【正文】 on all of the devices, and then customize for devicespecific features when they are detected.　　? Create modular code to allow easy module removal from executables. This covers cases where separate smaller executable files are required due to device memorysize constraints.　　決定設(shè)備策略時(shí)，考慮以指方針：　　?從屏幕方向，網(wǎng)絡(luò)帶寬，存，處理器性能其硬參數(shù)等方面您設(shè)備進(jìn)行應(yīng)程序優(yōu)化。?異常發(fā)生，應(yīng)程序能夠恢復(fù)個(gè)已知常狀態(tài)。當(dāng)設(shè)備被設(shè)計(jì)個(gè)基礎(chǔ)架構(gòu)部分時(shí)，那么基礎(chǔ)架構(gòu)這層追蹤部分設(shè)備活動(dòng)?！　?設(shè)備數(shù)據(jù)庫日志服務(wù)器數(shù)據(jù)庫保持同步，以維持服務(wù)器端審核能力。有些比較容易，有些難度比較?！　?研究并利工具幫助移植工作。Power　　Power is the most limiting factor for a mobile device. All design decisions should at take into account how much power the device consumes and its effect on overall battery life. If you have a choice in devices, consider devices that can draw power from Universal Serial Bus (USB) or other types of data hookups. Research munication protocols for their power consumption.　　Consider the following guidelines when designing for power consumption:　　? To conserve battery life, do not update the UI while the application is in the background.　　? Choose munication methods considering both power usage as well as network speed.　　? Consider deferring nonessential wireless munications until the device is under external power.　　? Implement power profiles to increase performance when the device is plugged into external power and not charging its battery.　　? Design so that parts of the devices can be powered down when not in use, or when not required. Common examples are screen backlighting, hard drives, GPS functions, speakers, and wireless munications.　　? Design services and munications to transfer the smallest number of bytes possible over the air. Choose protocols, design service interfaces, and batch munications with this goal in mind.　　? If you are considering using the 3G hardware munications protocol, consider that while it is significantly faster, it also currently uses much more power than its predecessors, such as the Edge protocol. When you are using 3G, be sure to municate in batched bursts and to shut down munication at times when it is not needed.功耗　　于個(gè)移動(dòng)設(shè)備說，電量最受制約個(gè)因素?！　?設(shè)備不使或不需時(shí)，能夠使得設(shè)備部分停止工作。　　Synchronization　　Consider whether you want to support overtheair synchronization, cradled synchronization, or both. Because synchronization will often involve sensitive data, consider how to secure your synchronization data, especially when synchronizing over the air. Design your synchronization to handle connection interruptions gracefully, either by canceling the operation or by allowing it to resume when a connection bees available. Merge replication allows both uploadonly and bidirectional synchronization and is a good choice for infrastructures utilizing newer versions of SQL Server. Consider the Microsoft Sync Framework as it can provide robust synchronization services in a wide variety of situations.Consider the following guidelines when designing synchronization:　　? Design for recovery when synchronization is reset, and decide how to manage synchronization conflicts.　　? If you must support bidirectional synchronization to SQL Server, consider using merge replication synchronization. Remember that merge synchronization will synchronize all of the data in the merge set, which may require additional network bandwidth and can impact performance.　　? If your users must synchronize data when away from the office, consider including overtheair synchronization in your design.　　? If your users will be synchronizing with a host PC, consider including cradled synchronization in your design.　　? Consider storeandforward synchronization using WCF ?！　?考慮推遲不必?zé)o線通信，直設(shè)備由部供電時(shí)才進(jìn)行。移動(dòng)所支持API、存UI都不樣?！　?如果移植個(gè)富Internet應(yīng)客戶端，那么就好好研究，哪些代碼以不加修改，就移植過?！　orting　　Developers often want to port part or all of an existing application to a mobile device. Certain types of applications will be easier to port than others, and it is unlikely that you will be able to port the code directly without modification.　　Consider the following guidelines when designing to port your existing application to a mobile device:　　? If you are porting a rich client application from the desktop, rewrite the application in its entirety. Rich clients are rarely designed to suit a small screen size and limited memory and disk resources.　　? If you are porting a Web application to a mobile device, consider rewriting the UI for the smaller screen size. Also, consider munication limitations and interface chattiness as these can translate into increased power usage and connection costs for the user.　　? If you are porting an RIA client, research details to discover which code will port without modification. Consult the technology considerations section of this chapter for specific advice.　　? Research and utilize tools to assist in porting. For example, JavatoC++ convertors are available. When converting from Smartphone to Pocket PC code, Microsoft Visual Studio174。需注意，OpenNetCF基于XML，比簡(jiǎn)單二進(jìn)制日志模型占更存儲(chǔ)空間。 for example, attempted intrusion into the device. When devices are designed to be a part of a larger infrastructure, choose to track most device activity at the infrastructure level. Generally, auditing is considered most authoritative if the audits are generated at the precise time of resource access, and by the same routines that access the resource. Consider the fact that some of the logs might have to be generated on the device and must be synchronized with the server during periods of network connectivity.　　日志　　由于移動(dòng)設(shè)備存限制，應(yīng)該只必須做日志記錄?！　xception Management　　Designing an effective exceptionmanagement strategy is important for the security and reliability of your application. Good exception handling in your mobile application prevents sensitive exception details from being revealed to the user, improves application robustness, and helps to avoid your application being left in an inconsistent state in the event of an error.　　Consider the following guidelines when designing for exception management:　　? Design your application to recov