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.NET Standard 2.0+
.NET Framework 4.5.2+
.NET Standard 2.0+
.NET Core 3.0+

IsGrantedExtensions.CanWriteByUser<T>(SecurityStrategy, IPermissionPolicyUser, IObjectSpace, Object, String) Method

Checks whether the specified user can write an object with the specified key or this object's member.

Namespace: DevExpress.ExpressApp.Security

Assembly: DevExpress.ExpressApp.Security.v20.2.dll

Declaration

public static bool CanWriteByUser<T>(
    this SecurityStrategy security,
    IPermissionPolicyUser targetUser,
    IObjectSpace objectSpace,
    object targetObjectKey,
    string memberName = null
)
<ExtensionAttribute>
Public Shared Function CanWriteByUser(Of T)(
    security As SecurityStrategy,
    targetUser As IPermissionPolicyUser,
    objectSpace As IObjectSpace,
    targetObjectKey As Object,
    memberName As String = Nothing
) As Boolean

Parameters

Name Type Description
security SecurityStrategy

A SecurityStrategy object that specifies an application's Security Strategy.

targetUser IPermissionPolicyUser

An IPermissionPolicyUser object that is a user this method checks.

objectSpace IObjectSpace

An Object Space this method uses to get an object to check.

targetObjectKey Object

An Object that is a key of an object this method checks.

Optional Parameters

Name Type Default Description
memberName String

null

A String that is a name of the target object's member this method checks. This parameter is optional.

Type Parameters

Name Description
T

A Type of an object this method checks.

Returns

Type Description
Boolean

true, if the specified user can write an object with the specified key or this object's member; otherwise, false.

Remarks

The following example shows how to use this method.

using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Security;
using DevExpress.Persistent.Base;
using DevExpress.Persistent.BaseImpl.PermissionPolicy;
using System;
// ...
public class CheckWritePermissionController : ObjectViewController<ListView, Contact> {
    SecurityStrategy securityStrategy;
    protected override void OnActivated() {
        base.OnActivated();
        securityStrategy = Application.GetSecurityStrategy();
        View.CurrentObjectChanged += View_CurrentObjectChanged;
    }
    private void View_CurrentObjectChanged(object sender, EventArgs e) {
        Department department = ViewCurrentObject.Department;
        if (department != null) {
            object key = ObjectSpace.GetKeyValue(department);
            foreach (IPermissionPolicyUser user in ObjectSpace.GetObjects<PermissionPolicyUser>()) {
                if (!securityStrategy.CanWriteByUser<Department>(user, ObjectSpace, key, nameof(Department.Office))) {
                    // ...
                }
            }
        }
    }
}
See Also