row(0)是啥意思

[kingzhh]

duwamish7中的代码，business/rules/customer.vb，这是新增记录的代码，当中有句理解不来With customer.Tables(CustomerData.CUSTOMERS_TABLE).Rows(0)，rows(0)是啥意思？（代码下，红色部分）

Public Function Insert (ByVal customer as CustomerData) As Boolean
'
' Check Preconditions
'
ApplicationAssert.CheckCondition(Not customer Is Nothing,"customer Parameter cannot be null",ApplicationAssert.LineNumber)
ApplicationAssert.CheckCondition(customer.Tables(CustomerData.CUSTOMERS_TABLE).Rows.Count = 1,"customer Parameter can only contain 1 row",ApplicationAssert.LineNumber)

Dim tmpCustomer As CustomerData 'used to see if the customer already exists
Dim result as Boolean

With customer.Tables(CustomerData.CUSTOMERS_TABLE).Rows(0)
'
' Do core validation
'
result = Validate (customer.Tables(CustomerData.CUSTOMERS_TABLE).Rows(0))
'
' Do additional validation
'
If Len(.GetColumnError (CustomerData.EMAIL_FIELD)) < 1 Then
'
' Email address passed format verification, now ensure that it
' does not already exist in the database.
'
tmpCustomer = GetCustomerByEmail(CStr(.Item(CustomerData.EMAIL_FIELD)))
If tmpCustomer Is Nothing Then
'email is unique, Save off the new customer
If result Then
With New Customers
result = .InsertCustomer(customer)
End With
End If
Else
'
' Email is not unique, flag the error
'
.SetColumnError(CustomerData.EMAIL_FIELD, CustomerData.EMAIL_FIELD_NOT_UNIQUE) 'email field is not unique
.RowError = CustomerData.INVALID_FIELDS
result = false
End If
End If
End With
'
' Return the result of the operation
'
Insert = result
End Function

[kakajya]

第一行

[华芸智森]

CustomerData 是自定义的一个类或继承DATASET的一个类吧.Rows(0) 指里面TABLE的第零行.

[vlsm]

第一行

[HimeTale]

既然当了程序员，查数就要从0开始

[kingzhh]

可能意思表达不清，我的意思是，这段代码的作用是新增记录时的数据验证，为什么会用.row(0),然道.row(0)代表的是新增的记录?

[zll711]

上面不是写的很清楚吗，customer Parameter can only contain 1 row，
仅仅一行，所以就row（0）了