在C#中捕获内存不足异常
时间：2023-02-22 09:37:23|栏目：.NET代码|点击： 次
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-
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-
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。
sBuilder.Insert(value: StudentSubject, index: StudentName.Length - 1, count: 1);
发生以下异常-
System.OutOfMemoryException: Out of memory
要捕获错误，请尝试以下代码-
示例：
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:
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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