Bitmap Extension Methods; for Resize, Crop and save

by Pieter Brinkman 24. July 2008 08:11

For Bitmap manipulation I wrote three extension methods. With this method you can resize, crop and save (as jpg) your image.

 

Resize Method

public static Bitmap resizeImage(this Bitmap input, Size size)

{

int sourceWidth = input.Width;

int sourceHeight = input.Height;

float nPercent = 0;

float nPercentW = 0;

float nPercentH = 0;

nPercentW = ((float)size.Width / (float)sourceWidth);nPercentH = ((float)size.Height / (float)sourceHeight);

if (nPercentH < nPercentW)

nPercent = nPercentH;

else

nPercent = nPercentW;

int destWidth = (int)(sourceWidth * nPercent);

int destHeight = (int)(sourceHeight * nPercent);

Bitmap b = new Bitmap(destWidth, destHeight);

Graphics g = Graphics.FromImage(b);g.InterpolationMode = InterpolationMode.HighQualityBicubic;

g.DrawImage(input, 0, 0, destWidth, destHeight);

g.Dispose();

return b;

}

 

Crop Method

public static Bitmap cropImage(this Bitmap input, Rectangle cropArea)

{

Bitmap bmpImage = new Bitmap(input);Bitmap bmpCrop = bmpImage.Clone(cropArea, input.PixelFormat);

return (System.Drawing.Bitmap)(bmpCrop);

}

 

Safe Method

public static void saveJpeg(this Bitmap img, string path, long quality)

{

// Encoder parameter for image quality

EncoderParameter qualityParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);

// Jpeg image codec

ImageCodecInfo jpegCodec = getEncoderInfo("image/jpeg"); if (jpegCodec == null)

return;

EncoderParameters encoderParams = new EncoderParameters(1);

encoderParams.Param[0] = qualityParam;

img.Save(path, jpegCodec, encoderParams);

}

public static ImageCodecInfo getEncoderInfo(string mimeType)

{

// Get image codecs for all image formats

ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

// Find the correct image codec

for (int i = 0; i < codecs.Length; i++)

if (codecs[i].MimeType == mimeType)

return codecs[i]; return null;

}

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ListView: OnItemDataBound

by Pieter Brinkman 23. July 2008 22:57

Get dataItem onItemDataBound (don't forget to replace the bold parts with your objectname):

protected void MainPostListView_ItemDataBound(object sender, ListViewItemEventArgs e)

{

YourObject item = (YourObject)((ListViewDataItem)e.Item).DataItem;

}

 

Findcontrol within the itemtemplate:

HyperLink hplTitle = (HyperLink)e.Item.FindControl("hyperLink");

 

 

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String.Format with C#

by Pieter Brinkman 10. July 2008 06:20

In this post I will add examples of String.Format or links to sites with good examples. 

 

Double

// just two decimal places
 String.Format("{0:0.00}", 123.4567);      // "123.46"
 String.Format("{0:0.00}", 123.4);         // "123.40"
 String.Format("{0:0.00}", 123.0);         // "123.00"

// max. two decimal places
 String.Format("{0:0.##}", 123.4567);      // "123.46"
 String.Format("{0:0.##}", 123.4);         // "123.4"
 String.Format("{0:0.##}", 123.0);         // "123"

// at least two digits before decimal point
 String.Format("{0:00.0}", 123.4567);      // "123.5"
 String.Format("{0:00.0}", 23.4567);       // "23.5"
 String.Format("{0:00.0}", 3.4567);        // "03.5"
 String.Format("{0:00.0}", -3.4567);       // "-03.5"

String.Format("{0:0,0.0}", 12345.67);     // "12,345.7"
 String.Format("{0:0,0}", 12345.67);       // "12,346"

String.Format("{0:0.0}", 0.0);            // "0.0"
 String.Format("{0:0.#}", 0.0);            // "0"
 String.Format("{0:#.0}", 0.0);            // ".0"
 String.Format("{0:#.#}", 0.0);            // ""

String.Format("{0,10:0.0}", 123.4567);    // "     123.5"
 String.Format("{0,-10:0.0}", 123.4567);   // "123.5     "
 String.Format("{0,10:0.0}", -123.4567);   // "    -123.5"
 String.Format("{0,-10:0.0}", -123.4567);  // "-123.5    "

String.Format("{0:0.00;minus 0.00;zero}", 123.4567);   // "123.46"
 String.Format("{0:0.00;minus 0.00;zero}", -123.4567);  // "minus 123.46"
 String.Format("{0:0.00;minus 0.00;zero}", 0.0);        // "zero"

Source: http://www.csharp-examples.net/string-format-double/

 

Integer

String.Format("{0:00000}", 15);          // "00015"
 String.Format("{0:00000}", -15);         // "-00015"

String.Format("{0,5}", 15);              // "   15"
 String.Format("{0,-5}", 15);             // "15   "
 String.Format("{0,5:000}", 15);          // "  015"
 String.Format("{0,-5:000}", 15);         // "015  "

String.Format("{0:#;minus #}", 15);      // "15"
 String.Format("{0:#;minus #}", -15);     // "minus 15"
 String.Format("{0:#;minus #;zero}", 0);  // "zero"

String.Format("{0:+### ### ### ###}", 447900123456); // "+447 900 123 456"
 String.Format("{0:##-####-####}", 8958712551);       // "89-5871-2551"

Source:  http://www.csharp-examples.net/string-format-int/

 

DateTime

// create date time 2008-03-09 16:05:07.123
 DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123);

String.Format("{0:y yy yyy yyyy}", dt);  // "8 08 008 2008"   year
 String.Format("{0:M MM MMM MMMM}", dt);  // "3 03 Mar March"  month
 String.Format("{0:d dd ddd dddd}", dt);  // "9 09 Sun Sunday" day
 String.Format("{0:h hh H HH}",     dt);  // "4 04 16 16"      hour 12/24
 String.Format("{0:m mm}",          dt);  // "5 05"            minute
 String.Format("{0:s ss}",          dt);  // "7 07"            second
 String.Format("{0:f ff fff ffff}", dt);  // "1 12 123 1230"   sec.fraction
 String.Format("{0:F FF FFF FFFF}", dt);  // "1 12 123 123"    without zeroes
 String.Format("{0:t tt}",          dt);  // "P PM"            A.M. or P.M.
 String.Format("{0:z zz zzz}",      dt);  // "-6 -06 -06:00"   time zone

// date separator in german culture is "." (so "/" changes to ".")
 String.Format("{0:d/M/yyyy HH:mm:ss}", dt); // "9/3/2008 16:05:07" - english (en-US)
 String.Format("{0:d/M/yyyy HH:mm:ss}", dt); // "9.3.2008 16:05:07" - german (de-DE)

// month/day numbers without/with leading zeroes
 String.Format("{0:M/d/yyyy}", dt);            // "3/9/2008"
 String.Format("{0:MM/dd/yyyy}", dt);          // "03/09/2008"

// day/month names
 String.Format("{0:ddd, MMM d, yyyy}", dt);    // "Sun, Mar 9, 2008"
 String.Format("{0:dddd, MMMM d, yyyy}", dt);  // "Sunday, March 9, 2008"

// two/four digit year
 String.Format("{0:MM/dd/yy}", dt);            // "03/09/08"
 String.Format("{0:MM/dd/yyyy}", dt);          // "03/09/2008"

String.Format("{0:t}", dt);  // "4:05 PM"                         ShortTime
 String.Format("{0:d}", dt);  // "3/9/2008"                        ShortDate
 String.Format("{0:T}", dt);  // "4:05:07 PM"                      LongTime
 String.Format("{0:D}", dt);  // "Sunday, March 09, 2008"          LongDate
 String.Format("{0:f}", dt);  // "Sunday, March 09, 2008 4:05 PM"  LongDate+ShortTime
 String.Format("{0:F}", dt);  // "Sunday, March 09, 2008 4:05:07 PM" FullDateTime
 String.Format("{0:g}", dt);  // "3/9/2008 4:05 PM"                ShortDate+ShortTime
 String.Format("{0:G}", dt);  // "3/9/2008 4:05:07 PM"             ShortDate+LongTime
 String.Format("{0:m}", dt);  // "March 09"                        MonthDay
 String.Format("{0:y}", dt);  // "March, 2008"                     YearMonth
 String.Format("{0:r}", dt);  // "Sun, 09 Mar 2008 16:05:07 GMT"   RFC1123
 String.Format("{0:s}", dt);  // "2008-03-09T16:05:07"             SortableDateTime
 String.Format("{0:u}", dt);  // "2008-03-09 16:05:07Z"            UniversalSortableDateTime

Source: http://www.csharp-examples.net/string-format-datetime/

 

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convert UnixTime to DateTime

by Pieter Brinkman 4. July 2008 05:29

In an RSS feed I only had an UnixTime. For presentation I needed to convert this string to datetime. I did this with this code

DateTime itemDateTime = new DateTime(1970, 1, 1, 0, 0, 0).AddSeconds(item.unixTime);

 

No idea what it does but it works :D

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