WPF IDataErrorInfo使用-数据对象上验证
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="344.636" Width="365.422">
<Grid Name="grid">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<StackPanel Grid.Row="0" Grid.ColumnSpan="2" Grid.Column="0" Margin="3" Orientation="Horizontal" VerticalAlignment="Center">
<TextBlock Margin="3">ID:</TextBlock>
<TextBox Name="txtID" Margin="3" MinWidth="100"></TextBox>
<Button Name="btnQuery" Margin="3" MinWidth="50" Click="btnQuery_Click_1">查询</Button>
<Button Name="btnUpdate" Margin="3" MinWidth="50" Click="btnUpdate_Click_1">更新</Button>
<Button Name="btnInsert" Margin="3" MinWidth="50" Click="btnInsert_Click_1">插入</Button>
<Button Name="btnDelete" Margin="3" MinWidth="50" Click="btnDelete_Click_1">删除</Button>
</StackPanel>
<TextBlock Margin="3" Grid.Row="1" Grid.Column="0" VerticalAlignment="Center">CategoryID</TextBlock>
<TextBox Name="txtCategoryID" Margin="3" Grid.Row="1" Grid.Column="1" VerticalAlignment="Center"
Text="{Binding Path=CategoryID}"></TextBox>
<TextBlock Margin="3" Grid.Row="2" Grid.Column="0" VerticalAlignment="Center">ModelNumber</TextBlock>
<TextBox Name="txtModelNumber" Margin="3" Grid.Row="2" Grid.Column="1" VerticalAlignment="Center"
Text="{Binding Path=ModelNumber}"></TextBox>
<TextBlock Margin="3" Grid.Row="3" Grid.Column="0" VerticalAlignment="Center">ModelName</TextBlock>
<TextBox Name="txtModelName" Margin="3" Grid.Row="3" Grid.Column="1" VerticalAlignment="Center"
Text="{Binding Path=ModelName}"></TextBox>
<TextBlock Margin="3" Grid.Row="4" Grid.Column="0" VerticalAlignment="Center">ProductImage</TextBlock>
<TextBox Name="txtProductImage" Margin="4" Grid.Row="4" Grid.Column="1" VerticalAlignment="Center"
Text="{Binding Path=ProductImage}"></TextBox>
<TextBlock Margin="3" Grid.Row="5" Grid.Column="0" VerticalAlignment="Center">UnitCost</TextBlock>
<TextBox Name="txtUnitCost" Margin="3" Grid.Row="5" Grid.Column="1" VerticalAlignment="Center" Validation.Error="txtUnitCost_Error_1">
<TextBox.Text>
<Binding Path="UnitCost" NotifyOnValidationError="true">
<Binding.ValidationRules>
<DataErrorValidationRule></DataErrorValidationRule>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
<TextBox Name="txtDescription" Margin="4" Grid.Row="6" Grid.Column="0" Grid.ColumnSpan="2"
Text="{Binding Path=Description}" TextWrapping="Wrap"></TextBox>
</Grid>
</Window>
using ClassLibrary;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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.Navigation;
using System.Windows.Shapes;
namespace DataBindingExam
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void btnQuery_Click_1(object sender, RoutedEventArgs e)
{
int id = Convert.ToInt32(txtID.Text);
Product p = StoreDB.GetProductByID(id);
grid.DataContext = p;
}
private void btnUpdate_Click_1(object sender, RoutedEventArgs e)
{
int categoryID=Convert.ToInt32(txtCategoryID.Text);
decimal unitCost = Convert.ToDecimal(txtUnitCost.Text);
Product p = new Product()
{
CategoryID = categoryID,
ModelNumber = txtModelNumber.Text,
ModelName = txtModelName.Text,
ProductImage = txtProductImage.Text,
UnitCost = unitCost,
Description = txtDescription.Text
};
int productID = Convert.ToInt32(txtID.Text);
StoreDB.UpdateProductByID(productID, p);
}
private void btnInsert_Click_1(object sender, RoutedEventArgs e)
{
int categoryID = Convert.ToInt32(txtCategoryID.Text);
decimal unitCost = Convert.ToDecimal(txtUnitCost.Text);
Product p = new Product()
{
CategoryID = categoryID,
ModelNumber = txtModelNumber.Text,
ModelName = txtModelName.Text,
ProductImage = txtProductImage.Text,
UnitCost = unitCost,
Description = txtDescription.Text
};
StoreDB.InsertProduct(p);
}
private void btnDelete_Click_1(object sender, RoutedEventArgs e)
{
int productID = Convert.ToInt32(txtID.Text);
StoreDB.DeleteProductByID(productID);
}
private void txtUnitCost_Error_1(object sender, ValidationErrorEventArgs e)
{
if (e.Action==ValidationErrorEventAction.Added)
{
MessageBox.Show(e.Error.ErrorContent.ToString());
}
}
}
}
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ClassLibrary
{
public class StoreDB
{
public static string connString = Properties.Settings.Default.ConnectionString;
public static Product GetProductByID(int id)
{
Product p = null;
SqlConnection con = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand("GetProductByID", con);
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@ProductID", id);
try
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
p = new Product()
{
CategoryID = (int)reader[1],
ModelNumber = reader[2].ToString(),
ModelName = reader[3].ToString(),
ProductImage=reader[4].ToString(),
UnitCost = (decimal)reader[5],
Description = reader[6].ToString()
};
}
return p;
}
catch (Exception)
{
throw;
}
finally
{
con.Close();
}
}
public static void UpdateProductByID(int ProductID,Product p)
{
SqlConnection con = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand("UpdateProductByID", con);
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@ProductID",ProductID);
cmd.Parameters.AddWithValue("@CategoryID",p.CategoryID);
cmd.Parameters.AddWithValue("@ModelNumber",p.ModelNumber);
cmd.Parameters.AddWithValue("@ModelName",p.ModelName);
cmd.Parameters.AddWithValue("@ProductImage",p.ProductImage);
cmd.Parameters.AddWithValue("@UnitCost",p.UnitCost);
cmd.Parameters.AddWithValue("@Description",p.Description);
try
{
con.Open();
cmd.ExecuteNonQuery();
}
catch (Exception)
{
throw;
}
finally
{
con.Close();
}
}
public static void InsertProduct(Product p)
{
SqlConnection con = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand("InsertProduct", con);
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@CategoryID", p.CategoryID);
cmd.Parameters.AddWithValue("@ModelNumber", p.ModelNumber);
cmd.Parameters.AddWithValue("@ModelName", p.ModelName);
cmd.Parameters.AddWithValue("@ProductImage", p.ProductImage);
cmd.Parameters.AddWithValue("@UnitCost", p.UnitCost);
cmd.Parameters.AddWithValue("@Description", p.Description);
try
{
con.Open();
cmd.ExecuteNonQuery();
}
catch (Exception)
{
throw;
}
finally
{
con.Close();
}
}
public static void DeleteProductByID(int id)
{
SqlConnection con = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand("DeleteProductByID", con);
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@ProductID", id);
try
{
con.Open();
cmd.ExecuteNonQuery();
}
catch (Exception)
{
throw;
}
finally
{
con.Close();
}
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ClassLibrary
{
public class Product:IDataErrorInfo
{
public int ProductID { get; set; }
public int CategoryID { get; set; }
public string ModelNumber { get; set; }
public string ModelName { get; set; }
public string ProductImage { get; set; }
public decimal UnitCost { get; set; }
public string Description { get; set; }
public Product(int CategoryID = 0, string ModelNumber = "",
string ModelName = "", string ProductImage = "", decimal UnitCost=0,string Description="")
{
this.CategoryID = CategoryID;
this.ModelNumber = ModelNumber;
this.ModelName = ModelName;
this.ProductImage = ProductImage;
this.UnitCost = UnitCost;
this.Description = Description;
}
public string Error
{
get { return null; }
}
public string this[string columnName]
{
get
{
bool valid = true;
if (columnName=="UnitCost")
{
if (UnitCost<0)
{
valid = false;
}
}
if (!valid)
{
return "UnitCost can not be negative";
}
else
{
return null;
}
}
}
}
}
