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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.net.webpermission below:

WebPermission Class (System.Net) | Microsoft Learn

WebPermission Class Definition

Caution

Code Access Security is not supported or honored by the runtime.

Controls rights to access HTTP Internet resources.

public ref class WebPermission sealed : System::Security::CodeAccessPermission, System::Security::Permissions::IUnrestrictedPermission

[System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class WebPermission : System.Security.CodeAccessPermission, System.Security.Permissions.IUnrestrictedPermission

[System.Serializable]
public sealed class WebPermission : System.Security.CodeAccessPermission, System.Security.Permissions.IUnrestrictedPermission

public sealed class WebPermission : System.Security.CodeAccessPermission, System.Security.Permissions.IUnrestrictedPermission

[<System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type WebPermission = class
    inherit CodeAccessPermission
    interface IUnrestrictedPermission

[<System.Serializable>]
type WebPermission = class
    inherit CodeAccessPermission
    interface IUnrestrictedPermission

type WebPermission = class
    inherit CodeAccessPermission
    interface IUnrestrictedPermission

Public NotInheritable Class WebPermission
Inherits CodeAccessPermission
Implements IUnrestrictedPermission

Inheritance

Attributes

Implements

Caution

Code Access Security (CAS) has been deprecated across all versions of .NET Framework and .NET. Recent versions of .NET do not honor CAS annotations and produce errors if CAS-related APIs are used. Developers should seek alternative means of accomplishing security tasks.

WebPermission provides a set of methods and properties to control access to Internet resources. You can use a WebPermission to provide either restricted or unrestricted access to your resource, based on the PermissionState that is set when the WebPermission is created.

Create a WebPermission instance by calling its constructor using one of the following sets of parameters:

No parameters. The default PermissionState is None.
A PermissionState. Specify either Unrestricted to allow any URI to be used in the target class, or None to allow access only to URIs that you specify through the use of the AddPermission method.
A NetworkAccess value and a URI string. The specified URI has permissions granted by the NetworkAccess value.
A NetworkAccess specifier and URI regular expression.

The ConnectList and AcceptList hold the URIs to which you have granted access permission. To add a URI to either of these lists, use AddPermission. If you pass Accept as the NetworkAccess parameter, the URI will be added to the AcceptList. WebPermission will allow connections to your target class with URIs matching the AcceptList.

Caution

To deny access to an Internet resource, you must deny access to all the possible paths to that resource. This requires calling WebPermission.WebPermission with state parameter set to Deny. A better approach is to allow access to the specific resource only. For more information about this subject, refer to the Using the Deny Method topic.

Note

You need to deny access using only the resource canonical path. There is no need to use all the path's syntactical variations.

Note

User name and default port information is stripped from the Uri before the comparison with the regular expression argument that is supplied to the WebPermission(NetworkAccess, Regex) constructor. If the regular expression contains user information or the default port number, then all incoming Uris will fail to match the regular expression.

Constructors Properties AcceptList

This property returns an enumeration of a single accept permissions held by this WebPermission. The possible objects types contained in the returned enumeration are String and Regex.

ConnectList

This property returns an enumeration of a single connect permissions held by this WebPermission. The possible objects types contained in the returned enumeration are String and Regex.

Methods See also

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