Question

客户欢迎页面询问帐户中的客户ID
我想连接两个表单，1当你单击go按钮时，表单将转到表单＃2并将列表显示到表格中。

表格1：从账户表中收取Cid：http://puu.sh/hnp4G/eeb8da0a87.png

   public partial class WelcomeCust : Form 
        {

            OleDbConnection db = new OleDbConnection();
            OleDbDataAdapter da = new OleDbDataAdapter();
            DataTable dt = new DataTable();
            public WelcomeCust()
            {
                InitializeComponent();
                db.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\ChattBankMDB.mdb";
            }

            private void button1_Click(object sender, EventArgs e)
            {
                //Code for looking up the 

                using (OleDbCommand da = new OleDbCommand("select Cid From Accounts", db))
                {
                    db.Open();
                    DataTable schema = db.GetSchema("Tables");
                    List<Accounts> TableNames = new List<Accounts>();
                    foreach (DataRow row in schema.Rows)
                    {
                        TableNames.Add(row[0].ToString());
                    }
    da.Parameters.AddWithValue("@Cid", textBox1.Text);
                    da.ExecuteNonQuery();
                    return TableNames;
                    db.Close();
                }
            }

表单2：显示您的帐户表：http://puu.sh/hnpgr/e1d31930cf.png

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

        private void tableLayoutPanel1_Paint(object sender, PaintEventArgs e)
        {

        }
    }
}

TableNames.Add(row[0].ToString());和return TableNames();也给了我错误。：

Error   2   Argument 1: cannot convert from 'string' to 'ChattBank.Accounts'    

Error   3   Since 'ChattBank.WelcomeCust.button1_Click(object, System.EventArgs)' returns void, a return keyword must not be followed by an object expression

Answer 1

错误非常简单，您的列表期望对象Accounts，但是您传递了一个字符串，并且由于此方法的返回值为void，因此您不应该使用return语句。如果您需要在其他方法中访问TableNames，请尝试将其定义为WelcomeCust类的私有字段

将列表表单连接到生成表

1 个答案: