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当我在第二行中选择一个项目时，第一行会发生变化，并且第一行中的选定项目会发生变化并复制我在第二行中选择的内容

我只想问，如何消除这些变化？

我不知道是不是因为清除了里面的物品ComboBox，如果我删除column.Items.Clear()它运行良好，但我还需要清除里面的物品ComboBox

public partial class MultipleEntry : Form
{
    DataGridViewComboBoxColumn col1 = new DataGridViewComboBoxColumn();
    DataGridViewComboBoxColumn col2 = new DataGridViewComboBoxColumn();
    DataGridViewComboBoxColumn col3 = new DataGridViewComboBoxColumn();
    DataGridViewTextBoxColumn col4 = new DataGridViewTextBoxColumn();
    DataGridViewComboBoxColumn col5 = new DataGridViewComboBoxColumn();
    DataGridViewTextBoxColumn col6 = new DataGridViewTextBoxColumn();
    DataGridViewComboBoxColumn col7 = new DataGridViewComboBoxColumn();
    DataGridViewTextBoxColumn col8 = new DataGridViewTextBoxColumn();

    public MultipleEntry()
    {
        InitializeComponent();
    }

    private void UNA()
    {
        string strQuery = "Select TypeName from TYPE where delType='False'";
        OleDbDataAdapter adap = new OleDbDataAdapter(strQuery, Program.objConn);
        OleDbCommandBuilder build = new OleDbCommandBuilder(adap);
        DataTable dt = new DataTable();
        adap.Fill(dt);
        BindingSource bind = new BindingSource();
        bind.DataSource = dt;

        //Type
        col1.DataPropertyName = "TypeName";
        col1.HeaderText = "Type";
        col1.Width = 100;
        col1.DataSource = bind;
        col1.ValueMember = "TypeName";
        col1.DisplayMember = "TypeName";
        grdMultiple.Columns.Add(col1);

        //Category
        col2.DataPropertyName = "CategoryName";
        col2.HeaderText = "Category";
        col2.Width = 100;
        grdMultiple.Columns.Add(col2);

        //Product Description
        col3.DataPropertyName = "ProductDetails";
        col3.HeaderText = "Product";
        col3.Width = 150;
        grdMultiple.Columns.Add(col3);

        //Unit
        col5.DataPropertyName = "UnitName";
        col5.HeaderText = "Unit";
        col5.Width = 75;
        grdMultiple.Columns.Add(col5);

        //Supplier
        col7.HeaderText = "Supplier";
        col7.Width = 150;
        grdMultiple.Columns.Add(col7);


        //Quantity
        col4.HeaderText = "Qty";
        col4.Width = 75;
        grdMultiple.Columns.Add(col4);

        //Price
        col8.HeaderText = "Price";
        col8.Width = 75;
        grdMultiple.Columns.Add(col8);

        //Serial Number
        col6.HeaderText = "Serial No";
        col6.Width = 80;
        grdMultiple.Columns.Add(col6);
    }

    private void MultipleEntry_Load(object sender, EventArgs e)
    {
        //try
        //{
            Program.objConn = new OleDbConnection(Program.Connection);
            Program.objConn.Open();
            UNA();
        //}
        //catch (Exception ex)
        //{
        //    MessageBox.Show(ex.Message);
        //}
    }

    string value;
    private void grdMultiple_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        try
        {

            int index = grdMultiple.CurrentCell.RowIndex;   
            if(e.ColumnIndex==0)
            {
                MessageBox.Show(e.ColumnIndex.ToString() + e.RowIndex.ToString());
                object newValue = grdMultiple.CurrentRow.Cells[0].Value;
                value = newValue.ToString();
                MessageBox.Show(value);
                string one = "select c.CategoryName,t.TypeName from CATEGORY c inner join PRODUCT p on p.CategoryNo = c.CategoryNo inner join TYPE t on t.TypeNo=p.TypeNo where t.TypeName='" + value + "'";
                OleDbCommand cmdone = new OleDbCommand(one, Program.objConn);
                OleDbDataReader rdrOne = cmdone.ExecuteReader();
                col2.Items.Clear();
                while (rdrOne.Read())
                {
                    col2.Items.Add(rdrOne[0].ToString());
                }
            }
            else if (e.ColumnIndex == 1 && e.RowIndex >=1)
            {
                MessageBox.Show(e.ColumnIndex.ToString() + e.RowIndex.ToString());
                string one = "select c.CategoryName,t.TypeName from CATEGORY c inner join PRODUCT p on p.CategoryNo = c.CategoryNo inner join TYPE t on t.TypeNo=p.TypeNo where t.TypeName='" + value + "'";
                OleDbCommand cmdone = new OleDbCommand(one, Program.objConn);
                OleDbDataReader rdrOne = cmdone.ExecuteReader();

                while (rdrOne.Read())
                {
                    col2.Items.Add(rdrOne[0].ToString());
                }
            }
            else if (e.ColumnIndex == 2 && e.RowIndex >= 1)
            {
                MessageBox.Show(e.ColumnIndex.ToString() + e.RowIndex.ToString());
                col3.Items.Clear();
                object newTwo = grdMultiple.CurrentRow.Cells[1].Value;
                //MessageBox.Show(newTwo.ToString());
                string two = "select p.ProductDetails,c.CategoryName from PRODUCT p inner join Category c on c.CategoryNo = p.CategoryNo where c.CategoryName='" + newTwo.ToString() + "'";
                OleDbCommand cmdtwo = new OleDbCommand(two, Program.objConn);
                OleDbDataReader rdrtwo = cmdtwo.ExecuteReader();
                while (rdrtwo.Read())
                {
                    col3.Items.Add(rdrtwo[0].ToString());
                }
            }
            else if (e.ColumnIndex == 3 && e.RowIndex >= 1)
            {
                MessageBox.Show(e.ColumnIndex.ToString() + e.RowIndex.ToString());
                col5.Items.Clear();
                string three = "select u.UnitName from UNIT u";
                OleDbCommand cmdThree = new OleDbCommand(three, Program.objConn);
                OleDbDataReader rdrThree = cmdThree.ExecuteReader();
                while (rdrThree.Read())
                {
                    col5.Items.Add(rdrThree[0].ToString());
                }   
            }
            else if (e.ColumnIndex == 4 && e.RowIndex >= 1)
            {
                MessageBox.Show(e.ColumnIndex.ToString() + e.RowIndex.ToString());
                col7.Items.Clear();
                string four = "select SupplierCompany from SUPPLIER";
                OleDbCommand cmdFour = new OleDbCommand(four, Program.objConn);
                OleDbDataReader rdrFour = cmdFour.ExecuteReader();
                while (rdrFour.Read())
                {
                    col7.Items.Add(rdrFour[0].ToString());
                } 
            }
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}
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1 回答 1

2

这里的问题是您DataGridViewComboBoxColumn.Items不正确地使用财产。此属性用于访问该列中所有单元格的值集合，因此每当您调用 时col2.Items.Clear()，您都会清除整个列中的组合框。要单独访问单元格的值集合，您应该执行以下操作：

//get the cell in selected row in 2nd column
var cell2 = (DataGridViewComboBoxCell)grdMultiple.Rows[index].Cells[2];
//clear the combo box value collection only for this cell
cell2.Items.Clear()
//do the rest accessing the cell's value collection like in the previous line

希望这能解决您的问题。

PS你应该回到e.RowIndex == index在if语句中使用。

于 2013-02-03T13:30:23.730 回答