对于我的应用程序目前P自然排序/调用一个在SHLWAPI.DLL称为StrCmpLogicalW功能。 我在想尝试运行我在Mono下的应用程序,但随后我当然不能有这种的P / Invoke的东西(据我反正知道)。
是否有可能看到某个方法的实现,或者是有一个良好的,清洁高效的C#代码片段其做同样的事情?
我的代码目前看起来是这样的:
[SuppressUnmanagedCodeSecurity]
internal static class SafeNativeMethods
{
[DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
public static extern int StrCmpLogicalW(string psz1, string psz2);
}
public class NaturalStringComparer : IComparer<string>
{
private readonly int modifier = 1;
public NaturalStringComparer() : this(false) {}
public NaturalStringComparer(bool descending)
{
if (descending) modifier = -1;
}
public int Compare(string a, string b)
{
return SafeNativeMethods.StrCmpLogicalW(a ?? "", b ?? "") * modifier;
}
}
那么,是什么我要找的是不使用外部函数上面的类的替代品。
我刚刚实施了C#自然字符串比较,也许有人会发现它有用:
public class NaturalComparer : IComparer<string>
{
public int Compare(string x, string y)
{
if (x == null && y == null) return 0;
if (x == null) return -1;
if (y == null) return 1;
int lx = x.Length, ly = y.Length;
for (int mx = 0, my = 0; mx < lx && my < ly; mx++, my++)
{
if (char.IsDigit(x[mx]) && char.IsDigit(y[my]))
{
long vx = 0, vy = 0;
for (; mx < lx && char.IsDigit(x[mx]); mx++)
vx = vx * 10 + x[mx] - '0';
for (; my < ly && char.IsDigit(y[my]); my++)
vy = vy * 10 + y[my] - '0';
if (vx != vy)
return vx > vy ? 1 : -1;
}
if (mx < lx && my < ly && x[mx] != y[my])
return x[mx] > y[my] ? 1 : -1;
}
return lx - ly;
}
}
http://www.interact-sw.co.uk/iangblog/2007/12/13/natural-sorting似乎是你在找什么。
(没有,没有管理等同于StrCmpLogicalW内置.NET)
我用正则表达式来删除特殊字符。 然后铸造为int。 然后我比较整数。
输入:
列表输入=新列表{ “6.04”, “6.01”, “6.03”, “6#04”};
预期输出:
6.01
6.03
6.04
6#04
var output = input.OrderBy(s => s, new NaturalStringComparer());
foreach (var sort in output)
{
Console.WriteLine(sort);
}
public struct NaturalStringComparer : IComparer
{
public int Compare(string x, string y)
{
if (x == null && y == null) return 0;
if (x == null) return -1;
if (y == null) return 1;
int lx = x.Length, ly = y.Length;
int a = int.Parse(System.Text.RegularExpressions.Regex.Replace(x, @"\D+", ""));
int b = int.Parse(System.Text.RegularExpressions.Regex.Replace(y, @"\D+", ""));
return a.CompareTo(b);
}
}
如果你在Windows XP或更新版本上运行,你可以的PInvoke到shell功能StrCmpLogicalW:
public static int StrCmpLogical(String s1, String s2)
{
if (String.IsNullOrEmpty(s1) && !String.IsNullOrEmpty(s2))
return 1; //empty s1 comes after s2
else if (String.IsNullOrEmpty(s2) && !String.IsNullOrEmpty(s1))
return -1; //non-empty string comes before empty
return SafeNativeMethods.StrCmpLogicalW(s1, s2);
}
然后内部安全的类:
/// <summary>
/// This class suppresses stack walks for unmanaged code permission.
/// (System.Security.SuppressUnmanagedCodeSecurityAttribute is applied to this class.)
/// This class is for methods that are safe for anyone to call.
/// Callers of these methods are not required to perform a full security review to make sure that the
/// usage is secure because the methods are harmless for any caller.
/// </summary>
[SuppressUnmanagedCodeSecurity]
internal static class SafeNativeMethods
{
[DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
internal static extern Int32 StrCmpLogicalW(string psz1, string psz2);
}