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    Custom File Dialogs Content Provider

    Database File Provider

    This example demonstrates the implementation of a custom FileBrowserContentProvider, using a SQL database as a file source. In the offline demos instalation the DBContentProvider class is available in the App_Code\Editor\ folder or in this code library.

    Custom FileBrowserContentProvider implementation allows using virtually any type of file sources for the FileBrowser dialogs (Image Manager, DocumentManager, Media Manager, Flash Manager, Template Manager):

    • Database
    • Custom role-based CMS system
    • Web service
    • Applications which use URL Rewriters
    The DBFileBrowserContentProvider class inherits the abstract Telerik.Web.UI.Widgets.FileBrowserContentProvider class and implements its abstract members:
    • ResolveRootDirectoryAsTree- Called in order to load all subfolders of the passed as parameter folder
    • ResolveDirectory - Called in order to load all files of the passed as parameter folder
    • StoreFile - called to save an uploaded file to the storage
    • DeleteFile - called when user deletes a file
    • DeleteDirectory - called when user deletes a directory
    • CreateDirectory - called when user creates a directory
    • CanCreateDirectory - a readonly property, which value identifies if the New Directory icon will exist in the FileBrowser
    • GetFile - used in two cases: 1) to identify if a file with the same name exists in the same path when uploading a file; 2) when creating a thumbnail used to get the original image content
    • StoreBitmap - used to save a newly created bitmap to the storage
    • GetFileName - used to return the name of a file with given URL
    • GetPath - used to return the path of an item (file or directory) with given URL

    DBFileBrowserContentProvider uses a helper DataServer class, designed to handle the database operation functions.

    The file content is stored in the database and is served by the content-streamer Handler.ashx file.

    Related Resources

    • DefaultVB.aspx
    • DefaultVB.aspx.vb
    • DBFileBrowserContentProvider.xml
    <%@ Page Theme="Default" Language="vb" CodeFile="DefaultVB.aspx.vb" AutoEventWireup="true"    Inherits="Telerik.Web.Examples.Editor.DBFileBrowserContentProvider.DefaultVB" %>
     
    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <!DOCTYPE html>
    <html xmlns='http://www.w3.org/1999/xhtml'>
    <head runat="server">
        <title>Telerik ASP.NET Example</title>
    <link href="../Common/styles.css" rel="stylesheet" type="text/css" />
    </head>
    <body>
        <form id="form1" runat="server">
        <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
        <telerik:RadSkinManager ID="RadSkinManager1" runat="server" ShowChooser="true" />
        <div class="demo-container size-wide">
            <telerik:RadEditor RenderMode="Lightweight" ID="RadEditor1" runat="server" ToolsFile="./DBFileBrowserContentProvider.xml" Width="800px">
                <Content>
                <img alt="" src="../../../Editor/Examples/DBFileBrowserContentProvider/Handler.ashx?path=Root%252fImages%252fNature%252fFruits%252f320155_1886Thumbnail.jpg" />
                - The custom content provider provides a complete abstraction for files/folders in the file browser dialogs of the editor. 
                <br /><br />This means that the user can create folders, upload, move, delete files and everything will be stored in a single table in the database. No physical files or folders will be created on the server. Accessing
                            the files from the database is performed with a HTTP handler (<em>Handler.ashx</em>). 
                <br /><br />If the user uploaded an image to the database and then inserted it 
                            in the editor, the image's URL will look in a similar way (so the browser makes a request for the HTTP Handler):
                <br /><strong>Handler.ashx?path=Root%252fImages%252fNature%252fFruits%252f320155_1886Thumbnail.jpg</strong>
                </Content>
            </telerik:RadEditor>
        </div>
        </form>
    </body>
    </html>

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