DataBind Charts to Avro Data

Ready to get started?

Download for a free trial:

Download Now

Learn more:

Avro ADO.NET Provider

Rapidly create and deploy powerful .NET applications that integrate with Avro.



Use the standard ADO.NET procedures for databinding to provide bidirectional access to Avro data from controls in the Visual Studio toolbox. This article demonstrates a graphical approach using wizards in Visual Studio, as well as how to databind with only a few lines of code.

DataBinding enables bidirectional access to data from UI controls. You can use the CData ADO.NET Provider for Avro to easily databind Avro data to Windows Forms and Web controls in Visual Studio. This article shows how to use wizards to databind Avro data to a chart that reflects any changes. The code walk-through section shows how to create a chart in 10 lines of code.

DataBind to a Chart

DataBinding consists of three steps: Instantiate the control, configure the data source, and databind.

Configure the Connection and Select Database Objects

Follow the procedure below to use the Data Source Configuration Wizard to create a chart control and the connection to Avro. In the wizard, you can select the Avro entities you want to databind.

  1. In a Windows Forms project, drag and drop a Chart control from the toolbox to the form. In the Data section of the Chart properties, select DataSource and then select Add Project Data Source from the menu.
  2. In the Data Source Configuration Wizard that appears, select Database -> Dataset.
  3. In the Choose Your Data Connection step, click New Connection.
  4. In the Add Connection dialog, click Change to select the CData Avro Data Source.

    Below is a typical connection string:

    URI=C:/folder/table.avroInitiateOAuth=GETANDREFRESH Connect to your local Avro file(s) by setting the URI connection property to the location of the Avro file.

    When you configure the connection, you may also want to set the Max Rows connection property. This will limit the number of rows returned, which is especially helpful for improving performance when designing reports and visualizations.

  5. Choose the database objects you want to work with. This example uses the SampleTable_1 table.

DataBind

After adding the data source and selecting database objects, you can bind the objects to the chart. This example assigns the x-axis to Id and the y-axis to Column1.

  1. In the Chart properties, click the button in the Series property to open the Series Collection Editor.
  2. In the Series properties, select the columns you want for the x- and y-axes: Select columns from the menu in the XValueMember and YValueMember properties.

The chart is now databound to the Avro data. Run the chart to display the current data.

Code Walk-through

DataBinding to Avro data requires only a few lines of code and can be completed in three easy steps.

  1. Connect to Avro.
  2. Create the AvroDataAdapter to execute the query and create a DataSet to be filled with its results.
  3. DataBind the result set to the chart.

Below is the complete code:

AvroConnection conn = new AvroConnection("URI=C:/folder/table.avroInitiateOAuth=GETANDREFRESH"); AvroCommand comm = new AvroCommand("SELECT Id, Column1 FROM SampleTable_1 WHERE Column2 = 'value_2'", conn); AvroDataAdapter da = new AvroDataAdapter(comm); DataSet dataset = new DataSet(); da.Fill(dataset); chart1.DataSource = dataset; chart1.Series[0].XValueMember = "Id"; chart1.Series[0].YValueMembers = "Column1"; // Insert code for additional chart formatting here. chart1.DataBind();