/// <summary>
/// Evaluates the specified query
/// </summary>
/// <typeparam name="T">Generic type</typeparam>
/// <param name="t">Object type</param>
/// <param name="dataSource">Datasource for evaluation</param>
/// <param name="condition">Query to evaluate</param>
/// <returns>Returns a XmlElement array which contains the selected data</returns>
public object Evaluate <T>(T t, object dataSource, string condition)
{
DataTableQueryEvaluator eval = null;
XmlElement[] nodes = null;
try
{
eval = new DataTableQueryEvaluator();
XmlDataDocument xdoc = (XmlDataDocument)dataSource;
DataRow[] rows = (DataRow[])eval.Evaluate <DataTable>(xdoc.DataSet.Tables[0], xdoc.DataSet.Tables[0], condition);
nodes = new XmlElement[eval.EvaluatorIndexes.Count];
for (int i = 0; i < eval.EvaluatorIndexes.Count; i++)
{
nodes[i] = xdoc.GetElementFromRow(xdoc.DataSet.Tables[0].Rows[eval.EvaluatorIndexes[i]]);
}
return((object)nodes);
}
catch
{
throw;
}
}
/// <summary>
/// Gets the sum of the field
/// </summary>
/// <param name="dataSource">The data source</param>
/// <param name="fieldName">Name of the field</param>
/// <returns>Returs the sum of the specified field</returns>
public decimal Sum <T>(object dataSource, string fieldName, string query)
{
DataTableQueryEvaluator eval = null;
try
{
eval = new DataTableQueryEvaluator();
XmlDataDocument xdoc = (XmlDataDocument)dataSource;
decimal result = Convert.ToDecimal(eval.Sum <DataTable>(xdoc.DataSet.Tables[0], fieldName, query));
return(result);
}
catch
{
throw;
}
}
/// <summary>
/// Evaluates the minimum value.
/// </summary>
/// <param name="t">Type to evaluate</param>
/// <param name="dataSource">Data source</param>
/// <param name="fieldName">Field name foe which the evaluation is made</param>
/// <returns>XmlElement which contains the resulting field</returns>
public object EvaluateMin <T>(T t, object dataSource, string fieldName)
{
DataTableQueryEvaluator eval = null;
XmlElement element = null;
try
{
eval = new DataTableQueryEvaluator();
XmlDataDocument xdoc = (XmlDataDocument)dataSource;
DataRow row = (DataRow)eval.EvaluateMin <DataTable>(xdoc.DataSet.Tables[0], xdoc.DataSet.Tables[0], fieldName);
element = xdoc.GetElementFromRow(xdoc.DataSet.Tables[0].Rows[eval.EvaluatorIndexes[0]]);
return(element);
}
catch
{
throw;
}
}