c# – 数据源中String类型的给定值无法转换为指定目标列的int类

我正在使用一个自定义类：

class Customer
    {
        public int CustomerID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int ShowsNumber { get; set; }
        public int VisitNumber { get; set; }
        public int Cancellation { get; set; }
    }

我读了这样的数据：

List<Customer> customersList =
                (
                    from e in XDocument.Load(file).Root.Elements("cust")
                    select new Customer
                    {
                        CustomerID = (int)e.Attribute("custid"),FirstName = (string)e.Attribute("fname"),LastName = (string)e.Attribute("lname"),ShowsNumber = (int)e.Attribute("count_noshow"),VisitNumber = (int)e.Attribute("count_resos"),Cancellation = (int)e.Attribute("count_cancel"),}).ToList();

然后我将customersList插入到这样的数据表中：

DataTable dataTable = getBasicDataTable();
for (int i = 0; i < customersList.Count; i++)
                {
                    DataRow datarows = dataTable.NewRow();
                    datarows[0] = customersList[i].CustomerID;
                    datarows[1] = customersList[i].FirstName;
                    datarows[2] = customersList[i].LastName;
                    datarows[3] = customersList[i].ShowsNumber;
                    datarows[4] = customersList[i].VisitNumber;
                    datarows[5] = customersList[i].Cancellation;
                    dataTable.Rows.Add(datarows);
                }

然后我将数据插入我的数据库,如下所示：

但我得到了这个例外

using (SqlBulkCopy sbc = new SqlBulkCopy(GetConnectionString()))
            {
                sbc.DestinationTableName = XMLReader.databaseTable;
                sbc.WriteToServer(dataTable);
            }

The given value of type String from the data source cannot be converted to type int of the specified target column.

如你所见,当我从我的xml中提取数据时,我已经使用了强制转换为int和字符串,它正在工作.那么为什么在插入数据库时??我得到了那个例外？

注意

为了给你整个代码,这是getBasicDataTable函数

private DataTable getBasicDataTable()
        {
            DataTable dataTable = new DataTable();
            dataTable.Clear();
            dataTable.Columns.Add("customerID");
            dataTable.Columns.Add("firstName");
            dataTable.Columns.Add("lastName");
            dataTable.Columns.Add("showsNumber");
            dataTable.Columns.Add("visitNumber");
            dataTable.Columns.Add("cancellation");
            return dataTable;
        }