Question

我对SQL有一点问题，它说“public Form1（）;在代码的最顶端，根据我正在关注的begginers指南，应该有一个带有3个点的小盒子（像这[...]）而不是“;”

public Form1();

        System.Data.SqlClient.SqlConnection con;

        private void Form1_Load(object sender, EventArgs e)
        {
            con = new System.Data.SqlClient.SqlConnection();

            con.ConnectionString="Data Source=.\\SQLEXPRESS;AttachDbFilename=C:\\Users\\Wee                                                                    Jimmy\\Documents\\MyWorkers.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";

            con.Open();

            MessageBox.Show("Open");

            con.Close();

            MessageBox.Show("Closed");

请有人帮忙我准备好了。错误说，错误1'SQL_Connection.Form1.Form1（）'必须声明一个正文，因为它没有标记为abstract，extern或partial C：\用户\ Wee Jimmy \ Documents \ Visual Studio 2010 \ Projects \ SQL Connection \ SQL Connection \ Form1.cs 15 16 SQL连接

Answer 1

更改第一行：

public Form1();

为：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
}

Answer 2

试试这个 -

public Form1()
{
    System.Data.SqlClient.SqlConnection con; 

    private void Form1_Load(object sender, EventArgs e) 
    { 
        con = new System.Data.SqlClient.SqlConnection(); 

        con.ConnectionString="Data Source=.\\SQLEXPRESS;AttachDbFilename=C:\\Users\\Wee Jimmy\\Documents\\MyWorkers.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"; 

        con.Open(); 

        MessageBox.Show("Open"); 

        con.Close(); 

        MessageBox.Show("Closed"); 
    }
}

将SQL数据库连接到C＃

2 个答案: