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_getHostByNameHook = LocalHook.Create(
InTargetProc: LocalHook.GetProcAddress("ws2_32.dll", "gethostbyname"),
InNewProc: new GetHostByNameDelegate(getHostByNameHooked),
InCallback: this); [UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Ansi, SetLastError = false)]
private delegate IntPtr GetHostByNameDelegate(string name); private static IntPtr getHostByNameHooked(string name)
{
// redirect ...
//if (name.StartsWith("www.google.com"))
//{
// return Native.GetHostByName("127.0.0.1");
//}
return Native.gethostbyname(name);
} 
import { HttpModule } from '@angular/http';
@NgModule({
imports: [
HttpModule
]
using System.IO;
using System.Net.Mime;
using System.Web.Mvc;
namespace MvcWatermark.Controllers
{
public class HomeController : Controller
{
const int ADay = 86400;
public ActionResult Index()
{
return View();
}
[OutputCache(VaryByParam = "fileName", Duration = ADay)]
public ActionResult Image(string fileName)
{
fileName = Path.GetFileName(fileName); // تمیز سازی امنیتی است
var rootPath = Server.MapPath("~/App_Data/Images");
var path = Path.Combine(rootPath, fileName);
if (!System.IO.File.Exists(path))
{
var notFoundImage = "notFound.png";
path = Path.Combine(rootPath, notFoundImage);
return File(path, MediaTypeNames.Image.Gif, notFoundImage);
}
return File(path, MediaTypeNames.Image.Gif, fileName);
}
}
}<img src="@Url.Action(actionName: "Image", controllerName: "Home", routeValues: new { fileName = "EF_Stra_08.gif" })" /> private bool isEmbeddedIntoAnotherDomain
{
get
{
return this.HttpContext.Request.UrlReferrer != null &&
!this.HttpContext.Request.Url.Host.Equals(this.HttpContext.Request.UrlReferrer.Host,
StringComparison.InvariantCultureIgnoreCase);
}
} private byte[] addWaterMark(string filePath, string text)
{
var image = new WebImage(filePath);
image.AddTextWatermark(text);
return image.GetBytes();
}A Graphics object cannot be created from an image that has an indexed pixel format.
PixelFormatUndefined PixelFormatDontCare PixelFormat1bppIndexed PixelFormat4bppIndexed PixelFormat8bppIndexed PixelFormat16bppGrayScale PixelFormat16bppARGB1555
private byte[] addWaterMark(string filePath, string text)
{
using (var img = System.Drawing.Image.FromFile(filePath))
{
using (var memStream = new MemoryStream())
{
using (var bitmap = new Bitmap(img))//avoid gdi+ errors
{
bitmap.Save(memStream, ImageFormat.Png);
var webImage = new WebImage(memStream);
webImage.AddTextWatermark(text, verticalAlign: "Top", horizontalAlign: "Left", fontColor: "Brown");
return webImage.GetBytes();
}
}
}
} if (isEmbeddedIntoAnotherDomain)
{
var text = Url.Action(actionName: "Index", controllerName: "Home", routeValues: null, protocol: "http");
var content = addWaterMark(path, text);
return File(content, MediaTypeNames.Image.Gif, fileName);
}
return File(path, MediaTypeNames.Image.Gif, fileName);
public async Task DoSomethingWithCustomer(Customer customer)
{
using var dbContext = new AppDbContext();
// ...
} services.AddDbContextPool<AppDbContext>(); public async Task DoSomethingWithCustomer(Customer customer)
{
using var scope = _serviceProvider.CreateScope();
var dbContext = scope.ServiceProvider.GetRequiredService<AppDbContext>();
var httpClient = scope.ServiceProvider.GetRequiredService<IHttpClientFactory>().CreateClient();
// ...
} public interface IOrderHistoryService
{
Task BuildCustomerHistory();
}
public class OrderHistoryService : IOrderHistoryService
{
private AppDbContext _dbContext;
public OrderHistoryService(AppDbContext dbContext)
{
_dbContext = dbContext;
}
public async Task BuildCustomerHistory()
{
// ...
}
}