Vb.net 如何在vb中保存图片框（绘画程序）中的内容

我正在用microsoft visual basic 2010创建一个basic paint程序，并使用一个图片框作为画布，我想知道如何将该图片框中的内容以jpeg、pdf或其他格式保存到您的计算机中。首先，您需要将其保存为.bmp，然后转换为所需格式

这应该行得通

Imports System.Drawing.Imaging

Private Sub btnSavePictureBox1_Click(sender As System.Object, e As System.EventArgs) Handles btnSavePictureBox1.Click
    Dim WhateverSavePath As String = "C:\WhateverSavePath\"
    Dim WhateverImageName As String = "WhateverImageName.png"
    Dim bm As Bitmap = New Bitmap(PictureBox1.ClientSize.Width, PictureBox1.ClientSize.Height)
    PictureBox1.DrawToBitmap(bm, PictureBox1.ClientRectangle)
    Try
        If My.Computer.FileSystem.FileExists(WhateverSavePath & WhateverImageName) Then
            Dim overwrite As Integer
            overwrite = MessageBox.Show("File exist." & vbCrLf & vbCrLf & WhateverSavePath & WhateverImageName & vbCrLf & vbCrLf & "Do you want to overwrite the existing file?", "Overwrite file?", MessageBoxButtons.YesNo, MessageBoxIcon.Question)

            If overwrite = vbYes Then
                FileIO.FileSystem.DeleteFile(WhateverSavePath & WhateverImageName)
                bm.Save(WhateverSavePath & WhateverImageName, ImageFormat.Png)
                MessageBox.Show("Image Saved" & vbCrLf & vbCrLf & WhateverSavePath & WhateverImageName, "Information", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
            ElseIf overwrite = vbNo Then
                Exit Sub
            End If

        Else
            bm.Save(WhateverSavePath & WhateverImageName, ImageFormat.Png)
            MessageBox.Show("Image Saved" & vbCrLf & vbCrLf & WhateverSavePath & WhateverImageName, "Information", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
        End If
        bm.Dispose()
    Catch ex As Exception
        MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try
End Sub

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在按钮单击事件中使用SaveFileDialog

Dim SFD As New SaveFileDialog
SFD.Filter = "BMP Images|*.bmp|JPG Images|*.jpg|PNG Images|*.png|GIF Images|*.gif"

If SFD.ShowDialog() = DialogResult.OK Then
    PictureBox1.Image.Save(SaveFileDialog1.FileName)
End If

---

注意：1）如果他不希望文件名始终相同，该怎么办？2） 如果他想指定一个自定义路径怎么办？3） 对于

图像

也有一个

.Save

属性。将其制作成位图会浪费内存。1和2很容易理解。这只是一个例子。3我认为这是因为它是一个画布，需要将其转换为位图，然后保存。它们很容易成为一个

SaveFileDialog

：）