Graphics.DrawImage:内存不足异常

Question

我不能为我的生活弄清楚为什么我在这里得到一个内存不足的例外,即使经过对各种网站和论坛的大量研究.有人能够在这段代码中阐明所有邪恶的根源吗？调用Graphics.DrawImage()方法第79行引发异常.

[HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult EditImage(FileModel model)
    {
        var fileData = new MySite.Models.File(model.FileID, model.ClientID, ConfigurationManager.ConnectionStrings["MySite"].ConnectionString).Data;
        Image image = null;

        using (var memStream = new MemoryStream())
        {
            memStream.Write(fileData, 0, fileData.Length);
            image = Image.FromStream(memStream);
        }

        using (var graphics = Graphics.FromImage(image))
        {
            graphics.DrawImage(image, model.x1, model.y1, (model.x2 - model.x1), (model.y2 - model.y1));
            graphics.Save();
        }

        using (var memStream = new MemoryStream())
        {
            image.Save(memStream, System.Drawing.Imaging.ImageFormat.Jpeg);
            return File(memStream.ToArray(), "image/jpeg");
        }
    }

堆栈跟踪:

[OutOfMemoryException: Out of memory.]
System.Drawing.Graphics.CheckErrorStatus(Int32 status) +1143476
System.Drawing.Graphics.DrawImage(Image image, Int32 x, Int32 y, Int32 width, Int32 height) +141
ProPilot.Controllers.DocumentsController.EditImage(FileModel model) in C:\DEV\Web\Controllers\DocumentsController.cs:79
lambda_method(Closure , ControllerBase , Object[] ) +104
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +211
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +28
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +48
System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +57
System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +223
System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +48
System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +24
System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +102
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +43
System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +14
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +57
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +47
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +25
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +47
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9629296
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155 

Answer 1

@Sayse用上面的评论打了个响.

使用Image.FromStream时:

您必须在图像的生命周期内保持流打开.

来源:http://msdn.microsoft.com/en-AU/library/93z9ee4x.aspx

using (var memStream = new MemoryStream())
{
    memStream.Write(fileData, 0, fileData.Length);
    using(Image image = Image.FromStream(memStream))
    {
        using (var graphics = Graphics.FromImage(image))
        {
            graphics.DrawImage(image, model.x1, model.y1, (model.x2 - model.x1), (model.y2 - model.y1));
            graphics.Save();
        }

        using (var outStream = new MemoryStream())
        {
            image.Save(outStream, System.Drawing.Imaging.ImageFormat.Jpeg);
            return File(outStream.ToArray(), "image/jpeg");
        }
    }
}