误的角度看待这个问题的
创建模型:
public class FiltersViewModel
{
public int Page { get; set; } = 0;
public int ItemsPerPage { get; set; } = 20;
public string SearchString { get; set; }
public string[] Platforms { get; set; }
}
API端点:
[HttpGet]
public async Task<IActionResult> GetResults([FromRoute] ViewModels.FiltersViewModel filters)
{
// process the filters here
}
FromPath
值提供程序
您想要的是将复杂模型绑定到url路径的一部分。不幸的是,ASP.NET核心没有内置的FromPath
binder。幸运的是,我们可以建立自己的
下面是一个具有以下结果的示例:
基本上,它是绑定domain.com/controller/action/key/value/key/value/key/value
。这与FromRoute
或FromQuery
值提供程序所做的不同
使用FromPath
值提供程序
创建如下所示的路线:
routes.MapRoute(
name: "properties-search",
template: "{controller=Properties}/{action=Search}/{*path}"
);
将[FromPath]
属性添加到操作中:
public IActionResult Search([FromPath]BedsEtCetera model)
{
return Json(model);
}
它神奇地将*路径
绑定到一个复杂的模型:
public class BedsEtCetera
{
public int Beds { get; set; }
public int Page { get; set; }
public string Sort { get; set; }
}
创建FromPath
值提供程序
基于创建新属性
基于创建新的IValueProvider
在您的启动
类中将所有内容连接在一起
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc()
.AddMvcOptions(options =>
options.ValueProviderFactories.Add(new PathValueProviderFactory()));
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
app.UseMvc(routes => {
routes.MapRoute(
name: "properties-search",
template: "{controller=Properties}/{action=Search}/{*path}"
);
});
}
}
这是 FromQuery
绑定到查询字符串(在URL中的?
之后),而不是路径。因此,它不适用于/key/value/key/value/…
模式
[AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Property,
AllowMultiple = false, Inherited = true)]
public class FromPath : Attribute, IBindingSourceMetadata, IModelNameProvider
{
/// <inheritdoc />
public BindingSource BindingSource => BindingSource.Custom;
/// <inheritdoc />
public string Name { get; set; }
}
public class PathValueProviderFactory : IValueProviderFactory
{
public Task CreateValueProviderAsync(ValueProviderFactoryContext context)
{
var provider = new PathValueProvider(
BindingSource.Custom,
context.ActionContext.RouteData.Values);
context.ValueProviders.Add(provider);
return Task.CompletedTask;
}
}
public class PathValueProvider : IValueProvider
{
public Dictionary<string, string> _values { get; }
public PathValueProvider(BindingSource bindingSource, RouteValueDictionary values)
{
if(!values.TryGetValue("path", out var path))
{
var msg = "Route value 'path' was not present in the route.";
throw new InvalidOperationException(msg);
}
_values = (path as string).ToDictionaryFromUriPath();
}
public bool ContainsPrefix(string prefix) => _values.ContainsKey(prefix);
public ValueProviderResult GetValue(string key)
{
key = key.ToLower(); // case insensitive model binding
if(!_values.TryGetValue(key, out var value)) {
return ValueProviderResult.None;
}
return new ValueProviderResult(value);
}
}
public static class StringExtensions {
public static Dictionary<string, string> ToDictionaryFromUriPath(this string path) {
var parts = path.Split('/');
var dictionary = new Dictionary<string, string>();
for(var i = 0; i < parts.Length; i++)
{
if(i % 2 != 0) continue;
var key = parts[i].ToLower(); // case insensitive model binding
var value = parts[i + 1];
dictionary.Add(key, value);
}
return dictionary;
}
}
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc()
.AddMvcOptions(options =>
options.ValueProviderFactories.Add(new PathValueProviderFactory()));
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
app.UseMvc(routes => {
routes.MapRoute(
name: "properties-search",
template: "{controller=Properties}/{action=Search}/{*path}"
);
});
}
}