P交互问题及案例分享(5)

对于具体的View来说，仅仅需要实现ICustomerView，并处理响应控件事件即可（主要是用户从Grid中选择某个记录触发的RowHeaderMouseClick事件，以及点击OK的事件）。实际上不需要View亲自处理这些事件，而仅仅需要触发相应的事件，让事件订阅者（Presenter）来处理就可以了。此外还需要重写CreatePresenter方法完成对CustomerPresenter的创建。CustomerView定义如下：

复制代码 代码如下:

 using System;
 using System.Windows.Forms;

 namespace MVPDemo
 {
     public partial class CustomerView : ViewBase, ICustomerView
     {
         public CustomerView()
         {
             InitializeComponent();           
         }

         protected override object CreatePresenter()
         {
             return new CustomerPresenter(this);
         }

         #region ICustomerView Members

         public event EventHandler<CustomerEventArgs> CustomerSelected;

         public event EventHandler<CustomerEventArgs> CustomerSaving;

         public void ListAllCustomers(Customer[] customers)
         {
             this.dataGridViewCustomers.DataSource = customers;
         }

         public void DisplayCustomerInfo(Customer customer)
         {
             this.buttonOK.Enabled = true;
             this.textBoxId.Text = customer.Id;
             this.textBox1stName.Text = customer.FirstName;
             this.textBoxLastName.Text = customer.LastName;
             this.textBoxAddress.Text = customer.Address;
         }

         public void Clear()
         {
             this.buttonOK.Enabled       = false;
             this.textBox1stName.Text    = string.Empty;
             this.textBoxLastName.Text   = string.Empty;
             this.textBoxAddress.Text    = string.Empty;
             this.textBoxId.Text         = string.Empty;
         }

         #endregion

         protected virtual void OnCustomerSelected(string customerId)
         {
             var previousId = this.textBoxId.Text.Trim();
             if (customerId == previousId)
             {
                 return;
             }
             if(null != this.CustomerSelected)
             {
                 this.CustomerSelected(this, new CustomerEventArgs{ CustomerId = customerId});
             }
         }

         protected virtual void OnCustomerSaving(Customer customer)
         {
             if(null != this.CustomerSaving)
             {
                 this.CustomerSaving(this, new CustomerEventArgs{ Customer = customer});
             }
         }

         private void dataGridViewCustomers_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
         {  
             var currentRow = this.dataGridViewCustomers.Rows[e.RowIndex];
             var customerId = currentRow.Cells[0].Value.ToString();
             this.OnCustomerSelected(customerId);
         }

         private void buttonOK_Click(object sender, EventArgs e)
         {
             var customer        = new Customer();
             customer.Id         = this.textBoxId.Text.Trim();
             customer.FirstName  = this.textBox1stName.Text.Trim();
             customer.LastName   = this.textBoxLastName.Text.Trim();
             customer.Address    = this.textBoxAddress.Text.Trim();
             this.OnCustomerSaving(customer);
         }
     }
 }

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