在c#中上传图像，在wpf中显示消息框

本文关键字：显示 消息 wpf 图像 | 更新日期: 2023-09-27 18:08:50

我正在制作一个程序，该程序将只上传位图。如果用户试图上传任何其他扩展，它应该弹出一个错误消息。

OpenFileDialog op = new OpenFileDialog();
op.Title = "Open Image";
op.Filter = "bmp files (*.bmp)|*.bmp";
if (op.ShowDialog() == true)
{
    image.Source = new BitmapImage(new Uri(op.FileName));
}
if ( op.ShowDialog() !== FilterEventArgs)
{
    MessageBox.Show ( your path doesn't bmp ); 
}

我如何纠正这段代码，什么是正确的参数放入if语句来显示消息框?

在c#中上传图像，在wpf中显示消息框

 Image image = new Image();
        OpenFileDialog op = new OpenFileDialog();
        op.Title = "Open Image";
        op.Filter = "bmp files (*.bmp)|*.bmp";
        bool bNotBmp = true;
        while (op.ShowDialog() == true && bNotBmp == true)
        {
           FileInfo FileInf = new FileInfo(op.FileName);
           string ImgExtension = FileInf.Extension;
           if (FileInf.Extension.ToString().ToLower() != ".bmp")
           {
               MessageBox.Show("Please upload only bmp file");
           }
           else
           {
               bNotBmp = false;
           }
        }
        MessageBox.Show("Write image or operation cancelled.");

OpenFileDialog op = new OpenFileDialog();
op.Title = "Open Image";
op.Filter = "bmp files (*.bmp)|*.bmp";
var result = op.ShowDialog();
if (result == DialogResult.OK)
{
    if(System.IO.Path.GetExtension(op.FileName).ToLower() == ".bmp"){
        image.Source = new BitmapImage(new Uri(op.FileName));
    }
    else{
        MessageBox.Show ("The file must have a .bmp extension"); 
    }
}
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