抱歉，如果已解决。我似乎发现的例子比我需要的要复杂得多
单击“显示所有记录”按钮时，我试图将SQL表的全部内容输出到DatagridView
我有点麻烦，这是我到目前为止所遇到的
private void Button_Click_2(object sender, RoutedEventArgs e)
{
{
string query = "select * from student";
SqlCommand cmd = new SqlCommand(query, con);
con.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(DataGridView);
con.Close();
da.Dispose();
}
这是我所有的代码，如果您需要参考
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;
using System.Data.SqlClient;
using System.Text.RegularExpressions;
namespace WpfApplication4
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True");
public MainWindow()
{
InitializeComponent();
establishConnection();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
Boolean postSuccess = false;
if (validation() == true)
{
SqlCommand details = new SqlCommand("INSERT INTO Student (Firstname, LastName, MatriculationNo, GradeOne, GradeTwo, GradeThree) VALUES (@FirstName, @LastName, @MatriculationNo, @GradeOne, @GradeTwo, @GradeThree)", con);
details.Parameters.AddWithValue("@FirstName", firstnameTextbox.Text);
details.Parameters.AddWithValue("@LastName", lastnameTextbox.Text);
details.Parameters.AddWithValue("@MatriculationNo", matriculationnoTextbox.Text);
details.Parameters.AddWithValue("@GradeOne", Component1Textbox.Text);
details.Parameters.AddWithValue("@GradeTwo", Component2Textbox.Text);
details.Parameters.AddWithValue("@GradeThree", Component3Textbox.Text);
con.Open();
details.ExecuteNonQuery();
postSuccess = true;
if (postSuccess)
{
MessageBox.Show("Details entered succesfully!");
firstnameTextbox.Clear();
lastnameTextbox.Clear();
matriculationnoTextbox.Clear();
Component1Textbox.Clear();
Component2Textbox.Clear();
Component3Textbox.Clear();
}
else
{
MessageBox.Show("Data not entered succesfully, please check DB connection");
}
con.Close();
}
}
private void establishConnection()
{
try
{
con.Open();
System.Diagnostics.Debug.Print("Connected to SQL database");
connectionLabel.Content = "Connected to SQL Database";
con.Close();
}
catch (Exception)
{
connectionLabel.Content = "not connected to sql database";
}
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
firstnameTextbox.Clear(); //Clears the first name textbox
lastnameTextbox.Clear(); //Clears the last name textbox
matriculationnoTextbox.Clear(); //Clears the Matriculation Number textbox
Component1Textbox.Clear(); //Clears the component one textbox
Component2Textbox.Clear(); //Clears the component two textbox
Component3Textbox.Clear(); //Clears the component three textbox
}
private Boolean validation()
{
if (!Regex.Match(firstnameTextbox.Text, "^[A-Z][a-zA-Z]*$").Success)
{
MessageBox.Show("Please Enter a valid First Name");
firstnameTextbox.Clear();
return false;
}
else
{
return true;
}
}
private void Button_Click_3(object sender, RoutedEventArgs e)
{
con.Open();
string sql = @"DELETE FROM Student;"; //Deleting all from Student table
SqlCommand purge = new SqlCommand(sql, con);
MessageBox.Show("Are you sure you want to purge the entire contents of the database?"); //Prompting user to make sure they want to delete
purge.ExecuteNonQuery(); //Execute purge query
}
private void Button_Click_2(object sender, RoutedEventArgs e)
{
{
string query = "select * from student";
SqlCommand cmd = new SqlCommand(query, con);
con.Open();
// create data adapter
SqlDataAdapter da = new SqlDataAdapter(cmd);
// this will query your database and return the result to your datatable
da.Fill(DataGridView);
con.Close();
da.Dispose();
}
}
}
}
任何帮助将不胜感激，谢谢
只需填写DataTable表格并将其绑定到即可GridView.DataContext。
像这样：
首先DataGrid在XAML编辑器中添加<DataGrid Name="customDataGrid" ItemsSource="{Binding}">
然后在后面的代码：
namespace WpfApplication4
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
string connectionString = @"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True";
public MainWindow()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
DataTable table = null;
string query = "select * from student";
try
{
using (SqlConnection connection = new SqlConnection(this.connectionString))
{
connection.Open();
using (SqlDataAdapter adapter = new SqlDataAdapter(query, connection))
{
table = new DataTable();
adapter.Fill(table);
}
}
}
catch (Exception ex)
{
//handle caught exception
}
if (table != null)
{
customDataGrid.DataContext = table.DefaultView;
}
}
}
}
装订部分：
customDataGrid.DataContext = table.DefaultView;
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