Windows Phone 8 新增功能：對SD卡的訪問

Windows Phone 8 新增加了對 SD 記憶卡的支援，開發人員可以直接存取SD卡非加密的內容，但無法執行Write操作

而且使用者可以將已通過審核的應用拷貝到SD上進行安裝，只是在安裝的過程中需要使用者手機連網到marketplace上進行驗證，如果是合法程式則可以直接安裝使用。

代碼中對SD卡操作需要添加 ID_CAP_REMOVABLE_STORAGE 能力，

使用程式碼片段，引用自官方Route mapper sample例子，完整例子請移步到：點擊開啟連結

 

        // Process a route from the SD card.        private async Task ProcessSDGPXFile(string _sdFilePath)        {            // Connect to the current SD card.            ExternalStorageDevice sdCard = (await ExternalStorage.GetExternalStorageDevicesAsync()).FirstOrDefault();            // If the SD card is present, get the route from the SD card.            if (sdCard != null)            {                try                {                    // Get the route (.GPX file) from the SD card.                    ExternalStorageFile file = await sdCard.GetFileAsync(_sdFilePath);                    // Create a stream for the route.                    Stream s = await file.OpenForReadAsync();                    // Read the route data.                    ReadGPXFile(s);                }                catch (FileNotFoundException)                {                    // The route is not present on the SD card.                    MessageBox.Show("That route is missing on your SD card.");                }            }            else            {                // No SD card is present.                MessageBox.Show("The SD card is mssing. Insert an SD card that has a Routes folder containing at least one .GPX file and try again.");            }        }