我有一个可以正常工作的功能iTrac.SalesOrder.SalesOrdersByBody_JB，当我尝试从Web服务调用它时，它失败并引发异常
“'iTrac.SalesOrder'的类型初始值设定项引发了异常。”
我看到这是一个相当普遍的情况，我确实经历了所有类似的问题，但是我没有看到问题的任何答案，或者也许我是一个新手，无法识别答案...？< / p>
经历了所有类似的问题。
Private Sub BrowserMailSender(obj As Object, e As EventArgs)
Dim x As New List(Of iTrac.JBSODetail)
Try
FileIO.WriteToFile("service is started:" + Now + vbNewLine)
x = iTrac.SalesOrder.SalesOrdersByBody_JB(241)
FileIO.WriteToFile(x.ToString)
Catch ex As Exception
FileIO.WriteToFile(ex.Message + vbNewLine)
End Try
End Sub
引发异常的功能
Public Shared Function SalesOrdersByBody_JB(ByVal BodyID As String) As List(Of JBSODetail)
Dim SalesOrderList As New List(Of JBSODetail)
Using context = New iTracContext
Dim BOMList = New List(Of Integer)
Dim StatusList As New List(Of String)
BOMList = context.BillOfMaterials.Where(Function(b) b.Child =
BodyID And b.ParentClass = "RTS").Select(Function(b)
b.Parent).ToList
If BOMList Is Nothing Then
Return Nothing
Else
StatusList.Add("OPEN")
StatusList.Add("HOLD")
StatusList.Add("BACKORDER")
End If
Dim query =context.JBSODetails.Include
("Part").Include("SOHeader").AsQueryable
If Not String.IsNullOrEmpty(BodyID) Then
query = query.Where(Function(s)
BOMList.Contains(s.pid) And
StatusList.Contains(s.status.ToUpper))
End If
Return query.OrderBy(Function(s) s.promised_date).ToList
End Using
End Function
Imports System.Data.SqlClient
Imports System.ComponentModel.DataAnnotations
Imports iTrac
<Table("tblSODetails")>
Public Class SalesOrder
<Key()>
Public Property sid As Decimal
Public Property SalesOrderNumber As String
Public Property SalesOrderLine As String
Public Property NeedDate As Date
Public Property PromisedDate As Date
Public Property ShipTo As String
Public Property Customer As String
<Column("UnitPriceOfOrder")>
Public Property UnitPrice As Decimal?
<Column("PriceUnitOfOrder")>
Public Property PriceUnit As String
Public Property OrderQuantity As Decimal?
Public Property OrderBalance As Decimal?
Public Property OrderEntryDate As Date
<Column("Material")>
Public Property CustomerPartNumber As String
Public Property LastUpdated As Date
Public Property CustomerPO As String
<NotMapped()>
Public Property NormalizedPartNumber As String
Public Property OfficeNote As String
Public Property pid As Integer?
Public Property aid As Integer?
Public Property cid As Integer?
Public Property TransferTime As Date
Public Property ShipVia As String
<NotMapped>
Public Property RunningTotal As Integer?
<ForeignKey("pid")>
Public Property Inventory As CompiledInventory
<ForeignKey("pid")>
Public Property Part As Part
<NotMapped()>
Public Property RTS
<NotMapped()>
Public Property Plate
<NotMapped()>
Public Property Machined
<NotMapped()>
Public Property Status
Private Shared ConnectionString As String = BrowserUtilities.Settings.ConnectionString
Public ReadOnly Property Blocked As Boolean
Get
Return ShippingBlock.BlockExists(SalesOrderNumber, SalesOrderLine)
End Get
End Property
Public Shared Function OpenSalesOrderList(ByVal CustomerName As String,
ByVal ShipToAddress As String,
ByVal CustomerPartNumber As String,
ByVal CutOffDate As String,
ByVal NormalizedID As String,
ByVal UpdatedWindow As String,
Optional ByVal CustomerPO As String = "") As List(Of SalesOrder)
Dim SalesOrderList As New List(Of SalesOrder)
Using Connection As New SqlConnection(ConnectionString)
Connection.Open()
Dim sqlString = ""
Dim sqlWhereClause = ""
If CustomerName <> "" Then
sqlWhereClause = " where customer = '" & CustomerName & "'"
End If
If ShipToAddress <> "" Then
If sqlWhereClause > "" Then
sqlWhereClause += " and shipto = '"
Else
sqlWhereClause += " where shipto = '"
End If
sqlWhereClause += ShipToAddress + "'"
End If
If CustomerPartNumber <> "" Then
If sqlWhereClause > "" Then
sqlWhereClause += " and material like '"
Else
sqlWhereClause += " where material like '"
End If
sqlWhereClause += CustomerPartNumber + "'"
End If
If CustomerPO <> "" Then
If sqlWhereClause > "" Then
sqlWhereClause += " and customerpo = '"
Else
sqlWhereClause += " where customerpo = '"
End If
sqlWhereClause += CustomerPO + "'"
End If
If NormalizedID <> "" Then
If NormalizedID <> "0" Then
If sqlWhereClause > "" Then
sqlWhereClause += " and pid = '"
Else
sqlWhereClause += " where pid = '"
End If
sqlWhereClause += NormalizedID + "'"
End If
End If
If CutOffDate <> "" And CustomerPO = "" Then
If sqlWhereClause > "" Then
sqlWhereClause += " and promiseddate <= '"
Else
sqlWhereClause += " where promiseddate <= '"
End If
sqlWhereClause += CutOffDate + "'"
End If
If UpdatedWindow <> "" Then
If sqlWhereClause > "" Then
sqlWhereClause += " and "
Else
sqlWhereClause += "where "
End If
sqlWhereClause += "lastupdated between '" & Now.AddHours(-Val(UpdatedWindow)) & "' and '" & Now & "'"
End If
sqlString = "Select s.*, (select NormalizedPartNumber from tblPart where id = pid) as NormalizedPartNumber from tblSODetails as s" & sqlWhereClause
If UpdatedWindow <> "" Then
sqlString += " order by customer, normalizedpartnumber, promiseddate"
Else
sqlString += " order by promiseddate"
End If
Dim command = New SqlCommand(sqlString, Connection)
Dim dataReader As SqlDataReader = command.ExecuteReader()
While dataReader.Read()
Dim so = New SalesOrder()
so.MapDataReader(dataReader, 1)
SalesOrderList.Add(so)
End While
End Using
Return SalesOrderList
End Function
Private Sub MapDataReader(ByVal dataReader As IDataReader, ByVal Method As Integer)
Select Case Method
Case 0, 1
sid = If(IsDBNull(dataReader("sid")), "", dataReader("sid"))
SalesOrderNumber = If(IsDBNull(dataReader("salesordernumber")), "", dataReader("salesordernumber"))
SalesOrderLine = If(IsDBNull(dataReader("salesorderline")), "", dataReader("salesorderline"))
PromisedDate = If(IsDBNull(dataReader("promiseddate")), "", dataReader("promiseddate"))
ShipTo = If(IsDBNull(dataReader("shipto")), "", dataReader("shipto"))
Customer = If(IsDBNull(dataReader("customer")), "", dataReader("customer"))
UnitPrice = If(IsDBNull(dataReader("unitpriceoforder")), 0, dataReader("unitpriceoforder"))
PriceUnit = If(IsDBNull(dataReader("priceunitoforder")), "", dataReader("priceunitoforder"))
OrderQuantity = If(IsDBNull(dataReader("orderquantity")), "", dataReader("orderquantity"))
OrderBalance = If(IsDBNull(dataReader("orderbalance")), "", dataReader("orderbalance"))
OrderEntryDate = If(IsDBNull(dataReader("orderentrydate")), "", dataReader("orderentrydate"))
CustomerPartNumber = If(IsDBNull(dataReader("material")), "", dataReader("material"))
LastUpdated = If(IsDBNull(dataReader("lastupdated")), "", dataReader("lastupdated"))
CustomerPO = If(IsDBNull(dataReader("customerpo")), "", dataReader("customerpo"))
OfficeNote = If(IsDBNull(dataReader("officenote")), "", dataReader("officenote"))
pid = If(IsDBNull(dataReader("pid")), 0, dataReader("pid"))
aid = If(IsDBNull(dataReader("aid")), 0, dataReader("aid"))
cid = If(IsDBNull(dataReader("cid")), 0, dataReader("cid"))
TransferTime = dataReader("transfertime")
ShipVia = If(IsDBNull(dataReader("shipvia")), "", dataReader("shipvia"))
NeedDate = If(IsDBNull(dataReader("new_promised_date")), dataReader("promiseddate"), dataReader("new_promised_date"))
If Method = 1 Then NormalizedPartNumber = If(IsDBNull(dataReader("normalizedpartnumber")), "", dataReader("normalizedpartnumber"))
Case 2
Customer = If(IsDBNull(dataReader("customer")), "Unknown", dataReader("customer"))
End Select
End Sub
Public Shared Function SalesOrdersByBody(ByVal BodyID As String, ByVal CustomerPartNumber As String) As List(Of SalesOrder)
Dim SalesOrderList As New List(Of SalesOrder)
Dim CP As New Part
Using Connection As New SqlConnection(ConnectionString)
Dim sqlString = ""
Connection.Open()
If BodyID > "" Then
sqlString = "Select s.*, d.new_promised_date from tblPart as p " &
"inner join tblSODetails as s on p.id = s.pid " &
"inner join tblJBSODetails d on d.sales_order = s.salesordernumber " &
"inner join tblBillOfMaterial as b on p.id = b.parent and parentclass = 'rts' " &
"where b.child = " & BodyID & " order by s.promiseddate"
Else
sqlString = "Select s.*, d.new_promised_date from tblPart as p " &
"inner join tblSODetails as s on s.pid = p.id " &
"inner join tblJBSODetails d on d.sales_order = s.salesordernumber " &
"where p.CustomerPartNumber = '" & CustomerPartNumber & "' " &
"order by s.promiseddate"
End If
Dim command = New SqlCommand(sqlString, Connection)
Dim dataReader As SqlDataReader = command.ExecuteReader()
While dataReader.Read()
Dim so = New SalesOrder()
so.MapDataReader(dataReader, 0)
SalesOrderList.Add(so)
End While
End Using
Return SalesOrderList
End Function
Public Shared Function SalesOrdersByBody_JB(ByVal BodyID As String) As List(Of JBSODetail)
Dim SalesOrderList As New List(Of JBSODetail)
Using context = New iTracContext
Dim BOMList = New List(Of Integer)
Dim StatusList As New List(Of String)
BOMList = context.BillOfMaterials.Where(Function(b) b.Child = BodyID And b.ParentClass = "RTS").Select(Function(b) b.Parent).ToList
If BOMList Is Nothing Then
Return Nothing
Else
StatusList.Add("OPEN")
StatusList.Add("HOLD")
StatusList.Add("BACKORDER")
End If
Dim query = context.JBSODetails.Include("Part").Include("SOHeader").AsQueryable
If Not String.IsNullOrEmpty(BodyID) Then
query = query.Where(Function(s) BOMList.Contains(s.pid) And StatusList.Contains(s.status.ToUpper))
End If
Return query.OrderBy(Function(s) s.promised_date).ToList
End Using
End Function
Public Shared Function SalesOrdersByPartID(ByVal PartID As Integer) As List(Of SalesOrder)
Dim SalesOrderList As New List(Of SalesOrder)
Using Connection As New SqlConnection(ConnectionString)
Dim sqlString = ""
Connection.Open()
sqlString = "Select s.*, d.new_promised_date from tblPart as p " &
"inner join tblSODetails as s on p.id = s.pid " &
"inner join tblJBSODetails d on d.sales_order = s.salesordernumber " &
"inner join tblBillOfMaterial as b on p.id = b.parent and parentclass = 'rts' " &
"where b.parent = " & PartID & " order by s.promiseddate"
Dim command = New SqlCommand(sqlString, Connection)
Dim dataReader As SqlDataReader = command.ExecuteReader()
While dataReader.Read()
Dim so = New SalesOrder()
so.MapDataReader(dataReader, 0)
SalesOrderList.Add(so)
End While
End Using
Return SalesOrderList
'Using context = New iTracContext
' Return context.SalesOrders.Where(Function(s) s.pid = PartID).ToList
'End Using
End Function
Public Shared Function SalesOrdersByPartID_JB(ByVal PartID As Integer) As List(Of JBSODetail)
Dim SalesOrderList As New List(Of JBSODetail)
Using context = New iTracContext
Dim query = context.JBSODetails.Include("SOHeader").Include("Part").AsQueryable
If Not String.IsNullOrEmpty(PartID) Then query = query.Where(Function(s) s.pid = PartID)
query = query.Where(Function(s) s.status = "Open")
Return query.OrderBy(Function(s) s.promised_date).ToList
End Using
End Function
Public Function CustomerList(ByVal CutoffDate As Date) As List(Of String)
Dim CList As New List(Of String)
Using Connection As New SqlConnection(ConnectionString)
Connection.Open()
Dim sqlString = "select customer from tblSODetails where promiseddate <= '" & CutoffDate.ToShortDateString & "' " &
"group by customer order by customer"
Dim command = New SqlCommand(sqlString, Connection)
Dim dataReader As SqlDataReader = command.ExecuteReader()
While dataReader.Read()
MapDataReader(dataReader, 2)
CList.Add(Customer)
End While
End Using
Return CList
End Function
Public Shared Function OpenList(ByVal CutoffDate As Date, ByVal Customer As String, ByVal ShipVia As String) As List(Of SalesOrder)
Using context = New iTracContext
Dim query = context.SalesOrders.Include("Inventory").Include("Part").AsQueryable
query = query.Where(Function(s) s.PromisedDate <= CutoffDate)
If Not String.IsNullOrEmpty(Customer) Then query = query.Where(Function(s) s.Customer = Customer)
If Not String.IsNullOrEmpty(ShipVia) Then query = query.Where(Function(s) s.ShipVia = ShipVia)
Return query.OrderBy(Function(l) l.PromisedDate).ToList
End Using
End Function
Public ReadOnly Property PartNumber As String
Get
If Part IsNot Nothing Then
Return Part.NormalizedPartNumber
Else
Return Nothing
End If
End Get
End Property
Public ReadOnly Property rtsOk As Integer?
Get
If Inventory IsNot Nothing Then
Return Inventory.rts_ok
Else
Return Nothing
End If
End Get
End Property
Public ReadOnly Property rtsHold As Integer?
Get
If Inventory IsNot Nothing Then
Return Inventory.rts_hold
Else
Return Nothing
End If
End Get
End Property
Public ReadOnly Property rtsRejected As Integer?
Get
If Inventory IsNot Nothing Then
Return Inventory.rts_rejected
Else
Return Nothing
End If
End Get
End Property
Public ReadOnly Property rtsOut As Integer?
Get
If Inventory IsNot Nothing Then
Return Inventory.rts_out
Else
Return Nothing
End If
End Get
End Property
Public ReadOnly Property rtsInReceving As Integer?
Get
If Inventory IsNot Nothing Then
Return Inventory.rts_receiving
Else
Return Nothing
End If
End Get
End Property
Public ReadOnly Property rtsInShipping As Integer?
Get
If Inventory IsNot Nothing Then
Return Inventory.rts_in_shipping
Else
Return Nothing
End If
End Get
End Property
Public ReadOnly Property rtsIssued As Integer?
Get
If Inventory IsNot Nothing Then
Return Inventory.rts_issued
Else
Return Nothing
End If
End Get
End Property
End Class
答案 0 :(得分：0)
此行引发异常：
Private Shared ConnectionString As String = BrowserUtilities.Settings.ConnectionString
表达式BrowserUtilities.Settings.ConnectionString中的某些事件引发异常。目前尚不清楚，但我会说NullReferenceException是最有可能的候选人。也许BrowserUtilities.Settings是Nothing。这只是猜测。您必须对其进行调试才能找到答案。
当Shared（在C＃中为static）字段（例如您代码中的ConnectionString）具有初始化表达式时，该初始化发生在称为“类型初始值设定项”的特殊方法中。类型中Shared字段的所有初始化表达式都被分组到类型初始化器中，并在首次使用该类型之前执行 * 。
* 为便于说明，这是一个略微的简化。
第一次调用SalesOrdersByBody_JB函数时，它首先必须初始化类型，这意味着运行类型初始值设定项来初始化ConnectionString。看起来SalesOrdersByBody_JB引发了异常，但在此之前确实确实发生了轻微。