将过滤器设置为OpenFileDialog以允许典型的图像格式？
将过滤器设置为OpenFileDialog以允许典型的图像格式？
提问于 2010-01-15 10:27:19
我有这个代码，我怎么能让它接受所有典型的图像格式呢？PNG、JPEG、JPG、GIF？
这是我到目前为止所知道的：
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，筛选器设置为.txt文件。I可以将更改为PNG，但其他类型怎么办？
回答 12
Stack Overflow用户
回答已采纳
发布于 2010-01-15 10:37:07
在the docs中，您需要的筛选器语法如下：
Office Files|*.doc;*.xls;*.ppt即用分号分隔多个扩展名--因此，Image Files|*.jpg;*.jpeg;*.png;...。
Stack Overflow用户
发布于 2011-12-16 07:11:58
以下是ImageCodecInfo建议的示例(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：
Stack Overflow用户
发布于 2012-02-07 20:50:35
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
}
} 页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/2069048
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