VS2008開發環境，在進行.NET CF 3.5下的WM Socket編程時

Bitmap bmp = new Bitmap(Stream)處出現未處理異常

?（圖片引自:http://www.cnblogs.com/fsyiyun/archive/2011/03/30/1999672.html）?

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通過摸索，我發覺無論對對象進行內存回收，這個問題依然存在。

究其原因，個人猜測是Bitmap實例化時本身就會打開MemoryStream流，所以再用MemoryStream就很容易內存泄露

因此強列建議，當和Bitmap一起合用時，用?FileStream或其它變通方法替代MemoryStream，并及時內存回收。

以下是使用參考示例：

主要功能是：拍照上傳。

View Code public class PhotoHelper
{
BaseForm _form; //拍照上傳窗體
TextBox _txtFileName;?//顯示照片路徑
PictureBox _picPhoto;?//顯示照片縮略圖

public PhotoHelper(BaseForm form,TextBox txtFileName,PictureBox picPhoto)
{
_form = form;
_txtFileName = txtFileName;
_picPhoto = picPhoto;
_picPhoto.Image = new Bitmap(300, 350);

}

#region 拍照邏輯
public void TakePhoto()
{
//拍照-----------------------------
CameraCaptureDialog ccd = new CameraCaptureDialog();
ccd.Mode = CameraCaptureMode.Still;
ccd.Owner = _form;
ccd.Title = "拍照";
ccd.Resolution = new Size(1600, 1200);
ccd.StillQuality = CameraCaptureStillQuality.Normal;

if (ccd.ShowDialog() == DialogResult.OK)
{
//將拍好的以縮略圖顯示
ImageChangedArgs args = new ImageChangedArgs(ccd.FileName);
using (Graphics g = Graphics.FromImage(_picPhoto.Image))
{

g.DrawImage(args.Image,
new Rectangle(0, 0, _picPhoto.Image.Width, _picPhoto.Image.Height),
new Rectangle(0, 0, args.Image.Width, args.Image.Height),
GraphicsUnit.Pixel);

}
args.Dispose();
args = null;

_txtFileName.Text = ccd.FileName;


}
ccd.Dispose();
ccd = null;
}
#endregion #region 照片上傳邏輯

public void PhotoSave()
{
if (string.IsNullOrEmpty(_txtFileName.Text))
{
Global.ShowMsg("無照片可上傳");
return;
}

string prompt = "確認上傳照片？";
if (Global.ShowYesNoMsg(prompt) == DialogResult.No)
return;


//將照片轉換為byte[]
Byte[] b = FileToBytes(_txtFileName.Text);

#region todo 將Byte[] 通過webservice上傳服務器，在此請加入自己代碼
// CommandAndTaskIdObj commandObj = _form.CommandAndTaskIdObj;
//WsRmsg msg = Global.GetService().UpFile(commandObj.UserName, commandObj.CommandId ,commandObj.TaskId , b, _txtFileName.Text);
//if (msg.Flag == 0)
//{
// b = null;
// throw new Exception(msg.Emsg);
//}
#endregion

Global.ShowMsg("照片上傳成功");


_txtFileName.Text = string.Empty;
b = null;

}
#endregion

static byte[] FileToBytes(string sFilePath)
{
FileStream inFile = null;
try
{
byte[] binaryData;
inFile = new FileStream(sFilePath, FileMode.Open, FileAccess.Read);
binaryData = new Byte[inFile.Length];
long bytesRead = inFile.Read(binaryData, 0, (int)inFile.Length);
return binaryData;
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (inFile != null)
{
inFile.Close();
inFile.Dispose();
}
inFile = null;
}
}


internal void PhotoDispose()
{
throw new NotImplementedException();
}
}

public class ImageChangedArgs : EventArgs, IDisposable
{
private Bitmap image;
/// <summary>
/// used to create the thumbnail
/// </summary>
private Stream stream;
public ImageChangedArgs(string imageFilePath)
{

try
{
this.stream = new FileStream(imageFilePath, FileMode.Open, FileAccess.Read);
this.image = new Bitmap(this.stream);
}
catch(Exception ex)
{
this.image = null;
if (this.stream != null)
{
this.stream.Close();
this.stream = null;
}
}
}

public Bitmap Image
{
get
{
return this.image;
}
}

public Stream Stream
{
get
{
return this.stream;
}
}

#region IDisposable Members

public void Dispose()
{
if (this.image != null)
this.image.Dispose();
this.image = null;
if (this.stream != null)
{
this.stream.Close();
this.stream.Dispose();
}
this.stream = null;
}

#endregion
}

從上個例子可以看出，MemoryStream類基本上被FileStream替代。

當加載大的圖片時，只要內存允許，就不會報Exception異常?

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這是第二篇博客，如有錯誤請及時指出，歡迎留爪~~

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轉載于:https://www.cnblogs.com/lindaWei/archive/2012/01/17/2324523.html

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