C#: (int)(num + .5F)
170
49
1479
59
VB: Convert.ToInt32(num)
1218
1232
6531
6517
VB: Fix(num + .5F)
3873
3677
18144
17955
Thus, by examining the release build results for the device, it can be concluded that on the current generation of devices it is most efficient to use casting in C# and Convert.ToInt32 in VB. In C#, casting proved to be over 106 times faster, whereas in VB, Convert.ToInt32 was nearly 3 times faster. //C#
float temp = 3.6f;
int rounded1 = (int)(temp + .5f);
int rounded2 = Convert.ToInt32(temp);
'VB
Dim temp As Single = 3.6F
Dim rounded1 As Integer = Fix(temp + .5F)
Dim rounded2 As Integer = Convert.ToInt32(temp)
7.41. Why does Control.Invoke take so long when a modal dialog is displayed?
There is a known bug with using Control.Invoke while a modal dialog is displayed through ShowDialog. Download the latest .NET Compact Framework Service Pack to fix this:
The latest platform updates and .NET Compact Framework service packs are available at:
http://msdn.microsoft.com/mobility/downloads/default.aspx
7.42. Is there a way to retrieve the culture information of an Assembly?
Culture information can be retrieved through Reflection: //C#
using System.Reflection;
using System.Globalization;
Assembly asm = Assembly.GetExecutingAssembly();
CultureInfo ci = asm.GetName().CultureInfo;
'VB
Imports System.Reflection
Imports System.Globalization
Dim asm As Assembly = Assembly.GetExecutingAssembly()
Dim ci As CultureInfo = asm.GetName().CultureInfo
8.通讯和Web服务
8.1. 如何通过TCP Socket向桌面机发送数据?
请查看本问答的"10.5. 写一个捕捉Pocket PC签名的程序. " 部分。
8.2. 为什么不能访问本机上的Web服务?
不要在设备上使用localhost来引用Web服务,因为对于设备来说localhost就是运行应用程序所在的设备,就是设备它本身。您应该使用机器名或IP地址来引用Web服务。
8.3. 如何在微软.net精简框架上调用Web服务
这篇文章向您演示了如何从智能设备上,通过.net精简框架同步和异步调用Web服务:
http://msdn.microsoft.com/library/en-us/dnnetcomp/html/netcfwebservices.asp
8.4. 如何通过代理服务器提交HTTP GET申请?
通过或不通过特定的代理服务器提交HTTP GET请求。
使用StreamReader读取返回的HTML,并转成字符数组。然后把返回的值显示在ListBox中,如以下的屏幕截图所示:
http://samples.gotdotnet.com/quickstart/CompactFramework/doc/httpgetwithproxy.aspx
8.5. 如何使用Web服务?
这篇快速入门教程,描述了如何使用提供了简单数学计算的Web服务(这个数学计算的Web服务在.net框架的快速入门中有说明,标题是"Write a Simple Web service,")。这个快速入门教程提供了一个Web服务的客户端应用:
http://samples.gotdotnet.com/quickstart/CompactFramework/doc/xmlwebservice.aspx
8.6. 如何使用MapPoint3.0得到地图?
这篇快速入门描述了如何使用MapPoint的Web服务,编程实现在PocketPC上获得特定位置的程序,如以下屏幕截图所示:
http://samples.gotdotnet.com/quickstart/CompactFramework/doc/mappointfindmap.aspx