将过滤器设置为OpenFileDialog以允许典型的图像格式？

Question

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？

这是我到目前为止所拥有的:

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. :)
    }             
}

请注意,过滤器设置为.txt文件.我可以改为PNG,但其他类型呢？

Answer 1

从文档中,您需要的过滤器语法如下:

Office Files|*.doc;*.xls;*.ppt

即用分号分隔多个扩展名 - 因此,Image Files|*.jpg;*.jpeg;*.png;....

Answer 2

如果您浏览图像文件,请遵循此模式:

dialog.Filter =  "Image files (*.jpg, *.jpeg, *.jpe, *.jfif, *.png) | *.jpg; *.jpeg; *.jpe; *.jfif; *.png";

Answer 3

这是ImageCodecInfo建议的一个例子(在VB中):

   Imports System.Drawing.Imaging
        ...            

        Dim ofd as new OpenFileDialog()
        ofd.Filter = ""
        Dim codecs As ImageCodecInfo() = ImageCodecInfo.GetImageEncoders()
        Dim sep As String = String.Empty
        For Each c As ImageCodecInfo In codecs
            Dim codecName As String = c.CodecName.Substring(8).Replace("Codec", "Files").Trim()
            ofd.Filter = String.Format("{0}{1}{2} ({3})|{3}", ofd.Filter, sep, codecName, c.FilenameExtension)
            sep = "|"
        Next
        ofd.Filter = String.Format("{0}{1}{2} ({3})|{3}", ofd.Filter, sep, "All Files", "*.*")

它看起来像这样:

Answer 4

C#中的完整解决方案在这里:

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  
    }
} 

Answer 5

要过滤图像文件,请使用此代码示例.

//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
   ....
}

Answer 6

我最喜欢Tom Faust的答案.这是他的解决方案的C#版本,但稍微简化了一些事情.

var codecs = ImageCodecInfo.GetImageEncoders(); 
var codecFilter = "Image Files|"; 
foreach (var codec in codecs) 
{
    codecFilter += codec.FilenameExtension + ";"; 
} 
dialog.Filter = codecFilter;

Answer 7

对于图像,您可以从GDI(System.Drawing)获取可用的编解码器,并通过一些工作来构建您的列表.这将是最灵活的方式.

ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

Answer 8

只是使用string.Join和LINQ的一个necrocomment.

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()));

Answer 9

写出您的应用程序所需的类型。（参考FileDialog.Filter）。以下是所有最常见的图像格式。

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";
}

使用示例

设置FilterIndex = 2为预选“所有图片”。除非有充分的理由，否则不要设置。openFileDialog.InitialDirectory

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;
    // ...
}