How to Bind an ArrayList to a DataGrid -- 解决ArrayList刷新问题

How to Bind an ArrayList to a DataGrid More Information on installing the .Net Framework click here . Download full Visual Studio C# .NET Examples from this Article.

Overview Here is a technique for binding an arraylist of objects where the objects contain public property that can appear as columns in the datagrid. In this example, the object contains 2 public doubles, one named "RandomValue" and the other named "SqrtValue". To bind this arraylist to a datagrid, add a custom tablestyle that has a MappingName of "ArrayList", and then use the property names as the MappingName for each column. Example using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace Akadia.DataGridArrayList {     public class DataGridArrayList : System.Windows.Forms.Form     {         private System.Windows.Forms.DataGrid dataGrid1;         private ArrayList arrayList1;         private System.Windows.Forms.Button buttonAddNew;         private System.Windows.Forms.Button buttonDeleteCurrent;         private System.ComponentModel.Container components = null;         public DataGridArrayList()         {             InitializeComponent();         }         ...         ...         [STAThread]         static void Main()         {             Application.Run(new DataGridArrayList());         }         // Create and Bind ArrayList to the Datagrid when loading         private void DataGridArrayList_Load (object sender, System.EventArgs e)         {             CreateArrayList();             BindArrayListToGrid();         }         // Create a custom tablestyle and add two columnstyles         private void BindArrayListToGrid()         {             dataGrid1.DataSource = arrayList1;             DataGridTableStyle ts = new DataGridTableStyle();             ts.MappingName = "ArrayList";             int colwidth = (dataGrid1.ClientSize.Width                 - ts.RowHeaderWidth                 - SystemInformation.VerticalScrollBarWidth - 5) / 2;             // Create a column for the "RandomValue" property             // defined in the RandomNumber Class             DataGridTextBoxColumn cs = new DataGridTextBoxColumn();             cs.MappingName = "RandomValue" ;  // Public property name             cs.HeaderText = "Random Number";             cs.Format = "f4";             cs.Width = colwidth;             ts.GridColumnStyles.Add(cs);             // Create a column for the "SqrtValue" property             // defined in the RandomNumber Class             cs = new DataGridTextBoxColumn();             cs.MappingName = "SqrtValue" ;  // Public property name             cs.HeaderText = "Square Root";             cs.Format = "f4";             cs.Width = colwidth;             ts.GridColumnStyles.Add(cs);             // Add the custom tablestyle to the DataGrid             dataGrid1.TableStyles.Clear();             dataGrid1.TableStyles.Add(ts);         }         private void CreateArrayList()         {             arrayList1 = new ArrayList();             // Add some random Numbers             Random r = new Random();             for (int i = 0; i < 20; ++i)             {                 arrayList1.Add(new RandomNumber(r.NextDouble()));             }         }         // Create a struct or class that defines what you want in each row         // the different columns in the row must be public properties         public class RandomNumber         {             private double num;             // Constructor             public RandomNumber(double d)             {                 num = d;             }             // Public Property "RandomValue" used             // as Column in the DataGrid             public double RandomValue             {                 get{ return num; }                 set{ num = value;}             }             // Public Property "SqrtValue" used             // as Column in the DataGrid             public double SqrtValue             {                 get {return Math.Sqrt(this.num);}             }         }         // Add a new random Number to the ArrayList and         // then refresh the DataGrid         private void buttonAddNew_Click(object sender, System.EventArgs e)         {             Random r = new Random();             arrayList1.Add(new RandomNumber(r.NextDouble()));             // Refresh the Datagrid with the new random number             CurrencyManager cm =               (CurrencyManager) this.dataGrid1.BindingContext[arrayList1];             if (cm != null)             {                 cm.Refresh();             }         }         // Delete current Entry from the ArrayList.         private void buttonDeleteCurrent_Click(object sender, System.EventArgs e)         {             // Get the current position due to not allow empty datagrid.             CurrencyManager cm =               (CurrencyManager) this.BindingContext[dataGrid1.DataSource];             if (cm.Count <= 1)             {                 return;  // Do not allow an empty DataGrid             }             // Place cursor on position up             int removeAt = cm.Position;             if (removeAt > 0)             {                 cm.Position = removeAt - 1;             }             // Remove current Entry             arrayList1.RemoveAt(removeAt);             if (cm != null)             {                 cm.Refresh();             }         }         // Select the entire row when the user clicks on a cell in the row         private void dataGrid1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)         {             System.Drawing.Point pt = new Point(e.X, e.Y);             DataGrid.HitTestInfo hti = dataGrid1.HitTest(pt);             if (hti.Type == DataGrid.HitTestType.Cell)             {                 dataGrid1.CurrentCell = new DataGridCell(hti.Row, hti.Column);                 dataGrid1.Select(hti.Row);             }         }     } }   地址：http://www.akadia.com/services/dotnet_arraylist_datagrid.html