Question

private void Add_Files_Click(object sender, RoutedEventArgs e)
  {
    OpenFileDialog openFileDialog = new OpenFileDialog();
    openFileDialog.Multiselect = true;
    openFileDialog.Filter = "All Images Files (*.png;*.jpeg;*.gif;*.jpg;*.bmp;*.tiff;*.tif)|*.png;*.jpeg;*.gif;*.jpg;*.bmp;*.tiff;*.tif";
    openFileDialog.Filter = "PNG Portable Network Graphics (*.png)|" + "*.png";
    openFileDialog.Filter = "JPEG File Interchange Format (*.jpg *.jpeg *jfif)|" + "*.jpg;*.jpeg;*.jfif";
    openFileDialog.Filter = "BMP Windows Bitmap (*.bmp)|" + "*.bmp";
    openFileDialog.Filter = "TIF Tagged Imaged File Format (*.tif *.tiff)|" + "*.tif;*.tiff";
    openFileDialog.Filter = "GIF Graphics Interchange Format (*.gif)|" + "*.gif";
  }

这样当我单击按钮时，默认且唯一的选项是GIF文件类型。我无法将其更改为任何其他文件类型。

我希望默认的第一个选项是All Images File，然后我就可以为每种图像格式进行更改。

Answer 1

使用|字符加入所有字符串并分配

dialog.Filter = "All Images Files (*.png;*.jpeg;*.gif;*.jpg;*.bmp;*.tiff;*.tif)|*.png;*.jpeg;*.gif;*.jpg;*.bmp;*.tiff;*.tif" +
            "|PNG Portable Network Graphics (*.png)|*.png" +
            "|JPEG File Interchange Format (*.jpg *.jpeg *jfif)|*.jpg;*.jpeg;*.jfif" +
            "|BMP Windows Bitmap (*.bmp)|*.bmp" +
            "|TIF Tagged Imaged File Format (*.tif *.tiff)|*.tif;*.tiff" +
            "|GIF Graphics Interchange Format (*.gif)|*.gif";

在使用OpenFileDialog时，如何首先过滤所有图像类型？

1 个答案: