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} 38. Create the event handler for the form s Load event and add this code to add delegates to m_maths and items to the function s ListBox control. A delegate is a type, and as such, you can create an instance of it. You can then add that instance to any collection, such as the SortedList instance used here. In the next section, you ll use the instances to call the AddVectors and SubtractVectors methods. (Create the Load event handler by double-clicking the form in the form designer.) 39. 40. 41. 42. 43. } Add the user interface event methods The vectors on the graph will change as the user changes the values in the NumericUpDown controls and the ListBox control. Each of these controls uses the same System.EventHandler delegate for the value-changing event. That means that the event handler signatures for NumericUpDown.ValueChanged and ListBox.SelectedIndexChanged are the same. You can take advantage of this similarity to assign one method as the event handler for all the change events. 1. Add the following method to the form class to respond to changes in the form controls. 2. private void VectorChanged(object sender, System.EventArgs e) { 3. this.Refresh(); 4. VectorMath theMath = (VectorMath)m_maths[functions.Text]; 5. theMath(this.VectorA, (int)scalar.Value * this.VectorB); } The strings Add , Subtract , and Are equal were used as keys for the VectorMath delegate instances you added to the m_maths SortedList instance. When the delegates are retrieved from the SortedList, they are returned as System.Object types and must be cast to the VectorMath type. private void Form1_Load(object sender, System.EventArgs e) { m_maths.Add("Add", new VectorMath(AddVectors)); m_maths.Add("Subtract", new VectorMath(SubtractVectors)); m_maths.Add("Are equal", new VectorMath(AreEqual)); functions.DataSource = m_maths.Keys; vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. Material resources are consumables that you use up as the project proceeds. On a construction project, material resources might include nails, lumber, and concrete. You work with material resources in Project to track a fixed unit amount or a rate of consumption of the material resource and the associated costs. Although Project is not a complete system for tracking inventory, it can help you stay better informed about how quickly you are consuming your material resources, and at what cost. For the new book project, galley proofs are the consumable resource that interests you most. These are high-fidelity mock-ups of the new book that are created before the book is commercially printed. Because these galley proofs are relatively expensive to have produced, you d like to account for their costs in the project plan. In this exercise, you enter information about a material resource. vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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NET. Free demo download. How to read, scan EAN - 13 linear barcode image in . NET applications ... High-quality barcode reader ; C#, VB . NET sample code ... Once the delegates are cast, you can call the method with the Vector values. Using delegates allows you to call the appropriate method without having to create a switch statement and test on the string Add , Subtract , or Are equal . This means that you could add other calculations easily. 6. Open the form in the form designer and click the Event toolbar button in the Properties window. 7. Select the XVectorA control. 8. Click the Event toolbar button in the Properties window. (It has a lightning bolt on it.) The Properties window now displays the events of the XVectorA control. 9. Locate and click the ValueChanged event in the list. 10. If you click the ValueChanged drop-down arrow, a list of all the methods defined in the class that have signatures that match the event will appear. In this case, the VectorChanged method is in the list. Click it. 11. Repeat steps 3 through 6 for the other NumericUpDown controls. 12. Select the VectorChanged method as the event handler for the SelectedIndexChanged event of the functions ListBox control. Test the application Use the NumericUpDown controls to test the operators. Here are some interesting tests: Add a vector to itself. You get a new vector twice the length in the same direction. Subtract a vector from itself. The result is the (0, 0) vector. Compare A B to A + ( 1 * B). The results are the same. 1. 2. 3. 4. 5. 6 In the Resource Sheet, click the next empty cell in the Resource Name column. Type Bound galley proof. In the Type field, click the down arrow, select Material, and press the Tab key. In the Material Label field, type copy. In the Std. Rate field, type $15 and then press Enter. This is the per-unit cost of this material resource; put another way, each copy of a bound galley proof costs $15. In 9, you ll specify the unit quantity of the material resource when you assign it to tasks. Project will then calculate the cost of the material resource assignment as the per-unit cost that you entered above times the number of units on the assignment. vb.net ean 13 reader VB . NET Image: VB Code to Read and Recognize EAN - 13 Barcode from ...
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