C# IOException:由于文件锁定,无法删除图像
我无法从我的服务器路径中删除图像文件。这会导致错误,进程无法访问文件“FileName”,因为它正被另一个进程使用。我尝试了许多方法,但仍然徒劳无功。请帮我解决这个问题 这是我的代码片段C# IOException:由于文件锁定,无法删除图像,c#,ioexception,C#,Ioexception,我无法从我的服务器路径中删除图像文件。这会导致错误,进程无法访问文件“FileName”,因为它正被另一个进程使用。我尝试了许多方法,但仍然徒劳无功。请帮我解决这个问题 这是我的代码片段 using System; using System.Data; using System.Web; using System.Data.SqlClient; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Globali
using System;
using System.Data;
using System.Web;
using System.Data.SqlClient;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Globalization;
using System.Web.Security;
using System.Text;
using System.DirectoryServices;
using System.Collections;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
//============ Main Block =================
byte[] data = (byte[])ds.Tables[0].Rows[0][0];
MemoryStream ms = new MemoryStream(data);
Image returnImage = Image.FromStream(ms);
returnImage.Save(Server.MapPath(".\\TmpImages\\SavedImage.jpg"), System.Drawing.Imaging.ImageFormat.Jpeg);
returnImage.Dispose(); \\ I Tried this Dispose Method To Unlock The File But Nothing Done.
ms.Close(); \\ I Tried The Memory Stream Close Method Also But Its Also Not Worked For Me.
watermark(); \\ Here is My Water Mark Method That Print Water Mark Image on My Saved Image (Image That is Converted From Byte Array)
DeleteImages(); \\ Here is My Delete Method That I Call To Delete The Images
//===== ==== My Delete Method To Delete Files==================
public void DeleteImages()
{
try
{
File.Delete(Server.MapPath(".\\TmpImages\\WaterMark.jpg")); \\This Image Deleted Fine.
File.Delete(Server.MapPath(".\\TmpImages\\SavedImage.jpg")); \\ Exception Thrown On Deleting of This Image.
}
catch (Exception ex)
{
LogManager.LogException(ex, "Error in Deleting Images.");
Master.ShowMessage(ex.Message, true);
}
}
\\ ==== Method Declartion That Make Watermark of One Image On Another Image.=======
public void watermark()
{
//create a image object containing the photograph to watermark
Image imgPhoto = Image.FromFile(Server.MapPath(".\\TmpImages\\SavedImage.jpg"));
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
//create a Bitmap the Size of the original photograph
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//load the Bitmap into a Graphics object
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//create a image object containing the watermark
Image imgWatermark = new Bitmap(Server.MapPath(".\\TmpImages\\PrintasWatermark.jpg"));
int wmWidth = imgWatermark.Width;
int wmHeight = imgWatermark.Height;
//Set the rendering quality for this Graphics object
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
//Draws the photo Image object at original size to the graphics object.
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//-------------------------------------------------------
//to maximize the size of the Copyright message we will
//test multiple Font sizes to determine the largest posible
//font we can use for the width of the Photograph
//define an array of point sizes you would like to consider as possiblities
//-------------------------------------------------------
//Define the text layout by setting the text alignment to centered
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
//define a Brush which is semi trasparent black (Alpha set to 153)
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
//define a Brush which is semi trasparent white (Alpha set to 153)
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
//------------------------------------------------------------
//Step #2 - Insert Watermark image
//------------------------------------------------------------
//Create a Bitmap based on the previously modified photograph Bitmap
Bitmap bmWatermark = new Bitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//Load this Bitmap into a new Graphic Object
Graphics grWatermark = Graphics.FromImage(bmWatermark);
//To achieve a transulcent watermark we will apply (2) color
//manipulations by defineing a ImageAttributes object and
//seting (2) of its properties.
ImageAttributes imageAttributes = new ImageAttributes();
//The first step in manipulating the watermark image is to replace
//the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0)
//to do this we will use a Colormap and use this to define a RemapTable
ColorMap colorMap = new ColorMap();
//My watermark was defined with a background of 100% Green this will
//be the color we search for and replace with transparency
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
//The second color manipulation is used to change the opacity of the
//watermark. This is done by applying a 5x5 matrix that contains the
//coordinates for the RGBA space. By setting the 3rd row and 3rd column
//to 0.3f we achive a level of opacity
float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.3f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}};
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
ColorAdjustType.Bitmap);
//For this example we will place the watermark in the upper right
//hand corner of the photograph. offset down 10 pixels and to the
//left 10 pixles
int xPosOfWm = ((phWidth - wmWidth) - 10);
int yPosOfWm = 10;
grWatermark.DrawImage(imgWatermark,
new Rectangle(xPosOfWm, yPosOfWm, wmWidth, wmHeight), //Set the detination Position
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
wmWidth, // Watermark Width
wmHeight, // Watermark Height
GraphicsUnit.Pixel, // Unit of measurment
imageAttributes); //ImageAttributes Object
//Replace the original photgraphs bitmap with the new Bitmap
imgPhoto = bmWatermark;
grPhoto.Dispose();
grWatermark.Dispose();
//save new image to file system.
imgPhoto.Save(Server.MapPath(".\\TmpImages\\WaterMark.jpg"), ImageFormat.Jpeg);
imgPhoto.Dispose();
imgWatermark.Dispose();
}
由Mark Russinovich
和Bryce Cogswell
使用,找出哪个进程锁定了文件。可能是您的防病毒软件或其他原因。请使用Mark Russinovich
和Bryce Cogswell
并找出锁定文件的进程。可能是你的防病毒软件或其他东西。使用“使用”结构。如果代码引发异常,流和图像将不会被释放,这可能导致锁定文件
using (MemoryStream ms = new MemoryStream( data ))
using (Image img = Image.FromStream(ms))
{
//do sth with image
}
另外,如果您使用水印方法重新打开图像,也应该将其放置在那里。使用“使用”构造。如果代码引发异常,流和图像将不会被释放,这可能导致锁定文件
using (MemoryStream ms = new MemoryStream( data ))
using (Image img = Image.FromStream(ms))
{
//do sth with image
}
imgPhoto = bmWatermark;
另外,如果你用水印方法重新打开图像,你也应该在那里处理它
imgPhoto = bmWatermark;
这是您的问题,您没有首先调用imgPhoto.Dispose()。文件被锁定,直到终结器线程运行,这可能需要一段时间
使用using语句可以避免这样的错误
这是您的问题,您没有首先调用imgPhoto.Dispose()。文件被锁定,直到终结器线程运行,这可能需要一段时间
使用using语句可以避免类似的错误。我也有同样的问题。因此,我使用SysInternals查看是否有另一个进程(如我的防病毒软件)正在锁定它。对我来说确实如此,尽管实时备份服务也在争夺该文件 为了解决这个问题,我使用以下方法多次尝试删除该文件,因为另一个进程通常只在很短的时间内持有一个锁
public class FileHelper
{
public static void Delete(string path)
{
int attempts = 0;
const int maxAttempts = 3;
do
{
try
{
attempts++;
File.Delete(path);
if (attempts > 1) Trace.TraceInformation("File delete succeeded");
return;
}
catch (IOException)
{
Trace.TraceWarning("Could not access file for delete, attempt {0} of {1}", attempts, maxAttempts);
if (attempts >= maxAttempts) throw;
}
}
while (attempts < maxAttempts);
}
}
公共类FileHelper
{
公共静态无效删除(字符串路径)
{
int=0;
常量int最大尝试数=3;
做
{
尝试
{
尝试++;
删除(路径);
如果(尝试次数>1)Trace.TraceInformation(“文件删除成功”);
返回;
}
捕获(IOException)
{
Trace.TraceWarning(“无法访问文件进行删除,尝试{1}中的{0}”,尝试,最大尝试);
如果(尝试次数>=最大尝试次数)抛出;
}
}
while(尝试次数<最大尝试次数);
}
}
我也有同样的问题。因此,我使用SysInternals查看是否有另一个进程(如我的防病毒软件)正在锁定它。对我来说确实如此,尽管实时备份服务也在争夺该文件
为了解决这个问题,我使用以下方法多次尝试删除该文件,因为另一个进程通常只在很短的时间内持有一个锁
public class FileHelper
{
public static void Delete(string path)
{
int attempts = 0;
const int maxAttempts = 3;
do
{
try
{
attempts++;
File.Delete(path);
if (attempts > 1) Trace.TraceInformation("File delete succeeded");
return;
}
catch (IOException)
{
Trace.TraceWarning("Could not access file for delete, attempt {0} of {1}", attempts, maxAttempts);
if (attempts >= maxAttempts) throw;
}
}
while (attempts < maxAttempts);
}
}
公共类FileHelper
{
公共静态无效删除(字符串路径)
{
int=0;
常量int最大尝试数=3;
做
{
尝试
{
尝试++;
删除(路径);
如果(尝试次数>1)Trace.TraceInformation(“文件删除成功”);
返回;
}
捕获(IOException)
{
Trace.TraceWarning(“无法访问文件进行删除,尝试{1}中的{0}”,尝试,最大尝试);
如果(尝试次数>=最大尝试次数)抛出;
}
}
while(尝试次数<最大尝试次数);
}
}
显示水印代码。没有它还能用吗?始终关闭文件流。服务器路径是否指向Unix路径???。显示水印代码。没有它还能用吗?始终关闭文件流。服务器路径是否指向Unix路径??。