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DataBind GraphQL Data to the DevExpress Data Grid
Use the CData ADO.NET Provider for GraphQL with the DevExpress Windows Forms and Web controls to provide GraphQL data to a chart.
The ADO.NET Provider for GraphQL by CData incorporates conventional ADO.NET data access components compatible with third-party controls. You can adhere to the standard ADO.NET data binding procedures to establish two-way access to real-time data through UI controls. This article will demonstrate the utilization of CData components for data binding with DevExpress UI Controls (Windows Forms and Web controls), specifically binding to a chart that visualizes live data.
You must specify the URL of the GraphQL service. The driver supports two types of authentication:
- Basic: Set AuthScheme to Basic. You must specify the User and Password of the GraphQL service.
- OAuth 1.0 & 2.0: Take a look at the OAuth section in the Help documentation for detailed instructions.
Windows Forms Controls
The code below shows how to populate a DevExpress chart with GraphQL data. The GraphQLDataAdapter binds to the Series property of the chart control. The Diagram property of the control defines the x- and y-axes as the column names.
using (GraphQLConnection connection = new GraphQLConnection(
"AuthScheme=Basic;User=username;Password=password;URL=https://mysite.com;InitiateOAuth=GETANDREFRESH")) {
GraphQLDataAdapter dataAdapter = new GraphQLDataAdapter(
"SELECT Name, Email FROM Users WHERE UserLogin = 'admin'", connection);
DataTable table = new DataTable();
dataAdapter.Fill(table);
DevExpress.XtraCharts.Series series = new DevExpress.XtraCharts.Series();
chartControl1.Series.Add(series);
series.DataSource = table;
series.ValueDataMembers.AddRange(new string[] { "Email" });
series.ArgumentScaleType = DevExpress.XtraCharts.ScaleType.Qualitative;
series.ArgumentDataMember = "Name";
series.ValueScaleType = DevExpress.XtraCharts.ScaleType.Numerical;
chartControl1.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False;
((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;
}
Web Controls
The code below shows how to populate a DevExpress Web control with GraphQL data. The GraphQLDataAdapter binds to the Series property of the chart; the Diagram property defines the x- and y-axes as the column names.
using DevExpress.XtraCharts;
using (GraphQLConnection connection = new GraphQLConnection(
"AuthScheme=Basic;User=username;Password=password;URL=https://mysite.com;InitiateOAuth=GETANDREFRESH"))
{
GraphQLDataAdapter GraphQLDataAdapter1 = new GraphQLDataAdapter("SELECT Name, Email FROM Users WHERE UserLogin = 'admin'", connection);
DataTable table = new DataTable();
GraphQLDataAdapter1.Fill(table);
DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar);
WebChartControl1.Series.Add(series);
series.DataSource = table;
series.ValueDataMembers.AddRange(new string[] { "Email" });
series.ArgumentScaleType = ScaleType.Qualitative;
series.ArgumentDataMember = "Name";
series.ValueScaleType = ScaleType.Numerical;
((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;
}
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