Question

我希望获得1天到30天的记录，查询正在SQL正常工作

SELECT * FROM Tbl_order WHERE   date >= DATEADD(day, -1, GETDATE())

所以我在C#中使用了组合框

int CmboDays;

for (CmboDays = -1; CmboDays >= -30; CmboDays--)
            {
                comboBox1.Items.Add(CmboDays);
            }  

        private void orderBySearchDays()
        {
            string c = comboBox1.Text;
            int x = Convert.ToInt32(c);

            using (connection = new SqlConnection(connectionString))
            using (SqlDataAdapter adapter = new SqlDataAdapter("select* from  Tbl_order WHERE date >= DATEADD(day,'"+ x + "', GETDATE()) ; ", connection))
            {                   

                DataTable Tbl_order = new DataTable();
                connection.Open(); //opens the connection
                adapter.Fill(Tbl_order);
                connection.Close(); //Closes the connection

                lst_CustomerNo.DataSource = Tbl_order; //assigns a datasource
                lst_CustomerNo.DisplayMember = "CustomerNo"; //assigns display
                lst_CustomerNo.ValueMember = "CustomerNo";

                lst_OrderName.DataSource = Tbl_order;
                lst_OrderName.DisplayMember = "OrderName";
                lst_OrderName.ValueMember = "OrderName";

                lst_Quantity.DataSource = Tbl_order;
                lst_Quantity.DisplayMember = "Quantity";
                lst_Quantity.ValueMember = "Quantity";

                lst_Price.DataSource = Tbl_order;
                lst_Price.DisplayMember = "Price";
                lst_Price.ValueMember = "Price";

                lst_datetime.DataSource = Tbl_order;
                lst_datetime.DisplayMember = "Date";
                lst_datetime.ValueMember = "Date";

            }
        }

所以所有数据都会显示在列表框中

我收到此错误

类型＆＃39; System.Data.SqlClient.SqlException＆＃39;未处理的异常发生在System.Data.dll
中
附加信息：参数数据类型varchar对于dateadd函数的参数2无效。

我这样做错了吗？如何修复错误？

Answer 1

你可以用x.ToString（）来删除x并删除'

using (SqlDataAdapter adapter = new SqlDataAdapter("select * from  Tbl_order WHERE date >= DATEADD(day,"+ x.ToString() + ", GETDATE()) ; ", connection))

选择记录一天到30天C＃

1 个答案: