.Net C＃输入字符串的格式不正确。 试图将值插入SQL Server数据库中

Question

这是我的C＃代码：

protected void UpdateProduct(object sender, GridViewUpdateEventArgs e) // ⇦ Gridview products update event
{
    string Tax = (GridViewProducts.Rows[e.RowIndex].FindControl("EditTaxDropDown") as DropDownList).SelectedItem.Value;
    string Type = (GridViewProducts.Rows[e.RowIndex].FindControl("EditTypeDropDown") as DropDownList).SelectedItem.Value;
    string Id = GridViewProducts.DataKeys[e.RowIndex].Value.ToString();
    string Name = (GridViewProducts.Rows[e.RowIndex].FindControl("TBName") as TextBox).Text;
    string Description = (GridViewProducts.Rows[e.RowIndex].FindControl("TBDescription") as TextBox).Text;
    string Price = (GridViewProducts.Rows[e.RowIndex].FindControl("TBPrice") as TextBox).Text;

    string SerialNumber = (GridViewProducts.Rows[e.RowIndex].FindControl("TBSerialNumber") as TextBox).Text;

    string strConnString = ConfigurationManager.ConnectionStrings["RegistrationConnectionString"].ConnectionString;

    using (SqlConnection con = new SqlConnection(strConnString))
    {
        string query = "UPDATE Products SET  Name = @Name, Description = @Description, Price = @Price, type = @type, Tax = @Tax, SerialNumber = @SerialNumber, Meta_Modified = GETDATE() WHERE Id = @Id";

        using (SqlCommand cmd = new SqlCommand(query))
        {
            cmd.Connection = con;
            cmd.Parameters.AddWithValue("@Id", Id);
            cmd.Parameters.AddWithValue("@Tax", Tax);
            cmd.Parameters.AddWithValue("@Name", Name);
            cmd.Parameters.AddWithValue("@Description", Description);
            cmd.Parameters.AddWithValue("@Type", Type);
            cmd.Parameters.Add("@Price", SqlDbType.Int, 50).Value = Convert.ToInt32(Price);
            cmd.Parameters.AddWithValue("@SerialNumber", SerialNumber);

            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();

            GridViewProducts.EditIndex = -1;
            BindGridData();
            ProductGWBindData(); //refreshes gridview 
        }
    }
}

这是HTML标记：

<asp:TemplateField HeaderText="Price" SortExpression="Price" >   
    <ItemTemplate>   
         <asp:Label ID="TBPrice" runat="server" Text='<%# Eval("Price", "{0:C2}")%>'></asp:Label>     
    </ItemTemplate>
    <EditItemTemplate>   
         <asp:TextBox  TextMode="Number" step="0.01" ID="TBPrice" runat="server" Text='<%# Eval("Price")%>' ></asp:TextBox>   
    </EditItemTemplate>
</asp:TemplateField>`

如您所见，由于某种原因，我对Price值感兴趣，我无法弄清楚如何将字符串转换为int，我认为这与小数点“ step = 0.01”有关，我可以像1、2这样传递整数3 ...但不是十进制格式1.00，2.00，3.01 ...

请帮助我尝试了各种将字符串转换为int的方法:(

Answer 1

将数据库类型更改为十进制，然后将价格声明为十进制而非字符串。 我认为您的问题出在此代码上：

string Price = (GridViewProducts.Rows[e.RowIndex].FindControl("TBPrice") as TextBox).Text

更改为此：

decimal Price = Convert.ToDecimal((GridViewProducts.Rows[e.RowIndex].FindControl("TBPrice") as TextBox).Text, new CultureInfo("en-US"));

并且您的命令参数应如下所示：

 cmd.Parameters.Add("@Price", Price);

我尚未测试此代码，但我认为解决方案与此类似，请纠正我的错误信息，希望对您有所帮助。