winforms data matrix

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and properties that are not declared at the type level. Thus, the use of a .NET generics parameter with an indexer or property will not work. In my opinion, that is a real C# language design flaw, because it means we need to write code like this: ... using Devspace.Trader.Common; public interface IWorkbook : IDebug { IWorksheet<BaseType> GetSheet<BaseType>(string identifier); IWorksheetBase this[string identifier] { get; set; } string Identifier { get; } } In this modified declaration, the method GetSheet() acts like the get part of the indexer, but notice where the .NET generics parameter BaseType is declared. The declaration is after the method identifier and before the first bracket. In the case of IWorkbook, we use the method-level .NET generics parameter to allow the caller to determine the type of the worksheet instances. The implementation of IWorkbook has to do nothing other than perform the appropriate type cast. Method-level .NET generics parameters are great when you are dealing with mixed types, as in the case of IWorkbook. The code to retrieve a worksheet that previously needed a type cast is rewritten as follows: IWorkbook workbook; IWorksheet<string> worksheet = workbook.GetSheet<string>(WorksheetIdentifiers.Configuration); The type cast has not disappeared completely. It is done for us in the implementation of the GetSheet<>() method, as demonstrated by the following code. public IWorksheet<MethodBaseType> GetSheet<MethodBaseType>(string identifier) { lock (_worksheets) { IWorksheet<MethodBaseType> retval = null; if (_worksheets.ContainsKey(identifier)) { retval = _worksheets[identifier] as IWorksheet<MethodBaseType >; } else { retval = new Worksheet<MethodBaseType>(identifier); _worksheets.Add(identifier, retval); } return retval; } } The bolded code shows that there is still a type cast, but the type cast is in the method, and it uses the .NET generics parameter declared at the method level.

Figure 11-19. Executing AdminDepartments.aspx with skins and styles 22. Now that everything looks good, you can implement the functionality by writing the event handlers for the Edit, View Categories, and Delete buttons. You ll start with the row editing functionality. Open AdminDepartments.aspx in Design View and select the GridView control. 23. In the Properties window, double-click the RowEditing entry (as shown in Figure 11-20). Visual Web Developer generates the grid_RowEditing event handler for you in the code-behind file, This method is executed when the visitor clicks the Edit button in the grid, and it must enable edit mode for that row. Modify the code in grid_RowEditing like this: // enter edit mode protected void grid_RowEditing(object sender, GridViewEditEventArgs e) { // Set the row for which to enable edit mode grid.EditIndex = e.NewEditIndex; // Set status message statusLabel.Text = "Editing row # " + e.NewEditIndex.ToString(); // Reload the grid BindGrid(); }

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scenario is a group of Excel worksheet cell values and formulas that can be saved and swapped out automatically for another group of cell values in a worksheet. In this chapter, you will learn more about what scenarios are, when you would want to use scenarios, and how to create and work with scenarios. Then you will work through three Try It exercises to practice creating and working with scenarios on your own. The final section covers troubleshooting common problems with scenarios.

Now let s look at how the workbook and worksheet are implemented. The following is the complete code for the IWorksheet interface implementation. class Worksheet<BaseType> : TraderBaseClass, IWorksheet<BaseType>, IWorksheetSerialize { BaseType[,] CellState; Func<IWorksheet<BaseType>, int, int, BaseType>[,] Cells; Func<IWorksheet<BaseType>, int, int, BaseType>[] ColCells; int[,] CalculationVersion; int CurrVersion; int _maxRows; int _maxCols; string _identifier; public Worksheet() { } public Worksheet(string identifier) { _identifier = identifier; } public void Dimension(int rows, int cols) { CellState = new BaseType[rows, cols]; Cells = new Func<IWorksheet<BaseType>, int, int, BaseType>[rows, cols]; CalculationVersion = new int[rows, cols]; ColCells = new Func<IWorksheet<BaseType>, int, int, BaseType>[cols]; CurrVersion = 0; _maxRows = rows; _maxCols = cols; } public int MaxRows { get { return _maxRows; } } public int MaxCols { get { return _maxCols; } }

Figure 11-20. Using Visual Web Developer to generate new event handlers 24. While in edit mode, instead of placing the Edit button, the GridView places two buttons: Update and Cancel. To make editing functional, you need to supply code that reacts when these buttons are clicked. Let s start with the code that deals with the Cancel button. Follow the same procedure to generate grid_RowCancelingEdit and complete its code like this: // Cancel edit mode protected void grid_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e) { // Cancel edit mode grid.EditIndex = -1; // Set status message statusLabel.Text = "Editing canceled"; // Reload the grid BindGrid(); } Now you have functional Edit and Cancel buttons. When the Edit button is clicked, the grid enters into edit mode, as shown in Figure 11-21.

public BaseType[,] Data { get { return CellState; } } public void AssignCellState(int row, int col, object value) { CellState[row, col] = (BaseType)value; } public void AssignCellCalculation(int row, int col, Func<IWorksheet<BaseType>, int, int, BaseType> cb) { Cells[row, col] = cb; } public BaseType GetCellState(int row, int col) { return CellState[row, col]; } public void SetCellState(int row, int col, BaseType val) { CellState[row, col] = val; Cells[row, col] = null; } public void AssignCellCalculation(SheetCoordinate coords, Func<IWorksheet<BaseType>, int, int, BaseType> cb) { AssignCellCalculation(coords.Row, coords.Column, cb); } public void AssignColCalculation(int col, Func<IWorksheet<BaseType>, int, int, BaseType> cb) { ColCells[col] = cb; } public BaseType GetCellState(SheetCoordinate coords) { return GetCellState(coords.Row, coords.Column); } public void SetCellState(SheetCoordinate coords, BaseType val) { SetCellState(coords.Row, coords.Column, val); } public BaseType Calculate(int row, int col) { if (CurrVersion > CalculationVersion[row, col]) { CellState[row, col] = Cells[row, col](this, row, col);

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