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应用程序，每 30 秒它会将一张图片保存到临时目录，但我需要使用不同的名称保存每张照片，例如 MDAL1Image1.jpg 、 MDAL1Image2.jpg 等，但我收到此错误

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

这是我得到错误的那一行

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，它试图对作为双精度数的nametosave 和作为字符串的"MDAL1Image" 执行二元运算。它无法将字符串解释为有效的双精度值。