<Window x:Class="demo.DataGridEditing"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="DataGridEditing" Height="635" Width="517"        xmlns:col="clr-namespace:System.Collections;assembly=mscorlib"        xmlns:sys="clr-namespace:System;assembly=mscorlib"        xmlns:local="clr-namespace:demo">    <Grid>        <DataGrid x:Name="gridProducts" Margin="5" AutoGenerateColumns="False"         >            <DataGrid.Columns>                <DataGridTextColumn Header="Product" Width="175" Binding="{Binding ModelName}"></DataGridTextColumn>                <DataGridTextColumn Header="Price">                    <DataGridTextColumn.Binding>                        <Binding Path="UnitCost" StringFormat="{}{0:C}">                            <Binding.ValidationRules>                                <local:PositivePriceRule Max="999.99" />                            </Binding.ValidationRules>                        </Binding>                    </DataGridTextColumn.Binding>                </DataGridTextColumn>                <DataGridTextColumn Header="Model Number" Binding="{Binding ModelNumber}"></DataGridTextColumn>                <!--设置所属类别下拉框，categoryColumn绑定到ICollection<Category>-->                <DataGridComboBoxColumn Header="Category" x:Name="categoryColumn"    SelectedValueBinding="{Binding Path=CategoryID}"  SelectedValuePath="CategoryID"  DisplayMemberPath="CategoryName"                      ></DataGridComboBoxColumn>                <!--设置日期列-->                <DataGridTemplateColumn Header="Date Added">                    <DataGridTemplateColumn.CellTemplate>                        <DataTemplate>                            <TextBlock Margin="4" VerticalAlignment="Center" Text="{Binding Path=DateAdded, StringFormat={}{0:d}}"></TextBlock>                        </DataTemplate>                    </DataGridTemplateColumn.CellTemplate>                    <DataGridTemplateColumn.CellEditingTemplate>                        <DataTemplate>                            <DatePicker Margin="4" SelectedDate="{Binding Path=DateAdded}"></DatePicker>                        </DataTemplate>                    </DataGridTemplateColumn.CellEditingTemplate>                </DataGridTemplateColumn>            </DataGrid.Columns>        </DataGrid>    </Grid></Window>

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Shapes;using StoreDatabase;namespace demo{    /// <summary>    /// DataGridEditing.xaml 的交互逻辑    /// </summary>    public partial class DataGridEditing : Window    {        public DataGridEditing()        {            InitializeComponent();             //ICollection<Category>            categoryColumn.ItemsSource = App.StoreDb.GetCategories();             //ICollection<Product>             gridProducts.ItemsSource = App.StoreDb.GetProducts();        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data;using System.Data.SqlClient;using System.Collections.ObjectModel;namespace StoreDatabase{    public class StoreDB    {        private string connectionString = StoreDatabase.Properties.Settings.Default.Store;                public ICollection<Product> GetProducts()        {            SqlConnection con = new SqlConnection(connectionString);            SqlCommand cmd = new SqlCommand("GetProducts", con);            cmd.CommandType = CommandType.StoredProcedure;            ObservableCollection<Product> products = new ObservableCollection<Product>();            try            {                con.Open();                SqlDataReader reader = cmd.ExecuteReader();                while (reader.Read())                {                    // Create a Product object that wraps the                     // current record.                    Product product = new Product((string)reader["ModelNumber"],                        (string)reader["ModelName"], (decimal)reader["UnitCost"],                        (string)reader["Description"], (int)reader["ProductID"],                        (string)reader["CategoryName"], (string)reader["ProductImage"]);                    // Add to collection                    products.Add(product);                }            }            finally            {                con.Close();            }            return products;        }        public ICollection<Category> GetCategoriesAndProducts()        {            SqlConnection con = new SqlConnection(connectionString);            SqlCommand cmd = new SqlCommand("GetProducts", con);            cmd.CommandType = CommandType.StoredProcedure;            SqlDataAdapter adapter = new SqlDataAdapter(cmd);            DataSet ds = new DataSet();            adapter.Fill(ds, "Products");            cmd.CommandText = "GetCategories";            adapter.Fill(ds, "Categories");            // Set up a relation between these tables (optional).            DataRelation relCategoryProduct = new DataRelation("CategoryProduct",              ds.Tables["Categories"].Columns["CategoryID"],              ds.Tables["Products"].Columns["CategoryID"]);            ds.Relations.Add(relCategoryProduct);            ObservableCollection<Category> categories = new ObservableCollection<Category>();            foreach (DataRow categoryRow in ds.Tables["Categories"].Rows)            {                ObservableCollection<Product> products = new ObservableCollection<Product>();                foreach (DataRow productRow in categoryRow.GetChildRows(relCategoryProduct))                {                    products.Add(new Product(productRow["ModelNumber"].ToString(),                        productRow["ModelName"].ToString(), (decimal)productRow["UnitCost"],                        productRow["Description"].ToString()));                }                categories.Add(new Category(categoryRow["CategoryName"].ToString(), products));            }            return categories;        }        public ICollection<Category> GetCategories()        {            SqlConnection con = new SqlConnection(connectionString);            SqlCommand cmd = new SqlCommand("GetCategories", con);            cmd.CommandType = CommandType.StoredProcedure;            ObservableCollection<Category> categories = new ObservableCollection<Category>();            try            {                con.Open();                SqlDataReader reader = cmd.ExecuteReader();                while (reader.Read())                {                    // Create a Category object that wraps the                     // current record.                    Category category = new Category((string)reader["CategoryName"], (int)reader["CategoryID"]);                    // Add to collection                    categories.Add(category);                }            }            finally            {                con.Close();            }            return categories;        }    }}

using System;using System.Collections.Generic;using System.Text;using System.Collections.ObjectModel;using System.ComponentModel;namespace StoreDatabase{    public class Category : INotifyPropertyChanged    {        private string categoryName;        public string CategoryName        {            get { return categoryName; }            set            {                categoryName = value;                OnPropertyChanged(new PropertyChangedEventArgs("CategoryName"));            }        }        // For DataGridComboBoxColumn example.        private int categoryID;        public int CategoryID        {            get { return categoryID; }            set            {                categoryID = value;                OnPropertyChanged(new PropertyChangedEventArgs("CategoryID"));            }        }        private ObservableCollection<Product> products;        public ObservableCollection<Product> Products        {            get { return products; }            set            {                products = value;                OnPropertyChanged(new PropertyChangedEventArgs("Products"));            }        }        public event PropertyChangedEventHandler PropertyChanged;        public void OnPropertyChanged(PropertyChangedEventArgs e)        {            if (PropertyChanged != null)                PropertyChanged(this, e);        }        public Category(string categoryName, ObservableCollection<Product> products)        {            CategoryName = categoryName;            Products = products;        }        public Category(string categoryName, int categoryID)        {            CategoryName = categoryName;            CategoryID = categoryID;        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel;namespace StoreDatabase{    public class Product : INotifyPropertyChanged    {        private string modelNumber;        public string ModelNumber        {            get { return modelNumber; }            set            {                modelNumber = value;                OnPropertyChanged(new PropertyChangedEventArgs("ModelNumber"));            }        }        private string modelName;        public string ModelName        {            get { return modelName; }            set            {                modelName = value;                OnPropertyChanged(new PropertyChangedEventArgs("ModelName"));            }        }        private decimal unitCost;        public decimal UnitCost        {            get { return unitCost; }            set            {                unitCost = value;                OnPropertyChanged(new PropertyChangedEventArgs("UnitCost"));            }        }        private string description;        public string Description        {            get { return description; }            set            {                description = value;                OnPropertyChanged(new PropertyChangedEventArgs("Description"));            }        }        private string categoryName;        public string CategoryName        {            get { return categoryName; }            set { categoryName = value; }        }        // For DataGridComboBoxColumn example.        private int categoryID;        public int CategoryID        {            get { return categoryID; }            set { categoryID = value; }        }        private string productImagePath;        public string ProductImagePath        {            get { return productImagePath; }            set { productImagePath = value; }        }        public Product(string modelNumber, string modelName,            decimal unitCost, string description)        {            ModelNumber = modelNumber;            ModelName = modelName;            UnitCost = unitCost;            Description = description;        }        public Product(string modelNumber, string modelName,           decimal unitCost, string description,           string productImagePath)            :           this(modelNumber, modelName, unitCost, description)        {            ProductImagePath = productImagePath;        }        public Product(string modelNumber, string modelName,            decimal unitCost, string description, int categoryID,            string categoryName, string productImagePath) :            this(modelNumber, modelName, unitCost, description)        {            CategoryName = categoryName;            ProductImagePath = productImagePath;            CategoryID = categoryID;        }        public override string ToString()        {            return ModelName + " (" + ModelNumber + ")";        }        public event PropertyChangedEventHandler PropertyChanged;        public void OnPropertyChanged(PropertyChangedEventArgs e)        {            if (PropertyChanged != null)                PropertyChanged(this, e);        }        // This for testing date editing. The value isn‘t actually stored in the database.        private DateTime dateAdded = DateTime.Today;        public DateTime DateAdded        {            get { return dateAdded; }            set { dateAdded = value; }        }    }}

using System;using System.Collections.Generic;using System.Text;using System.Windows.Controls;using System.Globalization;namespace demo{    public class PositivePriceRule : ValidationRule    {        private decimal min = 0;        private decimal max = Decimal.MaxValue;                public decimal Min        {            get { return min; }            set { min = value; }        }        public decimal Max        {            get { return max; }            set { max = value; }        }                      public override ValidationResult Validate(object value, CultureInfo cultureInfo)        {            decimal price = 0;            try            {                if (((string)value).Length > 0)                    // Allow number styles with currency symbols like $.                    price = Decimal.Parse((string)value, System.Globalization.NumberStyles.Any);            }            catch (Exception e)            {                return new ValidationResult(false, "Illegal characters.");            }            if ((price < Min) || (price > Max))            {                return new ValidationResult(false,                  "Not in the range " + Min + " to " + Max + ".");            }            else            {                return new ValidationResult(true, null);            }        }    }}