Capturing Data Errors on Data Sets in .NET framework

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Capturing Data Errors on Data Sets
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Data sets and their child data objects, such as data tables and rows, have built-in support for keeping track of data errors The DataRow class exposes a string RowError property that you can set to an error message to indicate that an error has occurred somewhere in that row and give descriptive information about the error To be more specific, you should also set error information associated with the individual data fields that are the cause of the error if appropriate To do that, you call the SetColumnError method on the DataRow class This method has three overloads
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The first takes a DataColumn reference and an error message as a string The second takes a column index as an integer and an error message as a string The third takes a column name as a string and the error message as a string
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The result of calling any of these overloads is to associate an error message with a particular column value within the row (a field) The following is an example of setting errors against a row: private void OnCauseDataError(object sender, EventArgs e) { northwindDataSetCustomers[0]SetColumnError(1, "Manual column error"); northwindDataSetCustomers[0]RowError = "Row error"; }
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Typically, these errors are going to be set by ADONET in response to an error when executing queries against the database, but you can set them manually, as shown in this example, for advanced scenarios When any errors have been set within a data set that is the data source for a DataGridView control, even if indirectly through a BindingSource component, then the grid will display row error and cell error icons based on those errors, as described earlier in this chapter This is because the DataRowView class that is the actual source of display data for a grid implements the IDataErrorInfo interface to make this error information readily accessible to any data-bound control without having to know the source type to discover errors within that data source object model for the specific data
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If an error has been set for any column in a row, or for the row itself, then the table itself is considered to have errors, as does the data set that contains it If you know you are programming against a data set, you can use the data set's object model to extract the error information within that data set Both the DataSet and DataTable classes expose a HasErrors Boolean property that you can check to see if there are any rows with errors If HasErrors returns true on the data set, you can iterate over the data set's Tables collection to determine which table has problems by checking the HasErrors property on each table For a table that returns true from HasErrors, if you want to programmatically explore what errors occurred, you can call theGetErrors method on that DataTable object, which will return an array ofDataRow objects containing the rows that have errors You can check the RowError property on each row for a nonempty string Additionally, you can call the GetColumnsInError method to get back an array of DataColumns, which you can then use to callGetColumnError to extract the individual error messages An example of some code to perform this drill-down process and display the errors in a separate grid is shown in Listing 101 and is contained in the DataErrorInfo sample in the chapter's download code
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Listing 101 Discovering Data Source Errors
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private class DataErrorInfo { private string m_TableName; private int m_RowNumber; private int m_ColumnNumber; private string m_ErrorMessage;
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public string TableName { get { return m_TableName; } set { m_TableName = value; } } public int RowNumber { get { return m_RowNumber; } set { m_RowNumber = value; } } public int ColumnNumber { get { return m_ColumnNumber; } set { m_ColumnNumber = value; } } public string ErrorMessage { get { return m_ErrorMessage; } set { m_ErrorMessage = value; } } internal DataErrorInfo(string tableName, int rowNo, int columnNo, string errorMsg) { m_TableName = tableName; m_RowNumber = rowNo; m_ColumnNumber = columnNo; m_ErrorMessage = errorMsg; } } private void OnDisplayDataSourceErrors(object sender, EventArgs e) { if (northwindDataSet1HasErrors) { List<DataErrorInfo> errors = new List<DataErrorInfo>(); foreach (DataTable table in northwindDataSet1Tables) { if (tableHasErrors) { string tableName = tableTableName; DataRow[] errorRows = tableGetErrors(); for (int rowIndex = 0; rowIndex < errorRowsLength;
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rowIndex++) { DataRow errorRow = errorRows[rowIndex]; int tableRowIndex = tableRowsIndexOf(errorRow); if (!stringIsNullOrEmpty(errorRowRowError)) { errorsAdd(new DataErrorInfo(tableName, tableRowIndex,-1, errorRowRowError)); } DataColumn[] colErrors = errorRowGetColumnsInError(); for (int colIndex = 0; colIndex < colErrorsLength; colIndex++) { DataColumn errorCol = colErrors[colIndex]; int tableColumnIndex = tableColumnsIndexOf(errorCol); string errorMsg = errorRowGetColumnError(errorCol); errorsAdd(new DataErrorInfo(tableName, tableRowIndex,tableColumnIndex, errorMsg)); } } } } m_ErrorsGridDataSource = errors; } }
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