imageLocation不会立即设置图片框的图像 [英] imageLocation does not set image of a picture box immediately

问题描述

Picturebox1.ImageLocation = Application.StartupPath  + "\\targetImage.jpg";
            sm = new SecurityManagement(Picturebox1.Image );

上面的代码，在执行第二行时收到空引用错误.
请建议我如何解决该问题.
谢谢！

Hi,
above, I receive the error of null reference while executing the second line.
Please suggest me how can I resolve the issue.
Thank You!

推荐答案

我认为设置ImageLocation属性只是分配路径，因此图像尚未加载到Picturebox1.Image属性中.请尝试以下操作:

I think setting the ImageLocation property just assigns the path, so the image is not loaded into the Picturebox1.Image property yet. Try the following:

Picturebox1.Load( Application.StartupPath  + "\\targetImage.jpg");
            sm = new SecurityManagement(Picturebox1.Image );

这将设置ImageLocation并导致图像显示，并将其加载到PictureBox1.Image属性中.

修改:

基于有关该问题的新规范，以下代码应能完成您要寻找的内容:

This will set the ImageLocation and cause the image to display, which will load it into the PictureBox1.Image property.

Modification:

Based on the new specifications regarding the problem, the following code should accomplish what you are looking for:

Bitmap bitmap;

private void button1_Click(object sender, EventArgs e)
{
    using ( FileStream tempbmp = new FileStream ( @"targetImage.jpg", FileMode.Open ) )
    {
        bitmap = ( Bitmap )Bitmap.FromStream ( tempbmp );
    }

    System.IO.File.Delete ( @"targetImage.jpg" );
}

您可以尝试使用 ^ ]，最好是(而不是Image.FromFile()).

You could try setting the Image property directly, using Image.FromStream()[^], preferably (rather than Image.FromFile()).

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