PermissionSettingHelper.AddMemberPermissionFromLambda<T>(IPermissionPolicyRole, String, String, Expression<Func<T, Boolean>>, Nullable<SecurityPermissionState>) Method

Finds the first type permission for the specified type in the role and adds the member permission to it. If the appropriate type permission is not found, this method creates it.

Namespace: DevExpress.ExpressApp.Security

Assembly: DevExpress.ExpressApp.Security.v23.2.dll

NuGet Package: DevExpress.ExpressApp.Security

Declaration

C#

public static IPermissionPolicyMemberPermissionsObject AddMemberPermissionFromLambda<T>(
    this IPermissionPolicyRole role,
    string operations,
    string members,
    Expression<Func<T, bool>> lambda,
    SecurityPermissionState? State
)
    where T : class

VB.NET

<ExtensionAttribute>
Public Shared Function AddMemberPermissionFromLambda(Of T As Class)(
    role As IPermissionPolicyRole,
    operations As String,
    members As String,
    lambda As Expression(Of Func(Of T, Boolean)),
    State As SecurityPermissionState?
) As IPermissionPolicyMemberPermissionsObject

Parameters

Name	Type	Description
role	IPermissionPolicyRole	The target role for a new object permission.
operations	String	The semicolon-separated list of security operations. The static SecurityOperations class defines operation names and their delimiter.
members	String	The semicolon-separated list of target member names.
lambda	Expression<Func<T, Boolean>>	The lambda expression that specifies the target object(s).
State	Nullable<SecurityPermissionState>	A SecurityPermissionState enumeration value that specifies if access is granted or denied.

Type Parameters

Name	Description
T	This method finds the type permission for this type in the role.

Returns

Type	Description
DevExpress.Persistent.Base.IPermissionPolicyMemberPermissionsObject	The added member permission.

Remarks

The following example demonstrates how to use this method in UpdateDatabaseAfterUpdateSchema() (MySolution.Module\DatabaseUpdater\Updater.cs):

C#

using DevExpress.Data.Filtering;
using DevExpress.ExpressApp.Security;
using DevExpress.ExpressApp.SystemModule;
using DevExpress.ExpressApp.Updating;
using DevExpress.Persistent.Base;
using DevExpress.Persistent.BaseImpl.PermissionPolicy;
// ...
public class Updater : ModuleUpdater {
    // ...
    public override void UpdateDatabaseAfterUpdateSchema() {
        base.UpdateDatabaseAfterUpdateSchema();
        PermissionPolicyRole defaultRole = ObjectSpace.FirstOrDefault<PermissionPolicyRole>(role => role.Name == "Default");
        if(defaultRole == null) {
            defaultRole = ObjectSpace.CreateObject<PermissionPolicyRole>();
            defaultRole.AddMemberPermissionFromLambda<ApplicationUser>(
                SecurityOperations.Write, 
                "ChangePasswordOnFirstLogon", 
                u => u.Oid == (Guid)CurrentUserIdOperator.CurrentUserId(), 
                SecurityPermissionState.Allow
            );
            // ...
        }
        // ...
    }
}

```

Note

Alternatively, you can use the AddMemberPermission<T>(IPermissionPolicyRole, String, String, String, Nullable<SecurityPermissionState>) method, which takes a criteria expression instead of a lambda expression.