Relations Property

Overview

Gets the list of relations from the underlying POCO dataset. Relations define parent / child navigation and are typically used for master-detail UI scenarios.

Declaration

/// <summary>
/// Gets relations
/// IObservableDataSet interface implementation
/// </summary>
public List<IDataRelation> Relations
{
    get
    {
        return _innerDataSet.Relations;
    }
}

Namespace and Assembly

Namespace: PocoDataSet.ObservableData
Assembly: PocoDataSet.ObservableData.dll

Usage Example

// 1. Create observable data set
IObservableDataSet observableDataSet = new ObservableDataSet();

// 2. Add parent observable data table Department
IObservableDataTable department = observableDataSet.AddNewTable("Department");
department.AddColumn("Id", DataTypeNames.INT32, isPrimaryKey: true);
department.AddColumn("Name", DataTypeNames.STRING);

// 3. Add child observable data table Employee IObservableDataTable employee = observableDataSet.AddNewTable("Employee");
employee.AddColumn("Id", DataTypeNames.INT32, isPrimaryKey: true);
employee.AddColumn("DepartmentId", DataTypeNames.INT32);
employee.AddColumn("Name", DataTypeNames.STRING);

// 4. Define a relation at POCO level (then UI can navigate)
observableDataSet.InnerDataSet.AddRelation(
    "Department_Employee",
    parentTableName: "Department",
    parentColumnName: "Id",
    childTableName: "Employee",
    childColumnName: "DepartmentId");

// 5. Observe the number of data relations in data set is changed
Console.WriteLine("Relations count: " + observableDataSet.Relations.Count);

 

Table of Content POCO DataSet API References ObservablePOCO DataSet Types ObservableDataSet Members

 

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Business Process Programming in .Net
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