add a ported sample from a MS knowledge base

svn path=/trunk/winforms/; revision=62422

datagrid/Makefile

@@ -1,6 +1,6 @@
 all: mono
 
-mono: swf-datagrid.exe related.exe arraylist.exe
+mono: swf-datagrid.exe related.exe arraylist.exe kb318581.exe
 
 SWF_DATAGRID_EXE_SRCS = swf-datagrid.cs swf-datagrid-realsample.cs swf-datagrid-testproperties.cs swf-datagrid-tablenav.cs swf-datagrid-styles.cs swf-datagrid-editinfo.cs swf-datagrid-relations.cs
 

datagrid/kb318581.cs

@@ -0,0 +1,170 @@
+/* C# ported form the VB at http://support.microsoft.com/default.aspx?scid=kb;en-us;Q318581 */
+
+using System;
+using System.ComponentModel;
+using System.Windows.Forms;
+using System.Data;
+
+public class Form1 : System.Windows.Forms.Form
+{
+	DataSet ds = new DataSet ();
+	DataGrid dataGrid1;
+
+	public Form1()
+	{
+		//
+		// Required for Windows Form Designer support
+		//
+		InitializeComponent();
+
+		//
+		// TODO: Add any constructor code after InitializeComponent call
+		//
+	}
+
+		/// <summary>
+		/// Required method for Designer support - do not modify
+		/// the contents of this method with the code editor.
+		/// </summary>
+		private void InitializeComponent()
+		{
+			this.dataGrid1 = new System.Windows.Forms.DataGrid();
+			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
+			this.SuspendLayout();
+			// 
+			// dataGrid1
+			// 
+			this.dataGrid1.DataMember = "";
+			this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
+			this.dataGrid1.Location = new System.Drawing.Point(16, 24);
+			this.dataGrid1.Name = "dataGrid1";
+			this.dataGrid1.ReadOnly = true;
+			this.dataGrid1.Size = new System.Drawing.Size(264, 216);
+			this.dataGrid1.TabIndex = 0;
+
+			// 
+			// Form1
+			// 
+			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
+			this.ClientSize = new System.Drawing.Size(292, 317);
+			this.Controls.Add (this.dataGrid1);
+			this.Name = "Form1";
+			this.Text = "Form1";
+			this.Load += new System.EventHandler(this.Form1_Load);
+			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
+			this.ResumeLayout(false);
+
+		}
+
+	void Form1_Load (object sender, EventArgs e)
+	{
+		/* Generate sample data
+		   Two columns:
+		      Decimal - uses CRTextBoxColumn for column style.
+		      Integer - uses standard DataGridTextBoxColumn for column style.
+		*/
+
+		DataTable dt = new DataTable ();
+		dt.TableName = "TestTable";
+		dt.Columns.Add ("Amount", typeof(Decimal));
+		dt.Columns.Add ("ColB", typeof (Int32));
+		ds.Tables.Add(dt);
+		dt.Rows.Add(new object[] {2, 4});
+		dt.Rows.Add(new object[] {-3.45, 5});
+		dt.Rows.Add(new object[] {4.25, 6});
+		dt.Rows.Add(new object[] {-1.33, 7});
+
+		/*
+		 * Create DataGridTableStyle and DataGridColumnStyle objects
+		 * and add them the the DataGrid.
+		 */
+		DataGridTableStyle ts = new DataGridTableStyle ();
+		DataGridColumnStyle cs;
+
+		/* Add the custom column style. */
+		cs = new CRTextBoxColumn();
+		cs.Width = 120;
+		cs.MappingName = "Amount"; /* Map to decimal column. */
+		cs.HeaderText = "Charge/Payment";
+		ts.GridColumnStyles.Add(cs);
+
+		/* Add the standard column style. */
+		cs = new DataGridTextBoxColumn();
+		cs.Width = 100;
+		cs.MappingName = "ColB"; /* Map to integer column. */
+		cs.HeaderText = "Integer Col";
+		ts.GridColumnStyles.Add(cs);
+
+		ts.MappingName = "TestTable"; /* Map table style to TestTable. */
+		dataGrid1.TableStyles.Add(ts);
+
+		dataGrid1.DataSource = ds;
+		dataGrid1.DataMember = "TestTable";
+	}
+
+
+	class CRTextBoxColumn : DataGridTextBoxColumn {
+
+		protected override object GetColumnValueAtRow (CurrencyManager cm, int RowNum)
+		{
+			/*
+			 * Get data from the underlying record and format for display.
+			 */
+			object oVal = base.GetColumnValueAtRow(cm, RowNum);
+
+			if (oVal is DBNull) {
+				return ""; /* String to display for DBNull. */
+			}
+			else {
+				/* CDec on next statement will throw an exception if this
+				   column style is bound to a column containing non-numeric data. */
+				Decimal Temp = (Decimal)oVal;
+				if (Temp >= 0)
+					return Temp.ToString ("0.00");
+				else
+					return (-Temp).ToString("0.00") + "CR";
+			}
+		}
+
+		protected override bool Commit (CurrencyManager cm, int RowNum)
+		{
+			/*
+			 * Parse the data and write to underlying record.
+			 */
+
+			HideEditBox();   /* return focus to the DataGrid control */
+			DataGridTextBox box = (DataGridTextBox)TextBox;
+			Decimal Value;
+
+			/* Do not write data if not editing. */
+			if (box.IsInEditOrNavigateMode)
+				return true;
+
+			if (TextBox.Text == "") {
+				/* in this example, "" maps to DBNull */
+				SetColumnValueAtRow(cm, RowNum, DBNull.Value);
+			}
+			else {
+				/* Parse the data. */
+				try {
+					if (TextBox.Text.ToUpper().EndsWith("CR"))
+						Value = -Decimal.Parse(TextBox.Text.Substring(0, TextBox.Text.Length - 2));
+					else					
+						Value = Decimal.Parse(TextBox.Text);
+				} catch {
+					return false;
+				}
+				SetColumnValueAtRow(cm, RowNum, Value);   /* Write new value. */
+			}
+
+			EndEdit();   /* Let the DataGrid know that processing is completed. */
+			return true;
+		}
+	}
+
+	[STAThread]
+	static void Main() 
+	{
+		Application.Run(new Form1());
+	}
+}