尝试插入我的数据失败

Question

我正在尝试将一些列表插入我的数据库 (Microsoft)，但我遇到了这个运行时间错误

Failed to convert parameter value from a List`1 to a Int32.

这是我的代码

  public void InsertInventory(DateTime _date, int _customer_Id,
                            int _employee_Id, List<int> _product_Id,
                            List<int> _amountSold,
                            List<int> _unitPrice, List<int> _totalPrice)
    {
        Connection_String = @"Data Source=MOSTAFA-PC;Initial Catalog="
                           + "Sales and Inventory System"
                           + ";Integrated Security=TrueData Source=MOSTAFA-PC;Initial Catalog="
                           + "Sales and Inventory System"
                           + ";Integrated Security=True;";

        Query = "insert into Inventory" +
                  "(Customer_Id,Employee_Id,Product_Id,[Date],[Amount Sold],[Unit Price],[Total Price])" +
                    "values (@customer_id,@Employee_id,@Product_id,@[Date],@[Amount_Sold],@[Unit_Price],@[Total_Price])";

        using (Con = new SqlConnection(Connection_String))
        using (Cmd = new SqlCommand(Query, Con))
        {
            Cmd.Parameters.Add("@customer_id", SqlDbType.Int);
            Cmd.Parameters.Add("@Employee_id", SqlDbType.Int);
            Cmd.Parameters.Add("@Product_id", SqlDbType.Int);
           //Cmd.Parameters.Add("@[Date]", SqlDbType.NVarChar);
            Cmd.Parameters.Add("@[Date]", SqlDbType.Date);
            Cmd.Parameters.Add("@[Amount_sold]", SqlDbType.Int);
            Cmd.Parameters.Add("@[Unit_Price]", SqlDbType.Decimal);
            Cmd.Parameters.Add("@Total_Price", SqlDbType.Decimal);

            Cmd.Connection = Con;
            Con.Open();

            int RecordToAdd = _product_Id.Count;
            for (int i = 0; i < RecordToAdd; i++)
            {
                Cmd.Parameters["@customer_id"].Value = _customer_Id;
                Cmd.Parameters["@Employee_id"].Value = _employee_Id;
                Cmd.Parameters["@Product_id"].Value = _product_Id;
                Cmd.Parameters["@[Date]"].Value = _date;
                Cmd.Parameters["@[Amount_sold]"].Value = _amountSold;
                Cmd.Parameters["@[Unit_Price]"].Value = _unitPrice;
                Cmd.Parameters["@Total_Price"].Value = _totalPrice;
                Cmd.ExecuteNonQuery();
            }

我搜索了网站，但找不到任何有用的或与我的问题类似的东西

我该怎么办？

Answer 1

将 FUNCTION PARAMETERS 中的 "List<>" 更改为 Int32 或 Integer。

Answer 2

改变这个：

        int RecordToAdd = _product_Id.Count;
        for (int i = 0; i < RecordToAdd; i++)
        {
            Cmd.Parameters["@customer_id"].Value = _customer_Id;
            Cmd.Parameters["@Employee_id"].Value = _employee_Id;
            Cmd.Parameters["@Product_id"].Value = _product_Id;
            Cmd.Parameters["@[Date]"].Value = _date;
            Cmd.Parameters["@[Amount_sold]"].Value = _amountSold;
            Cmd.Parameters["@[Unit_Price]"].Value = _unitPrice;
            Cmd.Parameters["@Total_Price"].Value = _totalPrice;
            Cmd.ExecuteNonQuery();
        }

为此：

        int RecordToAdd = _product_Id.Count;
        for (int i = 0; i < RecordToAdd; i++)
        {
            Cmd.Parameters["@customer_id"].Value = _customer_Id;
            Cmd.Parameters["@Employee_id"].Value = _employee_Id;
            Cmd.Parameters["@Product_id"].Value = _product_Id[i];
            Cmd.Parameters["@[Date]"].Value = _date;
            Cmd.Parameters["@[Amount_sold]"].Value = _amountSold[i];
            Cmd.Parameters["@[Unit_Price]"].Value = _unitPrice[i];
            Cmd.Parameters["@Total_Price"].Value = _totalPrice[i];
            Cmd.ExecuteNonQuery();
        }

请注意，在第二个块中，我使用循环的迭代器来索引我每次插入的列表中的项目。

编辑：此外，您构建的 connection_string 看起来不正确。您可能需要查看并更正任何错误

尝试插入我的数据失败

Failed trying to insert my data

c#

mysql

runtime-error

winforms

runtimeexception