C#--圖片上傳（PC端和APP）保存及 跨域上傳說明，

C#--圖片上傳（PC端和APP）保存及 跨域上傳說明，

A-PC端：

1-頁面--multiple是控制單張還是多張圖片上傳

<input id="BusRoute" type="file" class="btn btn-default btn-lg"  multiple />

2-後台獲取圖片文件：

HttpFileCollection pcFileColl = HttpContext.Current.Request.Files;

3-保存示例：

#region 創建目錄
//完整存儲路徑
string completeUrl = "";
//相對等級路徑
string relativeUrl = "";

//string saveTempPath = "~/Resources/Pic";
//string picUploadPath = HttpContext.Current.Server.MapPath(saveTempPath);
//添加根目錄
completeUrl = @"\\10.0.8.52\YuanXinFiles\Office\"; ;
//添加一級目錄
string relativeOneUrl = DateTime.Now.Year.ToString();
completeUrl += "\\" + relativeOneUrl;
relativeUrl += "\\" + relativeOneUrl;
if (!Directory.Exists(completeUrl))
{
    Directory.CreateDirectory(completeUrl);
}
//添加二級目錄
string relativeTwoUrl = DateTime.Now.Month.ToString();
completeUrl += "\\" + relativeTwoUrl;
relativeUrl += "\\" + relativeTwoUrl;
if (!Directory.Exists(completeUrl))
{
    Directory.CreateDirectory(completeUrl);
}
#endregion

//保存
HttpFileCollection picColl = picModel.PcFileColl;
for (var i = 0; i < picColl.Count; i++)
{
    HttpPostedFile file = picColl[i];
    //保存圖片
    //保存至指定目錄
    file.SaveAs(completeUrl + "\\" + fileName);
}

B-APP：

前端頁面長什麼樣不管了，後台拿到的是base64的字符串集合.

1-保存示例：

#region 創建目錄
//完整存儲路徑
string completeUrl = "";
//相對等級路徑
string relativeUrl = "";

//string saveTempPath = "~/Resources/Pic";
//string picUploadPath = HttpContext.Current.Server.MapPath(saveTempPath);
//添加根目錄
completeUrl = @"\\10.0.8.52\YuanXinFiles\Office\"; ;
//添加一級目錄
string relativeOneUrl = DateTime.Now.Year.ToString();
completeUrl += "\\" + relativeOneUrl;
relativeUrl += "\\" + relativeOneUrl;
if (!Directory.Exists(completeUrl))
{
    Directory.CreateDirectory(completeUrl);
}
//添加二級目錄
string relativeTwoUrl = DateTime.Now.Month.ToString();
completeUrl += "\\" + relativeTwoUrl;
relativeUrl += "\\" + relativeTwoUrl;
if (!Directory.Exists(completeUrl))
{
     Directory.CreateDirectory(completeUrl);
}
#endregion   
 
//保存
byte[] bytes = Convert.FromBase64String(strPic.picCode);
MemoryStream memStream = new MemoryStream(bytes);
BinaryFormatter binFormatter = new BinaryFormatter();
System.Drawing.Bitmap map = new Bitmap(memStream);
Image image = (Image)map; 
string imageName = Guid.NewGuid().ToString("N");

//保存圖片
image.Save(completeUrl + "\\" + imageName + "." + strPic.picType);  //保存圖片

C-跨域保存問題：

跨域的常見場景如下圖所示：我們通過電腦的網絡影射，連接到所需要的目錄，這裡添加上擁有權限的人員賬號即可訪問目標文件夾,那麼使用C#代碼如何獲得訪問權限呢？

要獲取以上訪問權限，需要引用一個類和添加一些簡單代碼：

1-訪問代碼：

/// <summary>
        /// 通過指定用戶執行上次圖片操作
        /// </summary>
        /// <param name="uploadAction"></param>
        public void UploadFileByUser(Action uploadAction)
        {
            //參考類：D:\SourceCode\MCSFramework\02.Develop\MobileWebApp\YuanXin\Services\FileUploadService\Controllers\UploadController.cs
            //無法通過權限認證--只能通過外網訪問
            try
            {
                var ip = "10.0.8.52";
                var domain = "sinooceanland";
                var username = ConfigurationManager.AppSettings["uploadUserName"].ToString();  //配置的用戶名
                var pwd = ConfigurationManager.AppSettings["uploadPassword"].ToString();    //配置的密碼
                var root = ConfigurationManager.AppSettings["uploadRootPath"].ToString();   //配置的文件根路徑

                using (NetworkShareAccesser.Access(ip, domain, username, pwd))  //建立連接
                {
                    uploadAction();   //圖片保存代碼
                }
            }
            catch (System.Exception e)
            {

            }
        }

2-必須類：

public class NetworkShareAccesser : IDisposable
    {
        private string _remoteUncName;
        private string _remoteComputerName;

        public string RemoteComputerName
        {
            get
            {
                return this._remoteComputerName;
            }
            set
            {
                this._remoteComputerName = value;
                this._remoteUncName = @"\\" + this._remoteComputerName;
            }
        }

        public string UserName
        {
            get;
            set;
        }
        public string Password
        {
            get;
            set;
        }

        #region Consts

        private const int RESOURCE_CONNECTED = 0x00000001;
        private const int RESOURCE_GLOBALNET = 0x00000002;
        private const int RESOURCE_REMEMBERED = 0x00000003;

        private const int RESOURCETYPE_ANY = 0x00000000;
        private const int RESOURCETYPE_DISK = 0x00000001;
        private const int RESOURCETYPE_PRINT = 0x00000002;

        private const int RESOURCEDISPLAYTYPE_GENERIC = 0x00000000;
        private const int RESOURCEDISPLAYTYPE_DOMAIN = 0x00000001;
        private const int RESOURCEDISPLAYTYPE_SERVER = 0x00000002;
        private const int RESOURCEDISPLAYTYPE_SHARE = 0x00000003;
        private const int RESOURCEDISPLAYTYPE_FILE = 0x00000004;
        private const int RESOURCEDISPLAYTYPE_GROUP = 0x00000005;

        private const int RESOURCEUSAGE_CONNECTABLE = 0x00000001;
        private const int RESOURCEUSAGE_CONTAINER = 0x00000002;


        private const int CONNECT_INTERACTIVE = 0x00000008;
        private const int CONNECT_PROMPT = 0x00000010;
        private const int CONNECT_REDIRECT = 0x00000080;
        private const int CONNECT_UPDATE_PROFILE = 0x00000001;
        private const int CONNECT_COMMANDLINE = 0x00000800;
        private const int CONNECT_CMD_SAVECRED = 0x00001000;

        private const int CONNECT_LOCALDRIVE = 0x00000100;

        #endregion

        #region Errors

        private const int NO_ERROR = 0;

        private const int ERROR_ACCESS_DENIED = 5;
        private const int ERROR_ALREADY_ASSIGNED = 85;
        private const int ERROR_BAD_DEVICE = 1200;
        private const int ERROR_BAD_NET_NAME = 67;
        private const int ERROR_BAD_PROVIDER = 1204;
        private const int ERROR_CANCELLED = 1223;
        private const int ERROR_EXTENDED_ERROR = 1208;
        private const int ERROR_INVALID_ADDRESS = 487;
        private const int ERROR_INVALID_PARAMETER = 87;
        private const int ERROR_INVALID_PASSWORD = 1216;
        private const int ERROR_MORE_DATA = 234;
        private const int ERROR_NO_MORE_ITEMS = 259;
        private const int ERROR_NO_NET_OR_BAD_PATH = 1203;
        private const int ERROR_NO_NETWORK = 1222;

        private const int ERROR_BAD_PROFILE = 1206;
        private const int ERROR_CANNOT_OPEN_PROFILE = 1205;
        private const int ERROR_DEVICE_IN_USE = 2404;
        private const int ERROR_NOT_CONNECTED = 2250;
        private const int ERROR_OPEN_FILES = 2401;

        #endregion

        #region PInvoke Signatures

        [DllImport("Mpr.dll")]
        private static extern int WNetUseConnection(
            IntPtr hwndOwner,
            NETRESOURCE lpNetResource,
            string lpPassword,
            string lpUserID,
            int dwFlags,
            string lpAccessName,
            string lpBufferSize,
            string lpResult
            );

        [DllImport("Mpr.dll")]
        private static extern int WNetCancelConnection2(
            string lpName,
            int dwFlags,
            bool fForce
            );

        [StructLayout(LayoutKind.Sequential)]
        private class NETRESOURCE
        {
            public int dwScope = 0;
            public int dwType = 0;
            public int dwDisplayType = 0;
            public int dwUsage = 0;
            public string lpLocalName = "";
            public string lpRemoteName = "";
            public string lpComment = "";
            public string lpProvider = "";
        }

        #endregion

        /// <summary>
        /// Creates a NetworkShareAccesser for the given computer name. The user will be promted to enter credentials
        /// </summary>
        /// <param name="remoteComputerName"></param>
        /// <returns></returns>
        public static NetworkShareAccesser Access(string remoteComputerName)
        {
            return new NetworkShareAccesser(remoteComputerName);
        }

        /// <summary>
        /// Creates a NetworkShareAccesser for the given computer name using the given domain/computer name, username and password
        /// </summary>
        /// <param name="remoteComputerName"></param>
        /// <param name="domainOrComuterName"></param>
        /// <param name="userName"></param>
        /// <param name="password"></param>
        public static NetworkShareAccesser Access(string remoteComputerName, string domainOrComuterName, string userName, string password)
        {
            return new NetworkShareAccesser(remoteComputerName,
                                            domainOrComuterName + @"\" + userName,
                                            password);
        }

        /// <summary>
        /// Creates a NetworkShareAccesser for the given computer name using the given username (format: domainOrComputername\Username) and password
        /// </summary>
        /// <param name="remoteComputerName"></param>
        /// <param name="userName"></param>
        /// <param name="password"></param>
        public static NetworkShareAccesser Access(string remoteComputerName, string userName, string password)
        {
            return new NetworkShareAccesser(remoteComputerName,
                                            userName,
                                            password);
        }

        private NetworkShareAccesser(string remoteComputerName)
        {
            RemoteComputerName = remoteComputerName;

            this.ConnectToShare(this._remoteUncName, null, null, true);
        }

        private NetworkShareAccesser(string remoteComputerName, string userName, string password)
        {
            RemoteComputerName = remoteComputerName;
            UserName = userName;
            Password = password;

            this.ConnectToShare(this._remoteUncName, this.UserName, this.Password, false);
        }

        private void ConnectToShare(string remoteUnc, string username, string password, bool promptUser)
        {
            NETRESOURCE nr = new NETRESOURCE
            {
                dwType = RESOURCETYPE_DISK,
                lpRemoteName = remoteUnc
            };

            int result;
            if (promptUser)
            {
                result = WNetUseConnection(IntPtr.Zero, nr, "", "", CONNECT_INTERACTIVE | CONNECT_PROMPT, null, null, null);
            }
            else
            {
                result = WNetUseConnection(IntPtr.Zero, nr, password, username, 0, null, null, null);
            }

            if (result != NO_ERROR)
            {
                throw new Win32Exception(result);
            }
        }

        private void DisconnectFromShare(string remoteUnc)
        {
            int result = WNetCancelConnection2(remoteUnc, CONNECT_UPDATE_PROFILE, false);
            if (result != NO_ERROR)
            {
                throw new Win32Exception(result);
            }
        }

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        /// <filterpriority>2</filterpriority>
        public void Dispose()
        {
            this.DisconnectFromShare(this._remoteUncName);
        }
    }