CallbackEventArgs.Result Property

Gets or sets a string that contains specific information (if any) that needs to be passed to the client side for further processing.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v18.2.dll

Declaration

C#

public string Result { get; set; }

VB.NET

Public Property Result As String

Property Value

Type	Description
String	A string value that represents any information that needs to be sent to the client-side ASPxClientCallback.CallbackComplete event.

Remarks

Use the Result property if you need to pass some information to the client side to perform some client-side processing in the ASPxClientCallback.CallbackComplete event’s handler. You can pass the required information via the Result property. Typically, this can be the result of server-side processing of the CallbackEventArgsBase.Parameter property value.

Example

The complete sample project is available in the DevExpress Code Central database at E36.

JS

function ShowImage(id) {
    if (ASPxCallback1.InCallback()) 
        return;
    document.getElementById('imageCell').innerHTML = 'Loading...';
    ASPxCallback1.PerformCallback(id);
}

ASPX

<script runat="server">
     protected void Page_Load(object sender, EventArgs e) {

     }
     protected void ASPxCallback1_Callback(object source, 
         DevExpress.Web.CallbackEventArgs e) {
         string xpath = string.Format("//items/item[@id='{0}']", e.Parameter);
         XmlNode node = XmlDataSource2.GetXmlDocument().SelectSingleNode(xpath);
         if(node != null) {
             LargeImage.ImageUrl = "Images/" + node.Attributes["FileName"].Value;
             LargeImage.AlternateText = node.Attributes["Text"].Value;
             LargeImageText.Text = node.Attributes["Text"].Value; 
         }
         e.Result = ASPxCallback.GetRenderResult(ImagePanel);
     }
 }
</script>

...
         <dxcb:ASPxCallback ID="ASPxCallback1" runat="server" 
             OnCallback="ASPxCallback1_Callback">
             <ClientSideEvents CallbackComplete="function(s, e) {
     document.getElementById('imageCell').innerHTML = e.result;
 }" />
         </dxcb:ASPxCallback>
...

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the Result property.

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#

Reporting_aspxreportdesigner-how-to-create-an-aspnet-end-user-reporting-application-with-the-t227679/CS/T227679/FileDialogControl.ascx.cs#L51

    }
    e.Result = String.Empty;
}

aspxuploadcontrol-how-to-implement-a-confirmation-message-when-overwriting-a-file-e4647/CS/UploadControl.ascx.cs#L9

protected void callback_Callback(object source, DevExpress.Web.CallbackEventArgs e) {
    e.Result = (File.Exists(Server.MapPath(Path.GetFileName(e.Parameter)))) ? "1" : "0";
}

tutorial-creating-a-registration-form-using-aspxeditors-e4749/CS/ASPxEditorsTutorial.Step6/RegistrationForm.aspx.cs#L48

protected void CheckEmailCallback_Callback(object source, DevExpress.Web.CallbackEventArgs e) {
    e.Result = GetIsEmailExist(eMailTextBox.Text).ToString();
}

VB.NET

Reporting_aspxreportdesigner-how-to-create-an-aspnet-end-user-reporting-application-with-the-t227679/VB/T227679/FileDialogControl.ascx.vb#L53

    End Select
    e.Result = String.Empty
Catch ex As Exception

aspxuploadcontrol-how-to-implement-a-confirmation-message-when-overwriting-a-file-e4647/VB/UploadControl.ascx.vb#L11

Protected Sub callback_Callback(ByVal source As Object, ByVal e As DevExpress.Web.CallbackEventArgs)
    e.Result = If(File.Exists(Server.MapPath(Path.GetFileName(e.Parameter))), "1", "0")
End Sub