[WindowsPhone] 關於Isolated Storage中存取讀取圖片
2013-07-29
最近在弄一些有關於Window Phone 的東西，其中我需要將圖片放到Isolated Storage 中
但是發現，網路上有許多文章做法試了卻沒用，最後在 Stack Overflow 上面有找到簡單的作法
所以就簡單包裝成兩個method 關於存取圖片至Isolated Storage
介紹一下畫面:
按下"存入圖片至Isolated Storage"後，將整個LayoutRoot 快照存入至Isolated Storage 的sample.jpg中..
之後按下"從IsolatedStorage讀圖"後將圖片Load 回至imgMain這Image物件中.
看一下主要的兩隻methods:
/// <summary>/// 從IsolatedStorage 中讀取圖片/// </summary>/// <param name="fileName"></param>/// <returns></returns>public static BitmapImage ReadImageFormIsolatedStorage(string fileName)
{ var bi = new BitmapImage();var isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication();
if (!isolatedStorage.FileExists(fileName)) return bi;
var fs = isolatedStorage.OpenFile(fileName, FileMode.Open, FileAccess.Read);
bi.SetSource(fs);
fs.Close();
return bi;}
/// <summary>/// 存圖片至Isolated Storage/// </summary>/// <param name="wb"></param>/// <param name="fileName"></param>/// <param name="orientation"></param>/// <param name="quality"></param>public static void SaveImageToIsolatedStorage(WriteableBitmap wb, string fileName, int orientation = 0, int quality = 70)
{var isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication();
if (isolatedStorage.FileExists(fileName))isolatedStorage.DeleteFile(fileName);
var fileStream = isolatedStorage.CreateFile(fileName);
wb.SaveJpeg(fileStream, wb.PixelWidth, wb.PixelHeight, orientation, quality);
fileStream.Close();
}
之後呼叫端
/// <summary>/// 存圖按下後/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnSave_Click(object sender, RoutedEventArgs e)
{SaveImageToIsolatedStorage(new WriteableBitmap(this.LayoutRoot, null), "sample.jpg", 100, 100);
}
/// <summary>/// 讀取圖片按下後/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnReadImage_Click(object sender, RoutedEventArgs e)
{ imgMain.Source = ReadImageFormIsolatedStorage("sample.jpg");}
結果:
很簡單吧，下方附上簡單測試的Source code.
Soruce code :