c# - 在 vb.net 中将一张图片更改为另一张 onclick

Question

假设我有一个加载了图片的普通图片框，当用户点击它时我如何更改其中的图片？

示例:一本书的剪贴画变为海洋的剪贴画。

Answer 1

将图像保存在列表中，并通过指定列表中的索引来更改 PictureBox 的图像:

带有 PictureBox 的简单示例:

Public Class Form1
  Private _Images As New List(Of Image)
  Private _ImageIndex As Integer

  Public Sub New()
    InitializeComponent()

    For i As Integer = 1 To 3
      Dim bmp As New Bitmap(32, 32)
      Using g As Graphics = Graphics.FromImage(bmp)
        Select Case i
          Case 1 : g.Clear(Color.Blue)
          Case 2 : g.Clear(Color.Red)
          Case 3 : g.Clear(Color.Green)
        End Select
      End Using
      _Images.Add(bmp)
    Next

  End Sub

  Private Sub PictureBox1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles PictureBox1.Click
    If _Images.Count > 0 Then
      PictureBox1.Image = _Images(_ImageIndex)
      _ImageIndex += 1
      If _ImageIndex > _Images.Count - 1 Then
        _ImageIndex = 0
      End If
    End If
  End Sub
End Class