protected override int ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues)
{
DataTable table = new CsvDataTable().FileToDataTable(this.SourceFile, true);
string originalKey = keys[this.KeyFieldName].ToString();
DataRow[] foundRows = table.Select(this.KeyFieldName + "=" + originalKey);
string newKey = string.Empty;
//we should find only 1 row
if (foundRows.Length != 1)
{
throw new Exception("Invalid update operation. Please make sure that data contains unique key records");
}
bool raiseKeyFieldUpdate = false;
foundRows[0].BeginEdit();
for (int c = 0; c < table.Columns.Count; c++)
{
if ((table.Columns[c].Caption == this.KeyFieldName) && (values[table.Columns[c].Caption] != null))
{
if (foundRows[0][c].ToString() != values[table.Columns[c].Caption].ToString())
{
newKey = values[table.Columns[c].Caption].ToString();
raiseKeyFieldUpdate = true;
}
}
if (values[table.Columns[c].Caption] != null)
{
foundRows[0][c] = values[table.Columns[c].Caption];
}
}
foundRows[0].EndEdit();
string operationId = this.FireBeforePerforming(this, "rowupdated", null); //todo-operationName as property to remove hardcoding
string operationIdkfupdated = string.Empty;
if (raiseKeyFieldUpdate)
{
operationIdkfupdated = this.FireBeforePerforming(this, "keyfieldupdated", null);
}
new CsvDataTable().DataTableToFile(table, this.sourceFile);
Dictionary <string, object> Param = new Dictionary <string, object>();
Param.Add("UniqueKeyNameOfThisSetOfData", this.uniqueKeyNameOfThisSetOfData);
Param.Add("oldKey", originalKey);
Param.Add("newKey", newKey == string.Empty? originalKey:newKey);
this.FireAfterPerforming(this, operationId, Param);
if (raiseKeyFieldUpdate)
{
this.FireAfterPerforming(this, operationIdkfupdated, Param);
}
return(1);
}
// Get data from the underlying data source.
// Build and return a DataView, regardless of mode.
protected override IEnumerable ExecuteSelect(DataSourceSelectArguments selectArgs)
{
IEnumerable dataList = null;
// Open the .csv file.
if (File.Exists(this.SourceFile))
{
DataTable data = new CsvDataTable().FileToDataTable(this.SourceFile, this.IncludesColumnNames);
#region Commented
//DataTable data = new DataTable();
//// Open the file to read from.
//using (StreamReader sr = File.OpenText(this.SourceFile))
//{
// // Parse the line
// string s = "";
// string[] dataValues;
// DataColumn col;
// // Do the following to add schema.
// dataValues = sr.ReadLine().Split(',');
// // For each token in the comma-delimited string, add a column
// // to the DataTable schema.
// foreach (string token in dataValues)
// {
// col = new DataColumn(token, typeof(string));
// data.Columns.Add(col);
// }
// // Do not add the first row as data if the CSV file includes column names.
// if (!IncludesColumnNames)
// data.Rows.Add(CopyRowData(dataValues, data.NewRow()));
// // Do the following to add data.
// while ((s = sr.ReadLine()) != null)
// {
// dataValues = s.Split(',');
// data.Rows.Add(CopyRowData(dataValues, data.NewRow()));
// }
//}
#endregion Commented
data.AcceptChanges();
DataView dataView = new DataView(data);
if (selectArgs.SortExpression != String.Empty)
{
dataView.Sort = selectArgs.SortExpression;
}
dataList = dataView;
}
else
{
throw new System.Configuration.ConfigurationErrorsException("File not found, " + this.SourceFile);
}
if (null == dataList)
{
throw new InvalidOperationException("No data loaded from data source.");
}
return(dataList);
}
