如何在Windows窗体应用程序中使用C#.NET正确实现MVC
我一直在网上寻找.NET中MVC设置的示例.我发现了许多例子,但它们在某些方面似乎都有所不同.我有一本关于设计模式的书,描述了MVC起源于Smalltalk,因此我读了几个人讨论它在该语言中的实现.以下是我用自己收集的内容编写的一个示例项目是一个正确的实现,但我对一些细节感到困惑.
我遇到的一个问题是对象构造的正确顺序.这是我的Program.cs中的impl Model mdl = new Model(); Controller ctrl = new Controller(mdl); Application.Run(new Form1(ctrl,mdl)); 风景: public interface IView { double TopSpeed { get; } double ZeroTo60 { get; } int VehicleID { get; } string VehicleName { get; } } /// <summary> /// Assume the form has the following controls /// A button with a click event OnSaveClicked /// A combobox with a selected index changed event OnSelectedIndexChanged /// A textbox that displays the vehicles top speed named mTextTopSpeed /// A textbox that displays the vehicles zero to 60 time named mTextZeroTo60 /// </summary> public partial class Form1 : Form,IView { private IController mController; private IModel mModel; public Form1(IController controller,IModel model) { InitializeComponent(); mController = controller; mController.SetListener(this); mModel = model; mModel.ModelChanged += new ModelUpdated(mModel_ModelChanged); } void mModel_ModelChanged(object sender,EventArgs e) { mTextTopSpeed.Text = mModel.TopSpeed.ToString(); mTextZeroTo60.Text = mModel.ZeroTo60.ToString(); } public double TopSpeed { get { return Double.Parse(mTextTopSpeed.Text); } } public double ZeroTo60 { get { return Double.Parse(mTextZeroTo60.Text); } } public int VehicleID { get { return (int)mComboVehicles.SelectedValue; } } public string VehicleName { get { return mComboVehicles.SelectedText; } } #region Form Events private void OnFormLoad(object sender,EventArgs e) { mComboVehicles.ValueMember = "Key"; mComboVehicles.DisplayMember = "Value"; mComboVehicles.DataSource = new BindingSource(mModel.VehicleList,null); } private void OnSelectedIndexChanged(object sender,EventArgs e) { mController.OnSelectedVehicleChanged(); } private void OnSaveClicked(object sender,EventArgs e) { mController.OnUpdateVehicle(); } #endregion } 控制者: public interface IController { void OnUpdateVehicle(); void OnSelectedVehicleChanged(); void SetListener(IView view); } class Controller : IController { private IModel mModel; private IView mView = null; public Controller(IModel model) { mModel = model; } public void OnUpdateVehicle() { if(mView == null) return; mModel.UpdateVehicle(mView.VehicleID,mView.TopSpeed,mView.ZeroTo60); } public void SetListener(IView view) { mView = view; } public void OnSelectedVehicleChanged() { if (mView == null) return; mModel.SelectVehicle(mView.VehicleID); } } 该模型: public delegate void ModelUpdated(object sender,EventArgs e); public interface IModel { event ModelUpdated ModelChanged; void UpdateVehicle(int id,double topSpeed,double zeroTo60); void SelectVehicle(int id); double TopSpeed { get; } double ZeroTo60 { get; } IDictionary<int,string> VehicleList { get; } } // class for the sake of a pseudo database object class Vehicle { public int ID { get; set; } public string Name { get; set; } public double TopSpeed { get; set; } public double ZeroTo60 { get; set; } public Vehicle(int id,string name,double zeroTo60) { ID = id; Name = name; TopSpeed = topSpeed; ZeroTo60 = zeroTo60; } } class Model : IModel { private List<Vehicle> mVehicles = new List<Vehicle>() { new Vehicle(1,"Civic",120.0,5.0),new Vehicle(2,"Batmobile",9000.0,1.0),new Vehicle(3,"Tricycle",5.0,0.0) }; private Vehicle mCurrentVehicle; public Model() { mCurrentVehicle = mVehicles[0]; } public event ModelUpdated ModelChanged; public void OnModelChanged() { if (ModelChanged != null) { ModelChanged(this,new EventArgs()); } } public double TopSpeed { get { return mCurrentVehicle.TopSpeed; } } public double ZeroTo60 { get { return mCurrentVehicle.ZeroTo60; } } public IDictionary<int,string> VehicleList { get { Dictionary<int,string> vDict = new Dictionary<int,string>(); foreach (Vehicle v in mVehicles) { vDict.Add(v.ID,v.Name); } return vDict as IDictionary<int,string>; } } #region Pseudo Database Calls public void SelectVehicle(int id) { foreach (Vehicle v in mVehicles) { if (v.ID == id) { mCurrentVehicle = v; OnModelChanged(); // send notification to registered views break; } } } public void UpdateVehicle(int id,double zeroTo60) { foreach (Vehicle v in mVehicles) { if (v.ID == id) { mCurrentVehicle.TopSpeed = topSpeed; mCurrentVehicle.ZeroTo60 = zeroTo60; OnModelChanged(); // send notification to registered views break; } } } #endregion } 在这个tl; dr的结论中,我想我正在寻找的是关于我在这里做什么代表一个真正的MVC实现的一些指导,也许是某些人对上述问题有所了解.任何建议将不胜感激.
我们这取决于你想做什么.您目前有一个监督控制器的实现.如果您希望从视图中删除模型(以及任何数据绑定),则可以实现Passive View模式.有关更多差异,请参阅
this文章.
Passive View and Supervising Controller http://i.msdn.microsoft.com/dynimg/IC281772.png 而马丁福勒是国王(GUI Architectures). (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |
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