有关字符比较（30分）

[savl]

对于下面代码字符串比较所耗的时间，谁能做详细一点的解释，看.net的帮助还是不明白。
Sub Main()
Const NUM_ITER As Integer = 10000000
Dim result As Integer

Dim str1 As String = "satisfaction"
Dim str2 As String = "satisfaction"
Dim startTime As Integer
Dim endTime As Integer
Dim count As Integer

startTime = Environment.TickCount
For count = 1 To NUM_ITER
result = String.Compare(str1, str2)
Next
endTime = Environment.TickCount
Console.WriteLine("Compare: " & CStr(endTime - startTime))
’结果是5148

startTime = Environment.TickCount
For count = 1 To NUM_ITER
result = str1.CompareTo(str2)
Next
endTime = Environment.TickCount
Console.WriteLine("CompareTo: " & CStr(endTime - startTime))
’结果是6479
startTime = Environment.TickCount
For count = 1 To NUM_ITER
result = String.CompareOrdinal(str1, str2)
Next
endTime = Environment.TickCount
Console.WriteLine("CompareOrdinal: " & CStr(endTime-startTime))
’结果是1212
startTime = Environment.TickCount
For count = 1 To NUM_ITER
result = str1.Equals(str2)
Next
endtime = Environment.TickCount
Console.WriteLine("Equals (instance): " & CStr(endTime-startTime))
’结果是971
startTime = Environment.TickCount
For count = 1 To NUM_ITER
result = String.Equals(str1, str2)
Next
endTime = Environment.TickCount
Console.WriteLine("Equals (shared): " & CStr(endTime-startTime))
’结果是270
End Sub

[fishsward]

强烈关注,帮你up

[lx1920]

你试试object的ReferenceEquals方法，这个应该是最快的。
object.ReferenceEquals(str1,str2)
参见ms-help://MS.NETFrameworkSDK.CHS/cpref/html/frlrfsystemobjectclassreferenceequalstopic.htm

[szch]

VB中不同的算法效率的确相差很大。

[savl]

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