我正在做一个生成Microsoft Word文档的项目。我的代码如下。我得异常为“System.InvalidCastException：无法将类型'System .__ ComObject'的COM对象强制转换为类类型'System.String'。表示COM组件的类型的实例不能转换为不代表COM组件的类型;但是只要底层COM组件支持对接口的IID的QueryInterface调用，它们就可以转换为接口。 at reportexample.Form1.GetNewResult（Field wField，Document WordDoc）在F：\ reportexample \ reportexample \ Form1.vb：第114行“
Private Function GetNewResult(wField As Word.Field, WordDoc As Word.Document) As String
Dim StopPos As Long
Dim Variable As String = ""
Dim UsedVariable As String
Dim VariableValue As String
Dim wRange As Word.Range
Try
Debug.Print(wField.Code)
' These three lines strip down the field code to find
' out it's name
StopPos = InStrRev(wField.Code, "\*")
Variable = Microsoft.VisualBasic.Left(wField.Code, StopPos - 3)
Variable = Microsoft.VisualBasic.Right(Variable, Len(Variable) - 14)
Catch ex As Exception
TextBox1.Text = ex.ToString
End Try
' Check this field hasn't already appeared in this
' document.
If CheckUsedVariable(Variable) Then
VariableValue = GetVariableValue(Variable)
Else
Select Case UCase(Variable)
' I don't simply want to insert a string -
' I wish to insert a table at the Product Field.
Case "PRODUCT"
' Get the range (location) of the product field
wRange = wField.Code
' Delete the field, as any text will be inserted into the
' {} of the existing field.
wField.Delete()
' Enter our table information including headers.
' Ideally, I would get this data from an ADO recordset
' using GetString().
With wRange
.Text = "PRODUCT" & vbTab & "CTSBATCHNO" & vbTab & "SUPP REF" & vbTab & "PACKNO" & vbTab & "STORAGE" & vbTab & "QTY UNITS" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3" & vbCrLf & _
"989797897" & vbTab & "hjhkhk" & vbTab & "kjhkjhkh" & vbTab & "kjhkjh" & vbTab & "Frozen" & vbTab & "3"
.FormattedText.Font.Name = "Arial"
.FormattedText.Font.Size = "8"
' Once the data is there, we can convert it to a table
' structure and format it to look pretty!
.ConvertToTable(vbTab, , , , WdTableFormat.wdTableFormatColorful2)
End With
' Send back blank string as field does not exist anymore
VariableValue = ""
Case Else
' Get the value of the field from the user
VariableValue = InputBox("Enter value for: " & Variable, "Value not recognised for Despatch Note!")
AddNewVariable(Variable, VariableValue)
End Select
End If
GetNewResult = VariableValue
End Function
答案 0 :(得分：0)
Word.Field.Code
是Range对象，无法转换为字符串。
尝试wField.Code.Text