@@ -144,6 +144,86 @@ public static int IndexOf<T>(this IEnumerable<T> s, IReadOnlyList<T> t, int star
144144
145145 #endregion
146146
147+ #region string (IndexOf)
148+ 149+ /// <summary>
150+ /// Reports the zero-based index of the first occurrence of the specified collection in this instance.
151+ /// </summary>
152+ /// <param name="s">The current collection.</param>
153+ /// <param name="t">The collection to seek.</param>
154+ /// <returns>
155+ /// The zero-based index position of value if <paramref name="t"/> is found, or -1 if it is not.
156+ /// If <paramref name="t"/> is empty, the return value is 0.
157+ /// </returns>
158+ /// <exception cref="ArgumentNullException"><paramref name="s"/> or <paramref name="t"/> is null.</exception>
159+ public static int IndexOf ( this IEnumerable < char > s , string t )
160+ {
161+ return s . IndexOf ( t , 0 , EqualityComparer < char > . Default ) ;
162+ }
163+ 164+ /// <summary>
165+ /// Reports the zero-based index of the first occurrence of the specified collection in this instance
166+ /// and uses the specified <see cref="IEqualityComparer{T}"/>.
167+ /// </summary>
168+ /// <param name="s">The current collection.</param>
169+ /// <param name="t">The collection to seek.</param>
170+ /// <param name="comparer">The specified <see cref="IEqualityComparer{T}"/> instance.</param>
171+ /// <returns>
172+ /// The zero-based index position of value if <paramref name="t"/> is found, or -1 if it is not.
173+ /// If <paramref name="t"/> is empty, the return value is 0.
174+ /// </returns>
175+ /// <exception cref="ArgumentNullException"><paramref name="s"/> or <paramref name="t"/> is null.</exception>
176+ public static int IndexOf ( this IEnumerable < char > s , string t , IEqualityComparer < char > comparer )
177+ {
178+ return s . IndexOf ( t , 0 , comparer ) ;
179+ }
180+ 181+ /// <summary>
182+ /// Reports the zero-based index of the first occurrence of the specified collection in this instance.
183+ /// The search starts at a specified position.
184+ /// </summary>
185+ /// <param name="s">The current collection.</param>
186+ /// <param name="t">The collection to seek.</param>
187+ /// <param name="startIndex">The search starting position.</param>
188+ /// <returns>
189+ /// The zero-based index position of value if <paramref name="t"/> is found, or -1 if it is not.
190+ /// If <paramref name="t"/> is empty, the return value is 0.
191+ /// </returns>
192+ /// <exception cref="ArgumentNullException"><paramref name="s"/> or <paramref name="t"/> is null.</exception>
193+ /// <exception cref="ArgumentOutOfRangeException">
194+ /// <paramref name="startIndex"/> is less than zero.
195+ /// </exception>
196+ public static int IndexOf ( this IEnumerable < char > s , string t , int startIndex )
197+ {
198+ return s . IndexOf ( t , startIndex , EqualityComparer < char > . Default ) ;
199+ }
200+ 201+ /// <summary>
202+ /// Reports the zero-based index of the first occurrence of the specified string in this instance
203+ /// and uses the specified <see cref="IEqualityComparer{T}"/>.
204+ /// The search starts at a specified position.
205+ /// </summary>
206+ /// <param name="s">The current collection.</param>
207+ /// <param name="t">The string to seek.</param>
208+ /// <param name="startIndex">The search starting position.</param>
209+ /// <param name="comparer">The specified <see cref="IEqualityComparer{T}"/> instance.</param>
210+ /// <returns>
211+ /// The zero-based index position of value if <paramref name="t"/> is found, or -1 if it is not.
212+ /// If <paramref name="t"/> is empty, the return value is 0.
213+ /// </returns>
214+ /// <exception cref="ArgumentNullException"><paramref name="s"/> or <paramref name="t"/> is null.</exception>
215+ /// <exception cref="ArgumentOutOfRangeException">
216+ /// <paramref name="startIndex"/> is less than zero.
217+ /// </exception>
218+ public static int IndexOf ( this IEnumerable < char > s , string t , int startIndex , IEqualityComparer < char > comparer )
219+ {
220+ Validate ( s , t , startIndex ) ;
221+ 222+ return s . IndexOf ( t . AsReadOnlyList ( ) , startIndex , comparer ) ;
223+ }
224+ 225+ #endregion
226+ 147227 #region Others
148228
149229 internal static int IndexOf < T > ( this IEnumerable < T > s , T t , int startIndex , IEqualityComparer < T > comparer )
@@ -179,7 +259,7 @@ internal static IEnumerator<T> Skip<T>(IEnumerator<T> enumerator, int count)
179259 return enumerator ;
180260 }
181261
182- internal static void Validate < T > ( IEnumerable < T > s , IReadOnlyList < T > t , int startIndex )
262+ internal static void Validate < T > ( IEnumerable < T > s , IEnumerable < T > t , int startIndex )
183263 {
184264 if ( s == null ) throw new ArgumentNullException ( nameof ( s ) ) ;
185265 if ( t == null ) throw new ArgumentNullException ( nameof ( t ) ) ;
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