//

        // 摘要:

        //     Concatenates the members of a collection, using the specified separator between

        //     each member.

        //

        // 参数:

        //   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.

        //

        // 类型参数:

        //   T:

        //     The type of the members of values.

        //

        // 返回结果:

        //     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.

        //

        // 异常:

        //   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.

        //

        // 参数:

        //   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.

        //

        // 返回结果:

        //     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.

        //

        // 异常:

        //   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.

        //

        // 参数:

        //   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.

        //

        // 返回结果:

        //     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.

        //

        // 异常:

        //   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.

        //

        // 参数:

        //   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.

        //

        // 返回结果:

        //     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.

        //

        // 异常:

        //   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.

        //

        // 参数:

        //   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.

        //

        // 返回结果:

        //     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.

        //

        // 异常:

        //   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);

        //

        // 参数:

        //   separator:

        //

        //   value:

        public static String Join(char separator, params String[] value);

        //

        // 参数:

        //   separator:

        //

        //   value:

        //

        //   startIndex:

        //

        //   count:

        public static String Join(char separator, String[] value, int startIndex, int count);

        //

        // 参数:

        //   separator:

        //

        //   values:

        public static String Join(char separator, params object[] values);

        //

        // 参数:

        //   separator:

        //

        //   values:

        //

        // 类型参数:

        //   T:

        public static String Join<T>(char separator, IEnumerable<T> values);