在VBA DAO 记录集中检查 null 值时,可以使用 IsNull 函数。IsNull 函数用于检查字段是否包含 null 值。以下是一个示例代码: 代码语言:vba 复制 Sub CheckNullValue() Dim db As DAO.Database Dim rs As DAO.Recordset Dim fieldName As String Dim fieldValue As
对于str未赋值 判定是True另外单元格 str=“” 就是空举例Dim MyVar, MyCheckMyCheck = IsNull(MyVar...
Public FunctionCOUNTDISTINCTcol(ByRef rngToCheck As Range)As Variant Dim colDistinct As Collection Dim varValues As Variant Dim varValue As Variant Dim lngCount As Long Dim lngRow As Long Dim lngCol As Long On Error GoTo ErrorHandler varValues=rngToCheck.Value '如果rngToCheck多于1个单元格 '...
If Cells(Target.Row, Target.Column) <> "" Then Beep Cells(Target.Row, 1).Offset(0, 0).Select 'MsgBox Cells(Target.Row, Target.Column).Address & " cannot be selected and edited as it is a read-only cell", _ 'vbInformation, "Tool" End If End If End Sub6.check是不是文件夹或者...
有些情况下，您可能希望计算结果为 True 的表达式，如 If Var = Null 和 If Var <> Null 始终为 False 。这是因为包含 Null 的任何表达式本⾝为 Null， 因此 为 False。 ⽰例： 此⽰例使⽤ IsNull 函数确定变量是否包含 Null。Dim MyVar, MyCheckMyCheck = IsNull(MyVar) ' Returns False.MyVar...
如果您卸载 UserForm, 是与 UserForm 或者, 是与 UserForm 上控件的事件过程中 (例如, 您单击 CommandButton 控件), 您可以使用 " 我 " 关键字代替的 UserForm 名称。 将关键字用于卸载 UserForm, " Me " 使用以下代码: Unload Me 如何使用 UserForm 事件 ...
'// Check each window in turnDohLogWindow=FindWindowEx(0&,hLogWindow,vbNullString,vbNullString)'// Check that a window was found If hLogWindow = 0 Then Exit Do '// Get the class name of the windowsData=String$(100,Chr$(0))nLen=GetClassName(hLogWindow,sData,100)Class=Left$(sData...
CheckEntry = Not IsNull(DLookup("IDCloud", "TblCloud", strCriteria)) End Function In ether case to return the result in a message box the function would be called like this: MsgBox CheckEntry("000000001") For an example of the use of the EXISTS predicate you might like to take...
The type is a valid type, but the object library or type library in which it is defined isn't registered in Visual Basic. Display theReferencesdialog box, and then select the appropriate object library or type library. For example, if you don't check theData Access Objectin theReferencesdi...
every multiple of 10.Check = (MsgBox("Keep going?", vbYesNo) = vbYes)' Stop when user click's on NoIfNotCheckThenExitDo' Exit inner loop.EndIfLoopTotal = Total + Counter' Exit Do Lands here.Counter =0LoopUntilCheck =False' Exit outer loop immediately.MsgBox"Counted to: "& Total...