Route.Constraints Properti

Definisi

Ruang nama:

System.Web.Routing

Rakitan:

System.Web.dll

Mendapatkan atau mengatur kamus ekspresi yang menentukan nilai yang valid untuk parameter URL.

public:
 property System::Web::Routing::RouteValueDictionary ^ Constraints { System::Web::Routing::RouteValueDictionary ^ get(); void set(System::Web::Routing::RouteValueDictionary ^ value); };

public System.Web.Routing.RouteValueDictionary Constraints { get; set; }

member this.Constraints : System.Web.Routing.RouteValueDictionary with get, set

Public Property Constraints As RouteValueDictionary

Nilai Properti

RouteValueDictionary

Objek yang berisi nama dan ekspresi parameter.

Contoh

Contoh berikut menunjukkan cara membuat Route objek dan mengatur Constraintsproperti , DataTokens, dan Defaults .

void Application_Start(object sender, EventArgs e) 
{
    RegisterRoutes(RouteTable.Routes);
}

public static void RegisterRoutes(RouteCollection routes)
{
    Route reportRoute = new Route("{locale}/{year}", new ReportRouteHandler());
    reportRoute.Defaults = new RouteValueDictionary { { "locale", "en-US" }, { "year", DateTime.Now.Year.ToString() } };
    reportRoute.Constraints = new RouteValueDictionary { { "locale", "[a-z]{2}-[a-z]{2}" }, { "year", @"\d{4}" } };
    reportRoute.DataTokens = new RouteValueDictionary { { "format", "short" } };
    routes.Add(reportRoute);
}

Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    RegisterRoutes(RouteTable.Routes)
End Sub

Shared Sub RegisterRoutes(ByVal routes As RouteCollection)
    Dim urlPattern As String
    Dim reportRoute As Route
    
    urlPattern = "{locale}/{year}"
    
    reportRoute = New Route(urlPattern, New ReportRouteHandler)
    reportRoute.Defaults = New RouteValueDictionary(New With {.locale = "en-US", .year = DateTime.Now.Year.ToString()})
    reportRoute.Constraints = New RouteValueDictionary(New With {.locale = "[a-z]{2}-[a-z]{2}", .year = "\d{4}"})
    reportRoute.DataTokens = New RouteValueDictionary(New With {.format = "short"})

    routes.Add(reportRoute)
End Sub

Contoh berikut menunjukkan Route objek yang propertinya Constraints berisi parameter bernama httpMethod dengan instans HttpMethodConstraint kelas untuk nilai .

void Application_Start(object sender, EventArgs e) 
{
    RegisterRoutes(RouteTable.Routes);
}

public static void RegisterRoutes(RouteCollection routes)
{
    string[] allowedMethods = { "GET", "POST" };
    HttpMethodConstraint methodConstraints = new HttpMethodConstraint(allowedMethods);

    Route reportRoute = new Route("{locale}/{year}", new ReportRouteHandler());
    reportRoute.Constraints = new RouteValueDictionary { { "httpMethod", methodConstraints } };

    routes.Add(reportRoute);
}

Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    RegisterRoutes(RouteTable.Routes)
End Sub

Shared Sub RegisterRoutes(ByVal routes As RouteCollection)
    Dim urlPattern As String
    Dim reportRoute As Route
    Dim allowedMethods() As String = {"GET", "POST"}
    Dim methodConstraints As HttpMethodConstraint  
    
    methodConstraints = New HttpMethodConstraint(allowedMethods)
    
    Dim constraintValues = New With {.httpMethod = methodConstraints}
    
    urlPattern = "{locale}/{year}"
    
    reportRoute = New Route(urlPattern, New ReportRouteHandler)
    reportRoute.Constraints = New RouteValueDictionary(constraintValues)
    
    routes.Add(reportRoute)
End Sub

Keterangan

Properti Constraints memungkinkan Anda membatasi nilai yang dapat diterima untuk parameter URL yang diproses oleh rute. Anda menetapkan RouteValueDictionary objek ke Constraints properti . Setiap elemen dalam RouteValueDictionary objek berisi nama parameter dan salah satu hal berikut:

• String yang menentukan ekspresi reguler. Ekspresi reguler tidak peka huruf besar/kecil.

• Objek yang mengimplementasikan IRouteConstraint antarmuka dan yang mencakup Match metode .

Kelas HttpMethodConstraint menerapkan antarmuka IRouteConstraint. Anda dapat menyertakan instans HttpMethodConstraint kelas sebagai batasan untuk menentukan kata kerja HTTP mana yang dapat diterima untuk rute.

Lihat juga

• Perutean ASP.NET