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The process is a bit different for Web Forms and Web Services interfaces.
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With the SaveProject() method, the code behind the buttons now becomes quite straightforward. The only difference between the Save and Apply buttons is whether the user control is closed after the data is saved: private void OKButton_Click(object sender, EventArgs e) { SaveProject(false); this.Close(); }
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CHAPTER 9 s WINDOWS FORMS UI
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private void ApplyButton_Click(object sender, EventArgs e) { SaveProject(true); } Recall that the SaveProject() method calls ApplyEdit() on the object before saving it to the database, which applies any changes made by the user. It also calls BeginEdit() before rebinding the object to the UI, so n-level undo is always available. Finally, the object is only rebound to the UI if the rebind parameter is true, so the rebinding is only done when the Apply button is clicked. The Close and Cancel buttons are also quite similar: private void CloseButton_Click(object sender, EventArgs e) { _project.CancelEdit(); this.Close(); } private void Cancel_Button_Click(object sender, EventArgs e) { _project.CancelEdit(); } Both call the CancelEdit() method on the Project object, telling the object to restore its state to the point when BeginEdit() was last called. The only difference is that the Close button causes the user control to be closed, while the Cancel button leaves it open. The call to CancelEdit() in the Close button is important. At first glance, it might seem unnecessary, but remember that in some types of UI, other forms could be displaying this same object at the same time. Calling CancelEdit() here ensures that the displays in those other forms are updated to reflect the reversal of any edits done to the object s state. You can play with the Apply and Cancel buttons to experiment with n-level undo. Run the application and edit a project. Then make some changes to various data, possibly even adding or removing ProjectResource child objects in the DataGridView. Then click the Cancel button to see all your changes go away as the object restores its state to the last BeginEdit() call. Or make some changes, click Apply, and then make some more changes. Then click Cancel to see the object reset itself to the point at which Apply was clicked (because that caused BeginEdit() to be called). Most UI styles don t require the full capabilities of n-level undo, but almost all Windows Forms UI designs need at least single-level undo. The n-level undo capabilities provided by CSLA .NET enable both simple and advanced UI scenarios with a common code base.
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Editing a Resource
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The DataGridView has a FullName column, which is set to be a hyperlink. When the user clicks on an item in this column, the application should open a ResourceEdit user control so the user can view or edit the data for that resource.
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I won t discuss ResourceEdit in detail, but you can look at the code in the download. It is fundamentally equivalent to ProjectEdit in its construction.
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Getting the correct Resource object is easy, because the ProjectResource object implements a GetResource() method. When the user clicks the hyperlink, the code gets the selected ResourceId value from the DataGridView control and passes that value to the ShowEditResource() method on MainForm:
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CHAPTER 9 s WINDOWS FORMS UI
private void ResourcesDataGridView_CellContentClick( object sender, DataGridViewCellEventArgs e) { if (e.ColumnIndex == 1 && e.RowIndex > -1) { int resourceId = int.Parse( this.ResourcesDataGridView.Rows[ e.RowIndex].Cells[0].Value.ToString()); MainForm.Instance.ShowEditResource(resourceId); } } Calling ShowEditResource() is important, because if this Resource object is already being edited in a ResourceEdit user control, then that user control will be made active. Otherwise, the Resource object will be loaded from the database and displayed in a new ResourceEdit user control. The end result is that the user can easily navigate to any of the resources assigned to the project. Comparable functionality exists in the ResourceEdit user control, which allows the user to easily navigate to any project to which the resource is assigned.
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