Question

我在第四行得到了上述错误。我如何（假设我必须）将值转换为双方都具有相同的数据类型？

dsOrderList = objResult.ds
        For Each drow As DataRow In dsOrderList.Tables(0).Rows
            Dim objOrder As New Orders
            objOrder.OrderID = drow("OrderID")
            objOrder.CustomerID = drow("CustomerID")
            objOrder.EmployeeID = drow("EmployeeID")

Answer 1

您需要将dataRow中的值转换为int，string等值，然后再将其赋值给另一个类型为int的变量

Answer 2

我认为你是一个字符串值为整数数组，必须有一个数组或提供数组元素

dsOrderList = objResult.ds
    For Each drow As DataRow In dsOrderList.Tables(0).Rows
        Dim objOrder As New Orders
        objOrder.OrderID(0) = drow("OrderID") '0 is Element of Order ID
        objOrder.CustomerID = drow("CustomerID")
        objOrder.EmployeeID = drow("EmployeeID")

或

dsOrderList = objResult.ds
    For Each drow As DataRow In dsOrderList.Tables(0).Rows
        Dim objOrder As New Orders
        objOrder.OrderID =  {drow("OrderID")}
        objOrder.CustomerID = drow("CustomerID")
        objOrder.EmployeeID = drow("EmployeeID")

更新

如果objOrder.OrderID的元素为空，则使用

objOrder.OrderID = new int() {drow{"OrderID"})

无法将'system.int32'类型的对象强制转换为'system.int32 []'

2 个答案: