C#實現(xiàn)圖片上傳（PC端和APP）保存及 跨域上傳說明
來源：本站原創(chuàng)|時間：2020-01-10|欄目：C#教程|點擊： 次
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" style="height:34px;padding-top:5px;padding-bottom:5px;" multiple />
2-后臺獲取圖片文件：
HttpFileCollection pcFileColl = HttpContext.Current.Request.Files;
3-保存示例：
#region 創(chuàng)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：
前端頁面長什么樣不管了，后臺拿到的是base64的字符串集合.
1-保存示例：
#region 創(chuàng)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(wǎng)絡(luò)影射，連接到所需要的目錄，這里添加上擁有權(quán)限的人員賬號即可訪問目標(biāo)文件夾,那么使用C#代碼如何獲得訪問權(quán)限呢？
要獲取以上訪問權(quán)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(zhí)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(quán)限認(rèn)證--只能通過外網(wǎng)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);
}
}
以上所述是小編給大家介紹的C#實現(xiàn)圖片上傳（PC端和APP）保存及 跨域上傳說明，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復(fù)大家的。在此也非常感謝大家對我們網(wǎng)站的支持！
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