我有这个代码，我怎么能让它接受所有典型的图像格式?Png, jpeg, jpg, gif ?
以下是我目前所了解到的:
public void EncryptFile()
{
OpenFileDialog dialog = new OpenFileDialog();
dialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
dialog.InitialDirectory = @"C:\";
dialog.Title = "Please select an image file to encrypt.";
if (dialog.ShowDialog() == DialogResult.OK)
{
//Encrypt the selected file. I'll do this later. :)
}
}
注意，过滤器被设置为.txt文件。我可以更改为PNG，但其他类型呢?
当前回答
只是一个关于使用字符串的necrocomment。Join和LINQ。
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
dlgOpenMockImage.Filter = string.Format("{0}| All image files ({1})|{1}|All files|*",
string.Join("|", codecs.Select(codec =>
string.Format("{0} ({1})|{1}", codec.CodecName, codec.FilenameExtension)).ToArray()),
string.Join(";", codecs.Select(codec => codec.FilenameExtension).ToArray()));
其他回答
要过滤图像文件，请使用下面的代码示例。
//Create a new instance of openFileDialog
OpenFileDialog res = new OpenFileDialog();
//Filter
res.Filter = "Image Files|*.jpg;*.jpeg;*.png;*.gif;*.tif;...";
//When the user select the file
if (res.ShowDialog() == DialogResult.OK)
{
//Get the file's path
var filePath = res.FileName;
//Do something
....
}
完整的c#解决方案在这里:
private void btnSelectImage_Click(object sender, RoutedEventArgs e)
{
// Configure open file dialog box
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.Filter = "";
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
string sep = string.Empty;
foreach (var c in codecs)
{
string codecName = c.CodecName.Substring(8).Replace("Codec", "Files").Trim();
dlg.Filter = String.Format("{0}{1}{2} ({3})|{3}", dlg.Filter, sep, codecName, c.FilenameExtension);
sep = "|";
}
dlg.Filter = String.Format("{0}{1}{2} ({3})|{3}", dlg.Filter, sep, "All Files", "*.*");
dlg.DefaultExt = ".png"; // Default file extension
// Show open file dialog box
Nullable<bool> result = dlg.ShowDialog();
// Process open file dialog box results
if (result == true)
{
// Open document
string fileName = dlg.FileName;
// Do something with fileName
}
}
写出应用程序需要的类型。(ref FileDialog.Filter)。以下是最常见的图像格式。
private static string GetImageFilter()
{
return
"All Files (*.*)|*.*" +
"|All Pictures (*.emf;*.wmf;*.jpg;*.jpeg;*.jfif;*.jpe;*.png;*.bmp;*.dib;*.rle;*.gif;*.emz;*.wmz;*.tif;*.tiff;*.svg;*.ico)" +
"|*.emf;*.wmf;*.jpg;*.jpeg;*.jfif;*.jpe;*.png;*.bmp;*.dib;*.rle;*.gif;*.emz;*.wmz;*.tif;*.tiff;*.svg;*.ico" +
"|Windows Enhanced Metafile (*.emf)|*.emf" +
"|Windows Metafile (*.wmf)|*.wmf" +
"|JPEG File Interchange Format (*.jpg;*.jpeg;*.jfif;*.jpe)|*.jpg;*.jpeg;*.jfif;*.jpe" +
"|Portable Network Graphics (*.png)|*.png" +
"|Bitmap Image File (*.bmp;*.dib;*.rle)|*.bmp;*.dib;*.rle" +
"|Compressed Windows Enhanced Metafile (*.emz)|*.emz" +
"|Compressed Windows MetaFile (*.wmz)|*.wmz" +
"|Tag Image File Format (*.tif;*.tiff)|*.tif;*.tiff" +
"|Scalable Vector Graphics (*.svg)|*.svg" +
"|Icon (*.ico)|*.ico";
}
示例使用
设置FilterIndex = 2以预选“所有图片”。不要设置openFileDialog。除非你有一个很好的理由。
void OpenImageFile()
{
var openFileDialog = new OpenFileDialog
{
Filter = GetImageFilter(),
FilterIndex = 2,
RestoreDirectory = true
};
DialogResult result = openFileDialog.ShowDialog();
// do something with your file
// bool resultOk = (result == System.Windows.Forms.DialogResult.OK);
// string filePath = openFileDialog.FileName;
// ...
}
为了匹配一个由不同类别的文件组成的列表，你可以像这样使用过滤器:
var dlg = new Microsoft.Win32.OpenFileDialog()
{
DefaultExt = ".xlsx",
Filter = "Excel Files (*.xls, *.xlsx)|*.xls;*.xlsx|CSV Files (*.csv)|*.csv"
};
只是一个关于使用字符串的necrocomment。Join和LINQ。
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
dlgOpenMockImage.Filter = string.Format("{0}| All image files ({1})|{1}|All files|*",
string.Join("|", codecs.Select(codec =>
string.Format("{0} ({1})|{1}", codec.CodecName, codec.FilenameExtension)).ToArray()),
string.Join(";", codecs.Select(codec => codec.FilenameExtension).ToArray()));
