C# string.join

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String.Join 方法 

平常工作中經常用到string.join（）方法，在vs 2017用的運行時（System.Runtime, Version=4.2.0.0）中，共有九個（重載）方法。

//        // 摘要:        //     Concatenates the members of a collection, using the specified separator between        //     each member.        //        // 參數:        //   separator:        //     The string to use as a separator.separator is included in the returned string        //     only if values has more than one element.        //        //   values:        //     A collection that contains the objects to concatenate.        //        // 型別參數:        //   T:        //     The type of the members of values.        //        // 返回結果:        //     A string that consists of the members of values delimited by the separator string.        //     If values has no members, the method returns System.String.Empty.        //        // 異常:        //   T:System.ArgumentNullException:        //     values is null.        public static String Join<T>(String separator, IEnumerable<T> values);        //        // 摘要:        //     Concatenates the members of a constructed System.Collections.Generic.IEnumerable`1        //     collection of type System.String, using the specified separator between each        //     member.        //        // 參數:        //   separator:        //     The string to use as a separator.separator is included in the returned string        //     only if values has more than one element.        //        //   values:        //     A collection that contains the strings to concatenate.        //        // 返回結果:        //     A string that consists of the members of values delimited by the separator string.        //     If values has no members, the method returns System.String.Empty.        //        // 異常:        //   T:System.ArgumentNullException:        //     values is null.        public static String Join(String separator, IEnumerable<String> values);        //        // 摘要:        //     Concatenates the elements of an object array, using the specified separator between        //     each element.        //        // 參數:        //   separator:        //     The string to use as a separator. separator is included in the returned string        //     only if values has more than one element.        //        //   values:        //     An array that contains the elements to concatenate.        //        // 返回結果:        //     A string that consists of the elements of values delimited by the separator string.        //     If values is an empty array, the method returns System.String.Empty.        //        // 異常:        //   T:System.ArgumentNullException:        //     values is null.        public static String Join(String separator, params object[] values);        //        // 摘要:        //     Concatenates all the elements of a string array, using the specified separator        //     between each element.        //        // 參數:        //   separator:        //     The string to use as a separator. separator is included in the returned string        //     only if value has more than one element.        //        //   value:        //     An array that contains the elements to concatenate.        //        // 返回結果:        //     A string that consists of the elements in value delimited by the separator string.        //     If value is an empty array, the method returns System.String.Empty.        //        // 異常:        //   T:System.ArgumentNullException:        //     value is null.        public static String Join(String separator, params String[] value);        //        // 摘要:        //     Concatenates the specified elements of a string array, using the specified separator        //     between each element.        //        // 參數:        //   separator:        //     The string to use as a separator. separator is included in the returned string        //     only if value has more than one element.        //        //   value:        //     An array that contains the elements to concatenate.        //        //   startIndex:        //     The first element in value to use.        //        //   count:        //     The number of elements of value to use.        //        // 返回結果:        //     A string that consists of the strings in value delimited by the separator string.        //     -or- System.String.Empty if count is zero, value has no elements, or separator        //     and all the elements of value are System.String.Empty.        //        // 異常:        //   T:System.ArgumentNullException:        //     value is null.        //        //   T:System.ArgumentOutOfRangeException:        //     startIndex or count is less than 0. -or- startIndex plus count is greater than        //     the number of elements in value.        //        //   T:System.OutOfMemoryException:        //     Out of memory.        public static String Join(String separator, String[] value, int startIndex, int count);        //        // 參數:        //   separator:        //        //   value:        public static String Join(char separator, params String[] value);        //        // 參數:        //   separator:        //        //   value:        //        //   startIndex:        //        //   count:        public static String Join(char separator, String[] value, int startIndex, int count);        //        // 參數:        //   separator:        //        //   values:        public static String Join(char separator, params object[] values);        //        // 參數:        //   separator:        //        //   values:        //        // 型別參數:        //   T:        public static String Join<T>(char separator, IEnumerable<T> values);

string.Join 重載方法詳解

所以平常寫方法的時候，基本上都覆蓋了。

常用方法：separator以“,”為例。

string.Join(‘,‘,string[]) 　　//字元‘,‘分割，拼接字串數組

string.Join(‘,‘,List<string>)　　//字元‘,‘分割，拼接字串列表　　

string.Join(",",string[]) 　　//字串“,”分割，拼接字元數組

string.Join(",",List<string>)　　//字串“,”分割，拼接字元數組

 

備忘：vs2013中重載方法沒有這麼多，需注意。

C# string.join