C# 图像源绑定到本地存储中的文件
在Windows Metro应用程序(C#)中,我使用ValueConverter传递图像Uri,如下所示:C# 图像源绑定到本地存储中的文件,c#,wpf,image,xaml,windows-phone-8,C#,Wpf,Image,Xaml,Windows Phone 8,在Windows Metro应用程序(C#)中,我使用ValueConverter传递图像Uri,如下所示: public class ProfileImage : IValueConverter { public Object Convert(Object value, Type targetType, Object parameter, String language) { if (value == null) { return "Comm
public class ProfileImage : IValueConverter {
public Object Convert(Object value, Type targetType, Object parameter, String language) {
if (value == null) {
return "Common/images_profile/user.png";
}
return "ms-appdata:///local/" + (String)value;
}
public Object ConvertBack(Object value, Type targetType, Object parameter, String language) {
return value;
}
}
XAML:
用于将图像写入本地存储
如果value
中没有任何内容,则Common/images\u profile/user.png
中的图像将正确显示。这一个在包中,而不是在本地文件夹中
我需要知道我必须使用哪种格式作为返回参数才能显示图像。这里肯定缺少什么。。为什么不使用StorageFile.Path而不是返回“return”ms-appdata:///local/“+(字符串)值;”
意识到这是另一回事。您仍然可以使用独立存储,Silverlight Uri在这里肯定缺少某些内容。。为什么不使用StorageFile.Path而不是返回“return”ms-appdata:///local/“+(字符串)值;” 意识到这是另一回事。您仍然可以使用独立存储和Silverlight Uri我认为ms appdata:///的URL方案并不适用于任何地方 我使用此转换器绑定来自独立存储的图像:
public class PathToImageConverter : IValueConverter
{
private static IsolatedStorageFile isoStorage = IsolatedStorageFile.GetUserStoreForApplication();
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string path = value as string;
if (string.IsNullOrEmpty(path))
return null;
if ((path.Length > 9) && (path.ToLower().Substring(0, 9).Equals("isostore:")))
{
using (var sourceFile = isoStorage.OpenFile(path.Substring(9), FileMode.Open, FileAccess.Read))
{
BitmapImage image = new BitmapImage();
image.SetSource(sourceFile);
return image;
}
}
else
{
BitmapImage image = new BitmapImage(new Uri(path));
return image;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
对于绑定,必须在url中使用isostore:前缀。我认为url方案ms-appdata:///并不适用于任何地方
我使用此转换器绑定来自独立存储的图像:
public class PathToImageConverter : IValueConverter
{
private static IsolatedStorageFile isoStorage = IsolatedStorageFile.GetUserStoreForApplication();
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string path = value as string;
if (string.IsNullOrEmpty(path))
return null;
if ((path.Length > 9) && (path.ToLower().Substring(0, 9).Equals("isostore:")))
{
using (var sourceFile = isoStorage.OpenFile(path.Substring(9), FileMode.Open, FileAccess.Read))
{
BitmapImage image = new BitmapImage();
image.SetSource(sourceFile);
return image;
}
}
else
{
BitmapImage image = new BitmapImage(new Uri(path));
return image;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
对于绑定,必须在url中使用isostore:前缀
public class PathToImageConverter : IValueConverter
{
private static IsolatedStorageFile isoStorage = IsolatedStorageFile.GetUserStoreForApplication();
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string path = value as string;
if (string.IsNullOrEmpty(path))
return null;
if ((path.Length > 9) && (path.ToLower().Substring(0, 9).Equals("isostore:")))
{
using (var sourceFile = isoStorage.OpenFile(path.Substring(9), FileMode.Open, FileAccess.Read))
{
BitmapImage image = new BitmapImage();
image.SetSource(sourceFile);
return image;
}
}
else
{
BitmapImage image = new BitmapImage(new Uri(path));
return image;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}