我无法从我的服务器路径中删除图像文件它会导致进程无法访问文件“FileName”的错误，因为它正被另一个进程使用。我尝试了很多方法，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.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();
}
答案 0 :(得分：2)
imgPhoto = bmWatermark;
有你的问题，你没有先调用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 语句来避免这样的错误。
答案 1 :(得分：1)
我有同样的问题。所以我使用了来自SysInternals的Process Monitor来查看我的防病毒软件之类的其他进程是否锁定了它。虽然实时备份服务也在争用该文件，但事实确实如此。
为了解决这个问题，我使用以下方法尝试多次删除文件，因为另一个进程通常只能在很短的时间内保持锁定。
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);
}
}
答案 2 :(得分：0)
Mark Russinovich和Bryce Cogswell使用Process Monitor，找出锁定文件的进程。也许这是你的杀毒软件或其他东西。
答案 3 :(得分：0)
使用“使用”构造。如果代码引发异常，则不会丢弃流和Image，这会导致锁定文件。
using (MemoryStream ms = new MemoryStream( data ))
using (Image img = Image.FromStream(ms))
{
//do sth with image
}
另外如果你用水印方法重新打开图像，你也应该把它放在那里。