Question

使用，

Visual Studio 2012 C＃ WPF SQL Server Compact 4.0

我的代码在这里。当我提交我的categoryName时，它会显示

“ExecuteNonQuery：Connection属性尚未初始化”

Plz帮助我。我正在尝试将文本框中的数据添加到数据库中。

    private void btnCategoryAdd_Click(object sender, RoutedEventArgs e)
    {
        con.Open();
        SqlCeCommand com = new SqlCeCommand("INSERT INTO Category_Master(CategoryName) VALUES(@CategoryName)");
        com.Parameters.AddWithValue("@CategoryName", tbCategoryName.Text);

        try
        {
            int affectedRows = com.ExecuteNonQuery();
            if (affectedRows > 0)
            {
                System.Windows.Forms.MessageBox.Show("Insert Success !", System.Windows.Forms.Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Information);
                tbCategoryName.Text = "";
            }
            else
            {
                System.Windows.Forms.MessageBox.Show("Insert Failed !", System.Windows.Forms.Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        catch (Exception ex)
        {
            System.Windows.Forms.MessageBox.Show(ex.Message, System.Windows.Forms.Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        con.Close();
    }

Answer 1

您错过了将连接实例传递给SqlCeCommand

SqlCeCommand com = new SqlCeCommand("INSERT INTO Category_Master(CategoryName) VALUES(@CategoryName)",con);

Answer 2

分配连接属性

com.Connection = con

ExecuteNonQuery：尚未初始化Connection属性。我被卡住了

2 个答案: