Question

我正在尝试执行查询以在给定ID的情况下从我的数据库中删除书籍记录。当我单击删除按钮时，出现以下错误：

ExecuteNonQuery：尚未初始化Connection属性。

到目前为止我的代码是：

private void btnDelete_Click(object sender, EventArgs e)//delete book
{
    SqlCommand com = new SqlCommand("DELETE FROM [tbl_Book] WHERE Book_ID='"+txtBookID.Text+"'");
    cn.Open();
    com.ExecuteNonQuery();
    cn.Close();
    MessageBox.Show("Book Deleted Successfully", "System", MessageBoxButtons.OK, MessageBoxIcon.Information);                
}

Answer 1

您必须初始化新的sql connection并将其传递给Sql command object。

   private void btnDelete_Click(object sender, EventArgs e)
   {
         Sqlconection connection = new Sqlconection("Your Connection String Here");
         connection.Open();
         SqlCommand com = new SqlCommand("DELETE FROM [tbl_Book] WHERE Book_ID='"+txtBookID.Text+"'", connection);
         com.ExecuteNonQuery();
         connection.Close();
         MessageBox.Show("Book Deleted Successfully", "System", MessageBoxButtons.OK, MessageBoxIcon.Information);
   }

希望这会有所帮助......

Answer 2

您没有绑定command with connection。你可以在构造函数中做到。

SqlCommand com = new SqlCommand("Your Query", connection);

异常错误“ExecuteNonQuery：Connection属性尚未初始化。”这是我的C＃编码

2 个答案: