vb.net - 从字符串 "C:\Mediamemebuilderpro\MDAL1Imag"到类型 'Double' 的转换无效。”

Question

我已经启动了一个新的应用程序，每 30 秒它会将一张照片保存到临时目录，但我需要用不同的名称保存每张照片，如 MDAL1Image1.jpg 、 MDAL1Image2.jpg 等，但我收到此错误

{"Conversion from string "C:\Mediamemebuilderpro\MDAL1Imag" to type 'Double' is not valid."}

这是我得到错误的行

PB1.Save("C:\Mediamemebuilderpro\" + "MDAL1Image" + nametosave + ".jpg", System.Drawing.Imaging.ImageFormat.Bmp)
    timetosavetemp = 0

这是我得到错误的代码

Private Sub Timer2_Tick(sender As Object, e As EventArgs) Handles Timer2.Tick
    timetosavetemp = timetosavetemp + 1
    If timetosavetemp >= 30 Then
        Dim nametosave = 1
        nametosave = nametosave + 1
        Dim PB1 As New Bitmap(PictureBox1.Image)

        PB1.Save("C:\Mediamemebuilderpro\" + "MDAL1Image" + nametosave + ".jpg", System.Drawing.Imaging.ImageFormat.Bmp)
        timetosavetemp = 0

    End If
End Sub

Answer 1

使用 String.Format 构造文件名，根据需要更改段。

Dim filename As String = "MDAL1Image" 'Change as needed
Dim path As String = String.Format("C:\Mediamemebuilderpro\{0}{1}.jpg", filename, nametosave)
PB1.Save(path, System.Drawing.Imaging.ImageFormat.Bmp)

当使用 ... "MDAL1Image"+ nametosave + ... 时，它试图对 nametosave 执行二元运算，它是一个 double ，而 “MDAL1Image”，这是一个字符串。它无法将字符串解释为有效的 double 值。