微软.net精简框架常见问题及回答(中文版)(73)

C#: (int)(num + .5F)

170

1479

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()