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.NET Forum / Windows Forms / WinForm General / August 2005

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DataGrid - InsertAt() - Error Modifying rows after new row inserte

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Dave - 11 Aug 2005 16:15 GMT
After inserting a new data row to a DataTable that is bound to a datagrid, I am
unable to change data in a row that is after the newly added row without
getting
bizarre results.

I have added the full code for the test below.  Create a project drop in the
code and run.

Any help would be appreciated.

Cheers,
Dave

Test #1
======================
1) Click on the row where ID = 1
2) Click "Add Row" button
3) Click on the cell ID = 2 Number = 4
4) Change the number from 4 to 5
5) Move off the row (i.e. hit the down arrow key)
6) Notice there are 2 rows with ID = 2 now
    2, 5, 6
    2, 4, 6

Test #2
======================
1) Click on the row where ID = 1
2) Click "Add Row" button
3) Click "Remove Binding"
4) Click "Add Binding"
5) Click on the cell ID = 2 Number = 4
6) Change the number from 4 to 5
7) Move off the row (i.e. hit the down arrow key)
8) Notice there are 2 rows with ID = 2 now
    2, 5, 6
    2, 4, 6

==========================

using System;
using System.Data;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace Controls
{
    /// <summary>
    /// Summary description for TestDataGrid.
    /// </summary>
    public class TestDataGrid : System.Windows.Forms.Form
    {
        private    int    idCounter            = 100;

        #region Unimportant Window stuff

        private System.Windows.Forms.DataGrid theGrid;
        private System.Windows.Forms.Button addButton;
        private System.Data.DataSet myDataSet;
        private System.Data.DataTable rateTable;
        private System.Data.DataColumn dataColumn1;
        private System.Data.DataColumn dataColumn2;
        private System.Data.DataColumn dataColumn3;
        private System.Windows.Forms.Button removeBinding;
        private System.Windows.Forms.Button addBinding;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        public TestDataGrid()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.theGrid = new System.Windows.Forms.DataGrid();
            this.myDataSet = new System.Data.DataSet();
            this.rateTable = new System.Data.DataTable();
            this.dataColumn1 = new System.Data.DataColumn();
            this.dataColumn2 = new System.Data.DataColumn();
            this.dataColumn3 = new System.Data.DataColumn();
            this.addButton = new System.Windows.Forms.Button();
            this.removeBinding = new System.Windows.Forms.Button();
            this.addBinding = new System.Windows.Forms.Button();
            ((System.ComponentModel.ISupportInitialize)(this.theGrid)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.myDataSet)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.rateTable)).BeginInit();
            this.SuspendLayout();
            //
            // theGrid
            //
            this.theGrid.Anchor =
((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top
| System.Windows.Forms.AnchorStyles.Bottom)
                | System.Windows.Forms.AnchorStyles.Left)
                | System.Windows.Forms.AnchorStyles.Right)));
            this.theGrid.DataMember = "RateTable";
            this.theGrid.DataSource = this.myDataSet;
            this.theGrid.HeaderForeColor = System.Drawing.SystemColors.ControlText;
            this.theGrid.Location = new System.Drawing.Point(8, 40);
            this.theGrid.Name = "theGrid";
            this.theGrid.Size = new System.Drawing.Size(368, 184);
            this.theGrid.TabIndex = 0;
            //
            // myDataSet
            //
            this.myDataSet.DataSetName = "NewDataSet";
            this.myDataSet.Locale = new System.Globalization.CultureInfo("en-US");
            this.myDataSet.Tables.AddRange(new System.Data.DataTable[] {
                                                                         this.rateTable});
            //
            // rateTable
            //
            this.rateTable.Columns.AddRange(new System.Data.DataColumn[] {
                                                                            this.dataColumn1,
                                                                            this.dataColumn2,
                                                                            this.dataColumn3});
            this.rateTable.TableName = "RateTable";
            //
            // dataColumn1
            //
            this.dataColumn1.ColumnName = "ID";
            this.dataColumn1.DataType = typeof(int);
            //
            // dataColumn2
            //
            this.dataColumn2.ColumnName = "Number";
            this.dataColumn2.DataType = typeof(int);
            //
            // dataColumn3
            //
            this.dataColumn3.ColumnName = "Price";
            this.dataColumn3.DataType = typeof(int);
            //
            // addButton
            //
            this.addButton.Anchor =
((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
            this.addButton.Location = new System.Drawing.Point(16, 256);
            this.addButton.Name = "addButton";
            this.addButton.TabIndex = 1;
            this.addButton.Text = "Add Row";
            this.addButton.Click += new System.EventHandler(this.addButton_Click);
            //
            // removeBinding
            //
            this.removeBinding.Anchor =
((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
            this.removeBinding.Location = new System.Drawing.Point(136, 256);
            this.removeBinding.Name = "removeBinding";
            this.removeBinding.Size = new System.Drawing.Size(104, 23);
            this.removeBinding.TabIndex = 3;
            this.removeBinding.Text = "Remove Binding";
            this.removeBinding.Click += new
System.EventHandler(this.removeBinding_Click);
            //
            // addBinding
            //
            this.addBinding.Anchor =
((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
            this.addBinding.Location = new System.Drawing.Point(288, 256);
            this.addBinding.Name = "addBinding";
            this.addBinding.Size = new System.Drawing.Size(104, 23);
            this.addBinding.TabIndex = 4;
            this.addBinding.Text = "Add Binding";
            this.addBinding.Click += new System.EventHandler(this.addBinding_Click);
            //
            // TestDataGrid
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(400, 293);
            this.Controls.Add(this.addBinding);
            this.Controls.Add(this.removeBinding);
            this.Controls.Add(this.addButton);
            this.Controls.Add(this.theGrid);
            this.Name = "TestDataGrid";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "TestDataGrid";
            this.Load += new System.EventHandler(this.TestDataGrid_Load);
            ((System.ComponentModel.ISupportInitialize)(this.theGrid)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.myDataSet)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.rateTable)).EndInit();
            this.ResumeLayout(false);

        }
        #endregion

        #endregion

        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addButton_Click(object sender, System.EventArgs e)
        {
            Random            random        = new Random(idCounter);
           

            DataRow row = rateTable.NewRow();
            int position = theGrid.CurrentRowIndex + 1;

            row[0] = idCounter++;
            row[1] = (int)( random.NextDouble() * 100 );
            row[2] = (int)( random.NextDouble() * 10  );

            rateTable.Rows.InsertAt( row, position );
            rateTable.AcceptChanges();
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void removeBinding_Click(object sender, System.EventArgs e)
        {
            this.theGrid.DataSource = null;
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void addBinding_Click(object sender, System.EventArgs e)
        {
            this.theGrid.DataMember = "RateTable";
            this.theGrid.DataSource = this.myDataSet;
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void TestDataGrid_Load(object sender, System.EventArgs e)
        {
            int        numRows    = 5;
            DataRow row;
           
            for (int i = 0; i < numRows; i++)
            {
                row        = rateTable.NewRow();
                row[0]    = i * 1;
                row[1]    = i * 2;
                row[2]    = i * 3;

                rateTable.Rows.Add( row );
            }
        }
    }
}
Questman - 13 Aug 2005 02:43 GMT
> After inserting a new data row to a DataTable that is bound to a datagrid, I am
> unable to change data in a row that is after the newly added row without
[quoted text clipped - 8 lines]
> Cheers,
> Dave

Sorry this isn't helpful to your question - but I was wondering if you
aren't the same Dave M. who wrote a few BBS games for the Major BBS
platform in the 1989-1993 timeframe?

Rick

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