public static string Truncate(this string valueToTruncate, int startIndex = 0, int maxLength = 0
, TruncateOptions options = TruncateOptions.FinishWord)
{
if (valueToTruncate == null)
{
return("");
}
if (startIndex > 0 && startIndex < valueToTruncate.Length)
{
valueToTruncate = valueToTruncate.Substring(startIndex);
}
if (valueToTruncate.Length <= maxLength)
{
return(valueToTruncate);
}
bool includeEllipsis = (options & TruncateOptions.IncludeEllipsis) ==
TruncateOptions.IncludeEllipsis;
bool finishWord = (options & TruncateOptions.FinishWord) ==
TruncateOptions.FinishWord;
bool allowLastWordOverflow =
(options & TruncateOptions.AllowLastWordToGoOverMaxLength) ==
TruncateOptions.AllowLastWordToGoOverMaxLength;
string retValue = valueToTruncate;
if (includeEllipsis)
{
maxLength -= 1;
}
int lastSpaceIndex = retValue.LastIndexOf(" ",
maxLength, StringComparison.CurrentCultureIgnoreCase);
if (!finishWord)
{
retValue = retValue.Remove(maxLength);
}
else if (allowLastWordOverflow)
{
int spaceIndex = retValue.IndexOf(" ",
maxLength, StringComparison.CurrentCultureIgnoreCase);
if (spaceIndex != -1)
{
retValue = retValue.Remove(spaceIndex);
}
}
else if (lastSpaceIndex > -1)
{
retValue = retValue.Remove(lastSpaceIndex);
}
if (includeEllipsis && retValue.Length < valueToTruncate.Length)
{
retValue += "…";
}
return(retValue);
}
internal TruncateMessage Populate(
NpgsqlLogSequenceNumber walStart, NpgsqlLogSequenceNumber walEnd, DateTime serverClock, uint?transactionXid, TruncateOptions options,
ReadOnlyArrayBuffer <RelationMessage> relations)
{
base.Populate(walStart, walEnd, serverClock, transactionXid);
Options = options;
Relations = relations;
return(this);
}
internal TruncateMessage Populate(
NpgsqlLogSequenceNumber walStart, NpgsqlLogSequenceNumber walEnd, DateTime serverClock, TruncateOptions options,
uint[] relationIds)
{
base.Populate(walStart, walEnd, serverClock);
Options = options;
RelationIds = relationIds;
return(this);
}
public string TruncateString(string valueToTruncate, int maxLength, TruncateOptions options)
{
if (valueToTruncate == null)
{
return "";
}
if (valueToTruncate.Length <= maxLength)
{
return valueToTruncate;
}
bool includeEllipsis = (options & TruncateOptions.IncludeEllipsis) == TruncateOptions.IncludeEllipsis;
bool finishWord = (options & TruncateOptions.FinishWord) == TruncateOptions.FinishWord;
bool allowLastWordOverflow = (options & TruncateOptions.AllowLastWordToGoOverMaxLength) == TruncateOptions.AllowLastWordToGoOverMaxLength;
string retValue = valueToTruncate;
if (includeEllipsis)
{
maxLength -= 1;
}
int lastSpaceIndex = retValue.LastIndexOf(" ", maxLength, StringComparison.CurrentCultureIgnoreCase);
if (!finishWord)
{
retValue = retValue.Remove(maxLength);
}
else if (allowLastWordOverflow)
{
int spaceIndex = retValue.IndexOf(" ", maxLength, StringComparison.CurrentCultureIgnoreCase);
if (spaceIndex != -1)
{
retValue = retValue.Remove(spaceIndex);
}
}
else if (lastSpaceIndex > -1)
{
retValue = retValue.Remove(lastSpaceIndex);
}
if (includeEllipsis && retValue.Length < valueToTruncate.Length)
{
retValue += "...";
}
return retValue;
}
public static string TruncateString(string valueToTruncate, int maxLength, TruncateOptions options)
{
bool includeEllipsis = (options & TruncateOptions.IncludeEllipsis) ==
TruncateOptions.IncludeEllipsis;
bool finishWord = (options & TruncateOptions.FinishWord) ==
TruncateOptions.FinishWord;
bool allowLastWordOverflow =
(options & TruncateOptions.AllowLastWordToGoOverMaxLength) ==
TruncateOptions.AllowLastWordToGoOverMaxLength;
string retValue = valueToTruncate;
if (!finishWord)
{
if (retValue.Length < maxLength)
{
return(retValue);
}
else
{
retValue = retValue.Remove(maxLength);
String[] array = retValue.Split();
String valor = array[array.Length - 1];
return(retValue = retValue.Replace(valor, "..."));
}
}
else if (allowLastWordOverflow)
{
int spaceIndex = retValue.IndexOf(" ", maxLength,
StringComparison.CurrentCultureIgnoreCase);
if (spaceIndex != -1)
{
retValue = retValue.Remove(spaceIndex);
}
}
return(retValue);
}
/// <summary>
/// 截断字符串(可保留完整单词)
/// </summary>
/// <param name="valueToTruncate">需处理的字符串</param>
/// <param name="maxLength">字符数</param>
/// <param name="options">截断选项</param>
/// <returns></returns>
public static string TruncateString(this string valueToTruncate, int maxLength, TruncateOptions options)
{
if (valueToTruncate == null)
{
return("");
}
if (valueToTruncate.Length <= maxLength)
{
return(valueToTruncate);
}
var includeEllipsis = (options & TruncateOptions.IncludeEllipsis) ==
TruncateOptions.IncludeEllipsis;
var finishWord = (options & TruncateOptions.FinishWord) ==
TruncateOptions.FinishWord;
var allowLastWordOverflow =
(options & TruncateOptions.AllowLastWordToGoOverMaxLength) ==
TruncateOptions.AllowLastWordToGoOverMaxLength;
var retValue = valueToTruncate;
if (includeEllipsis)
{
maxLength -= 1;
}
var lastSpaceIndex = retValue.LastIndexOf(" ",
maxLength, StringComparison.CurrentCultureIgnoreCase);
if (!finishWord)
{
retValue = retValue.Remove(maxLength);
}
else if (allowLastWordOverflow)
{
var spaceIndex = retValue.IndexOf(" ",
maxLength, StringComparison.CurrentCultureIgnoreCase);
if (spaceIndex != -1)
{
retValue = retValue.Remove(spaceIndex);
}
}
else if (lastSpaceIndex > -1)
{
retValue = retValue.Remove(lastSpaceIndex);
}
if (includeEllipsis && retValue.Length < valueToTruncate.Length)
{
retValue += "...";
}
return(retValue);
}