需要幫助調用方法

Question

我正在嘗試將圖片上傳到Winform，然后顯示縮略圖。 我嘗試將功能添加到btnUpload_click方法中，但不允許我將PaintEventArgs設置為事件處理程序。 因此，為了解決這個問題，我創建了另一個方法，但是現在需要知道如何調用它。

private void btnUpload_Click(object sender, EventArgs e)
{}

public void getImage(PaintEventArgs ex)
{
    Image.GetThumbnailImageAbort myCallback =
    new Image.GetThumbnailImageAbort(ThumbnailCallback);

    OpenFileDialog open = new OpenFileDialog();
    // image filters
    open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp";
    if (open.ShowDialog() == DialogResult.OK)
    {
        // display image in picture box
        upload = new Bitmap(open.FileName);

        pictureBox1.Image.GetThumbnailImage(114, 108, myCallback, IntPtr.Zero);
        ex.Graphics.DrawImage(upload, 150, 75);
    }
}

謝謝您的幫助

Answer 1

對於Graphics實例，您不需要PaintEventArgs 。 只需更改代碼即可在按鈕單擊內工作：

Image.GetThumbnailImageAbort myCallback =
    new Image.GetThumbnailImageAbort(ThumbnailCallback);

OpenFileDialog open = new OpenFileDialog();

// image filters
open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp";
if (open.ShowDialog() == DialogResult.OK)
{
    // display image in picture box
    upload = new Bitmap(open.FileName);

    pictureBox1.Image.GetThumbnailImage(114, 108, myCallback, IntPtr.Zero);
    this.CreateGraphics().DrawImage(upload, 150, 75);
}