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JSON Data Source

  • 3 minutes to read

This tutorial shows how to add the DashboardJsonDataSource to data source storage and make it available to users. The tutorial uses an online resource, a file, and a JSON string.

Important

The DashboardJsonDataSource object requires the open source Newtonsoft.Json library. Install the Newtonsoft.Json NuGet package in Visual Studio.

  1. In the Default.aspx.cs (or .vb) file, set resource access rules to allow access to all file directories and URLs.

    protected void Page_Load(object sender, EventArgs e) {
        // ...
    
        // Sets resource access rules.
        AccessSettings.DataResources.TrySetRules(UrlAccessRule.Allow(), DirectoryAccessRule.Allow());
    }
    

    Note

    Refer to the IAccessRule topic for additional information about access to file directories and URLs.

  2. In the same file, create a public method that returns the configured dashboard’s data source storage (DataSourceInMemoryStorage) and define the JSON data sources. Use the JsonDataSource.RootElement property to specify the name of the root element in the associated data source and specify JsonDataSource.JsonSource, which stores JSON data import settings.

    using System;
    using DevExpress.DashboardCommon;
    using DevExpress.DataAccess.Json;
    
    public DataSourceInMemoryStorage CreateDataSourceStorage() {
        DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();
    
        // Creates a JSON data source from a URL.
        DashboardJsonDataSource jsonDataSourceUrl = new DashboardJsonDataSource("JSON Data Source (URL)");
        jsonDataSourceUrl.JsonSource = new UriJsonSource(new Uri("https://raw.githubusercontent.com/DevExpress-Examples/DataSources/master/JSON/customers.json"));
        jsonDataSourceUrl.RootElement = "Customers";
        dataSourceStorage.RegisterDataSource("jsonDataSourceUrl", jsonDataSourceUrl.SaveToXml());
    
        // Creates a JSON data source from a JSON file.
        DashboardJsonDataSource jsonDataSourceFile = new DashboardJsonDataSource("JSON Data Source (File)");
        Uri fileUri = new Uri(@"App_Data/customers.json", UriKind.RelativeOrAbsolute);
        jsonDataSourceFile.JsonSource = new UriJsonSource(fileUri);
        jsonDataSourceFile.RootElement = "Customers";
        dataSourceStorage.RegisterDataSource("jsonDataSourceFile", jsonDataSourceFile.SaveToXml());
    
        // Registers a JSON data source from a JSON string.
        DashboardJsonDataSource jsonDataSourceString = new DashboardJsonDataSource("JSON Data Source (String)");
        string json = "{\"Customers\":[{\"Id\":\"ALFKI\",\"CompanyName\":\"Alfreds Futterkiste\",\"ContactName\":\"Maria Anders\",\"ContactTitle\":\"Sales Representative\",\"Address\":\"Obere Str. 57\",\"City\":\"Berlin\",\"PostalCode\":\"12209\",\"Country\":\"Germany\",\"Phone\":\"030-0074321\",\"Fax\":\"030-0076545\"}],\"ResponseStatus\":{}}";
        jsonDataSourceString.JsonSource = new CustomJsonSource(json);
        jsonDataSourceString.RootElement = "Customers";
        dataSourceStorage.RegisterDataSource("jsonDataSourceString", jsonDataSourceString.SaveToXml());
    
        return dataSourceStorage;
    }
    
  3. Call the ASPxDashboard.SetDataSourceStorage method to configure the data source storage. Use the created CreateDataSourceStorage method as the SetDataSourceStorage parameter.

    using DevExpress.DashboardWeb;
    
    protected void Page_Load(object sender, EventArgs e) {
        // ...  
    
        // Configures the data source storage.
        ASPxDashboard1.SetDataSourceStorage(CreateDataSourceStorage());
    
        // Sets resource access rules.
        AccessSettings.DataResources.TrySetRules(UrlAccessRule.Allow(),DirectoryAccessRule.Allow());
    }
    

JSON data sources are now available in the Web Dashboard:

Users can now bind dashboard items to data in the Web Dashboard’s UI.

Dashboard Data Source Wizard

Users can use the Dashboard Data Source Wizard to create a new dashboard data source based on JSON data. To store new data connections, you need to implement JSON data connection storage.

See the following topic for details: Specify Data Source Settings (JSON).

Example

The example shows how to make a set of data sources available for users in the Web Dashboard application.

View Example: How to Register Data Sources for ASP.NET Web Forms Dashboard Control