交互优化, 断网更新弹框删除,图标显示优化,待办任务bug修复

Util/NativeMethods.cs

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+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace GeekDesk.Util
+{
+    /// <summary>
+    /// 保存文件信息的结构体
+    /// </summary>
+    /// 
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+    struct SHFILEINFO
+    {
+        public IntPtr hIcon;
+        public int iIcon;
+        public uint dwAttributes;
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
+        public string szDisplayName;
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
+        public string szTypeName;
+    }
+
+    class NativeMethods
+    {
+
+        [DllImport("Shell32.dll", EntryPoint = "SHGetFileInfo", SetLastError = true, CharSet = CharSet.Auto)]
+        public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbFileInfo, uint uFlags);
+
+        [DllImport("User32.dll", EntryPoint = "DestroyIcon")]
+        public static extern int DestroyIcon(IntPtr hIcon);
+
+        #region API 参数的常量定义
+
+        public const uint SHGFI_ICON = 0x100;
+        public const uint SHGFI_LARGEICON = 0x0; //大图标 32×32
+        public const uint SHGFI_SMALLICON = 0x1; //小图标 16×16
+        public const uint SHGFI_USEFILEATTRIBUTES = 0x10;
+
+        #endregion
+
+        /// <summary>
+        /// 获取文件类型的关联图标
+        /// </summary>
+        /// <param name="fileName">文件类型的扩展名或文件的绝对路径</param>
+        /// <param name="isLargeIcon">是否返回大图标</param>
+        /// <returns>获取到的图标</returns>
+        static Icon GetIcon(string fileName, bool isLargeIcon)
+        {
+            SHFILEINFO shfi = new SHFILEINFO();
+            IntPtr hI;
+
+            if (isLargeIcon)
+                hI = NativeMethods.SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), NativeMethods.SHGFI_ICON | NativeMethods.SHGFI_USEFILEATTRIBUTES | NativeMethods.SHGFI_LARGEICON);
+            else
+                hI = NativeMethods.SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), NativeMethods.SHGFI_ICON | NativeMethods.SHGFI_USEFILEATTRIBUTES | NativeMethods.SHGFI_SMALLICON);
+
+            Icon icon = Icon.FromHandle(shfi.hIcon).Clone() as Icon;
+
+            NativeMethods.DestroyIcon(shfi.hIcon); //释放资源
+            return icon;
+        }
+
+    }
+    
+
+
+}