window phone7开发中的性能、内存使用监控方法

window phone7对手机硬件有对应要求，其中一项是手机内存不低于256M，这对运行在手机上的应用也带来了限制，那就是资源分配；所以在开发过程中关注自己应用的资源使用情况是非常有必要的，如果应用占用资源过多，在提交marketplace时，提交审核过程可能会被拒绝，那么就这里就分享下，内存实时监控的方法了。
原理是使用 DeviceExtendedProperties.GetValue("ApplicationCurrentMemoryUsage")获取应用使用的内存，然后启用一个timer定时查询并显示到ui上，为了不影响应用在正常情况下的使用，只有在debug时将内存使用情况显示出来，这样可以看到在各个页面上运行时内存使用情况，可以分析内存消耗在具体哪个地方；
代码如下：

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Controls.Primitives;
using System.Windows.Threading;
using Microsoft.Phone.Info;
using System.Diagnostics;
using System.Collections.Generic;
namespace ScrollViewerStyle
{
public class MemoryDiagnostics
{

    }
    /// <summary>
    /// Helper class for showing current memory usage
    /// </summary>
    public static class MemoryDiagnosticsHelper
    {
        static Popup popup;
        static TextBlock currentMemoryKB;
        static TextBlock currentMemoryMB;
        static TextBlock peakMemoryBlock;
        static DispatcherTimer timer;
        static bool forceGc;
        const long MAX_MEMORY = 90 * 1024 * 1024; // 90MB, per marketplace
        static int lastSafetyBand = -1; // to avoid needless changes of colour

const long MAX_CHECKPOINTS = 10; // adjust as needed
static Queue<MemoryCheckpoint> recentCheckpoints;

static bool alreadyFailedPeak = false; // to avoid endless Asserts

        /// <summary>
        /// Starts the memory diagnostic timer and shows the counter
        /// </summary>
        /// <param name="timespan">The timespan between counter updates</param>
        /// <param name="forceGc">Whether or not to force a GC before collecting memory stats</param>
        [Conditional("DEBUG")]
        public static void Start(TimeSpan timespan, bool forceGc)
        {
            if (timer != null) throw new InvalidOperationException("Diagnostics already running");

MemoryDiagnosticsHelper.forceGc = forceGc;
recentCheckpoints = new Queue<MemoryCheckpoint>();

            StartTimer(timespan);
            ShowPopup();
        }

        /// <summary>
        /// Stops the timer and hides the counter
        /// </summary>
        [Conditional("DEBUG")]
        public static void Stop()
        {
            HidePopup();
            StopTimer();
            recentCheckpoints = null;
        }

        /// <summary>
        /// Add a checkpoint to the system to help diagnose failures. Ignored in retail mode
        /// </summary>
        /// <param name="text">Text to describe the most recent thing that happened</param>
        [Conditional("DEBUG")]
        public static void Checkpoint(string text)
        {
            if (recentCheckpoints == null) return;
            if (recentCheckpoints.Count >= MAX_CHECKPOINTS - 1) recentCheckpoints.Dequeue();
            recentCheckpoints.Enqueue(new MemoryCheckpoint(text, GetCurrentMemoryUsage()));
        }

        /// <summary>
        /// Recent checkpoints stored by the app; will always be empty in retail mode
        /// </summary>
        public static IEnumerable<MemoryCheckpoint> RecentCheckpoints
        {
            get
            {
                if (recentCheckpoints == null) yield break;

                foreach (MemoryCheckpoint checkpoint in recentCheckpoints) yield return checkpoint;
            }
        }

        /// <summary>
        /// Gets the current memory usage, in bytes. Returns zero in non-debug mode
        /// </summary>
        /// <returns>Current usage</returns>
        public static long GetCurrentMemoryUsage()
        {
#if DEBUG
            // don't use DeviceExtendedProperties for release builds (requires a capability)
            return (long)DeviceExtendedProperties.GetValue("ApplicationCurrentMemoryUsage");
#else
      return 0;
#endif
        }

/// <summary>
&

补充：移动开发 , Windows Phone ,