当CLR未能分配所需的足够内存时，将发生System.OutOfMemoryException。System.OutOfMemoryException继承自System.SystemException类。OutOfMemoryException使用COR_E_OUTOFMEMORY值为 0x8007000E的 HRESULT 。
一个OutOfMemoryException异常异常主要有两个原因：
我们试图将StringBuilder对象扩展到超出其StringBuilder.MaxCapacity属性定义的长度。
公共语言运行时无法分配足够的连续内存来成功执行操作。任何需要分配内存的属性分配或方法调用都可能引发此异常。
设置字符串-
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string StudentName = "Tom";string StudentSubject = "Maths"; |
现在您需要使用分配的容量进行初始化，该容量是初始值的长度-
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StringBuilder sBuilder = new StringBuilder(StudentName.Length, StudentName.Length); |
现在，如果您尝试插入其他值，则会发生异常。
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sBuilder.Insert(value: StudentSubject, index: StudentName.Length - 1, count: 1); |
发生以下异常-
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System.OutOfMemoryException: Out of memory |
要捕获错误，请尝试以下代码-
示例：
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try { string videoSaveDir = CommonHelper.GetVideoDirectory(); int setCount = 0; #region 模拟抛出OutOfMemoryException用 //List<VideoExtend> dataSource = new List<VideoExtend>(); //dataSource.Add(new VideoExtend() { EHost="http://www.baidu.com",FileName="BAI.mp4"}); #endregion if (dataSource != null) { totalCount = dataSource.Count; } foreach (VideoExtend video in dataSource) { try { setCount++; string fileName = video.FileName; string fileFullPath = videoSaveDir + fileName; if (File.Exists(fileFullPath)) { if (!JudgeFileStatus(fileFullPath, fileName)) { continue; } string strFileSize = ""; if (!FileCanUpload(fileFullPath, out strFileSize)) { //数据库更新为上传失败，文件太大 if (mongoData == null) { apiHelper.UpdateUploadToQiniuFileTooLarge(video.EHost); } else { mongoData.UpdateUploadToQiniuFileTooLarge(video.EHost); } LogHelper.Log(LogFilePrefix+"uploadFileTooLarge", "文件" + fileName + "太大，大小为：" + strFileSize); continue; } LogHelper.Log(LogFilePrefix + "uploadInfo", "开始上传" + setCount + "/" + totalCount + "文件：" + video.FileName); string newFileName = ""; bool updateStatus = QiniuUtil.Upload(fileFullPath, out newFileName); if (updateStatus) { if (mongoData == null) { apiHelper.UpdateUploadToQiniuSuccessStatus(video.EHost, newFileName); } else { mongoData.UpdateUploadToQiniuSuccessStatus(video.EHost, newFileName);//更新数据库 } LogHelper.Log(LogFilePrefix + "uploadsuccess", "上传成功，源文件名：" + video.FileName + "；新文件名：" + newFileName); if (JudgeFileStatus(fileFullPath, fileName)) { try { File.Delete(fileFullPath); } catch (Exception ex) { } } setCount++; } } else { //把数据库重置为要重新下载 if (mongoData == null) { apiHelper.UpdateUploadToQiniuLocalFileNotFound(video.EHost); } else { mongoData.UpdateUploadToQiniuLocalFileNotFound(video.EHost); } LogHelper.Log(LogFilePrefix + "uploadNoExisted", "文件不存在:" + fileName); //throw new System.OutOfMemoryException();//模拟抛出OutOfMemoryException用 } } catch (System.OutOfMemoryException memoryEx) { Global.IsOutOfMemoryException = true; LogHelper.LogWithLock(LogFilePrefix + "uploadOutOfMemoryException", "失败，文件名" + video.FileName + "，异常信息:" + memoryEx.Message + ";内部错误" + memoryEx.InnerException?.Message); } catch (Exception ex) { LogHelper.Log(LogFilePrefix + "uploadError", "失败，文件名" + video.FileName + "，异常信息:" + ex.Message + ";内部错误" + ex.InnerException.Message); } System.Threading.Thread.Sleep(5 * 1000);//休眠 } if (setCount <= 0) { LogHelper.Log(LogFilePrefix + "uploadInfo", "暂无新待上传数据"); } int sleepSecond = 30; LogHelper.Log(LogFilePrefix + "uploadInfo", "--休眠" + sleepSecond + "秒"); System.Threading.Thread.Sleep(sleepSecond * 1000);//休眠 } catch (Exception ex) { LogHelper.Log(LogFilePrefix + "uploadfullerror", "失败，异常信息:" + ex.Message+ ";totalCount="+ totalCount); } |
上面处理OutOfMemoryException并生成以下错误-
输出结果：
Error:
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Global.IsOutOfMemoryException = true; LogHelper.LogWithLock(LogFilePrefix + "uploadOutOfMemoryException", "失败，文件名" + video.FileName + "，异常信息:" + memoryEx.Message + ";内部错误" + memoryEx.InnerException?.Message); |
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