Question

我有这个代码，它使用文件夹中的文件更新SQL数据库，并在更新后删除它们，但只要在文件夹中找到空白文件，它就会给我一个异常。它给出了错误＆＃34;对象引用未设置为对象的实例＆＃34; 。我真正想要做的是在处理每个文件之前我需要检查每个文件是否为空白然后删除它否则处理它。这是代码：

非常感谢任何帮助。

Dim dirinfo5 As DirectoryInfo
        Dim allFiles5() As FileInfo
        dirinfo5 = New DirectoryInfo("E:\UPDATE\")
        allFiles5 = dirinfo5.GetFiles("*.csv")
        Thread.Sleep(1000)
        If allFiles5.Length <> 0 Then
            Try
                For Each fl5 As FileInfo In allFiles5
                    'MsgBox(fl.FullName.ToString())
                    Dim con As SqlConnection = New SqlConnection(SQL_con2)
                    Dim sr As StreamReader = New StreamReader(fl5.FullName)
                    Dim line As String = sr.ReadLine
                    Dim value() As String = line.Split(Microsoft.VisualBasic.ChrW(44))
                    Dim dt As DataTable = New DataTable
                    Dim row As DataRow
                    For Each dc As String In value
                        dt.Columns.Add(New DataColumn(dc))
                    Next

                    While Not sr.EndOfStream
                        value = sr.ReadLine.Split(Microsoft.VisualBasic.ChrW(44))
                        If (value.Length = dt.Columns.Count) Then
                            row = dt.NewRow
                            row.ItemArray = value
                            dt.Rows.Add(row)
                        End If

                    End While
                    Dim bc As SqlBulkCopy = New SqlBulkCopy(con.ConnectionString, SqlBulkCopyOptions.TableLock)
                    bc.DestinationTableName = "[DB].[dbo].[LData]"
                    bc.BatchSize = dt.Rows.Count
                    con.Open()
                    bc.WriteToServer(dt)
                    bc.Close()
                    con.Close()
                    sr.Close()
                    System.IO.File.Delete(fl5.FullName)
                    sr.Dispose()
                Next
            Catch ex As Exception
                MsgBox(ex.Message)
            End Try
        End If

Answer 1

您可以使用File.ReadAllText方法：它返回String，以便您查看。Length。

如何检查文件夹中的空文件？

1 个答案: