最近在ArcEngine中写了一个唯一值专题图的程序，运行之后却发现了一个奇怪的问题。在IUniqueVlaueRender中添加的字段是一个double类型的字段，都设置好后发现，在Toccontrol中每一个值都添加进去了，但是在MapControl中对象却都没有显示。但是很奇怪的是，唯有一个对象的值是0的，能够正常显示，其他的处于0-1的值都无法显示。
起初怀疑是不是ArcGIS中的Scale设置的只是显示小数点位数，实际上存储的还是超过了6位小数点，到处找也没找到相关的资料，遂放弃。然后回到arcMap中，尝试不同的工具。使用Identify工具，查看到某对象的值是0.256903，然后使用这个值去到Find工具里去找，竟然没找到。。
观察了一下，Identify中显示的值是“.256903”，更换了一个值之后，再回到Find里找“.256903”，找到了。回到AE中，将IUniqueValueRender中SetValue时所有的值介于-1 - +1之间的小数的0都trim掉，一切就好了。
到此，清楚了，原来是系统的零起始设置（控制面板，区域和语言，其他设置，零起始显示）的问题。像上文一样更改了之后，当然可以解决问题。但是假如某台电脑的设置是0起始显示设置为带零的呢？又得重新设置。所以此处需要获取系统中的是否显示起始零的设置，然后更改程序中的值。
获得“零起始显示”需要调用系统API，方法如下：
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern int GetLocaleInfoEx(String lpLocaleName, LCTYPE LCType, StringBuilder lpLCData, int cchData);
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern int GetUserDefaultLocaleName(StringBuilder lpLocaleName, int cchLocaleName);
public enum LCTYPE : uint
{
LOCALE_NOUSEROVERRIDE = 0x80000000, // do not use user overrides
LOCALE_RETURN_NUMBER = 0x20000000, // return number instead of string
// Modifier for genitive names
LOCALE_RETURN_GENITIVE_NAMES = 0x10000000, //Flag to return the Genitive forms of month names
//
// The following LCTypes are mutually exclusive in that they may NOT
// be used in combination with each other.
//
//
// These are the various forms of the name of the locale:
//
LOCALE_SLOCALIZEDDISPLAYNAME = 0x00000002, // localized name of locale, eg "German (Germany)" in UI language
LOCALE_SENGLISHDISPLAYNAME = 0x00000072, // Display name (language + country usually) in English, eg "German (Germany)"
LOCALE_SNATIVEDISPLAYNAME = 0x00000073, // Display name in native locale language, eg "Deutsch (Deutschland)
LOCALE_SLOCALIZEDLANGUAGENAME = 0x0000006f, // Language Display Name for a language, eg "German" in UI language
LOCALE_SENGLISHLANGUAGENAME = 0x00001001, // English name of language, eg "German"
LOCALE_SNATIVELANGUAGENAME = 0x00000004, // native name of language, eg "Deutsch"
LOCALE_SLOCALIZEDCOUNTRYNAME = 0x00000006, // localized name of country, eg "Germany" in UI language
LOCALE_SENGLISHCOUNTRYNAME = 0x00001002, // English name of country, eg "Germany"
LOCALE_SNATIVECOUNTRYNAME = 0x00000008, // native name of country, eg "Deutschland"
// Additional LCTYPEs
LOCALE_SABBREVLANGNAME = 0x00000003, // abbreviated language name
LOCALE_ICOUNTRY = 0x00000005, // country code
LOCALE_SABBREVCTRYNAME = 0x00000007, // abbreviated country name
LOCALE_IGEOID = 0x0000005B, // geographical location id
LOCALE_IDEFAULTLANGUAGE = 0x00000009, // default language id
LOCALE_IDEFAULTCOUNTRY = 0x0000000A, // default country code
LOCALE_IDEFAULTCODEPAGE = 0x0000000B, // default oem code page
LOCALE_IDEFAULTANSICODEPAGE = 0x00001004, // default ansi code page
LOCALE_IDEFAULTMACCODEPAGE = 0x00001011, // default mac code page
LOCALE_SLIST = 0x0000000C, // list item separator
LOCALE_IMEASURE = 0x0000000D, // 0 = metric, 1 = US
LOCALE_SDECIMAL = 0x0000000E, // decimal separator
LOCALE_STHOUSAND = 0x0000000F, // thousand separator
LOCALE_SGROUPING = 0x00000010, // digit grouping
LOCALE_IDIGITS = 0x00000011, // number of fractional digits
LOCALE_ILZERO = 0x00000012, // leading zeros for decimal
LOCALE_INEGNUMBER = 0x00001010, // negative number mode
LOCALE_SNATIVEDIGITS = 0x00000013, // native digits for 0-9
LOCALE_SCURRENCY = 0x00000014, // local monetary symbol
LOCALE_SINTLSYMBOL = 0x00000015, // uintl monetary symbol
LOCALE_SMONDECIMALSEP = 0x00000016, // monetary decimal separator
LOCALE_SMONTHOUSANDSEP = 0x00000017, // monetary thousand separator
LOCALE_SMONGROUPING = 0x00000018, // monetary grouping
LOCALE_ICURRDIGITS = 0x00000019, // # local monetary digits
LOCALE_IINTLCURRDIGITS = 0x0000001A, // # uintl monetary digits
LOCALE_ICURRENCY = 0x0000001B, // positive currency mode
LOCALE_INEGCURR = 0x0000001C, // negative currency mode
LOCALE_SDATE = 0x0000001D, // date separator (derived from LOCALE_SSHORTDATE, use that instead)
LOCALE_STIME = 0x0000001E, // time separator (derived from LOCALE_STIMEFORMAT, use that instead)
LOCALE_SSHORTDATE = 0x0000001F, // short date format string
LOCALE_SLONGDATE = 0x00000020, // long date format string
LOCALE_STIMEFORMAT = 0x00001003, // time format string
LOCALE_IDATE = 0x00000021, // short date format ordering (derived from LOCALE_SSHORTDATE, use that instead)
LOCALE_ILDATE = 0x00000022, // long date format ordering (derived from LOCALE_SLONGDATE, use that instead)
LOCALE_ITIME = 0x00000023, // time format specifier (derived from LOCALE_STIMEFORMAT, use that instead)
LOCALE_ITIMEMARKPOSN = 0x00001005, // time marker position (derived from LOCALE_STIMEFORMAT, use that instead)
LOCALE_ICENTURY = 0x00000024, // century format specifier (short date, LOCALE_SSHORTDATE is preferred)
LOCALE_ITLZERO = 0x00000025, // leading zeros in time field (derived from LOCALE_STIMEFORMAT, use that instead)
LOCALE_IDAYLZERO = 0x00000026, // leading zeros in day field (short date, LOCALE_SSHORTDATE is preferred)
LOCALE_IMONLZERO = 0x00000027, // leading zeros in month field (short date, LOCALE_SSHORTDATE is preferred)
LOCALE_S1159 = 0x00000028, // AM designator
LOCALE_S2359 = 0x00000029, // PM designator
LOCALE_ICALENDARTYPE = 0x00001009, // type of calendar specifier
LOCALE_IOPTIONALCALENDAR = 0x0000100B, // additional calendar types specifier
LOCALE_IFIRSTDAYOFWEEK = 0x0000100C, // first day of week specifier
LOCALE_IFIRSTWEEKOFYEAR = 0x0000100D, // first week of year specifier
LOCALE_SDAYNAME1 = 0x0000002A, // long name for Monday
LOCALE_SDAYNAME2 = 0x0000002B, // long name for Tuesday
LOCALE_SDAYNAME3 = 0x0000002C, // long name for Wednesday
LOCALE_SDAYNAME4 = 0x0000002D, // long name for Thursday
LOCALE_SDAYNAME5 = 0x0000002E, // long name for Friday
LOCALE_SDAYNAME6 = 0x0000002F, // long name for Saturday
LOCALE_SDAYNAME7 = 0x00000030, // long name for Sunday
LOCALE_SABBREVDAYNAME1 = 0x00000031, // abbreviated name for Monday
LOCALE_SABBREVDAYNAME2 = 0x00000032, // abbreviated name for Tuesday
LOCALE_SABBREVDAYNAME3 = 0x00000033, // abbreviated name for Wednesday
LOCALE_SABBREVDAYNAME4 = 0x00000034, // abbreviated name for Thursday
LOCALE_SABBREVDAYNAME5 = 0x00000035, // abbreviated name for Friday
LOCALE_SABBREVDAYNAME6 = 0x00000036, // abbreviated name for Saturday
LOCALE_SABBREVDAYNAME7 = 0x00000037, // abbreviated name for Sunday
LOCALE_SMONTHNAME1 = 0x00000038, // long name for January
LOCALE_SMONTHNAME2 = 0x00000039, // long name for February
LOCALE_SMONTHNAME3 = 0x0000003A, // long name for March
LOCALE_SMONTHNAME4 = 0x0000003B, // long name for April
LOCALE_SMONTHNAME5 = 0x0000003C, // long name for May
LOCALE_SMONTHNAME6 = 0x0000003D, // long name for June
LOCALE_SMONTHNAME7 = 0x0000003E, // long name for July
LOCALE_SMONTHNAME8 = 0x0000003F, // long name for August
LOCALE_SMONTHNAME9 = 0x00000040, // long name for September
LOCALE_SMONTHNAME10 = 0x00000041, // long name for October
LOCALE_SMONTHNAME11 = 0x00000042, // long name for November
LOCALE_SMONTHNAME12 = 0x00000043, // long name for December
LOCALE_SMONTHNAME13 = 0x0000100E, // long name for 13th month (if exists)
LOCALE_SABBREVMONTHNAME1 = 0x00000044, // abbreviated name for January
LOCALE_SABBREVMONTHNAME2 = 0x00000045, // abbreviated name for February
LOCALE_SABBREVMONTHNAME3 = 0x00000046, // abbreviated name for March
LOCALE_SABBREVMONTHNAME4 = 0x00000047, // abbreviated name for April
LOCALE_SABBREVMONTHNAME5 = 0x00000048, // abbreviated name for May
LOCALE_SABBREVMONTHNAME6 = 0x00000049, // abbreviated name for June
LOCALE_SABBREVMONTHNAME7 = 0x0000004A, // abbreviated name for July
LOCALE_SABBREVMONTHNAME8 = 0x0000004B, // abbreviated name for August
LOCALE_SABBREVMONTHNAME9 = 0x0000004C, // abbreviated name for September
LOCALE_SABBREVMONTHNAME10 = 0x0000004D, // abbreviated name for October
LOCALE_SABBREVMONTHNAME11 = 0x0000004E, // abbreviated name for November
LOCALE_SABBREVMONTHNAME12 = 0x0000004F, // abbreviated name for December
LOCALE_SABBREVMONTHNAME13 = 0x0000100F, // abbreviated name for 13th month (if exists)
LOCALE_SPOSITIVESIGN = 0x00000050, // positive sign
LOCALE_SNEGATIVESIGN = 0x00000051, // negative sign
LOCALE_IPOSSIGNPOSN = 0x00000052, // positive sign position (derived from INEGCURR)
LOCALE_INEGSIGNPOSN = 0x00000053, // negative sign position (derived from INEGCURR)
LOCALE_IPOSSYMPRECEDES = 0x00000054, // mon sym precedes pos amt (derived from ICURRENCY)
LOCALE_IPOSSEPBYSPACE = 0x00000055, // mon sym sep by space from pos amt (derived from ICURRENCY)
LOCALE_INEGSYMPRECEDES = 0x00000056, // mon sym precedes neg amt (derived from INEGCURR)
LOCALE_INEGSEPBYSPACE = 0x00000057, // mon sym sep by space from neg amt (derived from INEGCURR)
LOCALE_FONTSIGNATURE = 0x00000058, // font signature
LOCALE_SISO639LANGNAME = 0x00000059, // ISO abbreviated language name
LOCALE_SISO3166CTRYNAME = 0x0000005A, // ISO abbreviated country name
LOCALE_IDEFAULTEBCDICCODEPAGE = 0x00001012, // default ebcdic code page
LOCALE_IPAPERSIZE = 0x0000100A, // 1 = letter, 5 = legal, 8 = a3, 9 = a4
LOCALE_SENGCURRNAME = 0x00001007, // english name of currency
LOCALE_SNATIVECURRNAME = 0x00001008, // native name of currency
LOCALE_SYEARMONTH = 0x00001006, // year month format string
LOCALE_SSORTNAME = 0x00001013, // sort name
LOCALE_IDIGITSUBSTITUTION = 0x00001014, // 0 = context, 1 = none, 2 = national
LOCALE_SNAME = 0x0000005c, // locale name (with sort info) (ie: de-DE_phoneb)
LOCALE_SDURATION = 0x0000005d, // time duration format
LOCALE_SKEYBOARDSTOINSTALL = 0x0000005e, // (windows only) keyboards to install
LOCALE_SSHORTESTDAYNAME1 = 0x00000060, // Shortest day name for Monday
LOCALE_SSHORTESTDAYNAME2 = 0x00000061, // Shortest day name for Tuesday
LOCALE_SSHORTESTDAYNAME3 = 0x00000062, // Shortest day name for Wednesday
LOCALE_SSHORTESTDAYNAME4 = 0x00000063, // Shortest day name for Thursday
LOCALE_SSHORTESTDAYNAME5 = 0x00000064, // Shortest day name for Friday
LOCALE_SSHORTESTDAYNAME6 = 0x00000065, // Shortest day name for Saturday
LOCALE_SSHORTESTDAYNAME7 = 0x00000066, // Shortest day name for Sunday
LOCALE_SISO639LANGNAME2 = 0x00000067, // 3 character ISO abbreviated language name
LOCALE_SISO3166CTRYNAME2 = 0x00000068, // 3 character ISO country name
LOCALE_SNAN = 0x00000069, // Not a Number
LOCALE_SPOSINFINITY = 0x0000006a, // + Infinity
LOCALE_SNEGINFINITY = 0x0000006b, // - Infinity
LOCALE_SSCRIPTS = 0x0000006c, // Typical scripts in the locale
LOCALE_SPARENT = 0x0000006d, // Fallback name for resources
LOCALE_SCONSOLEFALLBACKNAME = 0x0000006e, // Fallback name for within the console
}
/// <summary>
/// 获取系统当前的是否显示前导零设置
/// </summary>
/// <returns>0:不显示前导0 1：显示前导0</returns>
public int getIfShowLeadingZero()
{
StringBuilder lpLCData = new StringBuilder(10);
StringBuilder localeName = new StringBuilder(20);
GetUserDefaultLocaleName(localeName, 20);
GetLocaleInfoEx(localeName.ToString(), LCTYPE.LOCALE_ILZERO, lpLCData, 10);
return Convert.ToInt32(lpLCData.ToString());
}
在设置IUNiqueValueRender的值时，如果值在-1 - +1之间，若显示前导0（getIfShowLeadingZero()==1），
则不予处理；否则（getIfShowLeadingZero()==0）将前导的“0.”替换为“.”。
其他处理方式不变。
问题是解决了，但系统中的“起始零显示”难道不应该只是影响数据的显示么？在此怎么影响到数据的查询了？
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