productsform.cs

来自「微软（Microsoft）出版社C井练习文件及解答」· CS 代码 · 共 111 行

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

namespace ProductsMaintenance
{
    public partial class ProductsForm : Form
    {
        public ProductsForm()
        {
            InitializeComponent();
        }

        private void ProductsForm_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'northwindDataSet.Products' table. You can move, or remove it, as needed.
            this.productsTableAdapter.Fill(this.northwindDataSet.Products);
            // TODO: This line of code loads data into the 'northwindDataSet.Suppliers' table. You can move, or remove it, as needed.
            this.suppliersTableAdapter.Fill(this.northwindDataSet.Suppliers);
            // TODO: This line of code loads data into the 'northwindDataSet.NumProductsTable' table. You can move, or remove it, as needed.
            this.numProductsTableTableAdapter.Fill(this.northwindDataSet.NumProductsTable);

        }

        private void productsGrid_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
        {
            int newInteger;
            productsGrid.Rows[e.RowIndex].ErrorText = "";
            if ((productsGrid.Columns[e.ColumnIndex].DataPropertyName == "UnitsInStock") ||
                (productsGrid.Columns[e.ColumnIndex].DataPropertyName == "UnitsOnOrder") ||
                (productsGrid.Columns[e.ColumnIndex].DataPropertyName == "ReorderLevel"))
            {
                if (!int.TryParse(e.FormattedValue.ToString(), out newInteger) ||
                    newInteger < 0)
                {
                    productsGrid.Rows[e.RowIndex].ErrorText =
                              "Value must be a non-negative number";
                    e.Cancel = true;
                }
            }
        }

        private void productsGrid_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            productsGrid.Rows[e.RowIndex].ErrorText = "";
        }

        private void productsGrid_DataError(object sender, DataGridViewDataErrorEventArgs e)
        {
            productsGrid.Rows[e.RowIndex].ErrorText = "Invalid input, please re-enter";
            e.Cancel = true;
        }

        private void saveButton_Click(object sender, EventArgs e)
        {
            try
            {
                NorthwindDataSet changes = (NorthwindDataSet)northwindDataSet.GetChanges();
                if (changes == null)
                {
                    return;
                }

                DataTable dt = changes.Tables["Products"];
                DataRow[] badRows = dt.GetErrors();

                if (badRows.Length == 0)
                {
                    int numRows = productsTableAdapter.Update(changes);
                    MessageBox.Show("Updated " + numRows + " rows", "Success");
                    northwindDataSet.AcceptChanges();

                }
                else
                {
                    string errorMsg = null;
                    foreach (DataRow row in badRows)
                    {
                        foreach (DataColumn col in row.GetColumnsInError())
                        {
                            errorMsg += row.GetColumnError(col) + "\n";
                        }
                    }
                    MessageBox.Show("Errors in data: " + errorMsg,
                                    "Please fix", MessageBoxButtons.OK,
                                    MessageBoxIcon.Error);

                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: " + ex.Message, "Errors",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                northwindDataSet.RejectChanges();
            }
        }

        //private void queryButton_Click(object sender, EventArgs e)
        //{
        //    NorthwindDataSetTableAdapters.ProductsTableAdapter productsTA =
        //        new NorthwindDataSetTableAdapters.ProductsTableAdapter();
        //    productsTA.Fill(northwindDataSet.Products);
        //    BindingSource productsBS = new BindingSource(northwindDataSet, "Products");
        //    productsGrid.DataSource = productsBS;
        //}
    }
}