如果未发布，但使用azure storage live，则提取文件图标可以正常工作。
当我发布我的项目时，（仍然使用相同的存储，azure网站免费/共享），我无法提取文件图标，（500内部服务器错误）。
上传图标
Icon fileIcon = FileIconLoader.GetFileIcon(fileextension);
CloudBlobContainer blobIconContainer = CloudStorageServices.GetCloudBlobIconContainer();
CloudBlockBlob blockBlob = blobIconContainer.GetBlockBlobReference(blobname);
Bitmap pngIcon = fileIcon.ToBitmap();
MemoryStream ms = new MemoryStream();
pngIcon.Save(ms, ImageFormat.Png);
ms.Position = 0;
blockBlob.UploadFromStream(ms);
//检索图标功能
public static class FileIconLoader
{
private const uint SHGFI_ICON = 0x100;
private const uint SHGFI_LARGEICON = 0x0;
private const uint SHGFI_SMALLICON = 0x1;
private const uint SHGFI_USEFILEATTRIBUTES = 0x10;
private const uint FILE_ATTRIBUTE_NORMAL = 0x80;
[DllImport("shell32.dll")]
private static extern IntPtr SHGetFileInfo(string pszPath,
uint dwFileAttributes,
ref SHFILEINFO psfi,
uint cbSizeFileInfo,
uint uFlags);
public static Icon GetFileIcon(string fileExtension)
{
fileExtension = "*" + fileExtension; //om inte fil finns
SHFILEINFO shinfo = new SHFILEINFO();
IntPtr hImg;
hImg = SHGetFileInfo(fileExtension, FILE_ATTRIBUTE_NORMAL, ref shinfo,
(uint)Marshal.SizeOf(shinfo),
SHGFI_ICON |
SHGFI_LARGEICON |
SHGFI_USEFILEATTRIBUTES);
try
{
return Icon.FromHandle(shinfo.hIcon);
}
catch
{
return null;
}
}
}
浏览器控制台窗口中的错误消息：
POST mywebsite.azurewebsites.net/Folder/Upload 500（内部服务器错误）
为什么它没有发布？
非常感谢您的帮助，谢谢！
答案 0 :(得分：1)
这段代码是我们为此目的写回来的。它的作用是从注册表中找到所有已注册的文件类型（GetFileType方法），然后提取所有这些文件的图标并将其保存为PNG格式（GetIconImageFromFilename）。希望这会有所帮助。
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
namespace RegistryFileExtensionWithIcon
{
public class RegistryFileName
{
public static Dictionary<string, Bitmap> FileIconAssociation = new Dictionary<string, Bitmap>();
public static List<string> GetFileType()
{
List<string> allFiles = new List<string>();
try
{
// Create a registry key object to represent the HKEY_CLASSES_ROOT registry section
RegistryKey rkRoot = Registry.ClassesRoot;
//Gets all sub keys' names.
string[] keyNames = rkRoot.GetSubKeyNames();
//Hashtable iconsInfo = new Hashtable();
//Find the file icon.
foreach (string keyName in keyNames)
{
if (String.IsNullOrEmpty(keyName))
continue;
int indexOfPoint = keyName.IndexOf(".");
//If this key is not a file exttension(eg, .zip), skip it.
if (indexOfPoint != 0)
continue;
RegistryKey rkFileType = rkRoot.OpenSubKey(keyName);
if (rkFileType == null)
continue;
allFiles.Add(keyName);
rkFileType.Close();
}
rkRoot.Close();
return allFiles;
}
catch (Exception exc)
{
throw exc;
}
}
public static void GetIconImageFromFilename(List<string> FileNames)
{
Bitmap bmpImage = null;
string FileExtension = string.Empty;
foreach (var file in FileNames)
{
int IndexOfLastDot = file.LastIndexOf(".");
if (IndexOfLastDot >= 0)
{
FileExtension = file.Substring(IndexOfLastDot + 1).ToLower();
}
if (!FileIconAssociation.TryGetValue(FileExtension, out bmpImage))
{
IntPtr sImgSmall;
SHFILEINFO shinfoForSmallIcon = new SHFILEINFO();
sImgSmall = Win32.SHGetFileInfo(file, 0, ref shinfoForSmallIcon, (uint)Marshal.SizeOf(shinfoForSmallIcon),Win32.SHGFI_USEFILEATTRIBUTES | Win32.SHGFI_ICON | Win32.SHGFI_SMALLICON );
System.Drawing.Icon smallIcon = (System.Drawing.Icon)(System.Drawing.Icon.FromHandle(shinfoForSmallIcon.hIcon).Clone());
Win32.DestroyIcon(shinfoForSmallIcon.hIcon);
System.Drawing.Bitmap bmp1 = smallIcon.ToBitmap();
string location = System.IO.Path.GetDirectoryName(new Uri(System.Reflection.Assembly.GetExecutingAssembly().CodeBase).LocalPath) + "\\DownloadIcons\\16x16\\";
Directory.CreateDirectory(location);
string completeFilePath1 = string.Format("{0}{1}.png", location, FileExtension);
bmp1.Save(completeFilePath1, ImageFormat.Png);
IntPtr hImgLarge;
SHFILEINFO shinfoForLargeIcon = new SHFILEINFO();
hImgLarge = Win32.SHGetFileInfo(file, 0, ref shinfoForLargeIcon, (uint)Marshal.SizeOf(shinfoForLargeIcon),
Win32.SHGFI_USEFILEATTRIBUTES | Win32.SHGFI_ICON | Win32.SHGFI_LARGEICON );
System.Drawing.Icon largeIcon = (System.Drawing.Icon)(System.Drawing.Icon.FromHandle(shinfoForLargeIcon.hIcon).Clone());
Win32.DestroyIcon(shinfoForLargeIcon.hIcon);
System.Drawing.Bitmap bmp2 = largeIcon.ToBitmap();
string filePath = System.IO.Path.GetDirectoryName(new Uri(System.Reflection.Assembly.GetExecutingAssembly().CodeBase).LocalPath) + "\\DownloadIcons\\32x32\\";
Directory.CreateDirectory(filePath);
string completeFilePath2 = string.Format("{0}{1}.png", filePath, FileExtension);
bmp2.Save(completeFilePath2, ImageFormat.Png);
}
}
}
public struct SHFILEINFO
{
public IntPtr hIcon;
public IntPtr iIcon;
public uint dwAttributes;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string szDisplayName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
public string szTypeName;
};
}
public class Win32
{
public const uint SHGFI_ICON = 0x000000100;
public const uint SHGFI_DISPLAYNAME = 0x000000200;
public const uint SHGFI_TYPENAME = 0x000000400;
public const uint SHGFI_ATTRIBUTES = 0x000000800;
public const uint SHGFI_ICONLOCATION = 0x000001000;
public const uint SHGFI_EXETYPE = 0x000002000;
public const uint SHGFI_SYSICONINDEX = 0x000004000;
public const uint SHGFI_LINKOVERLAY = 0x000000000;// 0x000008000;
public const uint SHGFI_SELECTED = 0x000010000;
public const uint SHGFI_ATTR_SPECIFIED = 0x000020000;
public const uint SHGFI_LARGEICON = 0x000000000;
public const uint SHGFI_SMALLICON = 0x000000001;
public const uint SHGFI_OPENICON = 0x000000002;
public const uint SHGFI_SHELLICONSIZE = 0x000000004;
public const uint SHGFI_PIDL = 0x000000008;
public const uint SHGFI_USEFILEATTRIBUTES = 0x000000010;
public const uint SHGFI_ADDOVERLAYS = 0x000000020;
public const uint SHGFI_OVERLAYINDEX = 0x000000040;
// public const uint SHGFI_ICON = 0x100;
// public const uint SHGFI_LARGEICON = 0x0; // 'Large icon
// public const uint SHGFI_SMALLICON = 0x1; // 'Small icon
public const uint ILD_TRANSPARENT = 0x1;
public const int GWL_STYLE = (-16);
public const UInt32 SWP_FRAMECHANGED = 0x0020;
public const UInt32 SWP_NOSIZE = 0x0001;
public const UInt32 SWP_NOMOVE = 0x0002;
public const int WS_SYSMENU = 0x00080000;
[DllImport("user32.dll", SetLastError = true)]
public static extern int GetWindowLong(IntPtr hWnd, int nIndex);
public static IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
{
if (IntPtr.Size == 8)
return SetWindowLongPtr64(hWnd, nIndex, dwNewLong);
return new IntPtr(SetWindowLong32(hWnd, nIndex, dwNewLong.ToInt32()));
}
[DllImport("shell32.dll")]
public static extern IntPtr SHGetFileInfo(string pszPath,
uint dwFileAttributes,
ref RegistryFileName.SHFILEINFO psfi,
uint cbSizeFileInfo,
uint uFlags);
[DllImport("user32")]
public static extern int DestroyIcon(IntPtr hIcon);
[DllImport("user32.dll", EntryPoint = "SetWindowLong")]
private static extern int SetWindowLong32(IntPtr hWnd, int nIndex, int dwNewLong);
[DllImport("user32.dll", EntryPoint = "SetWindowLongPtr")]
private static extern IntPtr SetWindowLongPtr64(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
[DllImport("user32.dll", SetLastError = true)]
public static extern int SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
[DllImport("shell32.dll")]
public static extern int SHGetKnownFolderPath([MarshalAs(UnmanagedType.LPStruct)] Guid rfid, uint dwFlags, IntPtr hToken, out IntPtr pszPath);
}
}