ValueManager.GetValueManager<ValueType>(String) Method

Finds the platform-specific value manager with a specified identifier. If the appropriate value manager is not found, this method creates it.

Namespace: DevExpress.Persistent.Base

Assembly: DevExpress.ExpressApp.v24.1.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

public static IValueManager<ValueType> GetValueManager<ValueType>(
    string key
)

VB.NET

Public Shared Function GetValueManager(Of ValueType)(
    key As String
) As IValueManager(Of ValueType)

Parameters

Name	Type	Description
key	String	A value manager identifier.

Type Parameters

Name
ValueType

Returns

Type	Description
IValueManager<ValueType>	A platform-specific value manager with the key identifier.

Remarks

The following example demonstrates how to use this method:

C#

using DevExpress.ExpressApp;
using DevExpress.Persistent.Base;

namespace MySolutionName.Module.Controllers {
    public class MyViewController : ViewController {
        protected override void OnActivated() {
            MyValue = "MyString"; // Store a value in ValueManager
            string myString = MyValue; // Get a value from ValueManager
        }
        public string MyValue {
            get {
                IValueManager<string> valueManager = ValueManager.GetValueManager<string>("myKey");
                if (valueManager.CanManageValue)
                    return valueManager.Value;
                else return "Some default value";
            }
            set {
                IValueManager<string> valueManager = ValueManager.GetValueManager<string>("myKey");
                if (valueManager.CanManageValue)
                    valueManager.Value = value;
            }
        }
    }
}

VB.NET

Imports DevExpress.ExpressApp
Imports DevExpress.Persistent.Base

Namespace MySolutionName.[Module].Controllers
    Public Class MyViewController
        Inherits ViewController

        Protected Overrides Sub OnActivated()
            MyValue = "MyString"
            Dim myString As String = MyValue
        End Sub

        Public Property MyValue() As String
            Get
                Dim _valueManager As IValueManager(Of String) = ValueManager.GetValueManager(Of String)("myKey")
                If _valueManager.CanManageValue Then
                    Return _valueManager.Value
                Else
                    Return "Some default value"
                End If
            End Get
            Set(ByVal value As String)
                Dim _valueManager As IValueManager(Of String) = ValueManager.GetValueManager(Of String)("myKey")
                If _valueManager.CanManageValue Then
                    _valueManager.Value = value
                End If
            End Set
        End Property
    End Class
End Namespace

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the GetValueManager<ValueType>(String) method.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

XAF-How-to-Implement-CRUD-Operations-for-Non-Persistent-Objects-Stored-Remotely/CS/NonPersistentObjectsDemo.Module/ServiceProvider.cs#L19

public static T GetService() {
    var vm = ValueManager.GetValueManager<T>(typeof(CurrentUserServiceProvider<T>).FullName);
    T result;

VB.NET

XAF-How-to-Implement-CRUD-Operations-for-Non-Persistent-Objects-Stored-Remotely/VB/NonPersistentObjectsDemo.Module/ServiceProvider.vb#L19

Public Shared Function GetService() As T
    Dim vm = ValueManager.GetValueManager(Of T)(GetType(CurrentUserServiceProvider(Of T)).FullName)
    Dim result As T