TimeSpan::TryParseExact Method (String, array<String>, IFormatProvider, TimeSpanStyles, TimeSpan%)
Converts the specified string representation of a time interval to its TimeSpan equivalent by using the specified formats, culture-specific format information, and styles, and returns a value that indicates whether the conversion succeeded. The format of the string representation must match one of the specified formats exactly.
Assembly: mscorlib (in mscorlib.dll)
public: static bool TryParseExact( String^ input, array<String^>^ formats, IFormatProvider^ formatProvider, TimeSpanStyles styles, [OutAttribute] TimeSpan% result )
- Type: System::String
A string that specifies the time interval to convert.
- Type: array<System::String>
A array of standard or custom format strings that define the acceptable formats of input.
- Type: System::IFormatProvider
An object that supplies culture-specific formatting information.
- Type: System.Globalization::TimeSpanStyles
One or more enumeration values that indicate the style of input.
Return ValueType: System::Boolean
true if input was converted successfully; otherwise, false.
The method parses the string representation of a time interval, which must be in the format defined by one of the format strings specified by the formats parameter, except that leading and trailing white-space characters are ignored. This method is similar to the ParseExact(String, array<String>, IFormatProvider, TimeSpanStyles) method, except that it does not throw an exception if the conversion fails.
The formats parameter is a string array whose elements consist of either a single standard format specifier, or one or more custom format specifiers that define the required format of input. For more information about valid format strings, see Standard TimeSpan Format Strings and Custom TimeSpan Format Strings. input must correspond exactly to a member of formats for the parse operation to succeed. The parse operation attempts to match input to each element in formats starting with the first element in the array.
The ParseExact method uses the conventions of the culture specified by the formatProvider parameter only if the format string used to parse input is a standard TimeSpan format string whose value is either "g" or "G". The "c", "t", and "T" standard format strings use the formatting conventions of the invariant culture. Custom format strings define the precise format of the input string and use literal characters to separate the components of a time interval.
The formatProvider parameter is an IFormatProvider implementation that provides culture-specific information about the format of the returned string if the format string used to parse input is a standard format string. The formatProvider parameter can be any of the following:
A CultureInfo object that represents the culture whose formatting conventions are to be reflected in the returned string. The DateTimeFormatInfo object returned by the CultureInfo::DateTimeFormat property defines the formatting of the returned string.
A DateTimeFormatInfo object that defines the formatting of the returned string.
If formatProvider is nullptr, the DateTimeFormatInfo object that is associated with the current culture is used.
The styles parameter affects the interpretation of strings that are parsed using custom format strings. It determines whether input is interpreted as a negative time interval only if a negative sign is present (TimeSpanStyles::None), or whether it is always interpreted as a negative time interval (TimeSpanStyles::AssumeNegative). If TimeSpanStyles::AssumeNegative is not used, format must include a literal negative sign symbol (such as "\-") to successfully parse a negative time interval.
The following example calls the method to convert each element of a string array to a TimeSpan value. The strings can represent a time interval in either the general short format or the general long format.
In addition, the example changes the way in which the time interval parsing methods interpret a single digit. Ordinarily, a single digit is interpreted as the number of days in a time interval. Instead, the %h custom format string is used to interpret a single digit as the number of hours. For this change to be effective, note that the %h custom format string must precede the other format strings in the formats array. Also note from the output that the TimeSpanStyles::AssumeNegative flag specified in the method call is used only when parsing a string with this format specifier.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.